Thermal scaling (Arrhenius law for an "elementary'' probability p of binomial function) and reducibility in intermediate mass fragments (IMF's) production are examined for data of the reaction Xe-129 + Sn-nat at 50 MeV/u. The study of the longitudinal velocities and of the average transverse energies of the IMF's contradicts the assumption that the total transverse energy of all detected particles E-t is related to a well defined temperature. The separation of E-t into the total transverse energy of light charged particles (Z = 1,2) and that of IMF's elucidates the algorithm which induces a linear behavior of log(l/p) versus 1/root E-t. Even in the case of a single thermalized source, calculations based on a sequential statistical model show that the Arrhenius law cannot be observed if E-t is taken as an estimation of the thermal energy. (C) 1998 Elsevier Science B.V. All rights reserved.
Is reducibility in nuclear multifragmentation related to thermal scaling?
POLITI, Giuseppe;
1998-01-01
Abstract
Thermal scaling (Arrhenius law for an "elementary'' probability p of binomial function) and reducibility in intermediate mass fragments (IMF's) production are examined for data of the reaction Xe-129 + Sn-nat at 50 MeV/u. The study of the longitudinal velocities and of the average transverse energies of the IMF's contradicts the assumption that the total transverse energy of all detected particles E-t is related to a well defined temperature. The separation of E-t into the total transverse energy of light charged particles (Z = 1,2) and that of IMF's elucidates the algorithm which induces a linear behavior of log(l/p) versus 1/root E-t. Even in the case of a single thermalized source, calculations based on a sequential statistical model show that the Arrhenius law cannot be observed if E-t is taken as an estimation of the thermal energy. (C) 1998 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
