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Neutron energies and angular distributions were measured in 9Be(α ,n)12C reaction for α energies of 5.5 and 6.5 MeV. Three major neutron groups were observed in the spectrum, which correspond to the ground and first two excited states of 12C. Measured data could only be explained by the TALYS calculation if reaction at more than one location within the target is considered for a given beam energy. The preferred locations are driven by the resonance energy levels existing in 13C. Neutron yield due to the 9Be breakup process was determined which is found to be 12.6 ± 0.2% and 18.4 ± 0.5% of the total reaction cross-section for 5.5 and 6.5 MeV respectively. [ABSTRACT FROM AUTHOR]

Neutron evaporation energy spectra have been measured in coincidence with &ggr; rays of different multiplicities for 119Sb* in the excitation energy range of ∼31-43 MeV. The inverse level density parameter (k) have been extracted for different angular momentum regions corresponding to different &ggr;-ray multiplicities by comparing the experimental neutron energy spectra with statistical model prediction. It has been observed that the level density increases with the increase in angular momentum. Possible reasons for this variation have been discussed. [ABSTRACT FROM AUTHOR]

Abstract: Response functions of monoenergetic neutrons at various energies, corresponding to a measured neutron energy spectrum have been extracted. The experimental response functions for neutron energies in the range of have been compared with the respective GEANT4 predictions. It has been found that, there is some discrepancy between the experimental and the GEANT4 simulated neutron response functions at lower pulse height regions, which increases with the increase of neutron energy. This might be due to the incompleteness of the physics processes used in the present GEANT4 simulations. In particular, higher order reaction processes which become more significant at higher energies should be properly taken into account in the calculation of response function. [Copyright &y& Elsevier]