Deformation of Sr and Rb isotopes close to theN=Zline viaβ-decay studies using the total absorption technique

Abstract

A study of the Gamow-Teller strength distributions B(GT) in the beta decay of 78 Sr and 76,78 Rb has been made using a total absorption spectrometer (TAS). Following the success in deducing the sign of the deformation for 76 Sr, a similar approach is adopted for 78 Sr based on a comparison of the measured B(GT) with quasiparticle random-phase approximation calculations. This work confirms its previously expected prolate deformation in the ground state. Conclusions about the structure of the odd-odd 76,78 Rb isotopes have been drawn based on their measured B(GT) distributions.

Shape study of theN=ZnucleusKr72viaβdecay

“…The Lucrecia TAS detection system permanently installed at the ISOLDE facility (CERN) was used. Previous studies on the shapes of nuclei in the mass region using this procedure and the same experimental setup have provided conclusive results for 76 Sr [4], 78 Sr [20] (both prolate), and 74 Kr [21] (shape mixing).…”

Shapes ofPb192,190ground states fromβ-decay studies using the total-absorption technique

“…Here we are concerned with shapes in heavy nuclei and in particular with the determination of shapes using total absorption spectroscopy. The method, which is based on a proper measurement of the β strength as a function of excitation energy in the daughter nucleus and its comparison with theoretical calculations, has only been applied up to now to medium-mass nuclei in the A ∼ 80 region [5][6][7]. The present result illustrates the more general scope of the total absorption technique as a tool for inferring the shapes of exotic nuclei when combined with the results of shape-sensitive theoretical calculations.…”

Total absorption spectroscopy of theβdecay ofGa76

“…The method of using total absorption spectroscopy to learn about the structure of the ground state of the parent nucleus has been successfully performed in the past (for example, Refs. [22][23][24][25][26]). …”