Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Structure/Spectroscopy

HK 10.18: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

CLUSTER EMISSION (⁸Be, ¹²C^∗(0₂⁺)) IN COMPOUND NUCLEUS REACTIONS — •Tz. Kokalova^1,2, W. von Oertzen^1,2, S. Torilov^1,2, S. Thummerer², H.G. Bohlen², M. Milin^1,2, A. Tumino², G. de Angelis³, M. Axiotis³, E. Farnea³, N. Marginean³, T. Martinez³, D.R. Napoli³, S.M. Lenzi⁴, C. Ur⁴, M. Rousseau⁵, and P. Papka⁵ — ¹Freie Universität Berlin, Germany — ²Hahn-Meitner-Institut Berlin, Germany — ³INFN-Laboratori Nazionali di Legnaro, Legnaro, Italy — ⁴Dipartimento di Fisica and INFN, Padova, Italy — ⁵Institut de Recherches Subatomiques, IreS, Strasbourg, France

The emission of unbound ⁸Be and ¹²C^∗ clusters has been studied in 1) the ¹⁸O+¹³C→ ²³Ne+ (⁸Be or 2α) reaction, at an energy of E_L(¹⁸O) = 100 MeV, meant for the study of Ne isotopes and 2) the ²⁸Si+²⁴Mg → ⁴⁰Ca +(¹²C or 3α) reaction, at an incident energy of 130 MeV, an experiment designed to observe the emission of ⁸Be and the 3α channel as the main compound decay channels. The results obtained from comparing the γ-ray spectra in the case of fusion-fission and fusion-evaporation leading to the same residual nuclei are discussed. We observed that in the fusion-fission process the residual nucleus has more excitation energy and the subsequent emission of another light particle (n, p or α) is enhanced. A quantitative analysis of the energy spectra of 2 or 3 subsequently emitted α-particles and ⁸Be or ¹²C^∗ clusters has been carried out. The angular-momentum-to-energy-balance of the cluster emission is compared with that of the multiple α-emission and an interpretation of the results is given.