B(E2) Evaluation for 01+→21+ Transitions in Even-Even Nuclei

Abstract

A collaborative study by Brookhaven-McMaster-Central Michigan is underway to evaluate B(E2)↑ for 0 + 1 → 2 + 1 transitions. This work is a continuation of a previous USNDP evaluation and has been motivated by a large number of recent measurements and nuclear theory developments. It includes an extended compilation, data evaluation procedures and shell model calculations. The subset of B(E2)↑ recommended values for nuclei of relevance to the double-beta decay problem is presented, and evaluation policies of experimental data and systematics are discussed. Future plans for completion of the B(E2;0 + 1 → 2 + 1 ) evaluation project are also described.

Study of electromagnetic properties and structure of yrast bands in neutron-rich 70–76Zn isotopes

“…The deformation parameters used in the present calculation after self-consistent calculations are very close to the experimental deformation values[7,31,42] presented inTable 1.InTable 2, the systematics of E(2 + 1 ) and R 42 are presented for 70-76 Zn. It was shown by Casten et al[43] that the shape of a nucleus depends sensitively on the values of E(2 + 1 ) and R42 . The systematics of the values of E(2 + 1 ) and R 42 along an isotopic mass chain indicates the development of deformation in the isotopic mass chain with changing mass number (A).…”

Tables of E2 transition probabilities from the first 2+ states in even–even nuclei

“…The first update of B(E2) values for Cr, Fe, Ni and Zn isotopes (Z∼28 region) has been recently published by the joint effort of NNDC, Brookhaven National Laboratory (BNL), McMaster and Central Michigan Universities [14]. This update supplied valuable feedback to our collaboration from the research community [15], which has helped to improve the quality of the present work.…”

New limit for the half-life of double beta decay of 94Zr to the first excited state of 94Mo

“…The motivation for the present work is to search for DBD of 94 Zr to the 2 + 1 excited state of 94 Mo at 871.1 keV with better sensitivity. The 94 Zr study was also done keeping in mind that double beta decay with ±2 neutron numbers have similar NTME values [43]. Hence, it could be also relevant for the 96 Zr isotope which is more favoured due to its high Q ββ value.…”