Structure of odd-A Ag isotopes studied via algebraic approaches

TL;DR

This paper models the structure of odd-A silver isotopes using the Interacting boson-fermion model, successfully reproducing experimental data and highlighting the astrophysical significance of low-lying states due to the J-1 anomaly.

Contribution

It applies the IBFM-1 to odd-A Ag isotopes, explaining the J-1 anomaly and its impact on nuclear structure and astrophysical processes.

Findings

Reproduces level schemes and electromagnetic properties of $^{103-115}$Ag.

Explains the J-1 anomaly and its effect on energy levels.

Highlights the role of low-lying states in stellar environments.

Abstract

The structure of the odd-$A$ silver isotopes $^{103-115}$Ag is discussed within the frame of the Interacting boson-fermion model (IBFM). An overview of their key properties is presented, with particular attention paid to the $"$J-1 anomaly$"$, represented by an abnormal ordering of the lowest 7/2$^{+}$ and 9/2$^{+}$ states. By examining previously published data and newly performed calculations, it is demonstrated that the experimentally known level schemes and electromagnetic properties of $^{103-115}$Ag can be reproduced well within IBFM-1 by using a consistent set of model parameters. The contribution of different single-particle orbitals to the structure of the lowest-lying excited nuclear states in $^{103-115}$Ag is discussed. Given that the $J$-1 anomaly brings down the 7/2$^{+}$ level from the $j^{-3}$ multiplet to energies which can be thermally populated in hot stellar environments, the importance of low-lying excited states in odd-$A$ silver isotopes for astrophysical processes is outlined.