Measurements of double differential neutron emission cross sections for fusion reactor candidate elements.

Takahashi, Akito; Yamamoto, Junji; Oshima, Koichiro; Ueda, Masahiro; FUKAZAWA, Masanori; Yanagi, Y.; Miyaguchi, Jinichi; Sumita, Kenji

doi:10.3327/jnst.21.577

Cited by 11 publications

(7 citation statements)

References 3 publications

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“…We show in figure 1 the double differential cross section corresponding to inelastic scattering of 14.5 MeV on 208 Pb and an outgoing neutron energy of 8.5 MeV. Our result is in fair agreement with the expereimental data [13], even if there seems to be a discrepancy at intermediate angles. This feature may come from the contribution of some collective states whose contributions are averaged in our cross section calculation.…”

Section: Results For Inelastic Neutron Scattering On 208 Pbsupporting

confidence: 81%

Quantum preequilibrium multistep direct calculations for nucleon scattering on spherical and deformed nuclei: a microscopic approach

Dupuis

Bonneau

Kawano

et al. 2007

Nd2007

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Abstract. Preequilibrium multistep direct (MSD) double differential cross sections are calculated for medium energy inelastic neutron scattering (11-18 MeV) on 208 Pb and 238 U. A microscopic approach is used, since no adjustable parameters are involved. Cross section are expressed as a sum of DWBA transition amplitudes computed with the microscopic two-body interaction M3Y. Final target states are expressed as particle-hole excitations built from single particle states obtained within the HF+BCS theory applied with Skyrme force.

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Section: Results For Inelastic Neutron Scattering On 208 Pbsupporting

confidence: 81%

Quantum preequilibrium multistep direct calculations for nucleon scattering on spherical and deformed nuclei: a microscopic approach

Dupuis

Bonneau

Kawano

et al. 2007

Nd2007

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“…The present data shown in Fig. 17 have statistics and energy resolution comparable to the previous ones by the ring geometry< 13 >. Since the incident energy is nearly fixed to En = 14.1 MeV, clearer discussion can be made for the angular dependence of emission spectrum.…”

Section: Flourinesupporting

confidence: 73%

“…To change the scattering angle, the sample is moved along the circular curve of the insert, although for very forward or backward angle the sample position deviates in a straight way from broken curves. Since the total volume of the sample is about 1/10 of the ring sample< 13 …”

Section: Tof Facilitymentioning

confidence: 99%

“…Concerning the energy resolution, we can adopt a little bit shorter flight path than that (9.5 m) of the ring geometry arrangement< 13 ) since the energy spread of incident source neutrons is minimum in the 90° direction to the o+ beam line. In the present arrangement, an NE213 detector of 25.4 em in diameter and 10 em long is set at about 8.3 m from the tritium target.…”

Section: >mentioning

confidence: 99%

“…3. The system is almost the same with the previous one< 13 ) except that the large NE213 detector, two parallel pulse shape discrimination circuits with different trigger timing and a constant fraction discriminator for anode out put are used. The signal processing is explained in detail in Ref.…”

Section: Neutron Detector and Measuring Systemmentioning

confidence: 99%

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Measurement of double differential neutron emission cross sections for incident neutrons of 14MeV.

Takahashi

Ichimura

Sasaki

et al. 1988

J. Nucl. Sci. Technol.

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To provide accurate double differential neutron emission cross sections of fusion reactor candidate elements at En= 14 MeV, a fixed 8.3 m TOF facility with an NE213 detector of 25.4 em diameter was installed in the 85° direction of a pulsed D-T source. Detail of scattering experiment using this facility is described. Energy resolution is± 0.21 MeV at 14 MeV and good counting statistics is attained by about I /h run using a cylindrical sample of 3 em in diameter and 7 em long.Measurements of double differential neutron emission cross sections are carried out for C, F, Mg, AI, Si, V, Cu and Pb. Results are compared with evaluated neutron emission data. Energy resolution is sufficient enough to deduce partial angular differential cross sections for elastic and discrete inelastic scatterings.

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Comments on the state densities and the transition rates in the pre-equilibrium exciton model

Akkermans

Gruppelaar

1985

Z Physik A

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It is proposed to renormalize the exciton-state densities used in models for precompound decay such that the summed state densities agree with the expressions employed in equilibrium statistical models. In this way a close fit can be guaranteed between preequilibrium model calculations and the results of equilibrium statistical models for the evaporative stage of the reaction. The consequences of this proposal for the internal transition rates of the pre-equilibrium exciton model are analyzed. The matrix element for the residual interaction is obtained not from a phenomenological parametrization, but from the nucleon mean free path in nuclear matter. It is demonstrated that the proposed renormalization, from one-component Fermi-gas formulas to two-fermion expressions for the state densities, leads to strongly improved agreement of the effective exciton-model values for the nucleon mean free path in nuclear matter with realistic estimates. It is proved that the particle-hole state densities for a two-component Fermi gas, summed over the allowed exciton-state numbers, agree with the phenomenological state-density expressions used in statistical Hauser-Feshbach models.

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Measurements of double differential neutron emission cross sections for fusion reactor candidate elements.

Cited by 11 publications

References 3 publications

Quantum preequilibrium multistep direct calculations for nucleon scattering on spherical and deformed nuclei: a microscopic approach

Quantum preequilibrium multistep direct calculations for nucleon scattering on spherical and deformed nuclei: a microscopic approach

Measurement of double differential neutron emission cross sections for incident neutrons of 14MeV.

Comments on the state densities and the transition rates in the pre-equilibrium exciton model

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