Charged-particle calorimetry of 40Ar + 27Al reactions from 36 to 65 MeV/u

Cussol, D.; Bizard, G.; Brou, R.; Durand, Dominique; Louvel, M.; Patry, J.P.; Péter, J.; Régimbart, R.; Steckmeyer, J.C.; Sullivan, J. P.; Tamain, B.; Crema, Eduardo; Doubre, H.; Hagel, K.; Jin, G.M.; Péghaire, A.; Saint‐Laurent, F.; Cassagnou, Y.; Légrain, R.; Lebrun, C.; Rosato, E.; MacGrath, R.; Jeong, S. C.; Lee, S.M.; Nagashima, Y.; Nakagawa, T.; Ogihara, Masahiro; Kasagi, J.; Motobayashi, T.

doi:10.1016/0375-9474(93)90155-q

Cited by 58 publications

(37 citation statements)

References 10 publications

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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.…”

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confidence: 99%

Critical behavior in light nuclear systems: Experimental aspects

G.¹,

Natowitz²,

Wada³

et al. 2005

Phys. Rev. C

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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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confidence: 99%

Critical behavior in light nuclear systems: Experimental aspects

G.¹,

Natowitz²,

Wada³

et al. 2005

Phys. Rev. C

Self Cite

102

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“…For each beam energy, the excitation energy of the initial composite system has been estimated using a standard calorimetric procedure [43][44][45], including the light charged particles detected in coincidence. The mean values are given in the upper scale of Fig.11.…”

Section: Discussionmentioning

confidence: 99%

Coulomb chronometry to probe the decay mechanism of hot nuclei

et al. 2015

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In129 Xe+ nat Sn central collisions from 8 to 25 MeV/A, the three-fragment exit channel occurs with a significant cross section. We show that these fragments arise from two successive binary splittings of a heavy composite system. The sequence of fragment production is determined. Strong Coulomb proximity effects are observed in the three-fragment final state. A comparison with Coulomb trajectory calculations shows that the time scale between the consecutive break-ups decreases with increasing bombarding energy, becoming quasi-simultaneous above excitation energy E * = 4.0±0.5 MeV/A. This transition from sequential to simultaneous break-up was interpreted as the signature of the onset of multifragmentation for the three-fragment exit channel in this system.

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“…There were, however, alternative explanations proposed for the observations, involving Fermi motion 1-17] or dynamical processes [18]. In results from kinetic-energy spectra, there is one indication of a plateau in the dependence of temperature on excitation energy [19], while Cussol et al [20] found the temperatures to rise progressively.…”

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confidence: 93%

Multifragmentation study on 30 AMeV32S+58Ni

Siwek¹,

Sourell

Budzanowski³

et al. 1995

Z. Physik A - Hadrons and Nuclei

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Abstract. In a multidetector experiment on 26 or 30 AMeV 32S + 5SNi, up to four coincident heavier or intermediate-mass fragments were observed. One of these occasionally has the characteristics of a projectile-like fragment, up to three may be attributed to the decay of the heavy reaction product. Taking the velocity of the fragments as a measure of the heavy-product excitation energy, one finds evaporation, fission and multifragmentation to follow one another with rising excitation. Model simulations of sequential decay with up to two binary fissions and, alternatively, of simultaneous statistical multifragmentation were performed for comparison with experimental distributions of mass, velocity and (for events with three slow intermediate-mass fragments) relative azimuthal angle. Though in the three-fragment events indications of simultaneous multifragmentation are present, the sequential binary decay predominates. Evaporated protons and c~ particles detected in coincidence have a mean multiplicity growing with excitation energy, while the temperature governing the spectra has a plateau with a value of about 5.5 MeV.

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Charged-particle calorimetry of 40Ar + 27Al reactions from 36 to 65 MeV/u

Cited by 58 publications

References 10 publications

Critical behavior in light nuclear systems: Experimental aspects

Critical behavior in light nuclear systems: Experimental aspects

Coulomb chronometry to probe the decay mechanism of hot nuclei

Multifragmentation study on 30 AMeV32S+58Ni

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