Two-component equilibration in the exciton model of nuclear reactions

Gupta, S. K.

doi:10.1007/bf01421531

Cited by 27 publications

(28 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This factor results from the reduction of a two-component master equation (i.e. with the neutron-proton distinction) to an effective one-component equation [70]. Taking also into account the direct reaction contribution, as mentioned above, one usually obtains a value of 1.1-1.6 for the mean free path parameter K mf p .…”

Section: Exciton Model (Pcross Code)mentioning

confidence: 99%

“…In the PCROSS code, the additional 3/8 factor introduced by Gupta [70] is taken into account on the r.h.s. of Eq.…”

Section: Exciton Model (Pcross Code)mentioning

confidence: 99%

“…The probability of emission W b (E, n, b ) of a nucleon b with spin s b , reduced mass µ b and energy b from a state with n excitons is given by, 6) where E(U ) is the excitation energy of the CN (residual nucleus), ω(p, h, U ) is the particlehole state density, and σ inv b ( b ) is the inverse channel reaction cross section. The factor Q b (p, h) takes into account the fraction of b nucleons in the n-th stage of the reaction and is calculated as discussed by Gupta [70].…”

Section: Exciton Model (Pcross Code)mentioning

confidence: 99%

See 2 more Smart Citations

EMPIRE-3.2 Malta modular system for nuclear reaction calculations and nuclear data evaluation Users Manual

Herman¹,

Capote²,

Sin³

et al. 2013

107

104

View full text Add to dashboard Cite

EMPIRE is a modular system of nuclear reaction codes, comprising various nuclear models, and designed for calculations over a broad range of energies and incident particles. The system can be used for theoretical investigations of nuclear reactions as well as for nuclear data evaluation work. Photons, nucleons, deuterons, tritons, helions ( 3 He), α's, and light or heavy ions can be selected as projectiles. The energy range starts just above the resonance region in the case of a neutron projectile, and extends up to few hundred MeV for heavy ion induced reactions. The code accounts for the major nuclear reaction models, such as optical model, Coupled Channels and DWBA (ECIS06 and OPTMAN), Multi-step Direct (ORION + TRISTAN), NVWY Multi-step Compound, exciton model (PCROSS), hybrid Monte Carlo simulation (DDHMS), and the full featured Hauser-Feshbach model including width fluctuations and the optical model for fission. Heavy ion fusion cross section can be calculated within the simplified coupled channels approach (CCFUS). A comprehensive library of input parameters based on the RIPL-3 library covers nuclear masses, optical model parameters, ground state deformations, discrete levels and decay schemes, level densities, fission barriers, and γ-ray strength functions. Effects of the dynamic deformation of a fast rotating nucleus can be taken into account in the calculations (BARFIT, MOMFIT).The results can be converted into the ENDF-6 format using the accompanying EM-PEND code. Modules of the ENDF Utility Codes and the ENDF Pre-Processing codes are applied for ENDF file verification. The package contains the full EXFOR library of experimental data in computational format C4 that are automatically retrieved during the calculations.EMPIRE contains the resonance module that retrieves data from the electronic version of the Atlas of Neutron Resonances by Mughabghab (not provided with the EMPIRE distribution), to produce resonance section and related covariances for the ENDF-6 formatted files. EMPIRE can be used to determine covariances of the calculated data using either sensitivity matrices along with the KALMAN code or employing Monte Carlo approach to produce model generated covariances. In both cases experimental data can be taken into account, either directly (KALMAN) or by feeding the EMPIRE calculated Monte Carlo modelling covariance as a prior to the least square fitting GANDR system. Publication quality graphs can be obtained using the powerful and flexible plotting package ZVView. Interactive plots with ZVView comparing experimental results with calculations can be produced with ENDVER modules.The backbone of the EMPIRE system are bash-shell UNIX scripts that provide for seamless console operation of EMPIRE on Linux, Mac OS X, and Microsoft Windows with GNU gfortran compiler installed. Additionally, the graphical interface, provides for an easy operation of the system on Linux, Mac OS X and virtual Linux machines running on Microsoft Windows. was implemented in the HMS-EMPIRE. This version also included combi...

show abstract

Section: Exciton Model (Pcross Code)mentioning

confidence: 99%

“…In the PCROSS code, the additional 3/8 factor introduced by Gupta [70] is taken into account on the r.h.s. of Eq.…”

Section: Exciton Model (Pcross Code)mentioning

confidence: 99%

Section: Exciton Model (Pcross Code)mentioning

confidence: 99%

See 1 more Smart Citation

EMPIRE-3.2 Malta modular system for nuclear reaction calculations and nuclear data evaluation Users Manual

Herman¹,

Capote²,

Sin³

et al. 2013

107

104

View full text Add to dashboard Cite

show abstract

“…9) or using a standard parameterization of the matrix elements. 10) In the case of double-differential spectra of particle emission, both prescriptions lead to similar results, but when trying to reproduce isotope production in typical spallation reactions, 11) the semi-microscopical transition probabilities. 9) produce better results.…”

Section: Pre-equilibriummentioning

confidence: 96%

Recent Developments in Pre-Equilibrium and De-Excitation Models in Geant4

Quesada

Ivanchenko

et al. 2011

Progress in Nuclear Science and Technology

View full text Add to dashboard Cite

Geant4 native pre-equilibrium and de-excitation models are used for sampling of residual nucleus fragmentation in a number of generators of inelastic hadron/ion interaction with nuclei including QGS, FTF, Binary Cascade, QMD and some others. The pre-compound model is responsible for pre-equlibrium emission of protons, neutrons and light ions. The de-excitation model provides sampling of evaporation of neutrons, protons and light fragments up to magnesium, Fermi break-up, statistical multifragmentation, fission and photon emission. Recently a review of the pre-equilibrium and de-excitation models of Geant4 has been performed and we report a summary of modifications introduced. The results of the validation versus various published data are presented.

show abstract

“…The factor 3/8 results from the reduction of a two-component master equation (i.e. with proton/neutron distinction) to an effective one-component equation [11]. It, for example, can be explained easily for the damping width F, (+) +.…”

Section: Smc-proeessesmentioning

confidence: 98%