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 View the MathML source 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.
Delayed alignment in the N = Z nucleus 72Kr
BRANDOLINI, FRANCO;LENZI, SILVIA MONICA;LUNARDI, SANTO;PAVAN, PIETRO;
1997
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 View the MathML source 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.
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