CAS OpenIR  > 中科院上海应用物理研究所2004-2010年
Critical behavior in light nuclear systems: Experimental aspects
Ma, YG(马余刚); Natowitz, JB; Wada, R; Hagel, K; Wang, J; Keutgen, T; Majka, Z; Murray, M; Qin, L; Smith, P; Alfaro, R; Cibor, J; Cinausero, M; El Masri, Y; Fabris, D; Fioretto, E; Keksis, A; Lunardon, M; Makeev, A; Marie, N; Martin, E; Martinez-Davalos, A; Menchaca-Rocha, A; Nebbia, G; Prete, G; Rizzi, V; Ruangma, A; Shetty, DV; Souliotis, G; Staszel, P; Veselsky, M; Viesti, G; Winchester, EM; Yennello, SJ; Ma, YG (reprint author), Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA
2005
Source PublicationPHYSICAL REVIEW C
ISSN0556-2813
Volume71Issue:5
AbstractAn extensive experimental survey of the features of the disassembly of a small quasiprojectile system with A similar to 36, produced in the reactions of 47 MeV/nucleon Ar-40 + Al-27, Ti-48, and Ni-58, has been carried out. Nuclei in the excitation energy range of 1-9 MeV/nucleon have been investigated employing a new method to reconstruct the quasiprojectile source. At an excitation energy similar to 5.6 MeV/nucleon many observables indicate the presence of maximal fluctuations in the deexcitation processes. These include the normalized second moments of the Campi plot and normalized variances of the distributions of order parameters such as the atomic number of the heaviest fragment Z(max) and the total kinetic energy. The evolution of the correlation of the atomic number of the heaviest fragment with that of the second heaviest fragment and a bimodality test are also consistent with a transition in the same excitation energy region. The related phase separation parameter, S-p, shows a significant change of slope at the same excitation energy. In the same region a Delta-scaling analysis for of the heaviest fragments exhibits a transition to Delta = 1 scaling, which is predicted to characterize a disordered phase. The fragment topological structure shows that the rank-sorted fragments obey Zipf's law at the point of largest fluctuations, providing another indication of a liquid gas phase transition. The Fisher droplet model critical exponent tau similar to 2.3 obtained from the charge distribution at the same excitation energy is close to the critical exponent of the liquid gas phase transition universality class. The caloric curve for this system shows a monotonic increase of temperature with excitation energy and no apparent plateau. The temperature at the point of maximal fluctuations is 8.3 +/- 0.5 MeV. Taking this temperature as the critical temperature and employing the caloric curve information we have extracted the critical exponents beta,gamma, and sigma from the data. Their values are also consistent with the values of the universality class of the liquid gas phase transition. Taken together, this body of evidence strongly suggests a phase change in an equilibrated mesoscopic system at, or extremely close to, the critical point.
Subject AreaInstruments & Instrumentation ; Nuclear Science & Technology ; Physics
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000229440200043
Citation statistics
Cited Times:84[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/8262
Collection中科院上海应用物理研究所2004-2010年
Corresponding AuthorMa, YG (reprint author), Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA
Recommended Citation
GB/T 7714
Ma, YG,Natowitz, JB,Wada, R,et al. Critical behavior in light nuclear systems: Experimental aspects[J]. PHYSICAL REVIEW C,2005,71(5).
APA Ma, YG.,Natowitz, JB.,Wada, R.,Hagel, K.,Wang, J.,...&Ma, YG .(2005).Critical behavior in light nuclear systems: Experimental aspects.PHYSICAL REVIEW C,71(5).
MLA Ma, YG,et al."Critical behavior in light nuclear systems: Experimental aspects".PHYSICAL REVIEW C 71.5(2005).
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