Precision mass measurements of 67Fe and 69,70Co: Nuclear structure toward N = 40 and impact on r-process reaction rates
Abstract
Accurate mass measurements of neutron-rich iron and cobalt isotopes 67Fe and 69,70Co have been realized with the JYFLTRAP double Penning-trap mass spectrometer. With novel ion-manipulation techniques, the masses of the 69,70Co ground states and the 1/2− isomer in 69Co have been extracted for the first time. The measurements remove ambiguities in the previous mass values and yield a smoother trend on the mass surface, extending it beyond N=40. The moderate N=40 subshell gap has been found to weaken below 68Ni, a region known for shape coexistence and increased collectivity. The excitation energy for the 1/2− intruder state in 69Co has been determined for the first time and is compared to large-scale shell-model calculations. The new mass values also reduce significantly mass-related uncertainties for the astrophysical rapid neutron-capture process calculations.
Main Authors
Format
Articles
Research article
Published
2020
Series
Subjects
Publication in research information system
Publisher
American Physical Society
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202004222849Käytä tätä linkitykseen.
Review status
Peer reviewed
ISSN
2469-9985
DOI
https://doi.org/10.1103/PhysRevC.101.041304
Language
English
Published in
Physical Review C
Citation
- Canete, L., Giraud, S., Kankainen, A., Bastin, B., Nowacki, F., Poves, A., Ascher, P., Eronen, T., Alcindor, V., Jokinen, A., Khanam, A., Moore, I. D., Nesterenko, D. A., De Oliveira Santos, F., Penttilä, H., Petrone, C., Pohjalainen, I., de Roubin, A., Rubchenya, V. A., . . . Äystö, J. (2020). Precision mass measurements of 67Fe and 69,70Co: Nuclear structure toward N = 40 and impact on r-process reaction rates. Physical Review C, 101(4), Article 041304(R). https://doi.org/10.1103/PhysRevC.101.041304
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Funder(s)
European Commission
Research Council of Finland
Research Council of Finland
Research Council of Finland
Research Council of Finland
European Commission
Research Council of Finland
Research Council of Finland
Funding program(s)
Research infrastructures, H2020
Research costs of Academy Research Fellow, AoF
Research costs of Academy Research Fellow, AoF
Academy Research Fellow, AoF
Academy Research Fellow, AoF
ERC Consolidator Grant
Research costs of Academy Research Fellow, AoF
Centre of Excellence, AoF
Research infrastructures, H2020
Akatemiatutkijan tutkimuskulut, SA
Akatemiatutkijan tutkimuskulut, SA
Akatemiatutkija, SA
Akatemiatutkija, SA
ERC Consolidator Grant
Akatemiatutkijan tutkimuskulut, SA
Huippuyksikkörahoitus, SA
Additional information about funding
This work has been supported by the Academy of Finland Grant No. 284612 (the Finnish Centre of Excellence Program in Nuclear and Accelerator Based Physics Research at JYFL 2012-2017) and by the European Union’s Horizon 2020 Research and Innovation Programme Grant Agreement No. 654002 (ENSAR2). A.K. acknowledges support from the Academy of Finland under Grant No. 275389, and D.A.N. and L.C. acknowledge support under Grants No. 284516 and No. 312544. T.E. acknowledges support from the Academy of Finland under Grant No. 295207, and A.d.R. acknowledges support under Grant No. 306980. A.K. and L.C. acknowledge the funding from the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement No. 771036 (ERC CoG MAIDEN). A.P. was supported by MICIU (Spain) Grants No. SEV-2016-0597 and No. PGC2018-94583. We are grateful for the bilateral mobility Grants from the Institut Français in Finland, the Embassy of France in Finland, the French Ministry of Higher Education and Research, and the Finnish Society of Science and Letters. We are grateful for the mobility support from Projet International de Coopération Scientifique Manipulation of Ions in Traps and Ion sourCes for Atomic and Nuclear Spectroscopy (MITICANS). S.G. is grateful for the mobility Grant from the EDPSIME.
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