Surface and collective effects in preequilibrium reactions

Kalbach, C.

doi:10.1103/physrevc.62.044608

Cited by 51 publications

(31 citation statements)

References 46 publications

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“…This is due to a wide spread collective excitation. 43,44) Similar observations were made in the calculations 6,45) of molybdenum and niobium. As in the case of molybdenum, we assumed a pseudo resonance at an excitation energy of 2.8 MeV for 75 As, which can substitute for the missing collective enhancement phenomenologically.…”

Section: Neutron Emission Spectrasupporting

confidence: 82%

Evaluation of Neutron Nuclear Data on Arsenic-75 for JENDL-4

Shibata¹,

Chiba²,

Ichihara³

et al. 2010

Journal of Nuclear Science and Technology

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Neutron nuclear data on 75 As have been evaluated for the evaluated nuclear data library JENDL-4 in the energy region from 10 À5 eV to 20 MeV. The thermal capture cross section was updated by considering recent measurements. The statistical model was applied to calculate the cross sections above the resolved resonance region. In the calculation, coupled-channel optical model parameters were used for neutrons. Pre-equilibrium and direct-reaction processes were taken into account in addition to the compound process. The present calculations are almost consistent with available experimental data. The measured leakage neutron spectrum is well reproduced by the presently evaluated data at 14 MeV.

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Section: Neutron Emission Spectrasupporting

confidence: 82%

Evaluation of Neutron Nuclear Data on Arsenic-75 for JENDL-4

Shibata¹,

Chiba²,

Ichihara³

et al. 2010

Journal of Nuclear Science and Technology

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“…[2,3] for Co, Ni, and Mo isotopes. However, a new version (0.72) of the TALYS code was used although the previous description regarding the choices for the optical model potential (OMP) [22], the direct reaction (using ECIS97 [23]), the level density model [24,25] including the damping of shell effects at high excitation energies, and especially the PE contributions with the two-component Exciton model using Kalbach systematics [26] and particle-hole state densities including surface effects [27,28] which depend on the type of projectile and the target mass [8] has been not altered for calculations that were performed in this work. The discrete level schemes are adopted from the RIPL-2 database [24].…”

Section: Global Approachmentioning

confidence: 99%

Fast-neutron induced pre-equilibrium reactions on 55Mn and 63,65Cu at energies up to 40 MeV

et al. 2008

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Excitation functions were measured for the 55 Mn(n,2n) 54 Mn, 55 Mn(n,α) 52 V, 63 Cu(n,α) 60 Co, 65 Cu(n,2n) 64 Cu, and 65 Cu(n,p) 65 Ni reactions from 13.47 to 14.83 MeV. The experimental cross sections are compared with the results of calculations including all activation channels for the stable isotopes of Mn and Cu, for neutron incident energies up to 50 MeV. Within the energy range up to 20 MeV the model calculations are most sensitive to the parameters related to nuclei in the early stages of the reaction, while the model assumptions are better established by analysis of the data in the energy range 20-40 MeV. While the present analysis has taken advantage of both a new set of accurate measured cross sections around 14 MeV and the larger data basis fortunately available between 20 and 40 MeV for the Mn and Cu isotopes, the need of additional measurements below as well as above 40 MeV is pointed out.

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“…The angular dependent part of the double differential cross sections for emission neutron, proton, deuteron, triton, helium and alpha are obtained from Kalbach phenomenological approach [8][9][10][11][12]. It is based on a systematical study of a wide variety of experimental data.…”

Section: And 615 Mev Are Given Inmentioning

confidence: 99%

“…It is, however, well known that for nuclear reactions involving projectiles and ejectiles with different particle numbers, mechanisms like stripping, pick-up and knock-out play an important role and these direct-like reactions are not covered by the exciton model. Therefore, Kalbach developed a phenomenological contribution for these mechanisms as shown in [8][9][10][11][12]. It has recently been shown [12,13] that the new method gives a considerable improvement over the older methods, but it seemed to consistently underpredict neutron-induced reaction cross sections.…”

Section: Introductionmentioning

confidence: 96%