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Experimental liquid-gas phase transition signals and reaction dynamics

Journal Article · · Physical Review C
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Texas A & M Univ., College Station, TX (United States); DOE/OSTI
  2. Sichuan Univ., Chengdu (China)
  3. Shaanxi Normal Univ., Xi'an (China)
  4. Chinese Academy of Sciences, Lanzhou (China)
  5. Inner Mongolia Univ. for Nationalities, Tongliao (China)
  6. Xingyi Normal Univ. for Nationalities (China)
  7. Texas A & M Univ., College Station, TX (United States)
+ Show Author Affiliations
The experimental liquid-gas phase transition signals are examined for the quasiprojectile (QP) reconstructed from the reactions of 40Ar + 27Al, 48Ti, 58Ni at 47 MeV/nucleon, using measures of caloric curve, multiplicity derivative, moment parameters, and fluctuation of maximum fragment charge number (NVZ). The QP source is reconstructed, using moving source parametrizations on an event-by-event basis. For the determination of the temperature, a quadrupole fluctuation thermometer is used. Deuterons are chosen for the thermometer to minimize the Coulomb and secondary sequential decay effects. Here, a new event-by-event method is proposed for the thermometer to determine the temperature. All measures show a characteristic signature around the temperature T = 9.0 ± 0.4 MeV, which may suggest that the QP system goes into the liquid-gas phase transition at Tc = 8.3 ± 0.4 MeV after the Coulomb correction.
Research Organization:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
National Natural Science Foundation of China; USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
FG02-93ER40773
OSTI ID:
1610244
Alternate ID(s):
OSTI ID: 1495066
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 99; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (14)

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
low & intermediate energy heavy-ion reactions
nuclear fragmentation
nuclear reactions
physics