학술논문
Shape coexistence revealed in the $N=Z$ isotope $^{72}$Kr through inelastic scattering
Document Type
Working Paper
Author
Wimmer, K.; Arici, T.; Korten, W.; Doornenbal, P.; Delaroche, J. -P.; Girod, M.; Libert, J.; Rodríguez, T. R.; Aguilera, P.; Algora, A.; Ando, T.; Baba, H.; Blank, B.; Boso, A.; Chen, S.; Corsi, A.; Davies, P.; de Angelis, G.; de France, G.; Doherty, D. T.; Gerl, J.; Gernhäuser, R.; Goigoux, T.; Jenkins, D.; Kiss, G.; Koyama, S.; Motobayashi, T.; Nagamine, S.; Niikura, M.; Nishimura, S.; Obertelli, A.; Lubos, D.; Phong, V. H.; Rubio, B.; Sahin, E.; Saito, T. Y.; Sakurai, H.; Sinclair, L.; Steppenbeck, D.; Taniuchi, R.; Vaquero, V.; Wadsworth, R.; Wu, J.; Zielinska, M.
Source
Subject
Language
Abstract
The $N=Z=36$ nucleus $^{72}$Kr has been studied by inelastic scattering at intermediate energies. Two targets, $^{9}$Be and $^{197}$Au, were used to extract the nuclear deformation length, $\delta_\text{N}$, and the reduced $E2$ transition probability, $B(E2)$. The previously unknown non-yrast $2^+$ and $4^+$ states as well as a new candidate for the octupole $3^-$ state have been observed in the scattering on the Be target and placed in the level scheme based on $\gamma-\gamma$ coincidences. The second $2^+$ state was also observed in the scattering on the Au target and the $B(E2;\;2^+_2 \rightarrow 0^+_1)$ value could be determined for the first time. Analyzing the results in terms of a two-band mixing model shows clear evidence for a oblate-prolate shape coexistence and can be explained by a shape change from an oblate ground state to prolate deformed yrast band from the first $2^+$ state. This interpretation is corroborated by beyond mean field calculations using the Gogny D1S interaction.
Comment: 12 pages, 11 figures, accepted European Physical Journal A
Comment: 12 pages, 11 figures, accepted European Physical Journal A