In this work,differential cross sections ofγ-ray emission produced in nuclear reactions induced by 14.1 MeV neutrons are measured for the 4.439 MeV line from carbon,as well as for 10 individualγ-ray lines from alumi...In this work,differential cross sections ofγ-ray emission produced in nuclear reactions induced by 14.1 MeV neutrons are measured for the 4.439 MeV line from carbon,as well as for 10 individualγ-ray lines from aluminum,6 from silicon,8 from calcium,16 from titanium,6 from chromium,and 14 from iron.The measurements were conducted using the tagged neutron method with four LaBr_(3)(Ce)scintillation detectors positioned at angles of 25°,45°,60°,and 70°relative to the generator target–sample center axis.A neutron generator that can produce 16 separate beams of tagged neutrons was employed,which combined with the detector system,enabled the determination of differential cross-sections for 64 distinct angle values in the range of 17°to 89°.To simplify data visualization,the angular distributions were divided into 5°intervals,with weighted mean values of the angle and differential cross-section calculated for each interval.Corrections for multiple neutron scattering and attenuation,γ-ray attenuation,and total detection efficiency computed using GEANT4 were accounted for in the cross-section calculations.Additional measurements were performed to validate the correction calculations.The totalγ-ray emission cross-sections were obtained by approximating the angular distributions with even-order Legendre polynomial expansions up to the 6th degree,followed by integration over the full solid angle.The total systematic error for the obtained data was estimated as 9.1%.展开更多
A study of the inelastic scattering of neutrons with an energy of 14.1 MeV on the nuclei of oxygen,phosphorus,and sulfur was performed at the TANGRA facility at JINR(Dubna).The experiment aimed to refine existing data...A study of the inelastic scattering of neutrons with an energy of 14.1 MeV on the nuclei of oxygen,phosphorus,and sulfur was performed at the TANGRA facility at JINR(Dubna).The experiment aimed to refine existing data and obtain new data on the yields and angular distributions ofγ-quanta emitted by the studied nuclei due to neutron-induced nuclear reactions using the tagged neutron method.Two types of detector systems were used to registerγ-quanta.Theγ-ray yields were measured using a high-purity germanium(HPGe)detector.The angular distributions ofγ-rays were obtained using a system of 18 scintillation detectors based on bismuth germanite Bi_(4)Ge_(3)O_(12)(BGO)located around the sample.The performed experiments measured the yields of two transitions for the reaction of tagged neutrons with 16O,nine transitions for the reaction with ^(31)P,and nine transitions for the reaction with ^(32)S for the first time.The angular anisotropy of theγ-radiation accompanying the inelastic scattering of neutrons with an energy of 14.1 MeV on ^(31)P nuclei was also measured for the first time.展开更多
文摘In this work,differential cross sections ofγ-ray emission produced in nuclear reactions induced by 14.1 MeV neutrons are measured for the 4.439 MeV line from carbon,as well as for 10 individualγ-ray lines from aluminum,6 from silicon,8 from calcium,16 from titanium,6 from chromium,and 14 from iron.The measurements were conducted using the tagged neutron method with four LaBr_(3)(Ce)scintillation detectors positioned at angles of 25°,45°,60°,and 70°relative to the generator target–sample center axis.A neutron generator that can produce 16 separate beams of tagged neutrons was employed,which combined with the detector system,enabled the determination of differential cross-sections for 64 distinct angle values in the range of 17°to 89°.To simplify data visualization,the angular distributions were divided into 5°intervals,with weighted mean values of the angle and differential cross-section calculated for each interval.Corrections for multiple neutron scattering and attenuation,γ-ray attenuation,and total detection efficiency computed using GEANT4 were accounted for in the cross-section calculations.Additional measurements were performed to validate the correction calculations.The totalγ-ray emission cross-sections were obtained by approximating the angular distributions with even-order Legendre polynomial expansions up to the 6th degree,followed by integration over the full solid angle.The total systematic error for the obtained data was estimated as 9.1%.
文摘A study of the inelastic scattering of neutrons with an energy of 14.1 MeV on the nuclei of oxygen,phosphorus,and sulfur was performed at the TANGRA facility at JINR(Dubna).The experiment aimed to refine existing data and obtain new data on the yields and angular distributions ofγ-quanta emitted by the studied nuclei due to neutron-induced nuclear reactions using the tagged neutron method.Two types of detector systems were used to registerγ-quanta.Theγ-ray yields were measured using a high-purity germanium(HPGe)detector.The angular distributions ofγ-rays were obtained using a system of 18 scintillation detectors based on bismuth germanite Bi_(4)Ge_(3)O_(12)(BGO)located around the sample.The performed experiments measured the yields of two transitions for the reaction of tagged neutrons with 16O,nine transitions for the reaction with ^(31)P,and nine transitions for the reaction with ^(32)S for the first time.The angular anisotropy of theγ-radiation accompanying the inelastic scattering of neutrons with an energy of 14.1 MeV on ^(31)P nuclei was also measured for the first time.
