Monte Carlo Simulation for Particle and γ-Ray Emissions in Statistical Hauser-Feshbach Model

Kawano, Toshihiko; Talou, P.; Chadwick, M.B.; Watanabe, Takehito

doi:10.3327/jnst.47.462

Cited by 36 publications

(45 citation statements)

References 27 publications

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“…The calculations must include feeding to the ground state as well as unobserved transitions to higher energy states. The method we used is similar to the Cascading Gamma Model (CGM) developed by Kawano et al [25] and successfully applied to calculate delayed neutron spectra [26].…”

Section: Fig 5 Experimental Decay Scheme Ofmentioning

confidence: 99%

β-decay study of neutron-rich bromine and krypton isotopes

Miernik¹,

Rykaczewski²,

Grzywacz³

et al. 2013

Phys. Rev. C

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Section: Fig 5 Experimental Decay Scheme Ofmentioning

confidence: 99%

β-decay study of neutron-rich bromine and krypton isotopes

Miernik¹,

Rykaczewski²,

Grzywacz³

et al. 2013

Phys. Rev. C

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“…Hence, uncertainties on nuclear data needed for fast reactors are large, given that even in the well known thermal power reactors, the local γ heating can be under predicted by up to 30% [6]. The model used in this paper, based on a Monte-Carlo implementation [7,8] of the statistical theory of Hauser and Feshbach [9], has a range of applicability well beyond thermal incident energies. However, in this paper, we study in detail the thermal-neutron induced fission of 235 U and 239 Pu, and the spontaneous fission of 252 Cf, where precise experimental data are available for comparison and benchmarking.…”

mentioning

confidence: 99%

Properties of prompt-fissionγrays

et al. 2014

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In a Monte-Carlo Hauser-Feshbach statistical framework, we describe spectra, average multiplicities, average energy and multiplicity distributions of the prompt γ rays produced in the thermal neutron-induced fission of 235 U and 239 Pu, and the spontaneous fission of 252 Cf. Comparisons against recent experimental data show reasonable agreement in all cases investigated, after adjustment of the initial spin distribution in the fission fragments. In particular, when we include in the calculation the Doppler broadening we obtain a qualitatively good description of the measured low-energy spectra, where contributions from collective discrete transitions in specific fragments can be identified. At higher energies, both the calculated neutron and γ-ray spectra are softer than experimental data. The impact of selected model parameters on the prompt neutron and γ-ray spectra is analyzed. Finally, we present prompt γ spectrum and multiplicity distribution for the neutron-induced fission of 235 U for 5.5 MeV neutron incident energy, just below the threshold for second-chance fission.

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“…A calculation at various neutron energies of all the possible reaction paths using the code CoH 3 [22] predicts the production cross sections for each channel in Fig. 12.…”

Section: Discussionmentioning

confidence: 99%

Feeding of Rh and Ag isomers in fast-neutron-induced reactions

et al. 2016

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Background: In (n, n ′ ) reactions on stable Ir and Au isotopes in the mass A = 190 region the experimentally established feeding of the isomers relative to the feeding of the corresponding ground states increases with increasing neutron energy up to the neutron energy where the (n, 2n) reaction channel opens up and then decreases.Purpose: In order to check for similar behavior in the mass A = 100 region the feeding of isomers and ground states in fast-neutron-induced reactions on stable isotopes in this mass region was studied. This is of especial interest for Rh which can be used as a radiochemical detector.Methods: Excited states were studied using the (n, n ′ γ), (n, 2nγ) and (n, 3nγ) reactions on 103 Rh and 109 Ag. A germanium-detector array for γ-ray detection and the broad-spectrum pulsed neutron source of the Los Alamos Neutron Science Center's Weapons Neutron Research facility were used for the measurement. The energy of the incident neutrons was determined using the time-of-flight technique.Results: Absolute partial γ-ray cross sections were measured for 57 transitions feeding isomers and ground states in 101,102,103 Rh and 107,108,109 Ag. The feeding of the isomers was found to be very similar in the corresponding reaction channels and it is compared to the feeding determined for the ground states. Conclusions:The opening of reaction channels at higher neutron energies removes angular momentum from the residual nucleus and reduces the population of the higher-spin isomers relative to the feeding of the lower-spin ground states. Similar behavior was observed in the mass A = 190 region in the feeding of higher-spin isomers, but the reverse behavior was observed in 176 Lu with a lower-spin isomer and a higher-spin ground state.PACS numbers: PACS number(s): 25.40.-h, 28.20.-v, 24.10.-i, 25.40.Fq * fotia@lanl.gov 2

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Monte Carlo Simulation for Particle and γ-Ray Emissions in Statistical Hauser-Feshbach Model

Cited by 36 publications

References 27 publications

β-decay study of neutron-rich bromine and krypton isotopes

β-decay study of neutron-rich bromine and krypton isotopes

Properties of prompt-fissionγrays

Feeding of Rh and Ag isomers in fast-neutron-induced reactions

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