Eur. Phys. J. A 12, 279-284 (2001)

Prompt emission of dipole radiation in nuclear reactions with radioactive beams

C.H. Dasso¹, H. Sofia² and A. Vitturi<sup>3

1</sup>  ECT* and Dipartimento di Fisica, Universitá di Trento, Trento, Italy and University of Sevilla, Sevilla, Spain
²  Departamento de Física, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
³  Dipartimento di Fisica and INFN, Università di Padova, Padova, Italy

sofia@tandar.cnea.gov.ar

(Received: 28 March 2001 / Revised version: 29 September 2001 Communicated by P. Schuck)

Abstract
Radioactive beams expand considerably the range of reactions with a large charge-to-mass asymmetry between projectile and target that can be probed experimentally. We introduce a simple model to estimate the magnitude and energy distribution of the prompt dipole gamma-emission that takes place while the symmetry is restored during the short contact time. In addition to this pre-equilibrium component we also introduce a procedure to calculate the delayed gamma-emission of statistical character that occurs after thermal equilibration of the compound system -or the binary reaction ejectiles- is reached.

PACS
21.60.-n - Nuclear-structure models and methods.
23.20.Js - Multipole matrix elements.

© Società Italiana di Fisica, Springer-Verlag 2001