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Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 39: Nuclear Physics / Spectroscopy VI

HK 39.1: Group Report

Thursday, March 14, 2002, 14:00–14:30, B

Neutron decay studies of the Isoscalar Giant Dipole Resonance — •M. Hunyadi1, A.M. van den Berg1, N. Blasi2, B. Davids1, U. Garg3, J. Gulyás4, M.N. Harakeh1, M.A. de Huu1, D. Sohler4, and H.J. Wörtche11Kernfysisch Versneller Instituut, Groningen, The Netherlands — 2INFN Milano, Milano, Italy — 3University of Notre Dame, Notre Dame, USA — 4Institute of Nuclear Research, Debrecen, Hungary

The Isoscalar Giant Dipole Resonance (ISGDR) is the response of the nucleus to the second-order isoscalar dipole operator. motion). Its energy systematics are important in the determination of the nuclear incompressibility. So far, only singles experiments, using inelastic α-scattering, gave evidence for the ISGDR in a few nuclei, but they suffered from strong instrumental and nuclear-continuum backgrounds at very forward angles, and a partial overlap with the isoscalar giant octupole resonance. Presently, no experimental data are available on the decay properties of the ISGDR, which would be a crucial test for the theoretical descriptions of its microscopic structure and damping process.

Recently we performed coincidence experiments using inelastic α- scattering at 50 MeV/A searching for the direct neutron decay of the ISGDR in 208Pb, 124Sn and 90Zr. A clear indication of the presence of the direct decay component was obtained. Moreover, we exploited the advantage of the coincidence technique resulting in a considerable suppression of the background contribution. These results enabled the direct comparison with a recently published CRPA calculation.

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