Isobaric Multiplet Mass Equation for $A \le 71$ Revisited

TL;DR

This paper revisits the isobaric multiplet mass equation for nuclei with mass number up to 71, analyzing recent experimental data to identify deviations from the quadratic form of the IMME.

Contribution

It provides an updated compilation of energy levels and IMME coefficients for A ≤ 71 based on the latest mass evaluations and experimental results.

Findings

Significant deviations from quadratic IMME for A=9, 32, 35 multiplets.

Updated energy levels and IMME coefficients for A ≤ 71.

Analysis based on recent mass measurements and experimental data.

Abstract

Accurate mass determination of short-lived nuclides by Penning-trap spectrometers and progress in the spectroscopy of proton-rich nuclei have triggered renewed interest in the isobaric multiplet mass equation (IMME). The energy levels of the members of $T=1/2, 1, 3/2,$ and 2 multiplets and the coefficients of the IMME are tabulated for $A\le 71$. The new compilation is based on the most recent mass evaluation (AME2011) and it includes the experimental results on energies of the states evaluated up to end of 2011. Taking into account the error bars, a significant deviation from the quadratic form of the IMME for the $A=9, 35$ quartets and the $A=32$ quintet is observed.