Hexadecapole strength in the rare isotopes Kr
M. Spieker (Department of Physics, Florida State University, Tallahassee, USA)
; S.E. Agbemava (Facility for Rare Isotope Beams, Michigan State University, East Lansing, USA); D. Bazin (Department of Physics and Astronomy, Michigan State University, East Lansing, USA, Facility for Rare Isotope Beams, Michigan State University, East Lansing, USA); S. Biswas (Facility for Rare Isotope Beams, Michigan State University, East Lansing, USA); P.D. Cottle (Department of Physics, Florida State University, Tallahassee, USA); et al - Show all 18 authors
In the Ge-Sr mass region, isotopes with neutron number are known to feature rapid shape changes with both nucleon number and angular momentum. To gain new insights into their structure, inelastic proton scattering experiments in inverse kinematics were performed on the rare isotopes 74,76Kr. This work focuses on observables related to the states of the Kr isotopes and, in particular, on the hexadecapole degree of freedom. By performing coupled-channels calculations, hexadecapole deformation parameters were determined for the states of 74,76Kr from inelastic proton scattering cross sections. Two possible coupled-channels solutions were found. A comparison to predictions from nuclear energy density functional theory, employing both non-relativistic and relativistic functionals, clearly favors the large, positive solutions. These values are unambiguously linked to the well deformed prolate configuration. Given the trend, established in this work, it appears that values could provide a sensitive measure of the nuclear shell structure.
