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Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 28: Spectroscopy: 70 ≤ A < 110

HK 28.1: Talk

Tuesday, March 17, 1998, 14:00–14:15, D

Delayed g9/22 alignment in the N=Z nucleus 72Kr* — •S. Skoda1, G. de Angelis2, C. Fahlander2, A. Gadea2, A. Aprahamian3, D. Bazzacco4, F. Becker1, P.G. Bizetti5, A. Bizetti-Sona5, F. Brandolini4, D. de Acuna2, M. De Poli2, J. Eberth1, D. Foltescu2, W. Gelletly6, S.M Lenzi4, S. Lunardi4, T. Martinez7, D.R. Napoli2, P. Pavan4, C.M. Petrache4, C. Rossi-Alvarez4, D. Rudolph8, B. Rubio7, W. Satula9, P. Spolaore2, H.G. Thomas1, C. Ur2, and R. Wyss101Inst. f. Kernphys., Univ. Köln, Zülpicher Str. 77, 50937 Köln, Germany — 2INFN Legnaro, Italy — 3Univ. Notre Dame, USA — 4INFN Padova, Italy — 5INFN Firenze, Italy — 6Univ. Surrey, Great Britain — 7IFC Valencia, Spain — 8Univ. München, Germany — 9Oak Ridge Nat. Lab., USA — 10KTH Stockholm, Sweden

The structure of 72Kr has been investigated at GASP through the 40Ca(40Ca,2α) reaction at a beam energy of 160 MeV using the channel selection of the ISIS Si-Ball [1]. The level scheme was extended up to 8.5 MeV and spin (16+). Spins and parities of the observed levels are assigned tentatively. The four quasi-particle g9/22 alignment is found to be delayed in rotational frequency. Such a delay contradicts the predictions of certain mean-field calculations. It may reflect either additional correlations in the T=0 pairing channel and/or coupling to vibrational degrees of freedom.
* supported by the BMBF under contract No. 06OK668I(0)
G. de Angelis, acc. Phys. Lett. B

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