Pre-equilibrium emission of light composite particles in the framework of the exciton model

Sato, Keisuke; Iwamoto, Akira; Harada, K.

doi:10.1103/physrevc.28.1527

Cited by 65 publications

(43 citation statements)

References 8 publications

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“…GNASH uses phenomenological expressions by Kalbach [55,64] while EMPIRE employs the IwamotoHarada model [65] parameterized and improved in Refs. [66][67][68]. The latter model contains two essential features that increase production of composite particles during the equilibration stage:…”

Section: F Coupling Between Msc and Msd In Empirementioning

confidence: 99%

ENDF/B-VII.0: Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology

Chadwick

Obložinský

Herman

et al. 2006

Nuclear Data Sheets

1,930

908

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We describe the next generation general purpose Evaluated Nuclear Data File, ENDF/B-VII.0, of recommended nuclear data for advanced nuclear science and technology applications. The library, released by the U.S. Cross Section Evaluation Working Group (CSEWG) in December 2006, contains data primarily for reactions with incident neutrons, protons, and photons on almost 400 isotopes. The new evaluations are based on both experimental data and nuclear reaction theory predictions.The principal advances over the previous ENDF/B-VI library are the following: (1) New cross sections for U, Pu, Th, Np and Am actinide isotopes, with improved performance in integral validation criticality and neutron transmission benchmark tests; (2) More precise standard cross sections for neutron reactions on H, 6 Li, 10 B, Au and for 235,238 U fission, developed by a collaboration with the IAEA and the OECD/NEA Working Party on Evaluation Cooperation (WPEC); (3) Improved thermal neutron scattering; (4) An extensive set of neutron cross sections on fission products developed through a WPEC collaboration; (5) A large suite of photonuclear reactions; (6) Extension of many neutron-and proton-induced reactions up to an energy of 150 MeV; (7) Many new light nucleus neutron and proton reactions; (8) Post-fission beta-delayed photon decay spectra; (9) New radioactive decay data; and (10) New methods developed to provide uncertainties and covariances, together with covariance evaluations for some sample cases.The paper provides an overview of this library, consisting of 14 sublibraries in the same, ENDF-6 format, as the earlier ENDF/B-VI library. We describe each of the 14 sublibraries, focusing on neutron reactions. Extensive validation, using radiation transport codes to simulate measured critical assemblies, show major improvements: (a) The long-standing underprediction of low enriched U thermal assemblies is removed; (b) The 238 U, 208 Pb, and 9 Be reflector biases in fast systems are largely removed; (c) ENDF/B-VI.8 good agreement for simulations of highly enriched uranium assemblies is preserved; (d) The underprediction of fast criticality of 233,235 U and 239 Pu assemblies is removed; and (e) The intermediate spectrum critical assemblies are predicted more accurately.We anticipate that the new library will play an important role in nuclear technology applications, including transport simulations supporting national security, nonproliferation, advanced reactor and fuel cycle concepts, criticality safety, medicine, space applications, nuclear astrophysics, and nuclear physics facility design. The ENDF/B-VII.0 library is archived at the National Nuclear Data Center,

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Section: F Coupling Between Msc and Msd In Empirementioning

confidence: 99%

ENDF/B-VII.0: Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology

Chadwick

Obložinský

Herman

et al. 2006

Nuclear Data Sheets

1,930

908

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“…It has recently been demonstrated that the preequilibrium LCP emission can be described reasonably well by implementation of a surface a Presenting author, e-mail: watanabe@aees.kyushu-u.ac.jp coalescence mechanism in the INC model for nucleon-induced reactions at several hundreds of MeV to 2.5 GeV [11,12]. In the past, a similar coalescence idea was taken into account in the preequilibrium exciton model, and successfully applied to light-ion production in proton-induced reactions at incident energies below 100 MeV [13][14][15]. In the present work, we also implement such a phenomenological surface coalescence model into the QMD simulation [16].…”

Section: Introductionmentioning

confidence: 98%

“…Some modifications [16] have been made in the QMD calculation on the basis of the phenomenological prescriptions incorporated in the INC model by Letourneau et al [11] and Boudard et al [12], and the coalescence exciton model by Iwamoto et al [13,14] and Bisplinghoff [15].…”

Section: Phenomenological Surface Coalescence Modelmentioning

confidence: 99%

Extension of quantum molecular dynamics for production of light complex particles in nucleon-induced reactions

Watanabe

Kadrev

2007

Nd2007

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Abstract.A quantum molecular dynamics (QMD) model is applied to production of light charged particles in nucleon-induced reactions on several light and medium heavy nuclei. The generalized evaporation model (GEM) is used to deal with the statistical decay process of highly excited fragments at the end of the QMD stage. Good agreement with experimental double-differential cross sections is obtained for nucleon emission, but the calculation shows remarkable underprediction for preequilibrium emission of light complex particles, i.e., d, t, 3 He, and 4 He. To improve the situation, a phenomenological surface coalescence model is incorporated into the QMD simulation under the assumption that light complex particles are mainly formed near the surface region by a leading nucleon that is ready to escape from the nucleus during the dynamical process.

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“…The number of neutrons and protons for initial exciton state was calculated using realistic nucleon-nucleon interaction cross sections in nucleus [9]. The exciton coalescence pick-up model [11,12] and the knock-out model [13] were used for the description of the pre-equilibrium complex particle emission.…”

Section: Theoretical Predictionsmentioning

confidence: 99%

On the uncertainty in the nuclear model calculation of neutron and proton induced reaction cross sections

Mercatali

Konobeyev

Broeders

2007

Nd2007

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Abstract. The paper deals with the investigation of the uncertainty associated to the calculation of activation and transmutation cross sections for neutron and proton induced reactions. Results of the calculations performed by means of the TALYS code and the ALICE/ASH code with different models for the description of the nuclear level densities have been extensively compared with EXFOR experimental data. Statistical deviation factors quantifying the discrepancy between experimental and theoretical results have been obtained, which can be used to define appropriate models for the nuclear reaction cross section calculation for different mass range of target nuclei. Furthermore, experimental data have been also compared against the most modern nuclear data files in order to investigate the gain in accuracy one should expect from the evaluation work with respect to the data obtained via nuclear model calculation.

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Pre-equilibrium emission of light composite particles in the framework of the exciton model

Cited by 65 publications

References 8 publications

ENDF/B-VII.0: Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology

ENDF/B-VII.0: Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology

Extension of quantum molecular dynamics for production of light complex particles in nucleon-induced reactions

On the uncertainty in the nuclear model calculation of neutron and proton induced reaction cross sections

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