Mass measurements of neutron-rich A≈90 nuclei constrain element abundances
Xian, W., Chen, S., Nikas, S., Rosenbusch, M., Wada, M., Ishiyama, H., Hou, D., Iimura, S., Nishimura, S., Schury, P., Takamine, A., Yan, S., Browne, F., Doornenbal, P., Flavigny, F., Hirayama, Y., Ito, Y., Kimura, S., Kojima T., M., . . . Wollnik, H. (2024). Mass measurements of neutron-rich A≈90 nuclei constrain element abundances. Physical Review C, 109(3), Article 035804. https://doi.org/10.1103/PhysRevC.109.035804
Julkaistu sarjassa
Physical Review CPäivämäärä
2024Tekijänoikeudet
© 2024 American Physical Society
Atomic masses of the neutron-rich isotopes 83,84Ga, 82–86Ge, 82–89As, 82,84–91Se, 85,86,89–92Br, 89,91,92Kr, and 91Rb have been measured with high precision and accuracy using the multi-reflection time-of-flight mass spectrograph at the RIBF facility. The masses of 88,89As were measured for the first time and the mass uncertainties of 86Ge and 90,91Se were significantly reduced from several hundred keV to below the 10 keV scale. Investigation of shell evolution and potential subshell closures are proceeded by analysis of two-neutron separation energy systematics. As a result of the precise mass measurements, no prominent change on the slope of the two-neutron separation energy beyond N=56 is observed in Se isotopes, indicating the subshell closure effect at N=56 of Se does not exist. Also, various leading mass models are compared with the measurements. The impact of the more precisely known data on r-process nucleosynthesis calculations is investigated in light of these new mass measurements, showing a remarkable reduction of reaction-rate uncertainties.
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Julkaisija
American Physical Society (APS)ISSN Hae Julkaisufoorumista
2469-9985Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/213556781
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Euroopan komissioRahoitusohjelmat(t)
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
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We appreciate the support from the Japan Society for the Promotion of Science KAKENHI (Grants No. 2200823, No. 24224008, No. 24740142, No. 15H02096, No. 15K05116, No. 17H01081, No. 17H06090, No. 18K13573, No. 18H05462, No. 19H00679, No. 19H05145, No. 19K14750, No. 20H05648, No. 21H00117, No. 21K13951, No. 22H01257, and No. 22H04946), the RIKEN Junior Research Associate Program, the RIKEN program for Evolution of Matter in the Universe (r-EMU), NSFC Excellent Young Scientists Fund (No. 12122516), and Research Grants Council (RGC) of Hong Kong with a grant of General Research Funding (GRF-17312522). V.W. acknowledges support from the German BMBF (Grants No. 05P21RDFN1 and No. 05P21RDFN9). S.N. would like to acknowledge funding from the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 771036 (ERC CoG MAIDEN) and CSC - IT Center for Science, Finland, for computational resources. ...Lisenssi
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