Radiative capture cross sections for 14.7 MeV neutrons

Csikai, J.; Petö, G.; Buczko, M.; Miligy, Z.; Eissa, N. A.

doi:10.1016/0375-9474(67)90164-9

Cited by 68 publications

(4 citation statements)

References 12 publications

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“…The comparison of the calculated and experimental cross sections is shown in figure 1. The calculated cross section has a shape consistent with the experimental data [23][24][25], but the absolute cross section is slightly lower. A better reproduction of the data might be obtained with an appropriate adjustment of the V 1 and W 1 parameters of the Potokar particle-vibration coupling function.…”

Section: Capture Cross Sectionssupporting

confidence: 76%

Direct and semidirect radiative capture of nucleons with Hartree-Fock-BCS bound states

Bonneau

Kawano

Watanabe

et al. 2007

Nd2007

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Abstract. Nucleon radiative capture is one of the most important process for nucleo-synthesis calculations in astrophysics. The nucleon capture can occur in two different mechanisms: the compound reaction and the directsemidirect (DSD) process. The compound capture cross sections become very small when many neutron channels open because the neutron width becomes much larger than the γ width. For incident nucleon energies above about 5 MeV, the capture process can be described by the DSD theory only. In the DSD process, the incident particle is captured directly by an unoccupied bound state (direct) or it excites a collective state and is then scattered into a bound state (semidirect). In this picture, the calculation is sensitive to the radial wave functions of the bound state, which are often calculated with a single-particle model using a Wood-Saxon potential. For astrophysical calculations, since experimental information on nuclear structure is uncertain or inaccessible, we apply a Hartree-Fock-BCS (HFBCS) structure model to generate the radial wave functions. The DSD cross sections are obtained by calculating a transition amplitude to the HFBCS states and using the calculated spectroscopic factors. We calculate the neutron capture cross sections for even-even spherical and deformed targets, namely 208 Pb, 122,132 Sn and 238 U. The agreement with the experimental cross sections, only available for 208 Pb and 238 U, is very good.

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Section: Capture Cross Sectionssupporting

confidence: 76%

Direct and semidirect radiative capture of nucleons with Hartree-Fock-BCS bound states

Bonneau

Kawano

Watanabe

et al. 2007

Nd2007

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show abstract

“…The calculated cross section has a shape consistent with the experimental data [34][35][36], but the absolute cross section is slightly lower. A better reproduction of the data might be obtained with an appropriate adjustment of the V 1 and W 1 parameters of the Potokar particle-vibration coupling function.…”

Section: B Capture Cross Section For Spherical Targetssupporting

confidence: 66%

Nucleon direct-semidirect radiative capture with Skyrme-Hartree-Fock-BCS bound states

et al. 2007

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The nucleon direct-semidirect (DSD) capture cross sections are obtained by calculating a transition amplitude to the Hartree-Fock-BCS bound states. The radial matrix elements in the DSD amplitudes are calculated from the radial part of the single-particle wave functions. For deformed nuclei the single-particle states are expanded in the cylindrical harmonic-oscillator basis and then projected on the spherical harmonic-oscillator basis. The pairing correlations are treated in the BCS approach and the calculated spectroscopic factors are in fairly good agreement with experimental data in the even tin isotopes from 116 Sn to 124 Sn. The resulting DSD cross sections for the neutron capture by 208 Pb and 238 U are found to be in good agreement with the available experimental data. The calculations are also performed for the neutron capture on 122 Sn and 132 Sn isotopes that are important for the r-process in astrophysics.

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“…The relevant experimental knowledge of the Sc(n,?) cross sections is very limited and considerably discrepant [14][15][16][17][18][19]. All that can be reasonably concluded from these measurements is that the capture cross section is very small (few mbs) at energies of several-lO0 kev and is qualitatively consistent with that given in ENDF/B-VI except in the 0.5 -1.5 MeV region where the latter has a shape that was not reproduced by any of the calculations.…”

Section: Neutron Radiativecapturementioning

confidence: 99%