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. et al. (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), 041304(R). DOI: 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

Open Access: Publication channel is not openly available

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


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.


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

Preliminary JUFO rating: 2


Last updated on 2021-09-02 at 10:14