Averaged nonstatistical effects in the 3 s region for capture reactions

Journal Article · Fri Dec 01 04:00:00 EST 1989 · Physical Review (Section) C: Nuclear Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevC.40.2541· OSTI ID:7265370

Ho, Y ^[1]; Liu, J ^[2]; Yuan, Z ^[3]

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1. Center of Theoretical Physics, China Center of Advanced Science epartment, Fudan University, Shanghai, China (China)
2. Physics Department, Zhengzhou University, Zhengzhou, Henan, (China)
3. Nuclear Science Department, Fudan University, Shanghai, (China)

An expression for photon transmission coefficients in the resonance regions was given, which consists of three parts corresponding to the statistical model, radiative capture in the compound elastic scattering channel, and radiative capture in the inelastic scattering channel, respectively. The last two mechanisms as well as the direct-semidirect capture are classified in the nonstatistical category. The radiative neutron capture for 13 even-neutron nuclides in the 3{ital s} mass region were investigated in the resonance energy range less than 3 MeV. The present studies show that it is possible to reproduce the measured capture cross sections and gamma-ray spectra reasonably, provided both the statistical and nonstatistical contributions are taken into account. Among the four mentioned nonstatistical mechanisms, the contribution from the radiative capture in the compound elastic scattering channel is dominant, which shows the positive correlations with the neutron strength function and the ({ital d},{ital p}) spectroscopic factors in the final states; the maximum nonstatistical fraction is about 30%. No prominent even-odd effect of the proton number was observed.

• OSTI ID: 7265370
• Journal Information: Physical Review (Section) C: Nuclear Physics; (USA), Journal Name: Physical Review (Section) C: Nuclear Physics; (USA) Vol. 40:6; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
CAPTURE
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DEUTERON REACTIONS
ELASTIC SCATTERING
ENERGY RANGE
GAMMA SPECTRA
HADRON REACTIONS
INELASTIC SCATTERING
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 01-10
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
QUASI PARTICLES
RESONANCE SCATTERING
SCATTERING
SPECTRA
STATISTICAL MODELS
TOTAL CROSS SECTIONS