Entropy produced in heavy ion collisions

Xi Hong-Fei，

Zhu Yong-Tai，

Shen Wen-Qing，

Wei Zhi-Yong

Nuclear Science and Techniques

Vol.8, No.3

pp.136-138

Published in print 01 Aug 1997

23100

A new observable, yield ratio of d/ (d+t+³He+⁴He) produced in heavy ion reactions is suggested as a measure of entropy. It is found that in quantum statistical model (QSM) , which is quite commonly used for extracting the entropy, the relation between this ratio and entropy is almost linear and independent of break-up density and N/Z ratio of the system. The experimental data of ¹²C+¹⁹⁷ Au from 30MeV/u to 84 MeV/u and of ¹⁹⁷Au+¹⁹⁷Au from 100 MeV/u to 250 MeV/u are compared with QSM calculation results. The values of entropy are obtained for C+Au and Au+Au system without assumption on break-up density.

EntropyHeavy ion reactionsQuantum statistical model

References

Siemens P J, Kapusta J I. Phys Rev Lett. 1979; 43: 1486

Speer J, Kohlmeyer B, Pöppl H et al. GSI Report, 1994; 1: 33

Kuhn C, Konopka J, Coffin J P et al. Phys Rev, 1993; C48: 1232

Konopka J, Graf H, Stöcker H et al. Phys Rev, 1994; C50: 2085

Hahn D, Stöcker H. Phys Rev, 1988; C37: 1048

Trockel R.

GSI Report

, 1987; 17

Baidu Scholar

Google Scholar

Bini M, Olmi A, Maurenzig P R et al. GSI Report, 1994; 1: 28

Risdorf W. Proc Int Workshop XX II, on Gross Properties of Nuclei and Nuclear Excitations, 20-25,01, 1992, Hirschegg, Austria, GSI ISSN 0720-8715