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Paper IPM / Physic / 6856  


Abstract:  
The free energy of an alpha particle is calculated using the local
density approximation in the harmonic oscillator basis. The
effective twobody interactions are generated from the lowest
order constrained variational (LOCV) calculation for nuclear
matter at finite temperature, with the Reid and DeltaReid
potentials. The Fermi?Dirac distribution is used to calculate the
entropy and the occupation probability of each state of alpha
particle at a given temperature. The effective mass is treated as
a variational parameter. Our zero temperature results with the
DeltaReid interaction agree well with the experimental saturation
data of alpha particle and the other manybody techniques. The
flashing temperature of 5 MeV is found, which is consistent with
experimental evidence. It is concluded that a similar liquid?gas
phase transition to that of nuclear matter is most probable in the
alpha particle and heavier nuclei.
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