High-precision Penning-trap mass measurements of Cd and In isotopes at JYFLTRAP remove the fluctuations in the two-neutron separation energies

TL;DR

This study presents high-precision mass measurements of specific Cd and In isotopes, clarifying nuclear structure and removing previous fluctuations in two-neutron separation energies, with implications for nuclear models around N=70.

Contribution

First direct mass measurements of $^{118,119}$Cd and $^{117-119}$In isotopes using JYFLTRAP, improving nuclear data accuracy and understanding of nuclear structure.

Findings

Masses of $^{117}$In and $^{118}$Cd agree with literature.

Updated masses remove fluctuations in two-neutron separation energies.

No significant structural changes around N=70.

Abstract

We report on the first direct mass measurements of the $^{118,119}$Cd and $^{117-119}$In isotopes performed at the Ion Guide Isotope Separator On-Line facility using the JYFLTRAP double Penning trap mass spectrometer. The masses of $^{117}$In and $^{118}$Cd isotopes are in agreement with the literature, while $^{118,119}$In and $^{119}$Cd differ from literature by 49, 13 and 85 keV (6.1, 1.9 and 2.1 standard deviations), respectively. The excitation energy of the $^{118}$In first isomeric state, $E_x = 40.3(25)$ keV, was determined for the first time. The updated mass values removed the fluctuations observed in the two-neutron separation energies and lead to a smoother linear decrease of both isotopic chains. The $\log(ft)$ value for the $^{118}$Cd decay is also found to increase from 3.93(6) to 4.089(8). The reported results indicate an absence of significant structural changes around $N=70$.