Precision Mass Measurements on Neutron-Rich Rare-Earth Isotopes at JYFLTRAP: Reduced Neutron Pairing and Implications for r-Process Calculations

被引：54

作者：

Vilen, M. ^{[1
]}

Kelly, J. M. ^{[2
]}

Kankainen, A. ^{[1
]}

Brodeur, M. ^{[2
]}

Aprahamian, A. ^{[2
]}

Canete, L. ^{[1
]}

Eronen, T. ^{[1
]}

Jokinen, A. ^{[1
]}

Kuta, T. ^{[1
,2
]}

Moore, I. D. ^{[1
]}

Mumpower, M. R. ^{[2
,3
]}

Nesterenko, D. A. ^{[1
]}

Penttila, H. ^{[1
]}

Pohjalainen, I. ^{[1
]}

Porter, W. S. ^{[2
]}

Rinta-Antila, S. ^{[1
]}

Surman, R. ^{[2
]}

Voss, A. ^{[1
]}

Aysto, J. ^{[1
]}

机构：

[1] Univ Jyvaskyla, POB 35, FI-40014 Univ Jyvaskyla, Finland

[2] Univ Notre Dame, Notre Dame, IN 46556 USA

[3] Los Alamos Natl Lab, Theory Div, Los Alamos, NM 87544 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 26期

基金：

美国国家科学基金会; 芬兰科学院;

关键词：

PENNING TRAPS; MAGIC NUMBERS; RAMSEY METHOD; STAR MERGERS; NUCLEOSYNTHESIS; SPECTROMETRY; STABILITY; NUCLEI;

D O I：

10.1103/PhysRevLett.120.262701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The rare-earth peak in the r-process abundance pattern depends sensitively on both the astrophysical conditions and subtle changes in nuclear structure in the region. This work takes an important step towards elucidating the nuclear structure and reducing the uncertainties in r-process calculations via precise atomic mass measurements at the JYFLTRAP double Penning trap. Nd-158, Pm-160, Sm-162, and Gd164-166 have been measured for the first time, and the precisions for Nd-156, Pm-158, Eu-162,Eu-163, Gd-163, and Tb-164 have been improved considerably. Nuclear structure has been probed via two-neutron separation energies S-2n and neutron pairing energy metrics D-n. The data do not support the existence of a subshell closure at N = 100. Neutron pairing has been found to be weaker than predicted by theoretical mass models. The impact on the calculated r-process abundances has been studied. Substantial changes resulting in a smoother abundance distribution and a better agreement with the solar r-process abundances are observed.

引用

页数：7

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