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Report number	arXiv:2401.07976
Title	High-Precision Mass Measurements of Neutron Deficient Silver Isotopes Probe the Robustness of the $N=50$ Shell Closure
Author(s)	Ge, Zhuang (Jyvaskyla U.) ; Reponen, Mikael (Jyvaskyla U.) ; Eronen, Tommi (Jyvaskyla U.) ; Hu, Baishan (TRIUMF ; ORNL, Oak Ridge (main) ; Oak Ridge) ; Kortelainen, Markus (Jyvaskyla U.) ; Kankainen, Anu (Jyvaskyla U.) ; Moore, Iain (Jyvaskyla U.) ; Nesterenko, Dmitrii (Jyvaskyla U.) ; Yuan, Cenxi (SYSU, Guangzhou) ; Beliuskina, Olga (Jyvaskyla U.) ; Cañete, Laetitia (Jyvaskyla U.) ; de Groote, Ruben (Jyvaskyla U. ; Leuven U.) ; Delafosse, Celement (Jyvaskyla U. ; CENBG, Gradignan) ; Delahaye, Pierre (GANIL) ; Dickel, Timo (Darmstadt, GSI ; U. Giessen, II. Phys. Inst.) ; de Roubin, Antoine (Jyvaskyla U.) ; Geldhof, Sarina (Jyvaskyla U.) ; Gins, Wouter (Jyvaskyla U.) ; Holt, Jason D. (TRIUMF ; McGill U.) ; Hukkanen, Marjut (Jyvaskyla U. ; CENBG, Gradignan) ; Jaries, Arthur (Jyvaskyla U.) ; Jokinen, Ari (Jyvaskyla U.) ; Koszorús, Ágota (Liverpool U. ; CERN ; Leuven U.) ; Kripkó-Koncz, Gabriella (U. Giessen, II. Phys. Inst.) ; Kujanpää, Sonja (Jyvaskyla U.) ; Lam, Yi Hua ; Lam, Yihua (Lanzhou, Inst. Modern Phys.) ; Nikas, Stylianos (Jyvaskyla U.) ; Ortiz-Cortes, Alejandro (Jyvaskyla U.) ; Penttilä, Heikki (Jyvaskyla U.) ; Pitman-Weymouth, Daniel (Jyvaskyla U.) ; Plaß, Wolfgang (Darmstadt, GSI ; U. Giessen, II. Phys. Inst.) ; Pohjalainen, Ilkka ; Raggio, Andrea (Jyvaskyla U.) ; Rinta-Antila, Sami (Jyvaskyla U.) ; Romero, Jorge (Jyvaskyla U. ; Liverpool U.) ; Stryjczyk, Marek (Jyvaskyla U.) ; Vilen, Markus (Jyvaskyla U.) ; Virtanen, Ville (Jyvaskyla U.) ; Zadvornaya, Alexandra (Jyvaskyla U.)
Publication	2024-09-26
Imprint	2024-01-15
Number of pages	9
Note	9 pages, 3 figures
In:	Phys. Rev. Lett. 133 (2024) 132503
DOI	10.1103/PhysRevLett.133.132503 (publication)
Subject category	nucl-th ; Nuclear Physics - Theory ; nucl-ex ; Nuclear Physics - Experiment
Abstract	High-precision mass measurements of exotic $^{95-97}$Ag isotopes close to the $N = Z$ line have been conducted with the JYFLTRAP double Penning trap mass spectrometer, with the silver ions produced using the recently commissioned inductively-heated hot cavity catcher laser ion source at the Ion Guide Isotope Separator On-Line facility. The atomic mass of $^{95}$Ag was directly determined for the first time. In addition, the atomic masses of $\beta$-decaying 2$^+$ and 8$^+$ states in $^{96}$Ag have been identified and measured for the first time, and the precision of the $^{97}$Ag mass has been improved. The newly measured masses, with a precision of $\approx$ 1 keV/c$^2$, have been used to investigate the $N =$ 50 neutron shell closure confirming it to be robust. Empirical shell-gap and pairing energies determined with the new ground-state mass data are compared with the state-of-the-art \textit{ab initio} calculations with various chiral effective field theory Hamiltonians. The precise determination of the excitation energy of the $^{96m}$Ag isomer in particular serves as a benchmark for \textit{ab initio} predictions of nuclear properties beyond the ground state, specifically for odd-odd nuclei situated in proximity to the proton dripline below $^{100}$Sn. In addition, density functional theory (DFT) calculations and configuration-interaction shell-model (CISM) calculations are compared with the experimental results. All theoretical approaches face challenges to reproduce the trend of nuclear ground-state properties in the silver isotopic chain across the $N =$50 neutron shell and toward the proton drip-line.
Copyright/License	preprint: (License: CC BY 4.0) publication: © 2024 American Physical Society

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