Production of fragments with 
in interaction of
12.7 GeV 4He+U, Pb, Au and Ag: track detector study
Z. Todorovic1 - S. Savovic2 - S. Jokic3
1 Institute of Physics, P. O. Box 68, 11080 Belgrade, Yugoslavia
2 Faculty of Science, P. O. Box 60, 34000 Kragujevac, Yugoslavia
3 Institute of Nuclear Sciences "Vinca", 11101 Belgrade, Yugoslavia
Received: 28 November 1997 / Revised version: 24 April 1998 Communicated by B. Povh
Abstract
The processes of production of fragments with in the interaction of 12.7 GeV
4He with U, Pb, Au and Ag have been analyzed using the polycarbonate track detector Makrofol.
The sandwich technique was used which enables direct observation of multiply charged fragment
emission by a single nucleus. The decay channels ending with one, two, or more (three, four)
fragments were detected. A classification scheme based on the multiplicity of heavy fragments with
Z>20 was used in order to identify the events belonging to the different reaction channels.
The cross sections, excitation energies and multiplicities of intermediate-mass fragments 
have been determined for the various reaction mechanisms, and their variation as a
function of the target mass has been investigated.
PACS
25.55.-e 3H-, 3He-, and 4He-induced reactions -
25.70.P2 Multifragment emission and correlations -
25.85.Ge Charged-particle-induced fission
Copyright Springer-Verlag
