Wednesday, June 26, 2013

1306.6027 (A. R. Balabekyan et al.)

Recoil Properties of Fragments Formed in the Deuteron-Induced Reaction
of Gold at Incident Energy 2.2 AGeV

A. R. Balabekyan, N. A. Demekhina, G. S. Karapetyan, D. R. Drnoyan, V. I. Zhemenik, J. Adam, L. Zavorka, A. A. Solnyshkin, V. M. Tsoupko-Sitnikov, J. Khushvaktov
The thick-target recoil properties of 90 nuclides, varying from $^{24}$Na to $^{198}$Au, formed in the interaction of 4.4-GeV deuterons with $^{197}$Au, have been measured for the first time in the literature, up to our knowledge, in order to study the systematics of their variation with product mass. The products forward-to-backward ratios ($F/B$) exhibit the different behavior, which depends upon the mass region of the reaction products. There was an evidence supportive of the existence of several different mechanisms in the reaction studied. The results are analyzed by the two-step model of high-energy reactions and discussed in terms of the different reaction mechanisms, spallation, fission and fragmentation. Fission contributes appreciably to the formation of products in the mass region 65 $\leq$ A $\leq$ 120 amu. The kinematic features for deuteron-induced reaction have been compared to those for reactions of energetic protons with gold. The relation between forward momentum and mean deposition energy allowed to estimated the mean excitation energy for the different mass range of the reaction products. It was concluded, that a few sources having different excitations can take part in the formation of residual nuclei.
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