Radiative capture of fast neutrons by 165Ho and 238U

McDaniels, D.K.; Varghese, P.; Drake, D. M.; Arthur, E.D.; Lindholm, A.; Bergqvist, I.; Krumlinde, J.

doi:10.1016/0375-9474(82)90306-2

Cited by 22 publications

(7 citation statements)

References 17 publications

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“…In their calculations McDaniels et al [15] adopted similar particle-vibration coupling parameters but obtained systematically lower results, for example 0.7 mb at 12 MeV, which is 40 to 50% lower than in our calculations. They attributed this underestimate to the direct part of the cross section.…”

Section: Capture Cross Section For the Deformed Target 238 Ucontrasting

confidence: 73%

“…The procedure outlined by Boisson-Jang was then followed by several studies [13][14][15] to reproduce experimental capture cross sections for deformed nuclei. We recall it below to establish our notation.…”

Section: A Direct-semidirect Cross Sectionmentioning

confidence: 99%

“…The GDR parameters are taken from Caldwell et al [45] and the coupling strength was the same as the 208 Pb calculation, namely V 1 = 75 and W 1 = 140 MeV. Figure 8 shows a comparison of the calculated DSD cross section obtained using SLy4 (solid line) and SIII (dashed line) deformed bound states with the experimental data [15,35].…”

Section: Capture Cross Section For the Deformed Target 238 Umentioning

confidence: 99%

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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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Section: Capture Cross Section For the Deformed Target 238 Ucontrasting

confidence: 73%

Section: A Direct-semidirect Cross Sectionmentioning

confidence: 99%

Section: Capture Cross Section For the Deformed Target 238 Umentioning

confidence: 99%

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

et al. 2007

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“…The GDR parameters are taken from Caldwell et al [32]. Figure 3 shows a comparison of the calculated DSD cross section obtained using SLy4 (solid line) and SIII (dashed line) deformed bound states with the experimental data [11,24]. The use of SLy4 bound states gives a slightly better agreement with measurements.…”

Section: Capture Cross Sectionsmentioning

confidence: 84%

“…The procedure outlined by Boisson-Jang was then followed by several studies [9][10][11] to reproduce experimental capture cross sections for deformed nuclei.…”

Section: Direct-semidirect Cross Sectionmentioning

confidence: 99%

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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