Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 38: Spectroscopy 104 ≤ A < 140

HK 38.1: Talk

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

E2 and E3 transition strengths in ¹⁰⁴Sn and excitations of the ¹⁰⁰Sn core — •H. Grawe¹, M. Górska^1,2, D. Kast³, P.G. Bizzeti⁴, B.A. Brown⁵, G. De Angelis⁶, M. De Poli⁶, A. Dewald⁷, C. Fahlander^6,8, A. Jungclaus³, K.H. Maier⁹, Q. Pan⁶, R. Peus-quens⁷, M. Rejmund^1,2, and H. Tiesler⁷ — ¹GSI, D-64291 Darmstadt — ²Institute of Experimental Physics, University of Warsaw — ³II.Physikal. Institut, Universit"at G"ottingen, D-37073 G"ottingen — ⁴Dept. of Physics, University of Florence, I-50125 Florence — ⁵Dept. of Physics and Astronomy, MSU East Lansing, USA — ⁶INFN LNL, I-35020 Legnaro — ⁷IKP Universität zu Köln, D-50937 Köln — ⁸Dept. of Physics, University of Lund, Sweden — ⁹HMI, D-14091 Berlin

High spin states up to E_x= 10 MeV and I≃19 in the neutron deficient nucleus ¹⁰⁴Sn were studied following the reaction of ⁵⁰Cr+⁵⁸Ni at 205 MeV. The GASP γ-ray spectrometer at LNL in close geometry (P_ph=5%) and the Köln RDDS plunger setup were used to measure γγγ coincidences and lifetimes in the sub-ns range. Beyond the simplest ν(d_5/2, g_7/2) shell model space with I_max^π=10⁺ odd parity states involving the ν h_11/2 orbit and proton core excited states forming a M1 shears type band were identified, and strong E3 and E2 transitions were observed. Results are discussed within the frame of large scale shell model calculations in the 1ℏω valence neutron space, and in terms of excitations of the ¹⁰⁰Sn core, which is inaccessible to date for detailed γ- spectroscopy.