Evidence of critical behavior in the disassembly of nuclei with A$\sim$36

Y.G. Ma , R. Wada , K. Hagel , J. Wang , T. Keutgen , Z. Majka , M. Murray , L. Qin , P. Smith , J.B. Natowitz , R. Alfaro , J. Cibor , M. Cinausero , Y. El Masri , D. Fabris , E. Fioretto , A. Keksis , M. Lunardon , A. Makeev , Nathalie Marie (1) , E. Martin , A. Martinez-Davalos , A. Menchaca-Rocha , G. Nebbia , G. Prete , V. Rizzi , A. Ruangma , D.V. Shetty , G. Souliotis , P. Staszel , M. Veselsky , G. Viesti , E.M. Winchester , S.J. Yennello

1 LPCC - Laboratoire de physique corpusculaire de Caen

A wide variety of observables indicate that maximal fluctuations in the disassembly of hot nuclei with A$\sim$36 occur at an excitation energy of 5.6$\pm$0.5 MeV/nucleon and temperature of 8.3$\pm$0.5 MeV. Associated with this point of maximal fluctuations are a number of quantitative indicators of apparent critical behavior. The associated caloric curve does not appear to show a flattening such as that seen for heavier systems. This suggests that, in contrast to similar signals seen for liquid-gas transitions in heavier nuclei, the observed behavior in these very light nuclei is associated with a transition much closer to the critical point.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

Y.G. Ma, R. Wada, K. Hagel, J. Wang, T. Keutgen, et al.. Evidence of critical behavior in the disassembly of nuclei with A$\sim$36. Physical Review C, 2004, 69, 31604 (5 p.). ⟨10.1103/PhysRevC.69.031604⟩. ⟨in2p3-00024328⟩