Atlas of Nuclear Isomers -- Second Edition

TL;DR

This paper provides an updated, comprehensive atlas of nuclear isomers with half-lives ≥10 ns, compiling experimental data, spectroscopic properties, and systematic features, based on extensive literature review and database consultation.

Contribution

It offers a revised, detailed compilation of nuclear isomer data, including re-evaluated half-lives and systematic features, enhancing the 2015 edition with recent literature and database updates.

Findings

Re-evaluated half-lives compared to 2015 edition

Inclusion of new data from recent literature and databases

Discussion of systematic features of nuclear isomers

Abstract

We present an updated version of the 2015-Atlas of Nuclear Isomers \cite{jain2015}, compiling and evaluating experimental data for the isomers with half-life $\ge 10$ $\it{ns}$, together with their spectroscopic properties such as excitation-energies, half-lives, decay modes, spins and parities, energies and multipolarities of isomeric transitions, along with the relevant original references in literature. The current version of Atlas presents many re-evaluated half-lives as compared to the 2015 edition, where values were referred to Nuclear Data Sheets publications, when no new data existed. The ENSDF database \cite{Ensdf}, together with the XUNDL \cite{Xundl} and the NUBASE2020 \cite{Kondev2021} databases have been consulted for completeness, yet, data from original papers from journals were considered in the present evaluation, and the NSR bibliographic database \cite{Nsr} has been searched to ensure that this work is as complete and current as possible. Several useful systematic features of nuclear isomers covered in this Atlas have been discussed. Literature cutoff date for the extraction of data is October 31, 2022.