673 research outputs found
Resilient Reducibility in Nuclear Multifragmentation
The resilience to averaging over an initial energy distribution of
reducibility and thermal scaling observed in nuclear multifragmentation is
studied. Poissonian reducibility and the associated thermal scaling of the mean
are shown to be robust. Binomial reducibility and thermal scaling of the
elementary probability are robust under a broad range of conditions. The
experimental data do not show any indication of deviation due to averaging.Comment: 5 pages, 6 figures, submitted to Physical Review
Statistical Exploration of Fragmentation Phase Space Source Sizes in Nuclear Multifragmentation
The multiplicity distributions for individual fragment Z values in nuclear
multifragmentation are binomial. The extracted maximum value of the
multiplicity is found to depend on Z according to m=Z_0/Z, where Z_0 is the
source size. This is shown to be a strong indication of statistical coverage of
fragmentation phase space. The inferred source sizes coincide with those
extracted from the analysis of fixed multiplicity charge distributions.Comment: 13 pages, 4 revised figures, some revised tex
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 resistible effects of Coulomb interaction on nucleus-vapor phase coexistence
We explore the effects of Coulomb interaction upon the nuclear liquid vapor
phase transition. Because large nuclei (A>60) are metastable objects, phases,
phase coexistence, and phase transitions cannot be defined with any generality
and the analogy to liquid vapor is ill-posed for these heavy systems. However,
it is possible to account for the Coulomb interaction in the decay rates and
obtain the coexistence phase diagram for the corresponding uncharged system.Comment: 5 pages, 5 figure
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