| Irfu-09-103
|
|---|
| Shape evolution in self-conjugate nuclei, and the transitional nucleus $^{68}Se$ |
| A. Obertelli et al (F. Flavigny, A. Goergen, W. Korten, J. Ljungvall, B. Sulignano) |
| We report on the first measurement of the absolute transition strength B(E2;0+
1 ! 2+
1 ) in the
self-conjugate nucleus 68Se. The obtained value shows that 68Se has similar properties than the
triaxial 64Ge and is at the edge of an onset of deformation towards the heavier nuclei 72Kr and 76Sr.
The low-lying spectroscopy of self-conjugate nuclei in this mass region is correctly reproduced by
beyond-mean-field calculations using the Gogny D1S interaction that predict a strong triaxiality in
the 68Se ground state with a positive quadrupole moment. |
