Delayed g9/22 alignment in the N=Z nucleus 72Kr

被引:101
作者
de Angelis, G [1 ]
Fahlander, C
Gadea, A
Farnea, E
Gelletly, W
Aprahamian, A
Bazzacco, D
Becker, F
Bizzeti, PG
Bizzeti-Sona, A
Brandolini, F
de Acuna, D
De Poli, M
Eberth, J
Foltescu, D
Lenzi, SM
Lunardi, S
Martinez, T
Napoli, DR
Pavan, P
Petrache, CM
Alvarez, CR
Rudolph, D
Rubio, B
Satula, W
Skoda, S
Spolaore, P
Thomas, HG
Ur, CA
Wyss, R
机构
[1] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy
[2] Inst Fis Corpuscular, Valencia 46100, Spain
[3] Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England
[4] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy
[5] Ist Nazl Fis Nucl, Sez Firenze, I-35131 Padua, Italy
[6] Univ Munich, Sekt Phys, D-85748 Garching, Germany
[7] Oak Ridge Natl Lab, Joint Inst Heavy Ion Res, Oak Ridge, TN 37831 USA
[8] Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA
[9] Univ Warsaw, Inst Theoret Phys, PL-00681 Warsaw, Poland
[10] KTH Karnfysik, S-10405 Stockholm, Sweden
[11] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany
[12] Univ Florence, Dipartimento Fis, I-50125 Florence, Italy
[13] Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy
[14] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA
基金
美国国家科学基金会;
关键词
N = Z nuclei; Kr-72; gamma-gamma-light charged particle coincidences; deduced levers; four quasi-particle alignment; T = 0 pairing;
D O I
10.1016/S0370-2693(97)01217-3
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The structure of Kr-72 has been investigated at GASP through the Ca-40(Ca-40,2 alpha) reaction at a beam energy of 160 MeV using the 4 pi ISIS Si-ball for reaction channel selection. The level scheme has been extended up to an excitation energy of approximate to 8.5 MeV. The spins and parities of the observed levels are assigned tentatively. The observed band shows the predicted change from oblate to prolate shape. The four quasi-particle g(9/2) 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. (C) 1997 Elsevier Science B.V.
引用
收藏
页码:217 / 222
页数:6
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