Multistep direct reaction analysis of continuum spectra in reactions induced by light ions

Tamura, T.; Udagawa, T.; Lenske, H.

doi:10.1103/physrevc.26.379

Cited by 217 publications

(120 citation statements)

References 49 publications

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“…However, it is insufficient to explain the cross sections at large angles [1,2,3]. Various groups [3,4] introduced multistep direct processes to compensate for the lack of cross sections in these regions.…”

Section: Introductionmentioning

confidence: 99%

“…Various groups [3,4] introduced multistep direct processes to compensate for the lack of cross sections in these regions. They calculated angular distributions of the two-step [3] and three-step direct processes [4] and found that multistep direct processes contribute significantly towards the understanding of nucleon induced intermeditate energy reactions.…”

Section: Introductionmentioning

confidence: 99%

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Two-step contribution to the spin-longitudinal and spin-transverse cross sections of the quasielastic(p,n)reactions

Nakaoka¹

2002

Phys. Rev. C

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The two-step contribution to the spin-longitudinal and the spin-transverse cross sections of 12 C, 40 Ca(p,n) reactions at 494 MeV and 346 MeV is calculated. We use a plane-wave approximation and evaluate the relative contributions from the one-step and the two-step processes. We found that the ratios of the two-step to the one-step processes are larger in the spin-transverse cross sections than in the spin-longitudinal ones. Combining these results with the distorted-wave impulse approximation (DWIA) results we obtained considerable two-step contributions to the spin-longitudinal and the spin-transverse cross sections. The two-step processes are important in accounting for the underestimation of the DWIA results for the spin-longitudinal and the spintransverse cross sections.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-step contribution to the spin-longitudinal and spin-transverse cross sections of the quasielastic(p,n)reactions

Nakaoka¹

2002

Phys. Rev. C

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“…A realistic treatment of the spin distribution should improve the accuracy of calculations of γ-ray production cross sections with the statistical Hauser-Feshbach model including the pre-equilibrium reaction mechanism. There are several well-known statistical multistep direct (MSD) theories: Feshbach, Kerman, and Koonin [6] (FKK), Tamura, Udagawa, and Lenske [7] (TUL), and Nishioka, Weidenmüller, and Yoshida [8] (NWY). These theories employ different statistical assumptions for the multistep reactions.…”

Section: Introductionmentioning

confidence: 99%

Neutron induced inelastic cross-sections of 150Sm for En=1–35MeV

Dashdorj

Mitchell

Kawano

et al. 2007

Nuclear Instruments and Methods in Physics Research Section B:

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Cross-section measurements were made of prompt gamma-ray production as a function of incident neutron energy (E n = 1 to 35 MeV) on an enriched (95.6%) l50 Sm sample. Energetic neutrons were delivered by the Los Alamos National Laboratory spallation neutron source located at the Los Alamos Neutron Science Center (LANSCE) facility. The prompt-reaction gamma rays were detected with the large-scale Compton-suppressed Germanium Array for Neutron Induced Excitations (GEANIE). Neutron energies were determined by the time-of-flight technique. The γ-ray excitation functions were converted to partial γ-ray cross sections taking into account the dead-time correction, target thickness, detector efficiency and neutron flux (monitored with an in-line fission chamber). Partial γ-ray cross sections were predicted using the equilibrium neutron-induced reactions was calculated using the quantum mechanical theory of Feshbach, Kerman, and Koonin (FKK). These pre-equilibrium spin distributions were incorporated into a new version of GNASH and the γ-ray production cross sections were calculated and compared with experimental data. The difference in the partial γ-ray cross sections using spin distributions with and without pre-equilibrium effects is discussed.

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“…In the nuclear reaction code EMPIRE [1] the approach to direct inelastic scattering to the continuum, as incorporated in the modules TRISTAN and ORION, is based upon the MSD quantum theory of pre-equilibrium processes originally formulated by Tamura, Udagawa and Lenske [3] (TUL) and extended with respect to statistical and dynamic treatment of nuclear structure [4]. The ORION module calculates one-and two-step cross sections with average state-independent formfactors.…”

Section: Introductionmentioning

confidence: 99%

Deformation dependent TUL multi-step direct model

Wienke

Capote

Herman

et al. 2007

Nd2007

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Abstract. The Multi-Step Direct (MSD) module TRISTAN in the nuclear reaction code EMPIRE has been extended to account for nuclear deformation. The new formalism was tested in calculations of neutron emission spectra emitted from the 232 Th(n,xn) reaction. These calculations include vibration-rotational Coupled Channels (CC) for the inelastic scattering to low-lying collective levels, "deformed" MSD with quadrupole deformation for inelastic scattering to the continuum, Multi-Step Compound (MSC) and Hauser-Feshbach with advanced treatment of the fission channel. Prompt fission neutrons were also calculated. The comparison with experimental data shows clear improvement over the "spherical" MSD calculations and JEFF-3.1 and JENDL-3.3 evaluations.

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Multistep direct reaction analysis of continuum spectra in reactions induced by light ions

Cited by 217 publications

References 49 publications

Two-step contribution to the spin-longitudinal and spin-transverse cross sections of the quasielastic(p,n)reactions

Two-step contribution to the spin-longitudinal and spin-transverse cross sections of the quasielastic(p,n)reactions

Neutron induced inelastic cross-sections of 150Sm for En=1–35MeV

Deformation dependent TUL multi-step direct model

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