Eksoottiset ytimet ja ionisuihkut (IGISOL)

IGISOL-tutkimusryhmässä tutkitaan ytimien ominaisuuksia monipuolisilla menetelmillä, kuten ioniloukuilla, hajoamis- ja laserspektroskopialla. Tutkimus tuottaa tietoa ydinten rakenteesta sekä tarjoaa olennaista dataa ydinastrofysiikan, neutriinofysiikan, perusvuorovaikutusten tutkimiseen sekä sovelluksia varten.

Perustiedot

Tutkimuksen painoala

Luonnon perusilmiöt ja matemaattinen ajattelu

Tutkimusalueet

Ydin- ja kiihdytinpohjainen fysiikka

Tiedekunta

Matemaattis-luonnontieteellinen tiedekunta

Osasto

Fysiikan laitos

Tutkimusryhmän kuvaus

Tutkimusryhmä hyödyntää ensisijaisesti IGISOL-tutkimuslaitteistoa Jyväskylän yliopiston kiihdytinlaboratoriossa, mutta olemme myös aktiivisia muissa kansainvälisissä laboratorioissa, kuten ISOLDE (CERN) ja Helmholzzentrum GSI, jonne rakentuu uusi FAIR -tutkimuskeskus. Kansainvälinen CERN- ja FAIR-laitteistoilla tapahtuva tutkimus tapahtuu tiiviissä yhteistyössä Fysiikan tutkimuslaitoksen (HIP) kanssa.

Tutkimusta tukee vahvasti Suomen Akatemia, jonka rahoittamia tutkimushankkeita on käynnissä useita. FT Mikael Reponen johtaa kokeellista osuutta projektista "Ytimien ominaisuudet N=Z linjalla (NUANZ)" (2025-2029). Se keskittyy laserspektroskopiaan, kun taas akatemiatutkija Zhuang Gen hanke "Eksoottisten N=Z-ytimien (100Sn asti) ja lähiympäristön massamittaukset ydinfysiikan ja ydinastrofysiikan tutkimuksia varten" (2023-2027) keskittyy massamittauksiin. Professori Anu Kankainen johtaa hanketta "Raskaita eksoottisia ytimiä ydinastrofysiikan tutkimukseen" (2023-2027). Vuoden 2026 alussa hän aloittaa akatemiaprofessorina projektillaan "Ytimet - aineen rakenne ja alkuperä" (2026-2031). Hän myös johtaa tutkimusryhmää uudessa Suomen Akatemian Neutronitähtifysiikan huippuyksikössä (2026-2033).

Myös EURATOM (Euratom Research and Training Programme) tukee tutkimustamme APRENDE-hankkeen "Addressing PRiorities of Evaluated Nuclear Data in Europe" (2024-2028) kautta.

Valittuja julkaisuja

IGISOL Portrait - three decades of research. The "IGISOL Portrait - three decades of research" is a collection of articles describing the research conducted using the ion guide technique at IGISOL.

Ion traps in nuclear physics—Recent results and achievements. T. Eronen, A. Kankainen, and J. Äystö, Progress in Particle and Nuclear Physics 91, 259-293 (2016). [Open Access: JYX]

Laser spectroscopy for nuclear structure physics. P. Campbell, I.D. Moore and M.R. Pearson, Progress in Particle and Nuclear Physics 86, 127-180 (2016) [Open Access: JYX]

Tutkimuksesta

Nuclear Astrophysics

Almost all chemical elements have been created via nuclear reactions in stars. The multimessenger observations, the gravitational wave event GW170817 and its electromagnetic counterparts, gave the first direct evidence that elements heavier than iron are created via the rapid neutron capture process (the r process) in a merger of two neutron stars. New fascinating observations are anticipated in coming years. In order to understand and model the r process in detail, precise data on the properties of neutron-rich nuclei, such as their masses, are required. These can be obtained with the JYFLTRAP Penning trap. Recently commissioned PI-ICR technique provides new opportunities for mass measurements of exotic nuclei at JYFLTRAP.

The properties of exotic nuclei and their reactions play also a key role in novae, type I x-ray bursts, and in the core collapse of supernovae. Our aim is to provide crucial and more reliable nuclear physics inputs for modeling these astronomical events and related nucleosynthesis. The experimental programme is mainly carried out at the IGISOL facility, and is complemented by experiments at other international radioactive ion beam facilities.

A. Kankainen et al., Physics Letters B 813, 136033 (2021). [Open Access: JYX]
Decay of the key 92-keV resonance in the 25Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter 26Al
D.A. Nesterenko et al., Physics Letters B 808, 135642 (2020). [Open Access: JYX]
Three beta-decaying states in 128In and 130In resolved for the first time using Penning-trap techniques
L. Canete et al., Physical Review C 101, 041304(R) (2020). [Open Access: JYX]
Precision mass measurements of 67Fe and 69,70Co: Nuclear structure toward N = 40 and impact on r-process reaction rates
M. Vilén et al., Physical Review C 101, 034312 (2020). [Open Access:JYX]
Exploring the mass surface near the rare-earth abundance peak via precision mass measurements at JYFLTRA
A. Kankainen et al., Hyperfine Interactions 241, 43 (2020). [Open Access: JYX]
Recent experiments at the JYFLTRAP Penning trap
O. Kirsebom et al., Physical Review Letters 123, 262701 (2019). [Open Access: JYX]
Discovery of an Exceptionally Strong β-Decay Transition of ²⁰F and Implications for the Fate of Intermediate-Mass Stars. Editor's Suggestion with a Physics Viewpoint.
C.J. Horowitz et al., Journal of Physics G: Nuclear and Particle Physics 46, 083001 (2019). [Open Access: arXiv]
r-process nucleosynthesis : connecting rare-isotope beam facilities with the cosmos
D. Kahl et al., Physics Letters B 797, 134803 (2019). [Open Access]
Single-particle shell strengths near the doubly magic nucleus ⁵⁶Ni and the ⁵⁶Ni(p,γ)⁵⁷Cu reaction rate in explosive astrophysical burning
M. Vilen, A. Kankainen et al., Physical Review C 100, 054333 (2019). [Open Access: JYX]
High-precision mass measurements and production of neutron-deficient isotopes using heavy-ion beams at IGISOL
C.V. Hampton et al., Proceedings in Physics 219, 367-372 (2019). [Open Access: JYX or arXiv]
Women Scientists Who Made Nuclear Astrophysics
L. Canete, PhD thesis, University of Jyväskylä (2019).
High precision mass measurements for nuclear astrophysics
M. Vilen, PhD thesis, University of Jyväskylä (2019).
Mass measurements and production of ions at IGISOL for the astrophysical r- and rp-processes
M. Vilen, J. M. Kelly, A. Kankainen, M. Brodeur et al., Physical Review Letters 120, 262701 (2018). [Open Access: JYX]
Precision Mass Measurements on Neutron-Rich Rare-Earth Isotopes at JYFLTRAP: Reduced Neutron Pairing and Implications for r-Process Calculations
A. Kankainen, P.J. Woods et al., Physics Letters B 769, 549 (2017). [Open Access]
Measurement of key resonance states for the ³⁰P(p,γ)³¹S reaction rate, and the production of intermediate-mass elements in nova explosions
A. Kankainen, L. Canete et al., Physical Review C 93, 041304(R) (2016). [Open Access: JYX]
Mass of astrophysically relevant ³¹Cl and the breakdown of the isobaric multiplet mass equation

Weak interaction studies

Weak interaction is one of the four known fundamental interactions of nature. It is, for example, responsible for nuclear beta decay process, where proton is transformed to neutron or vice versa in the nucleus of an atom. At the same time also a positron and a neutrino (or electron and an anti-neutrino) is emitted. The energy released in the decay is distributed between the three particles -- each time in differently, underlying the challenges in studying beta decay.

The amount of energy released in the decay (also known as the Q-value) is one of the key quantities in these studies. Recently, through advances in atomic mass spectrometry, the most precise way of measuring a Q-value is through a mass difference measurement of the decay-parent and daughters. The energy is obtained using the mass-energy equivalence formula E=mc², where E is the decay energy, m the mass difference and c the speed of light.

Decay spectroscopy with purified beams

ecay spectroscopy studies are often hampered by contaminant radioactive decays from isotopes with high production rates. At IGISOL, radioactive ion beams can be purified in several ways. The 55 degree dipole magnet is used for a rough mass separation. The JYFLTRAP Penning trap, and in future the MR-TOF multi-reflection time-of-flight mass spectrometer, can be used to select the isotope or even the isomeric state of interest for decay spectroscopy studies.

The research is done in collaboration with international research groups. Several detector arrays have utilized the ultra-pure beams provided by the facility, such as BELEN beta-delayed neutron detector, DTAS total absorption spectrometer, the TASISpec detector setup, and the University of Warsaw Ge-detector array (shown in the photo). The six germanium detectors making the base of the Ge-detector array were financed within the project ”Multidetector spectrometer of low-energy gamma photons” prepared by J. Kurpeta, A. Płochocki, T. Rza̧ca-Urban and W. Urban, granted by the Polish Ministry of Science and Higher Education in 2013 (decision no. 6341/IA/115/2013).

In 2019, the MONSTER (Modular Neutron Spectrometer) designed for the FAIR facility was successfully commissioned with 85As at IGISOL in March 2019, see the press release. Prospects for future MONSTER experiments at IGISOL look bright.

V. Guadilla et al., Phys. Rev. Lett. 122, 042502 (2019). [Open Access: JYX] Large Impact of the Decay of Niobium Isomers on the Reactor Antineutrino Summation Calculations
V. Guadilla et al., Phys. Rev. C 100, 044305 (2019). [Open Access: JYX]
Total absorption γ-ray spectroscopy of the β-delayed neutron emitters ¹³⁷I and ⁹⁵Rb.
J. Kurpeta et al., Phys. Rev. C 100, 034316 (2019). [Open Access: JYX]
First β-decay scheme of ¹⁰⁷Nb : New insight into the low-energy levels of ¹⁰⁷Mo.
Ch. Lorenz et al., Phys. Rev. C 99, 044310 (2019). [Open Access: JYX]
β decay of ¹²⁷Cd and excited states in ¹²⁷In
J. Wisniewski et al., Phys. Rev. C 100, 054331 (2019). [Open Access: JYX]
Excited states in ⁸⁷Br populated in β decay of ⁸⁷Se

Fission studies

Charged particle induced fission has since 1980's utilised at IGISOL to produce neutron rich nuclei for spectroscopy. Since the ions extracted from the ion guide are primary fission products, and ions of any element can be extracted within tens of milliseconds, the technique is suitable for fission product yield distribution measurements, allowing studies of the fission process itself. Identification of the fission products on the basis of their mass with JYFLTRAP further enhances the FY measurements. In addition to charged particle induced fission, neutron induced fission can be studied utilising a recently build neutron converter.

V. Rakopoulos et al., Physical Review C 99, 014617 (2019). [Open Access: JYX].
Isomeric fission yield ratios for odd-mass Cd and In isotopes using the phase-imaging ion-cyclotron-resonance technique
A. Mattera et al. European Physical Journal A 54, 33 (2018). [Open Access: JYX].
Production of Sn and Sb isotopes in high-energy neutron-induced fission of ^natU
V. Rakopoulos et al., Physical Review C 98, 024612 (2018). [Open Access: JYX].
First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments
H. Penttilä, et al., Eur. Phys. J. A 48,43 (2012). [Open Access: link] Fission yield studies at the IGISOL facility
D. Gorelov, et al., Nuclear Instruments and Methods B 376, 46 - 51 (2016). [Open Access: JYX]
Developments for neutron-induced fission at IGISOL–4
A. Mattera, et al., Eur. Phys. J. A 53, 173. (2017). [Open Access: JYX]
A neutron source for IGISOL-JYFLTRAP: Design and characterisation

Optical spectroscopy

The structure and properties of atomic nuclei can be measured using many different techniques. One important class of techniques uses lasers to probe the energy levels of the electrons which are bound to the nucleus, in order to access the electromagnetic nuclear moments, the nuclear spin, and the changes in the size of the nucleus. These observables provide unique insight into the configuration of atomic nuclei, the purity of their wavefunctions, their shape and deformation and their nuclear sizes. Thus, they are exceptionally potent tests for nuclear models.

Optical spectroscopy techniques yield very precise values for these nuclear observables and can be applied even to short-lived isotopes produced with relatively low production rates. At the IGISOL laboratory, we currently have three experimental laser spectroscopy stations which offer a different compromise between experimental efficiency and resolution.

In addition to these spectroscopy experiments, we also house two experiments which rely on lasers to manipulate the properties of atoms or ions placed inside of traps. The aim of these projects is to look for physics beyond the standard model through precision beta-decay studies (MORA), and to realize the first experimental demonstration of gamma-ray coherent emission by means of super-radiance in a Bose-Einstein condensate of 135mCs isomers (GAMMALAS).

The collinear laser spectroscopy technique provides high resolution measurements of the nuclear size and electromagnetic moments. This method relies on the excitation of electrons of an isotope from the energy levels of a low-lying hyperfine manifold to those of an excited state using continuous wave lasers, followed by detection of the subsequent de-excitation. This is achieved by counting the fluorescence emitted by the atoms, using a photomultiplier tube. The energy difference between the hyperfine levels is sensitive to the nuclear properties and thus allows for their precise measurement. The high experimental resolution is achieved by performing the experiment in a collinear geometry, meaning that the ion beam and the laser beam are propagating along the same axis. Because the ion beam is accelerated to a high velocity (beam energy of 30 keV), Doppler broadening effects are thus suppressed.

The measured nuclear properties can be used to test our understanding of the nuclear many-body problem. As the nuclear magnetic moment probes the single particle nature of the nucleus while the quadrupole moment is related to the collective behavior, these properties combined provide crucial information about the complex interactions between the protons and neutrons inside the atomic nucleus. In addition to the electromagnetic moments, the changes in the nuclear charge radius of the radioactive isotopes with respect to the stable isotope can also be extracted from the laser spectroscopy measurements. This gives access to the variation of the nuclear charge distribution along an isotopic chain and provides information on both the bulk properties of nuclear matter and the details of nucleon-nucleon interactions.

Operating at the intersection of nuclear and atomic physics, this technique can also be used for the measurement of the atomic properties such as the hyperfine parameters or the atomic field and mass shift constants.

The RAPTOR project - RIS And Purification Traps for Optimised spectRoscopy

The RAPTOR project was initiated to provide a more efficient variant of collinear laser spectroscopy, though with a trade-off some in terms of the high precision of that method. The beamline is currently (2021) under commissioning; first results are expected in the coming months.

The RAPTOR beamline is designed to accept ion beams with a variable beam energy between 1 and 10 keV. This means that the Doppler broadening is suppressed less as compared to standard collinear laser spectroscopy, but gives the device a small footprint and provides longer interaction times between the atoms and the lasers. Rather than monitoring the excitation of the atoms via the detection of their spontaneous decay, instead a step-wise laser ionization process is used. Thus, more efficient charged-particle detection can be employed. The device is thus particularly well suited to the study of isotopes produced at very low rates and/or with very short lifetimes, but where the highest precision is not required to extract nuclear information.

The fact that atoms are laser ionized inside the RAPTOR beamline means they can then be further manipulated, for example to perform an additional purification. The lab has therefore also developed the capability of injecting ions from the RAPTOR beamline directly into the double-Penning trap mass spectrometer. Thus, ultra-low background hyperfine spectra can be obtained, free from any contribution of isobaric beam contamination.

The long interaction times offered by the use of slower beams also makes it possible to perform laser-radiofrequency double resonance spectroscopy, which offers superior precision on hyperfine constants of the atomic ground state, but provides no information on the excited atomic states. Thus, it is an ideal tool to measure higher-order nuclear moments or hyperfine anomalies, but is not sensitive to changes in the nuclear charge radius.

This project was funded by the Marie Skłodowska-Curie grant agreement No 844829.

IGISOL -laitteisto

The IGISOL (Ion Guide Isotope Separation On-Line) mass separator is the heart of the research infrastructure of the Exotic Nuclei and Beams -group. The facility is located in the newer part of the JYFL Accelerator Laboratory built around 10 years ago. IGISOL produces a broad range of low-energy (30 keV) radioactive and stable ion beams for studies of atomic nuclei and their properties.

Ion guides

The radioactive ions are produced with different kinds of techniques at the IGISOL (Ion Guide Isotope Separator On-Line) facility. We do active research and development work related to the ion guide method, gas cells and related production techniques.

The IGISOL method is fast, sub-ms technique for producing low-energy radioactive ion beams. It was developed in Jyväskylä in early 1980s. The IGISOL technique is chemically insensitive, and thus makes it possible to produce radioactive beams of all elements, including refractory elements usually difficult to produce at ISOL facilities. The basic idea, stopping of ions in gas with a swift extraction of radioactive ion beams, has been adopted in many major accelerator facilities worldwide over the years.

For example the following ion guides or ion sources have been used or developed at IGISOL:

Light-ion ion guide for fusion-evaporation reactions with p or d beams
Heavy-ion ion guide HIGISOL for heavy ion fusion-evaporation reactions
Fission ion guide for proton- or deuteron-induced fission
Fission ion guide designed for neutron-induced fission
Ion guide for multinucleon-transfer reactions
Hot cavity laser ion source
Off-line ion source station for stable ion beams

References to main publications describing the technique
The IGISOL technique—three decades of developments
Hyperfine Interactions 223, 17 (2014). [Open Access: link ]
I. D. Moore, P. Dendooven, J. Ärje
Production of neutron deficient rare isotope beams at IGISOL; on-line and off-line studies
Nuclear Instruments and Methods in Physics Research B 222 (2004) 632
J. Huikari et al.
Development and applications of the IGISOL technique
Nuclear Physics A 693 (2001) 477–494
J. Äystö
An inductively heated hot cavity catcher laser ion source
Review of Scientific Instruments 86, 123501 (2015)
M. Reponen et al.
Developments for neutron-induced fission at IGISOL-4
Nuclear Instruments and Methods in Physics Research B 376, 46 (2016).
[Open Access: JYX]
D. Gorelov et al.
Simulations of the fission-product stopping efficiency in IGISOL
European Physical Journal A 51, 59 (2015). [Open Access: JYX]
A. Al-Adili et al.
A new off-line ion source facility at IGISOL
Nuclear Instruments and Methods in Physics Research Section A 263, 382-383 (2020).
[Open Access: arXiv]
M. Vilen et al.

Radio-Frequency Quadrupole (RFQ) Cooler and Buncher

The RFQ cooler and buncher cools the ions and converts the continuous radioactive ion beam into narrow ion bunches. The ejected bunches are further used in different kinds of ion trapping and laser spectroscopy experiments. The RFQ cooler and buncher was developed and commissioned at IGISOL already in early 2000s. Details can be found from:

A. Nieminen et al., Nucl. Instrum. Meth. Phys. Res. A 469 (2001) 244
Beam cooler for low-energy radioactive ions
A. Nieminen et al., Phys. Rev. Lett. 88 (2002) 094801
On-Line Ion Cooling and Bunching for Collinear Laser Spectroscopy

JYFLTRAP Double Penning Trap Mass Spectrometer

JYFLTRAP is a cylindrical double Penning trap mass spectrometer at IGISOL. It is located inside a 7 T superconducting solenoid.

Details of the trap and used measurement methods can be found from:

JYFLTRAP: a Penning trap for precision mass spectroscopy and isobaric purification
T. Eronen et al., European Physical Journal A 48, 46 (2012). [Open Access: JYX].

Phase-Imaging Ion-Cyclotron-Resonance technique at the JYFLTRAP double Penning trap mass spectrometer
D.A. Nesterenko et al., European Physical Journal A 54, 154 (2018). [Open Access: JYX]

Study of radial motion phase advance during motion excitations in a Penning trap and accuracy of JYFLTRAP mass spectrometer
D.A. Nesterenko et al., European Physical Journal A 57, 302 (2021). Open Access.

Ajankohtaista

Hankkeet

Jäsenet

Tutkimusryhmä

Tutkimusryhmän vetäjät

Ari Jokinen

Professori

Jäsenet

Tutkimusinsinööri, dosentti

Wirunchana Rattanasakuldilok

Luis Motilla Martinez

Väitöskirjatutkija

Ulkoiset jäsenet

Saikumar Chinthakayala

Doctoral researcher

University of Jyväskylä & University of Caen

Julkaisut

Julkaisu

2017

Total absorption studies of high priority decays for reactor applications: 86Br and 91Rb

International conference on nuclear data for science and technology. EPJ Web of Conferences. EDP Sciences.

Algora, A.

Rice, S.

Guadilla, V.

Tain, J.L.

Valencia, E.

Zakari-Issoufou, A.-A.

Agramunt, J.

Äystö, Juha

Batist, L.

Briz, J.A.

Bowry, M.

Bui, V.M.

Caballero-Folch, R.

Cano-Ott, D.

Cucoanes, A.

Eronen, Tommi

Elomaa, Viki-Veikko

Estevez, E.

Estienne, M.

Fallot, M.

Farrelly, G.F.

Fraile, L.M.

Fleming, M.

Ganioglu, E.

Garcia, A.R.

Gelletly1, W.

Gómez-Hornillos, B.

Gorelov, D.

Gorlychev, V.

Hakala, Jani

Jokinen, Ari

Jordan, D.

Kankainen, Anu

Kolhinen, Veli

Kondev, F.G.

Koponen, Jukka

Lebois, M.

Martinez, T.

Mason, P.

Mendoza, E.

Monserrate, M.

Montaner-Pizá, A.

Moore, Iain

Nácher, E.

Orrigo, S.E.A.

Penttilä, Heikki

Podolyák, Z.

Pohjalainen, Ilkka

Porta, A.

Regan, P.H.

Reinikainen, Juuso

Reponen, Mikael

Rinta-Antila, Sami

Rissanen, Juho

Rubio, B.

Rytkönen, Kari

Shiba, T.

Sonnenschein, Volker

Sonzogni, A.A.

Sublet, J.-Ch.

Vedia, V.

Voss, Annika

Wilson, J.N.

Julkaisu

2017

Total absorption γ-ray spectroscopy of the β-delayed neutron emitters 87Br, 88Br, and 94Rb

Physical Review C.

Valencia, E.

Tain, J. L.

Algora, A.

Agramunt, J.

Estevez, E.

Jordan, M. D.

Rubio, B.

Rice, S.

Regan, P.

Gelletly, W.

Podolyák, Z.

Bowry, M.

Mason, P.

Farrelly, G. F.

Zakari-Issoufou, A.

Fallot, M.

Porta, A.

Bui, V. M.

Rissanen, Juho

Eronen, Tommi

Moore, Iain

Penttilä, Heikki

Äystö, Juha

Elomaa, Viki-Veikko

Hakala, Jani

Jokinen, Ari

Kolhinen, Veli

Reponen, Mikael

Sonnenschein, Volker

Cano-Ott, D.

Garcia, A. R.

Martínez, T.

Mendoza, E.

Caballero-Folch, R.

Gomez-Hornillos, B.

Gorlichev, V.

Kondev, F. G.

Sonzogni, A. A.

Batist, L.

Julkaisu

2017

Towards 14C-free liquid scintillator

International Conference on Neutrino Physics and Astrophysics. Journal of Physics: Conference Series. Institute of Physics Publishing.

Enqvist, T.

Barabanov, I. R.

Bezrukov, L. B.

Gangapshev, A. M.

Gavrilyuk, Y. M.

Grishina, V. Yu.

Gurentsov, V. I.

Hissa, J.

Joutsenvaara, J.

Kazalov, V. V.

Krokhaleva, S.

Kutuniva, J.

Kuusiniemi, P.

Kuzminov, V. V.

Kurlovich, A. S.

Loo, Kai

Lubsandorzhiev, B. K.

Lubsandorzhiev, S.

Morgalyuk, V. P.

Novikova, G. Y.

Pshukov, A. M.

Sinev, V. V.

Slupecki, Maciej

Trzaska, Wladyslaw

Umerov, Sh. I.

Veresnikova, A. V.

Virkajarvi, A.

Yanovich, Y. A.

Zavarzina, V. P.

Julkaisu

2017

Towards an Experimental Determination of the Transition Strength Between the Ground States of 20F and 20Ne

Nuclei in the Cosmos. JPS Conference Proceedings. Physical Society of Japan.

Kirsebom, Oliver S.

Cederkäll, Joakim

Jenkins, David G.

Joshi, Pankaj

Julin, Rauno

Kankainen, Anu

Kibédi, Tibor

Tengblad, Olof

Trzaska, Wladyslaw

Julkaisu

2017

Towards high-resolution laser ionization spectroscopy of the heaviest elements in supersonic gas jet expansion

Nature Communications.

Ferrer, R.

Barzakh, A.

Bastin, B.

Beerwerth, R.

Block, M.

Creemers, P.

Grawe, H.

Groote, R. de

Delahaye, P.

Fléchard, X.

Franchoo, S.

Fritzsche, S.

Gaffney, L. P.

Ghys, L.

Gins, W.

Granados, C.

Heinke, R.

Hijazi, L.

Huyse, M.

Kron, T.

Kudryavtsev, Yu.

Laatiaoui, M.

Lecesne, N.

Loiselet, M.

Lutton, F.

Moore, Iain

Martínez, Y.

Mogilevskiy, E.

Naubereit, P.

Piot, J.

Raeder, S.

Rothe, S.

Savajols, H.

Sels, S.

Sonnenschein, Volker

Thomas, J-C

Traykov, E.

Beveren, C. Van

Bergh, P. Van den

Van Duppen, P.

Wendt, K.

Zadvornaya, A.

Julkaisu

2017

Twin GEM-TPC prototype (HGB4) beam test at GSI and Jyväskylä : a development for the super-FRS at FAIR

IEEE Nuclear Science Symposium and Medical Imaging Conference. IEEE Nuclear Science Symposium and Medical Imaging Conference record.

García, F.

Turpeinen, R.

Äystö, J.

Grahn, Tuomas

Rinta-Antila, Sami

Jokinen, Ari

Kunkel, J.

Kleipa, V.

Gromliuk, A.

Risch, H.

Caesar, C.

Simons, C.

Schmidt, C. J.

Prochazka, A.

Hoffmann, J.

Rusanov, I.

Kurz, N.

Heggen, H.

Strmen, P.

Pikna, M.

Sitar, B.

Julkaisu

2017

Ydinfysiikkaa, jotta ymmärtäisimme miten alkuaineet ovat syntyneet tähdissä

Tiedeblogi.

Kankainen, Anu

Julkaisu

2016

Angle-integrated measurements of the 26Al (d, n)27Si reaction cross section: a probe of spectroscopic factors and astrophysical resonance strengths

European Physical Journal A.

Kankainen, Anu

Woods, P. J.

Nunes, F.

Langer, C.

Schatz, H.

Bader, V.

Baugher, T.

Bazin, D.

Brown, B. A.

Browne, J.

Doherty, D. T.

Estrade, A.

Gade, A.

Kontos, A.

Lotay, G.

Meisel, Z.

Montes, F.

Noji, S.

Perdikakis, G.

Pereira, J.

Recchia, F.

Redpath, T.

Stroberg, R.

Scott, M.

Seweryniak, D.

Stevens, J.

Weisshaar, D.

Wimmer, K.

Zegers, R.

Julkaisu

2016

Beta-decay of 31Cl: an indirect probe of the 30P(p,γ)31S reaction. Present status and future perspectives

European Physical Journal Plus.

Saastamoinen, Antti

Kankainen, Anu

Trache, Livius

Julkaisu

2016

Changes in nuclear structure along the Mn isotopic chain studied via charge radii

Physical Review C.

Heylen, H.

Babcock, C.

Beerwerth, R.

Billowes, J.

Bissell, M. L.

Blaum, K.

Bonnard, J.

Campbell, P.

Cheal, B.

Goodacre, T. Day

Fedorov, D.

Fritzsche, S.

Ruiz, R. F. Garcia

Geithner, W.

Geppert, Ch.

Gins, W.

Grob, L. K.

Kowalska, M.

Kreim, K.

Lenzi, S. M.

Moore, Iain

Maass, B.

Malbrunot-Ettenauer, S.

Marsh, B.

Neugart, R.

Neyens, G.

Nörtershäuser, W.

Otsuka, T.

Papuga, J.

Rossel, R.

Rothe, S.

Sánchez, R.

Tsunoda, Y.

Wraith, C.

Xie, L.

Yang, X. F.

Yordanov, D. T.

Julkaisu

2016

Characterization of a neutron–beta counting system with beta-delayed neutron emitters

Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment.

Agramunt, J.

Tain, J.L.

Gómez-Hornillos, M.B.

Garcia, A.R.

Albiol, F.

Algora, A.

Caballero-Folch, R.

Calviño, F.

Cano-Ott, D.

Cortés, G.

Domingo-Pardo, C.

Eronen, Tommi

Gelletly, W.

Gorelov, Dmitry

Gorlychev, V.

Hakala, Jani

Jokinen, Ari

Jordan, M.D.

Kankainen, Anu

Kolhinen, Veli

Kucuk, L.

Martinez, T.

Mason, P.J.R.

Moore, Iain

Penttilä, Heikki

Podolyák, Zs.

Pretel, C.

Reponen, Mikael

Riego, A.

Rissanen, Juho

Rubio, B.

Saastamoinen, Antti

Tarifeño-Saldivia, A.

Valencia, E.

Julkaisu

2016

Development of a low-energy radioactive ion beam facility for the MARA separator

Hyperfine Interactions.

Papadakis, Philippos

Moore, Iain

Pohjalainen, Ilkka

Sarén, Jan

Uusitalo, Juha

Uutisia

Avoimia tutkijatohtorin paikkoja!
- Postdoctoral Researcher in Experimental Nuclear Astrophysics (Haku päättyy 4.2.2026)
- Postdoctoral Researcher in Nuclear Astrophysics (Haku päättyy 4.2.2026)
- Postdoctoral Researcher in Experimental Nuclear Physics (Haku päättyy 4.2.2026)
Anu Kankainen valittiin akatemiaprofessoriksi (22.12.2025)
Jyväskylän yliopisto mukana läpimurrossa: atomiytimen magneettisuus mitattu uudella tavalla (9.12.2025)
Ionien kierrätys avaa tien raskaimpien alkuaineiden tutkimukseen (27.11.2025)
Neutronitähtifysiikan huippuyksikkö valittiin Suomen Akatemian huippuyksiköksi 2026-2033 (29.10.2025)
Väitös: Radioaktiivisten ionien tutkimukseen kehitetyllä laitteistolla läpimurto eksoottisten ytimien tutkimuksessa (Virtanen 15.10.2025)
Väitös: Kiihdytinlaboratoriossa tehdyt huipputarkat mittaukset paljastavat ydinhajoamisten energiat (Ruotsalainen 10.10.2025)
Väitös: Uusi laserspektroskopialaitteisto vahvistaa Jyväskylän yliopiston ydinfysiikan tutkimusta (Kujanpää 26.9.2025)
NUANZ-hankkeelle rahoitus Suomen Akatemialta (16.6.2025)
Väitös: Experimental insights from the mass measurement of neutron-rich rare-earth isotopes (Jaries 5.6.2025)
Tutkijat ovat askeleen lähempänä antineutriinon massan ymmärtämistä (6.5.2025)
Väitös: Advancing laser and decay spectroscopy for actinide ion beam production (Raggio 28.3.2025)
Uudet mittaukset paljastivat kiinnostavan piirteen radioaktiivisissa lantaani-isotoopeissa (31.1.2025)

Eksoottiset ytimet ja ionisuihkut (IGISOL)

Tutkimusryhmän kuvaus

Valittuja julkaisuja

Tutkimuksesta

Nuclear Astrophysics

Weak interaction studies

Decay spectroscopy with purified beams

Fission studies

Optical spectroscopy

The RAPTOR project - RIS And Purification Traps for Optimised spectRoscopy

IGISOL -laitteisto

Ion guides

Radio-Frequency Quadrupole (RFQ) Cooler and Buncher

JYFLTRAP Double Penning Trap Mass Spectrometer

ERC CoG Project MAIDEN

Heavy Exotic Nuclei for Nuclear Astrophysics

Mass measurements of exotic N=Z nuclei (up to 100Sn) and the vicinity for nuclear physics and nuclear astrophysics studies (MASSPASS)

From neutrino mass ordering to developing liquid scintillators for new applications

Tutkimusryhmä

Tutkimusryhmän vetäjät

Jäsenet

Ulkoiset jäsenet

Saikumar Chinthakayala

Julkaisut

Total absorption studies of high priority decays for reactor applications: 86Br and 91Rb

Total absorption γ-ray spectroscopy of the β-delayed neutron emitters 87Br, 88Br, and 94Rb

Towards 14C-free liquid scintillator

Towards an Experimental Determination of the Transition Strength Between the Ground States of 20F and 20Ne

Towards high-resolution laser ionization spectroscopy of the heaviest elements in supersonic gas jet expansion

Twin GEM-TPC prototype (HGB4) beam test at GSI and Jyväskylä : a development for the super-FRS at FAIR

Ydinfysiikkaa, jotta ymmärtäisimme miten alkuaineet ovat syntyneet tähdissä

Angle-integrated measurements of the 26Al (d, n)27Si reaction cross section: a probe of spectroscopic factors and astrophysical resonance strengths

Beta-decay of 31Cl: an indirect probe of the 30P(p,γ)31S reaction. Present status and future perspectives

Changes in nuclear structure along the Mn isotopic chain studied via charge radii

Characterization of a neutron–beta counting system with beta-delayed neutron emitters

Development of a low-energy radioactive ion beam facility for the MARA separator

Uutisia

Eksoottiset ytimet ja ionisuihkut (IGISOL)

Tutkimusryhmän kuvaus

Valittuja julkaisuja

Tutkimuksesta

Nuclear Astrophysics

Selected publications

Weak interaction studies

Decay spectroscopy with purified beams

Selected publications

Fission studies

Selected publications

Optical spectroscopy

Collinear laser spectroscopy

IGISOL -laitteisto

Ion guides

Radio-Frequency Quadrupole (RFQ) Cooler and Buncher

JYFLTRAP Double Penning Trap Mass Spectrometer

Hankkeet

ERC CoG Project MAIDEN

Heavy Exotic Nuclei for Nuclear Astrophysics

Mass measurements of exotic N=Z nuclei (up to 100Sn) and the vicinity for nuclear physics and nuclear astrophysics studies (MASSPASS)

From neutrino mass ordering to developing liquid scintillators for new applications

Tutkimusryhmä

Tutkimusryhmän vetäjät

Jäsenet

Ulkoiset jäsenet

Saikumar Chinthakayala

Julkaisut

Uutisia