MICROSCOPIC DYNAMICS OF SHAPE COEXISTENCE PHENOMENA AROUND <sup>68</sup><font>Se</font> AND <sup>72</sup><font>Kr</font>

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The adiabatic self-consistent collective coordinate (ASCC) method is applied to the pairing-plus-quadrupole (P + Q) model Hamiltonian including the quadrupole pairing, and the oblate-prolate shape coexistence phenomena in proton-rich nuclei, 68Se and 72Kr, are investigated. It is shown that the collective path connecting the oblate and prolate local minima runs along a triaxial valley in the beta-gamma plane. Quantum collective Hamiltonian is constructed and low-lying energy spectra and E2 transition probabilities are calculated for the first time using the ASCC method. Basic properties of the shape coexistence/mixing are well reproduced. We also clarify the effects of the time-odd pair field on the collective mass (inertial function) for the large-amplitude vibration and on the rotational moments of inertia about three principal axes.

10 pages, 4 figures, Talk given at The International Symposium on Physics of Unstable Nuclei (ISPUN07), Hoi An, Vietnam, 3-7 Jul 2007

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