Shapes of the $^{192,190}$Pb ground states from beta decay studies using the total absorption technique

TL;DR

This study uses total absorption beta decay measurements and QRPA calculations to determine that the ground states of $^{192,190}$Pb isotopes are spherical, marking a novel application for heavy nuclei.

Contribution

First application of total absorption technique combined with theoretical calculations to determine nuclear shapes in heavy nuclei.

Findings

Ground states of $^{192,190}$Pb are spherical.

Total absorption technique effectively determines nuclear shapes.

Results enhance understanding of nuclear shape effects in heavy isotopes.

Abstract

The beta decay of $^{192,190}$Pb has been studied using the total absorption technique at the ISOLDE(CERN) facility. The beta-decay strength deduced from the measurements, combined with QRPA theoretical calculations, allow us to infer that the ground states of the $^{192,190}$Pb isotopes are spherical. These results represent the first application of the shape determination method using the total absorption technique for heavy nuclei and in a region where there is considerable interest in nuclear shapes and shape effects.