Search for a Phase Transition in Nuclear Matter for Temperatures up to 7 MeV
The study of hot and heavy nuclei with temperatures between about 5 and 7 MeV presents an unquestionable interest: Hartree-Fock1 calculations as well as Thomas-Fermi2 calculations predict a limit in the temperature that a heavy nucleus (A-150) could sustain within this range. A liquid-gas phase transition for hot nuclear matter could also occur within this temperature range. The idea of a phase transition in nuclear matter arose initially from the van der Waals-like behavior of the nuclear force3. Recently, a caloric curve, built with a temperature scale derived from the yield ratios of He and Li isotopes, has been reported4 and exhibits the characteristic shape expected for such a transition with a plateau at a constant temperature T = 5 MeV for excitation energies per nucleon between about 2.5 and 10 MeV. In the present contribution, a signature of such a phase transition is searched for (but not found) in the energy spectra of the light charged particles emitted by strongly heated nuclear matter.
KeywordsNuclear Matter Alpha Particle Apparent Temperature Light Charged Particle Level Density Parameter
Unable to display preview. Download preview PDF.
- 1.P. Bonche, S. Levit and D. Vautherin, Nucl. Phys. A436 (1985) 265; S. Levit and P. Bonche, Nucl. Phys. A437 (1985) 426Google Scholar
- 3.H. Jaqaman et al., Phys. Rev. C27 (1983) 2782; J. Kapusta, Phys. Rev. C29 (1984) 1735Google Scholar
- 4.J. Pochodzalla et al., Phys. Rev. Lett. 75 (1995) 1040Google Scholar
- 6.S. Bresson et al., Phys. Lett. B294 (1992) 33; S. Bresson, Ph. D. Thesis, Univ. Caen (1993)Google Scholar
- 8.J.F. Lecolley et al., Phys. Lett. B325 (1994) 317Google Scholar
- 9.B.M. Quednau et al., Phys. Lett. B309 (1993) 10Google Scholar
- 10.J. Wilczynski, Phys. Lett. B47 (1973) 484Google Scholar
- 11.S. Schlomo and J.B. Natowitz, Phys. Rev. C44 (1991) 2878Google Scholar