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

• Published in: arXiv.org 2019-11
• Main Authors: Vilen, M, Kelly, J M, Kankainen, A, Brodeur, M, Aprahamian, A, Canete, L, de Groote, R, de Roubin, A, Eronen, T, Jokinen, A, Moore, I D, Mumpower, M R, Nesterenko, D A, O'Brien, J, A Pardo Perdomo, Penttilä, H, Reponen, M, Rinta-Antila, S, Surman, R
• Format: Article
• Language: English
• Subjects: Abundance; Earth surface; Gadolinium; Nuclear capture; Nuclides; Rare earth elements; Separators
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1908.05043

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 \(A\approx165\).