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Phys. Rev. Lett. 80, 3928 - 3931 (1998)

Temperatures of Exploding Nuclei

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V. Serfling et al.
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Featured in Phys. Rev. Focus Received 17 December 1997

Breakup temperatures in central collisions of 197Au+197Au at bombarding energies E/A  =  50 to 200 MeV were determined with two methods. Isotope temperatures, deduced from double ratios of hydrogen, helium, and lithium isotopic yields, increase monotonically with bombarding energy from 5 to 12 MeV, in qualitative agreement with a scenario of chemical freeze-out after adiabatic expansion. Excited-state temperatures, derived from yield ratios of states in 4He, 5,6Li, and 8Be, are about 5 MeV, independent of the projectile energy, and seem to reflect the internal temperature of fragments at their final separation from the system.


©1998 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.80.3928
DOI: 10.1103/PhysRevLett.80.3928
PACS: 25.70.Pq, 21.65.+f, 25.70.Mn, 25.75.Ld

* Present address: Department of Physics, Yale University, New Haven, CT 06512.
† Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824.
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