Distributions of the largest fragment charge, Zmax, in multifragmentation reactions around the Fermi energy can be decomposed into a sum of a Gaussian and a Gumbel distribution, whereas at much higher or lower energies one or the other distribution is asymptotically dominant. We demonstrate the same generic behavior for the largest cluster size in critical aggregation models for small systems, in or out of equilibrium, around the critical point. By analogy with the time-dependent irreversible aggregation model, we infer that Zmax distributions are characteristic of the multifragmentation time scale, which is largely determined by the onset of radial expansion in this energy range
Nuclear fragmentation time-scale and fluctuations of the largest fragment size / D., Gruyer; J. D., Frankland; R., Botet; M., Płoszajczak; E., Bonnet; A., Chbihi; B., Borderie; M. F., Rivet; E., Galichet; R., Roy; N., Le Neindre; R., Bougault; D., Guinet; P., Lautesse; P., Marini; P., Pawlowski; Rosato, Elio; Spadaccini, Giulio; Vigilante, Mariano; J. P., Wieleczko. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 110:(2013), pp. 1-6. [10.1103/PhysRevLett.110.172701]
Nuclear fragmentation time-scale and fluctuations of the largest fragment size
ROSATO, ELIO;SPADACCINI, GIULIO;VIGILANTE, MARIANO;
2013
Abstract
Distributions of the largest fragment charge, Zmax, in multifragmentation reactions around the Fermi energy can be decomposed into a sum of a Gaussian and a Gumbel distribution, whereas at much higher or lower energies one or the other distribution is asymptotically dominant. We demonstrate the same generic behavior for the largest cluster size in critical aggregation models for small systems, in or out of equilibrium, around the critical point. By analogy with the time-dependent irreversible aggregation model, we infer that Zmax distributions are characteristic of the multifragmentation time scale, which is largely determined by the onset of radial expansion in this energy rangeI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.