Prompt ternary break-up in 32S+59Co and 32S+63Cu reactions at 5.6
A
MeV
L. Vannucci1 - P. Boccaccio1 - A. Bologna1 - R.A. Ricci1,2 -
G. Vannini3,4 - R. Don
3,4 - I. Massa3,4 - J.P. Coffin5 -
P. Fintz5 - G. Guillaume5 - F. Jundt5 - F. Rami5 - P. Wagner5
1 Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, 35020 Legnaro, Italy
2 Dipartimento di Fisica dell'Universita'di Padova, 35100 Padova, Italy
3 Dipartimento di Fisica dell'Universita' di Bologna, 40100 Bologna, Italy
4 Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, 40100 Bologna, Italy
5 Centre de Recherches Nucleaires, Universite' Louis Pasteur, Strasbourg, France
Received: 3 July 1998 / Revised version: 15 October 1999 Communicated by C. Signorini
Abstract
Final states indicating the presence in the reaction of three-body
fragmentation processes has been observed in 32S+59Co and
32S+63Cu dissipative collisions at 5.6 AMeV.
Besides the already observed sequential binary process, data analysis
reveals the presence of prompt ternary break-up of the composite system.
Indications on the system configuration at the scission have been deduced
by analyzing the event shape in the momentum phase space.
The decay appears to occur in a collinear configuration, one of the produced
fragments originating from the neck which connects the other two.
In spite of the large energy dissipation, structure effects in the charge
partition seem to affect part of events.
PACS
25.70.-z Low and intermediate energy heavy-ion reactions -
25.70.Lm Strongly damped collisions -
25.70.Pq Multifragment emission and correlations
Copyright Società Italiana di Fisica, Springer-Verlag 2000
