@Article{Chen+Montaner-Piza2019,
author="Chen, Z. Q. et al
and Montaner-Piza, A.",
title="Proton Shell Evolution below Sn-132: First Measurement of Low-Lying beta-Emitting Isomers in Ag-123,Ag-325",
journal="Physical Review Letters",
year="2019",
publisher="Amer Physical Soc",
volume="122",
number="21",
pages="212502--6pp",
abstract="The beta-delayed gamma-ray spectroscopy of neutron-rich Ag-123,Ag-325 isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN, and the long-predicted 1/2(-) beta-emitting isomers in Ag-123,Ag-325 are identified for the first time. With the new experimental results, the systematic trend of energy spacing between the lowest 9/2(+) and 1/2(-) levels is extended in Ag isotopes up to N = 78, providing a clear signal for the reduction of the Z = 40 subshell gap in Ag towards N = 82. Shell-model calculations with the state-of-the-art V-MU plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in Ag-123,Ag-325. The tensor force is found to play a crucial role in the evolution of the size of the Z = 40 subshell gap. The observed inversion of the single-particle levels around Ag-123 can be well interpreted in terms of the monopole shift of the pi 1g(9/2) orbitals mainly caused by the increasing occupation of nu 1h(11/2) orbitals.",
optnote="WOS:000469334100003",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4031), last updated on Wed, 12 Jun 2019 14:38:42 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.122.212502",
opturl="https://doi.org/10.1103/PhysRevLett.122.212502",
language="English"
}