Evaluation of Neutron Cross Section of 27 Fission Product Nuclides Important for Fast Reactor

Iijima, Shungo; Nakagawa, Tsuneo; Kikuchi, Yasuyuki; Kawai, Masayoshi; Matsunobu, Hiroyuki; Maki, Koichi; Igarasi, S.

doi:10.3327/jnst.14.161

Cited by 8 publications

(5 citation statements)

References 15 publications

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“…[73]. While the data of Iijima et al [73] lie well above his measured values, the data of ENDF/B evaluation agrees well at higher energies but lie slightly below the experimental results for energy below 60 keV. Our calculations are in good agreement with those of Macklin [71], especially at higher energies.…”

Section: B Total Capture Cross Sectionssupporting

confidence: 76%

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Neutron capture reactions relevant to thesandpprocesses in the region of theN=50shell closure

2016

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Radiative thermal neutron capture cross sections for nuclei participating in s-process and pprocess nucleosynthesis in and around N = 50 closed neutron shell have been calculated in statistical semi-microscopic Hauser-Feshbach approach for the energy range of astrophysical interest. A folded optical-model potential is constructed utilizing the standard DDM3Y real nucleon-nucleon interaction. The folding of the interaction with target radial matter densities, obtained from the relativistic-mean-field approach, is done in coordinate space using the spherical approximation. The standard nuclear reaction code TALYS1.8 is used for cross-section calculation. The cross sections are compared with experimental results and reasonable agreements are found for almost all cases. Maxwellian-averaged cross sections (MACS) for the nuclei are presented at a single thermal energy of 30 keV relevant to s-process. We have also presented the MACS values over a range of energy from 5 to 100 keV for neutron magic nuclei with (N = 50).PACS numbers: I. INTRODUCTIONElements heavier than iron are produced via two principle processes, namely, the slow neutron capture process (s-process) and the rapid neutron capture process (r-process), differing in the respective neutron capture timescales with respect to the β-decay half-lives. There is a minor contribution from another process, namely, pprocess, producing a subset of proton-rich isotopes. The detailed study of the heavy element nucleosynthesis was done in the fundamental work of Burbidge et al. [1] and also of Cameron [2]. Recently Käppeler et al. [3] presented a review of progress on the studies of s-process nucleosynthesis with advanced nuclear physics inputs, observational data, and stellar models.While the majority of the theory of the s-process is well-developed, uncertainty still remains in constraining the neutron capture rates of nuclei involved in nucleosynthesis chain. The capture cross sections are highly scattered and uncertain in the energy range appropriate for astrophysical applications. These uncertainties lead to significant errors in determining exact abundances of elements involved in different processes. Many works * Electronic address: saumidutta89@gmail.com † Electronic address: ggphy@caluniv.ac.in ‡ Electronic address: abhattacharyyacu@gmail.com have been devoted to this respect in order to measure the thermal neutron capture cross sections relevant to s-process temperature. However, reactions on some important nuclei are still not available due to their unavailability in the terrestrial laboratory. Käppeler et al. [4] showed the present status of the uncertainty of stellar (n, γ) cross sections and commented that improvements are certainly necessary especially in the mass region below A=120 and above A=180. Some reactions are of significant importance, basically those with closed neutron shells acting as bottlenecks to the s-process reaction flow. They have very low cross-sections and in some scenarios, the s-process reaction flow cannot overcome these bottlen...

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Section: B Total Capture Cross Sectionssupporting

confidence: 76%

“…He compared their measurement with that of ENDF/B-V evaluation [72] and that of Ref. [73]. While the data of Iijima et al [73] lie well above his measured values, the data of ENDF/B evaluation agrees well at higher energies but lie slightly below the experimental results for energy below 60 keV.…”

Section: B Total Capture Cross Sectionsmentioning

confidence: 86%

Neutron capture reactions relevant to thesandpprocesses in the region of theN=50shell closure

2016

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“…The Isotopic compositions of the elemental Fe and Cr are dominated by one major isotope each ( 56 Fe, 91.7%, and 52 Cr, 83.8%) whereas for Ni two isotopes contribute larger amounts ( 58 Ni, 67.8%, and 60 Ni, 26.2%). All of these isotopes are in a mass range where the cross sections in the main region of the fast reactor spectrum show distinct resonances.…”

Section: Capture In Structural Coolant and Shielding Materialsmentioning

confidence: 96%

“…This Series does not supplant formal journal publication but it does provide the more extensive information required for technological applications (e.g., tabulated numerical data) in a timely manner. 56 Fe, 58 Ni, 60 Ni ane 61 The neutron radiative capture process plays an important role in many aspects of nuclear power reactors and the associated fuel cycles. Presently operated thermal reactors burn fissile nuclei ( 235 U, 239 Pu, and 233 U) with the main objective of electrical power generation.…”

Section: Nuclear Data and Measurements Seriesmentioning

confidence: 99%

“…S-wave resonances in this range are large and broad and therefore strongly selfshielded, whereas p-wave resonances are narrow and small, and less selfshielded. Figure 5 shows as an example the capture cross sections of 56 Fe, 58 Ni, 60 Ni and 61 Ni. The dominance of one or two isotopes in the isotopic composition of Fe, Cr, or Ni does not imply that the minor isotopes play a correspondingly unimportant role.…”

Section: Capture In Structural Coolant and Shielding Materialsmentioning

confidence: 99%

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Review of the neutron capture process in fission reactors

Poenitz¹

1981

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The importance of the neutron capture process and the status of the more important cross section data are revieved. The capture in fertile and fissile nuclei is considered. For thermal reactors the thermal to epithermal capture ratio for 238 U and 232 Th remains a problem though some improvements were made with more recent measurements. The capture cross section of 238 U in the fast energy range remains quite uncertain and a long standing discrepancy for the calculated versus experimental central reaction rate ratio C28/F49 persists. Capture in structural materials, fission product nuclei and the higher actinides is also considered.

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Nuclear data sheets update for a = 98

Singh

1992

Nuclear Data Sheets

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Evaluation of Neutron Cross Section of 27 Fission Product Nuclides Important for Fast Reactor

Cited by 8 publications

References 15 publications

Neutron capture reactions relevant to thesandpprocesses in the region of theN=50shell closure

Neutron capture reactions relevant to thesandpprocesses in the region of theN=50shell closure

Review of the neutron capture process in fission reactors

Nuclear data sheets update for a = 98

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