Binary dissipative processes and formation of hot nuclei in reactions from 55 to 95 MeV/u

Péter, J.; Jeong, S. C.; Angélique, J. C.; Auger, G.; Bizard, G.; Brou, R.; Buţă, A.; Cabot, C.; Cassagnou, Y.; Crema, Eduardo; Cussol, D.; Durand, D.; Masri, Y. El; Eudes, P.; He, Zhi; Kerambrun, A.; Lebrun, C.; Légrain, R.; Patry, J.P.; Péghaire, A.; Régimbart, R.; Rosato, E.; Saint‐Laurent, F.; Steckmeyer, J.C.; Tamain, B.; Vient, E.

doi:10.1016/0375-9474(95)00317-t

Cited by 66 publications

(12 citation statements)

References 19 publications

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“…Earlier work on the reaction mechanisms of near symmetric collisions of nuclei in the 20 < A < 64 mass region at energies near the Fermi energy have demonstrated the essential binary nature of such collisions, even at relatively small impact parameters [33]. As a result, they prove to be very useful in preparing highly excited light nuclei with kinematic properties which greatly simplify the detection and identification of the products of their subsequent deexcitation [51].…”

Section: Experimental Setup and Event Selectionmentioning

confidence: 98%

Critical behavior in light nuclear systems: Experimental aspects

G.¹,

Natowitz²,

Wada³

et al. 2005

Phys. Rev. C

102

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An extensive experimental survey of the features of the disassembly of a small quasiprojectile system with A ∼ 36, produced in the reactions of 47 MeV/nucleon 40 Ar + 27 Al, 48 Ti, and 58 Ni, 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 ∼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 -scaling analysis for of the heaviest fragments exhibits a transition to = 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 τ ∼ 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 β, γ , and σ 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.

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Section: Experimental Setup and Event Selectionmentioning

confidence: 98%

Critical behavior in light nuclear systems: Experimental aspects

G.¹,

Natowitz²,

Wada³

et al. 2005

Phys. Rev. C

102

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“…projectile or spectator breakup 8,9,10,11,12,13,14,15,16,17,18 , the situation becomes less clear when one looks at more central reactions. In particular, it has been shown that the dissipative binary mechanism 19,20,21,22,23 contributes 95% or more of the reaction cross section 22,23 . Yet, as long as the sources are thermalized, it has been shown that a characteristic signature for phase coexistence can be extracted from the charge distributions 24,25 .…”

Section: Introductionmentioning

confidence: 99%

Multifragmentation at Intermediate Energy: Dynamics or Statistics?

Beaulieu

Phair

Moretto

et al. 1998

Advances in Nuclear Dynamics 4

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“…The axes aspect ratio of both the inset and the main diagram is the same so that the slope in both is the same. Figure 3 displays a collection of experimental data on E x /A and total energy dissipated in central HIR published in periodics during the last two decades [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Because energy dependence is crucial for our comparison from the figure are dropped all single-energy results.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

Constancy of energy partition in central heavy-ion reactions at intermediate energies

Basrak

Eudes

Zorić

et al. 2013

J. Phys.: Conf. Ser.

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Semiclassical transport simulation of nucleus-nucleus collisions for the range of incident energy from about the Fermi energy up to a few hundred MeV per nucleon evidences that the maximal excitation energy put into a nuclear system during the early compact stage of heavy-ion reaction is a constant fraction of the center-of-mass available energy of the system. Analysis of experimental data without presuming reaction mechanism dominating the collision process on the best corroborate the found constancy of energy partition in central heavy-ion reactions.

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Binary dissipative processes and formation of hot nuclei in reactions from 55 to 95 MeV/u

Cited by 66 publications

References 19 publications

Critical behavior in light nuclear systems: Experimental aspects

Critical behavior in light nuclear systems: Experimental aspects

Multifragmentation at Intermediate Energy: Dynamics or Statistics?

Constancy of energy partition in central heavy-ion reactions at intermediate energies

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