Refinements of the nucleon-exchange transport model for the emission of hard photons and nucleons

Luke, S J; Vandenbosch, R.; Randrup, J.

doi:10.1103/physrevc.48.857

Cited by 19 publications

(7 citation statements)

References 39 publications

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“…A similar approach has been developed by us, where we have shown that the model, with the inclusion of (i) dynamically changing diffused momentum distribution to take into account the instantaneous excitations of the reactants, and (ii) two body collision which becomes more and more important with the increase of energy, has been quite successful in explaining preequilibrium neutron [13] as well as proton [14] emission spectra. Similar refinements have also been made by Luke et al [15], to explain the preequilibrium proton spectra. In addition to explaining the preequilibrium nucleon emission, our model has been able to explain other important features of incomplete fusion process, i.e., incomplete transfer of linear momentum [16] and angular momentum [17], saturation of excitation energy deposition [16] and entrance channel dependence of the residual velocity of the incompletely fused composite [18].…”

Section: Introductionmentioning

confidence: 61%

Entrance channel effects on preequilibrium emission and incomplete fusion in Promptly Emitted Particle model

Datta

Krishan

Bhattacharya

1995

Z. Physik A - Hadrons and Nuclei

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Abstract. In intermediate energy heavy ion collision promptparticles emitted in the early stages of the reaction affect the properties of the incompletely fused composite. We have studied the entrance channel effects on preequilibrium proton emission and various observables, like temperature, residual velocity, and linear momentum transfer of the incompletely fused residue, in the framework of Promptly Emitted Particle (PEP) model. The calculated preequilibrium proton energy spectra for Oxygen and Sulphur induced reactions on various targets have been confronted with the respective experimental data and the agreement between the two has been found to be quite satisfactory. Proton multiplicity has been found to decrease/increase with the increase in target/projectile mass. Residual velocity and linear momentum transfer have been found to have weak dependance on target mass. With the increase in incident energy, the calculation predicts a tendency towards limiting the temperature of the residue for all the target masses. The limiting temperature has been found to decrease with increase in the mass of the residue which is in accordance with the experimental observations. PACS: 25.70.Jj

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Section: Introductionmentioning

confidence: 61%

Entrance channel effects on preequilibrium emission and incomplete fusion in Promptly Emitted Particle model

Datta

Krishan

Bhattacharya

1995

Z. Physik A - Hadrons and Nuclei

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“…The model provides an excellent reproduction of the impact parameter dependence of the multiplicity, and a reasonable reproduction of the absolute magnitude considering that it is an a priori model without adjustable parameters. A comparison of the calculated and experimental energy spectra at difFerent angles is presented elsewhere [31].…”

Section: B Comparison With Other Experimentsmentioning

confidence: 99%

Impact parameter dependence of preequilibrium particle emission

Prindle¹,

Vandenbosch²,

Kailas³

et al. 1993

Phys. Rev. C

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The energy spectra and angular distributions of protons, deuterons, tritons, and alpha particles from 215 MeV 0 bombardment of Tb, Ta, and Au have been measured in coincidence with both evaporation residues and fission fragments. The evaporation residue and fission fragment triggers together with the angular momentum dependence of the evaporation residue-fission competition have enabled us to extract the impact parameter dependence of the light charged particle preequilibrium multiplicities within the fusionlike impact parameter domain. The light charged particle spectra can be parametrized as originating from a source with approximately 1/2 to 2/3 of the beam velocity and with a slope parameter of 5 -7 MeV. The proton multiplicities increase with decreasing impact parameter, in agreement with a nucleon exchange transport model prediction. The ratio of the complex particle to proton multiplicities decrease with decreasing impact parameter, suggesting dynamical effects in the complex particle production mechanism. PACS number(s): 25.70.z, 25.70.Jj, 25.70.Pq

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“…The first calculation was a modification of the nucleon-exchange transport model used for heavy ion interactions [3]. This model assumes that the γ rays are produced by nucleon-nucleon bremsstrahlung, specifically proton-neutron bremsstrahlung.…”

Section: Calculationsmentioning

confidence: 99%

“…The argument for this motivation is as follows. If the production mechanism for high energy γ rays in heavy-ion experiments is nucleon-nucleon bremsstrahlung, then the (p,γ) reaction producing γ rays above the GDR (Giant Dipole Resonance) should serve as a check of such bremsstrahlung mechanisms [3]. If the mechanism is uncontaminated by competing mechanisms then (p,γ) reactions could serve as a calibration of the bremsstrahlung mechanism in other reactions.…”

Section: Introductionmentioning

confidence: 99%