A1 Journal article (refereed)
Precision mass measurements of 67Fe and 69,70Co: Nuclear structure toward N = 40 and impact on r-process reaction rates (2020)

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

JYU authors or editors

Publication details

All authors or editors: Canete, L.; Giraud, S.; Kankainen, A.; Bastin, B.; Nowacki, F.; Poves, A.; Ascher, P.; Eronen, T.; Alcindor, V.; Jokinen, A.; et al.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2020

Volume: 101

Issue number: 4

Article number: 041304(R)

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.101.041304

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/68641

Additional information: See also: Erratum related to this article: Physical Review C 103, 029902 (2021); https://doi.org/10.1103/PhysRevC.103.029902


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.

Keywords: particle physics; nuclear physics

Free keywords: binding energy and masses; energy levels and level densities; nuclear astrophysics; nuclear structure and decays; r process

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Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 2

Last updated on 2022-20-09 at 14:18