Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Physics/Spectroscopy

HK 10.14: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

γ-spectroscopic study of spin-isospin giant resonances in ²⁰⁸Bi — •A. Krasznahorkay^1,2, A.M. van den Berg², S. Brandenburg², M. Csatlós¹, M. Fujiwara^3,4, V. Hannen², M. N. Harakeh², J. Gulyás¹, F. Ihara⁴, Z. Máté¹, and R. Zegers² — ¹Institute of Nuclear Research (ATOMKI) Debrecen, Hungary — ²KVI, Groningen, The Netherlands — ³RCNP, Osaka, Japan — ⁴JAERI, Tokai, Japan

Spin-isospin giant resonances have been excited in ²⁰⁸Bi using the ²⁰⁸Pb(³He,t) reaction and the γ-decay of the states has been investigated in order to get a deeper insight into the microscopic structure of the spin-dipole (SD) and Gamow-Teller (GT) excitations and Isobaric Analogue States (IAS).

The experiments were carried out at the KVI using 177 MeV ³He beams from the AGOR superconducting cyclotron. The energy of the tritium ejectiles was analyzed by the BBS magnetic specrometer, which was set at zero degree with respect to the beam direction, while the energy of the γ-rays was measured with a large NaI detector equipped with anticoincidence shield.

We could observe transitions for the first time both from the SD and GT resonances to low-lying states with well defined particle-hole configurations.