arXiv : Exploring the mass surface near the rare-earth abundance peak via precision mass measurements at JYFLTRAP

Vilen, M.; Canete, L.; Kelly, J.M.; Perdomo, A. Pardo; O'Brien, J.; Eronen, T.; Kankainen, A.; Nesterenko, D.A.; Rinta-Antila, S.; Moore, I.D.; Reponen, M.; de Roubin, A.; Surman, R.; Aprahamian, A.; Penttilä, H.; Jokinen, A.; Brodeur, M.; de Groote, R.; Mumpower, M.R.

doi:10.1103/PhysRevC.101.034312

Article
Report number	arXiv:1908.05043
Title	Exploring the mass surface near the rare-earth abundance peak via precision mass measurements at JYFLTRAP
Author(s)	Vilen, M. (Jyvaskyla U.) ; Kelly, J.M. (Jyvaskyla U. ; CERN) ; Kankainen, A. (Jyvaskyla U.) ; Brodeur, M. (U. Notre Dame (main)) ; Aprahamian, A. (U. Notre Dame (main)) ; Canete, L. (Jyvaskyla U.) ; de Groote, R. (Jyvaskyla U.) ; de Roubin, A. (Jyvaskyla U.) ; Eronen, T. (Jyvaskyla U.) ; Jokinen, A. (Jyvaskyla U.) ; Moore, I.D. (Jyvaskyla U.) ; Mumpower, M.R. (Los Alamos Natl. Lab., Theor. Div.) ; Nesterenko, D.A. (Jyvaskyla U.) ; O'Brien, J. (Jyvaskyla U.) ; Perdomo, A. Pardo (U. Notre Dame (main)) ; Penttilä, H. (Jyvaskyla U.) ; Reponen, M. (Jyvaskyla U.) ; Rinta-Antila, S. (Jyvaskyla U.) ; Surman, R. (U. Notre Dame (main))
Publication	2020-03-24
Imprint	2019-08-14
Number of pages	16
In:	Phys. Rev. C 101 (2020) 034312
DOI	10.1103/PhysRevC.101.034312 (publication)
Subject category	nucl-ex ; Nuclear Physics - Experiment
Abstract	The JYFLTRAP double Penning trap at the Ion Guide Isotope Separator On-Line (IGISOL) facility has been used to measure the atomic masses of 13 neutron-rich rare-earth isotopes. Eight of the nuclides, $^{161}$Pm, $^{163}$Sm, $^{164,165}$Eu, $^{167}$Gd, and $^{165,167,168}$Tb, were measured for the first time. The systematics of the mass surface has been studied via one- and two-neutron separation energies as well as neutron pairing-gap and shell-gap energies. The proton-neutron pairing strength has also been investigated. The impact of the new mass values on the astrophysical rapid neutron capture process has been studied. The calculated abundance distribution results in a better agreement with the solar abundance pattern near the top of the rare-earth abundance peak at around $A\approx165$.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2020-2025 American Physical Society

$Experimental excitation energies of the first $2^+$ states (solid lines) together with the ratio of the first $4^+$ and $2^+$ states (dashed lines). The inset shows a peak in $2^+$ energies at $N=100$. The energies have been adopted from ENSDF \cite{ensdf} and \cite{Patel2014}.$ $The $r$-process impact factors $F$ of masses in the region of interest \cite{mumpower2015prc035807}. Mass measurements from this work are circled in red, while black circles indicate those from an earlier study at JYFLTRAP \cite{vilen2018}. In total, 22 ground-state masses and two isomeric states in this region have been measured at JYFLTRAP, of which 14 go beyond the limit of known nuclei in AME16 \cite{AME16}. For experimental AME16 values, the mass-excess uncertainties have been indicated.$ $Time-of-flight spectrum for $^{165}$Eu$^+$ using a $\unit[25-350-25]{ms}$ (On-Off-On) Ramsey-type excitation pattern. Background shading indicates the total number of ions, where darker shading indicates more ions. The red line is a fit of the lineshape to the data points (in black).$ Show more plots

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