Mass measurements towards doubly magic 78Ni: Hydrodynamics versus nuclear mass contribution in core-collapse supernovae

Simon Giraud, Laetitia Canete, Beyhan Bastin, Anu Kankainen*, A.F. Fantina, F. Gulminelli, Pauline Ascher, Tommi Eronen, V. Girard Alcindor, Ari Jokinen, Afrina Khanam, Iain D. Moore, D.A. Nesterenko, F. De Oliveira Santos, Heikki Penttilä, C. Petrone, I. Pohjalainen, Antoine de Roubin, V. A. Rubchenya, Markus VilenJuha Äystö

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

We report the first high-precision mass measurements of the neutron-rich nuclei 74,75Ni and the clearly identified ground state of 76Cu, along with a more precise mass-excess value of 78Cu, performed with the double Penning trap JYFLTRAP at the Ion Guide Isotope Separator On-Line (IGISOL) facility. These new results lead to a quantitative estimation of the quenching for the neutron shell gap. The impact of this shell quenching on core-collapse supernova dynamics is specifically tested using a dedicated statistical equilibrium approach that allows a variation of the mass model independent of the other microphysical inputs. We conclude that the impact of nuclear masses is strong when implemented using a fixed trajectory as in the previous studies, but the effect is substantially reduced when implemented self-consistently in the simulation.
Original languageEnglish
Article number137309
Pages (from-to)1-6
Number of pages6
JournalPhysics Letters B
Volume833
DOIs
Publication statusPublished - 16 Jul 2022
MoE publication typeA1 Journal article-refereed

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