Eur. Phys. J. A (2005) 23: 19-31
https://doi.org/10.1140/epja/i2004-10071-3

Emission of unbound ⁸Be and ¹²C ^* (0⁺ ₂) clusters in compound nucleus reactions

¹ Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, D-14195, Berlin, Germany
² Hahn-Meitner-Institut Berlin, Glienicker Straße 100, D-14109, Berlin, Germany
³ Rudheight 0.09ex width 0.315emer Bošković Institute, Zagreb, Croatia
⁴ INFN-Laboratori Nazionali del Sud and Università di Catania, Catania, Italy
⁵ INFN-Laboratori Nazionali di Legnaro, Legnaro, Italy
⁶ Dipartimento di Fisica and INFN, Padova, Italy
⁷ Institut de Recherches Subatomiques, IReS, Strasbourg, France

^* e-mail: kokalova@hmi.de

Received: 28 April 2004
Accepted: 1 September 2004
Published online: 24 November 2004

Abstract

We have studied the emission of light unbound clusters, ⁸Be and ¹²C ^* (0⁺ ₂), in the reactions ¹⁸O + ¹³C →^{31} Si →^{23} Ne + ⁸Be and ²⁸Si + ²⁴Mg →^{52} Fe →^{40} Ca + ¹²C ^* (0⁺ ₂). The γ-ray spectra obtained in coincidence with ⁸Be and ¹²C ^* (0⁺ ₂) emission have been studied relative to the statistical emission of two or three α-particles. The angular-momentum-to-energy balance of the cluster emission is compared with that of multiple-α emission. The properties of the energy spectra of the binary process and the population of the residual nuclei by cluster emission are discussed. It is observed that cluster emission carries away less excitation energy on average than the sequential emission of the individual components.