Eur. Phys. J. A (2000) 8: 355-360
https://doi.org/10.1007/s100500070087

Nuclear temperature measurements with the double isotope ratio technique: Influence of the experimental conditions

¹ Dipartimento di Fisica dell’Università di Trieste and INFN, Sezione di Trieste, Italy
² Dipartimento di Fisica dell’Università di Bologna and INFN, Sezione di Bologna, Italy
³ INFN, Sezione di Bari, Italy
⁴ Laboratori Nazionali di Legnaro, INFN, Sezione di Bari, Italy
⁵ INFN, Sezione di Milano, Italy

^* e-mail: milazzo@trieste.infn.it

Received: 6 October 1999
Revised: 6 March 2000
Published online: 15 September 2000

Abstract

The dependence of the nuclear temperatures of highly excited systems, extracted by means of the double ratios of the emitted isotopes, on the experimental conditions is investigated. Experimental data obtained in the Xe+Cu 30 MeV/nucleon reaction are used to study the sensitivity of the method and the effects of the energy thresholds on the obtained temperature values. We find that the temperatures extracted using the He/Li ratios can be strongly influenced by the experimental energy thresholds which are different for different elements. These distortions depend on the velocity of the emitting system and on the detection angle and therefore particular care is needed in the choice of the detectors in those experiments in which velocities are low and angles are large. The use of four isotopes of the same element make negligible such effects.