Abstract
The + /EC decay of 72 Kr has been studied by means of the Total Absorption gamma Spectroscopy technique in order to determine the Gamow-Teller strength B(GT) distribution. The comparison with theoretical predictions suggests a dominantly oblate deformation for the 72 Kr ground state. The de-excitation of low-energy excited states in 72 Br is studied via conversion electron spectroscopy. The conversion coe cients and multipolarities of 14 low-energy transitions are determined and the spin and parity of the levels involved are deduced.
Highlights
Nuclei in the mass region A≈70-80 are predicted to exhibit sudden shape changes from prolate to oblate and back to prolate while moving along the N=Z line [1], see figure 1
An unusual oblate deformation is predicted for the ground states of 70Br and 72Kr
The existence of a 0+ shape isomer state at 671(2) keV in 72Kr was interpreted as the prolate band head state causing a prolate mixing amplitude for the ground state of λ = 0.1 [4]
Summary
Nuclei in the mass region A≈70-80 are predicted to exhibit sudden shape changes from prolate to oblate and back to prolate while moving along the N=Z line [1], see figure 1. The predicted B(GT) distributions corresponding to these minima are different This fact gives the opportunity to deduce information on the ground state deformations for nuclei in the mass region, such as 74Kr [7] and 76Sr [8]. A careful study of the β decay properties of these “waiting point” nuclei in terrestrial conditions is crucial to perform reliable astrophysical network calculations, specially for weak interaction rates [9].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
