Precision mass measurements of neutron-rich nuclei between N=50 and 82

TL;DR

This paper reviews recent high-precision mass measurements of neutron-rich nuclei between N=50 and 82, highlighting their impact on understanding nuclear structure and shell effects.

Contribution

It presents new mass data for nearly 300 nuclides obtained via Penning traps, enhancing knowledge of nuclear binding energies in this region.

Findings

Refined two-neutron binding energies reveal shell gap variations.

Data shows changes in pairing effects near N=82.

Enhanced understanding of nuclear structure in neutron-rich isotopes.

Abstract

Our knowledge of binding energies of neutron-rich nuclei has experienced a major revision during the last five years due to the introduction of Penning-trap based mass measurements. New mass values for nearly 300 nuclides produced in fission with uncertainties of 10 keV or less have become available. The data produced at three Penning trap facilities at Jyvaskyla, CERN-ISOLDE and Argonne cover all isotopic chains from Ni to Pr, except iodine. In this talk some of this data is reviewed and applied using the mass differentials such as two-neutron binding energy and odd-even staggering to probe their sensitivity on changes in nuclear structure and on the strength of the N=82 shell gap and associated pairing effects.