Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 24: Nuclear Physics / Spectroscopy III

HK 24.2: Gruppenbericht

Mittwoch, 13. März 2002, 11:15–11:45, B

Search for the Spin-Dipole Resonance in ¹²B — •M.A. de Huu¹, A.M. van den Berg¹, N. Blasi², M. Hagemann³, M.N. Harakeh¹, J. Heyse³, M. Hunyadi¹, R. de Leo⁴, S. Micheletti², H. Okamura⁵, and H.J. Wörtche¹ — ¹Kernfysisch Versneller Instituut, Groningen, The Netherlands — ²INFN, Milano, Italy — ³Vakgroep Subatomaire en Stralingsfysica, Universiteit Gent, Belgium — ⁴INFN, Bari, Italy — ⁵Saitama University, Saitama, Japan

We report on an experiment performed at KVI to search for the spin-dipole resonance in ¹²B and to decompose it into its three different spin components (J^π=0⁻, 1⁻, and 2⁻) by using the (d^→,²He + n) reaction on ¹²C. To populate states in ¹²B, we used a purely tensor-polarized deuteron beam at E_d = 170 MeV extracted from the AGOR-cyclotron. The two outgoing protons of the unbound ²He nucleus from the ¹²C(d,²He) reaction were measured with the Big-Bite Spectrometer and the EuroSuperNova focal-plane detection system. In coincidence, neutrons emitted from unbound states in ¹²B were detected with the EDEN detector using a time-of-flight technique for the energy determination of the neutrons. Both the data obtained for the tensor analyzing power and the angular correlations for the neutron-decay channels will be used to disentangle the contributions of the different spin-dipole states. Preliminary results of the analysis will be shown.