Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 16: Spectroscopy: 17 ≤ A ≤ 70

HK 16.3: Talk

Monday, March 16, 1998, 17:30–17:45, D

In-beam γ-Ray Spectroscopy with Binary Reactions Using the HMI Binary Reaction Trigger Spectrometer with OSIRIS — •S. Thummerer, B. Gebauer, W. von Oertzen, and M. Wilpert — Hahn-Meitner-Institut, D-14109 Berlin, Germany

In test experiments for applications with EUROBALL the potential of the HMI Binary Reaction Spectrometer (BRS) as a reaction channel filter for γ-ray spectroscopy with binary exit channels was investigated, using the BRS as an ancillary detector for the smaller γ-detector array OSIRIS. The BRS is a kinematic coincidence setup combining two large-area, fourfold segmented gas detector telescopes, comprising low-pressure multiwire chambers and Bragg-curve ionization chambers. Correlation measurements of two heavy ejectiles with respect to in-plane and out-of-plane scattering angles, time of flight, Bragg-peak height (Z), range and rest energy deliver exclusive detection of binary and good identification of ternary exit channels. Thus, γ-ray transitions, corresponding to very low fractions of the total reaction cross section, can be detected. Examples are taken from multiple α-transfer channels of the reactions ³⁶Ar + ²⁴Mg and ³⁶Ar + ⁴⁰Ca, which were studied in preparation of an EUROBALL experiment aiming at the investigation of hyperdeformed α-cluster states.