5,635 research outputs found
Do phase transitions survive binomial reducibility and thermal scaling?
First order phase transitions are described in terms of the microcanonical
and canonical ensemble, with special attention to finite size effects.
Difficulties in interpreting a "caloric curve" are discussed. A robust
parameter indicating phase coexistence (univariance) or single phase
(bivariance) is extracted for charge distributions.Comment: 10 pages, TeX type, psfig, also available at
http://csa5.lbl.gov/moretto/ps/lgm.ps, to appear in the Proceedings of the
1st Catania Relativistic Ion Studies: Critical Phenomena and Collective
Observables, Acicastello, May 27-31, 199
The Role of Phase Space in Complex Fragment Emission from Low to Intermediate Energies
The experimental emission probabilities of complex fragments by low energy
compound nuclei and their dependence upon energy and atomic number are compared
to the transition state rates. Intermediate-mass-fragment multiplicity
distributions for a variety of reactions at intermediate energies are shown to
be binomial and thus reducible at all measured transverse energies. From these
distributions a single binary event probability can be extracted which has a
thermal dependence. A strong thermal signature is also found in the charge
distributions. The n-fold charge distributions are reducible to the 1-fold
charge distributions through a simple scaling dictated by fold number and
charge conservation.Comment: 15 pages, TeX type, psfig, also available at
http://csa5.lbl.gov/moretto/ps/brazil.ps, to appear in Proceedings of the 1st
International Conference on Nuclear Dynamics at Long and Short Distances,
April 8-12, 1996, Angra dos Reis, Brazi
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