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Title	Mass measurements towards doubly magic $^{78}$Ni: Hydrodynamics versus nuclear mass contribution in core-collapse supernovae
Author(s)	Giraud, S (GANIL ; Michigan State U., NSCL) ; Canete, L (Jyvaskyla U. ; Surrey U.) ; Bastin, B (GANIL) ; Kankainen, A (Jyvaskyla U.) ; Fantina, A F (GANIL) ; Gulminelli, F (LPC, Caen) ; Ascher, P (CENBG, Gradignan) ; Eronen, T (Jyvaskyla U.) ; Girard-Alcindor, V (GANIL ; IJCLab, Orsay ; Darmstadt, Tech. U.) ; Jokinen, A (Jyvaskyla U.) ; Khanam, A (Aalto U. ; Helsinki U. ; Jyvaskyla U.) ; Moore, I D (Jyvaskyla U.) ; Nesterenko, D A (Jyvaskyla U.) ; de Oliveira Santos, F (GANIL) ; Penttilä, H (Jyvaskyla U.) ; Petrone, C (Bucharest, IFIN-HH) ; Pohjalainen, I (Jyvaskyla U.) ; De Roubin, A (Jyvaskyla U.) ; Rubchenya, V A (Jyvaskyla U.) ; Vilen, M (Jyvaskyla U. ; CERN) ; Äystö, J (Jyvaskyla U.)
Publication	2022
Number of pages	6
In:	Phys. Lett. B 833 (2022) 137309
DOI	10.1016/j.physletb.2022.137309
Subject category	Nuclear Physics - Experiment
Abstract	We report the first high-precision mass measurements of the neutron-rich nuclei $^{74,75}$Ni and the clearly identified ground state of $^{76}$Cu, along with a more precise mass-excess value of $^{78}$Cu, 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 $N=50$ 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.
Copyright/License	publication: © 2022-2024 The Authors (License: CC-BY-4.0), sponsored by SCOAP³

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