Author/Authors :
G. De Angelis، نويسنده , , C. Fahlander، نويسنده , , A. Gadea، نويسنده , , E. Farnea، نويسنده , , W. Gelletly، نويسنده , , A. Aprahamian، نويسنده , , D. Bazzacco، نويسنده , , F. Becker، نويسنده , , P.G. Bizzeti، نويسنده , , A. Bizzeti-Sona، نويسنده , , F. Brandolini، نويسنده , , D. De Acuna، نويسنده , , M. De Poli، نويسنده , , J. Eberth، نويسنده , , D. Foltescu، نويسنده , , M.A. Bentley and S.M. Lenzi، نويسنده , , S. Lunardi، نويسنده , , T. Martinez، نويسنده , , D.R. Napoli، نويسنده , , P. Pavan، نويسنده , , et al.، نويسنده ,
Abstract :
The structure of 72Kr has been investigated at GASP through the 40Ca(40Ca,2α) reaction at a beam energy of 160 MeV using the 4π ISIS Si-ball for reaction channel selection. The level scheme has been extended up to an excitation energy of ≈ 8.5 MeV. The spins and parties of the observed levels are assigned tentatively. The observed band shows the predicted change from oblate to prolate shape. The four quasi-particle g92 alignment is found to be significantly delayed in rotational frequency with respect to the heavier Kr isotopes. Such a delay contradicts the predictions of standard mean-field calculations and may reflect either additional correlations in the T = 0 pairing channel or coupling to vibrational degrees of freedom or both.
Keywords :
N = Z nuclei , 72Kr , ?-?-light charged particle coincidences , Deduced levels , Four quasi-particle alignment , T = 0 pairing
