Formation and Emission of Light particles in Fast Neutron Induced Reaction—A Unified Compound Pre-Equilibrium Model(2)

Zhang, Jingshang; Yuan-qi, Wen; Shunuan, Wang; Xiangjun, Shi

doi:10.1088/0253-6102/10/1/33

Cited by 16 publications

(2 citation statements)

References 1 publication

(4 reference statements)

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“…One can find them in Refs. [4] and [16]. The results of the formation probabilities for a, cf, 3 He, t are shown in Fig.…”

Section: Formation and Emission Of Light Particle Based On The Pick-u...mentioning

confidence: 98%

The Angular Distribution of Light Particle Projectile Based on a Semi-Classical Model

Zhang

1990

Commun. Theor. Phys.

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A semi-classical model of multi-step direct and compound nuclear reactions is proposed to describe the angular distributions of the light particle projectiles from reaction processes induced by a nucleon with energies of several tens of MeV. The exact closed solution to the time-dependent master equation of the exciton model is applied. Based on the Fermi gas model, the scattering kernal between two-nucleon collision includes the influences of the Fermi motion and the Pauli exclusion principle, which give the significant improvement to rise of the backward distributions. The energy-angular correlation for the first few steps of the collision process (muli-step direct process) yields the further improvement of the angular distribution. The pick-up mechanism is employed to describe the composite particle emission. This reasonable physical picture reproduces the experimental data of the energy spectra of the composite particles satisfactorily. The angular distribution of the emitted composite particle is determined by an angular factor in terms of the momentum conservation of the nucleons forming the composite cluster. The generalized master equation is employed for the multi-step compound process. Thus a classical approach has been establised to calculate the double differential cross sections for all kinds of particles emitted in multi-step nucler reaction processes.

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“…One can find them in Refs. [4] and [16]. The results of the formation probabilities for a, cf, 3 He, t are shown in Fig.…”

Section: Formation and Emission Of Light Particle Based On The Pick-u...mentioning

confidence: 98%

The Angular Distribution of Light Particle Projectile Based on a Semi-Classical Model

Zhang

1990

Commun. Theor. Phys.

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“…where E is the excitation energy, £ is the energy of emitted particle, o 3 a * stands for the absorption cross section in Jv channel, Tjf' (n, E, S) is the T factor of emitted particle 6 with excitation energy E at n exciton state in J-K channel, Tj*{n, E) is the total T factor, which is given by 7?>, E) = J2 h^{n, E, S)dE ,…”

Section: The Energy Spectrum Formula Readsmentioning

confidence: 99%

A Semiclassical Theory of Multistep Nuclear Reaction Processes

Zhang

1992

Commun. Theor. Phys.

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The master equation theory of precompound and compound nuclear reactions has been generalized with inclusion of the conservation of angular momentum and parity. This improved semiclassical theory has been extended for application as an evaluation tool of the calculations of nucleon induced reaction cross sections and double differential cross sections. For structural materials at incident neutron energies below , it is demonstrated that the constructed model contains the Hauser-Feshbach, Weisskopf-Ewing as well as the exciton models as limiting cases. The unified treatment of pre-equilibrium processes includes a number of interesting features, such as the exciton state densities with the exact Pauli exclusion correction which are renormalized to the back-shifted Fermi-gas formula, the introduction of formation factors of composite particle in calculations of pick-up type composite particle emission and the double differential cross sections (DDCS) for all kinds of particles in terms of the leading particle model.

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