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 g_9/2² 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. Wyss¹⁰ — ¹Inst. 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 g_9/2² 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