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HK: Physik der Hadronen und Kerne

HK 5: Kernphysik/Spektroskopie I - Exotische Kerne

HK 5.2: Talk

Monday, March 19, 2001, 17:00–17:15, D

Decay Spectroscopy of ¹⁰²Sn — •A. Stolz¹, T. Faestermann¹, M. Münch¹, R. Schneider¹, K. Sümmerer², E. Wefers¹, J. Friese¹, H. Geissel², M. Hellström³, P. Kienle¹, H.-J. Körner¹, G. Münzenberg², C. Schlegel², P. Thirolf⁴, and H. Weick² — ¹TU München — ²GSI Darmstadt — ³Universität Lund, Schweden — ⁴LMU München

Neutron deficient nuclei near ¹⁰⁰Sn have been produced by fragmentation of a 1 A·GeV ¹¹²Sn beam in a Be target. The fragments were separated in the 0^∘ magnetic spectrometer FRS at GSI. The unambiguously identified ions were stopped in an implantation detector consisting of four double-sided Si-strip detectors. By correlating the implantation position with the decay position we were able to suppress the background effectively. Around the implantation zone two 1 cm thick stacks of Si detectors were mounted for beta energy measurements. The Si detector was surrounded by a segmented NaI detector and a Ge Clover detector. The aim of the experiment was to determine the Gamow-Teller strength in the decay of ¹⁰⁰Sn and neighbouring nuclei. During a 50 hrs run one ¹⁰⁰Sn was obtained resulting in a production cross section of 1.8_−1.3^+3.2 pb. The decay data of this event together with 7 events observed in 1994 by our group [1] will give a hint to the decay scheme of this nucleus. For determining the GT strength, we collected β- and γ-data of ⁹⁸Cd, where the Q-value is unknown, and ¹⁰²Sn, where even the decay branching and the Q-value are not known. Next to ¹⁰⁰Sn these nuclei are the best candidates to address the problem of missing GT strength.

[1] R. Schneider et al., Z. Phys. A348 (1994)