Sup 48 Ti(n, Xnpa Gamma Reaction Cross Sections Using Spallation Neutrons for E Sub N PDF Download
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[Gamma]-ray excitation functions have been measured for the interaction of fast neutrons with [sup 48]Ti (neutron energy from 1 MeV to 250 MeV). The Los Alamos National Laboratory spallation neutron source, at the LANSCE/WNR facility, provided a ''white'' neutron beam which is produced by bombarding a natural W target with a pulsed proton beam. The prompt-reaction [gamma] rays were measured with the large-scale Compton-suppressed Ge spectrometer, GEANIE. Neutron energies were determined by the time-of-flight technique. Excitation functions were converted to partial [gamma]-ray cross sections, taking into account the dead-time correction, the target thickness, the detector efficiency, and neutron flux (monitored with an in-line fission chamber). The data analysis is presented here for neutron energies between 1 to 20 MeV. Partial [gamma]-ray cross sections for transitions in [sup 47,48]Ti, [sup 48]Sc, and [sup 45]Ca have been determined. These results are compared to Hauser-Feshbach predictions calculated using the STAPRE code, which includes compound nuclear and pre-equilibrium emission. The partial cross sections for [gamma] rays, whose discrete [gamma]-ray cascade path leads to the ground state in [sup 48]Ti, [sup 47]Ti, [sup 48]Sc, and [sup 45]Ca have been summed to obtain estimates of the lower limits for reaction cross sections. Partial cross sections for unobserved [gamma]-rays are predicted from the STAPRE code. These lower limits are combined with Hauser-Feshbach calculations to deduce [sup 48]Ti(n, n')[sup 48]Ti, [sup 48]Ti(n,2n)[sup 47]Ti, [sup 48]Ti(n, p)[sup 48]Sc, and [sup 48]Ti(n, [alpha])[sup 45]Ca reaction channel cross sections.
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Languages : en
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[Gamma]-ray excitation functions have been measured for the interaction of fast neutrons with [sup 48]Ti (neutron energy from 1 MeV to 250 MeV). The Los Alamos National Laboratory spallation neutron source, at the LANSCE/WNR facility, provided a ''white'' neutron beam which is produced by bombarding a natural W target with a pulsed proton beam. The prompt-reaction [gamma] rays were measured with the large-scale Compton-suppressed Ge spectrometer, GEANIE. Neutron energies were determined by the time-of-flight technique. Excitation functions were converted to partial [gamma]-ray cross sections, taking into account the dead-time correction, the target thickness, the detector efficiency, and neutron flux (monitored with an in-line fission chamber). The data analysis is presented here for neutron energies between 1 to 20 MeV. Partial [gamma]-ray cross sections for transitions in [sup 47,48]Ti, [sup 48]Sc, and [sup 45]Ca have been determined. These results are compared to Hauser-Feshbach predictions calculated using the STAPRE code, which includes compound nuclear and pre-equilibrium emission. The partial cross sections for [gamma] rays, whose discrete [gamma]-ray cascade path leads to the ground state in [sup 48]Ti, [sup 47]Ti, [sup 48]Sc, and [sup 45]Ca have been summed to obtain estimates of the lower limits for reaction cross sections. Partial cross sections for unobserved [gamma]-rays are predicted from the STAPRE code. These lower limits are combined with Hauser-Feshbach calculations to deduce [sup 48]Ti(n, n')[sup 48]Ti, [sup 48]Ti(n,2n)[sup 47]Ti, [sup 48]Ti(n, p)[sup 48]Sc, and [sup 48]Ti(n, [alpha])[sup 45]Ca reaction channel cross sections.
Author: R. O. Nelson
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Languages : en
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{Gamma}-ray excitation functions have been measured for the interaction of fast neutrons with {sup 48}Ti (neutron energy from 1 MeV to 250 MeV). The Los Alamos National Laboratory spallation neutron source, at the LANSCE/WNR facility, provided a ''white'' neutron beam which is produced by bombarding a natural W target with a pulsed proton beam. The prompt-reaction {gamma} rays were measured with the large-scale Compton-suppressed Ge spectrometer, GEANIE. Neutron energies were determined by the time-of-flight technique. Excitation functions were converted to partial {gamma}-ray cross sections, taking into account the dead-time correction, the target thickness, the detector efficiency, and neutron flux (monitored with an in-line fission chamber). The data analysis is presented here for neutron energies between 1 to 20 MeV. Partial {gamma}-ray cross sections for transitions in {sup 47,48}Ti, {sup 48}Sc, and {sup 45}Ca have been determined. These results are compared to Hauser-Feshbach predictions calculated using the STAPRE code, which includes compound nuclear and pre-equilibrium emission. The partial cross sections for {gamma} rays, whose discrete {gamma}-ray cascade path leads to the ground state in {sup 48}Ti, {sup 47}Ti, {sup 48}Sc, and {sup 45}Ca have been summed to obtain estimates of the lower limits for reaction cross sections. Partial cross sections for unobserved {gamma}-rays are predicted from the STAPRE code. These lower limits are combined with Hauser-Feshbach calculations to deduce {sup 48}Ti(n, n'){sup 48}Ti, {sup 48}Ti(n,2n){sup 47}Ti, {sup 48}Ti(n, p){sup 48}Sc, and {sup 48}Ti(n, {alpha}){sup 45}Ca reaction channel cross sections.
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[Gamma]-ray excitation functions have been measured for the interaction of fast neutrons with 48Ti (neutron energy from 1 MeV to 250 MeV). The Los Alamos National Laboratory spallation neutron source, at the LANSCE/WNR facility, provided a ''white'' neutron beam which is produced by bombarding a natural W target with a pulsed proton beam. The prompt-reaction [gamma] rays were measured with the large-scale Compton-suppressed Ge spectrometer, GEANIE. Neutron energies were determined by the time-of-flight technique. Excitation functions were converted to partial [gamma]-ray cross sections, taking into account the dead-time correction, the target thickness, the detector efficiency, and neutron flux (monitored with an in-line fission chamber). The data analysis is presented here for neutron energies between 1 to 20 MeV. Partial [gamma]-ray cross sections for transitions in {sup 47,48}Ti, 48Sc, and 45Ca have been determined. These results are compared to Hauser-Feshbach predictions calculated using the STAPRE code, which includes compound nuclear and pre-equilibrium emission. The partial cross sections for [gamma] rays, whose discrete [gamma]-ray cascade path leads to the ground state in 48Ti, 47Ti, 48Sc, and 45Ca have been summed to obtain estimates of the lower limits for reaction cross sections. Partial cross sections for unobserved [gamma]-rays are predicted from the STAPRE code. These lower limits are combined with Hauser-Feshbach calculations to deduce 48Ti(n, n')48Ti, 48Ti(n,2n)47Ti, 48Ti(n, p)48Sc, and 48Ti(n, [alpha])45Ca reaction channel cross sections.
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Languages : en
Pages : 26
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Prompt [gamma]-ray production cross sections were measured on a 48Ti sample for incident neutron energies from 1 MeV to 200 MeV. Partial [gamma]-ray cross sections for transitions in 45−48Ti, 45−48Sc, and 43−45Ca were determined. The observation of about 130 transitions from 11 different isotopes in the present work provides a demanding test of reaction model calculations, and is the first study in this mass region to extract partial [gamma]-ray cross sections for many different reaction channels over a wide range of incident neutron energies. The neutrons were produced by the Los Alamos National Laboratory spallation neutron source located at the LANSCE/WNR facility. The prompt-reaction [gamma] rays were detected with the large-scale Compton-suppressed GErmanium Array for Neutron Induced Excitations (GEANIE). Event neutron energies were determined by the time-of-flight technique. The [gamma]-ray excitation functions were converted to partial [gamma]-ray cross sections and then compared with model calculations using the enhanced GNASH reaction code. Compound nuclear, pre-equilibrium emission and direct reaction mechanisms are included. Overall the model calculations of the partial [gamma]-ray cross sections are in good agreement with measured values.
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Languages : en
Pages : 27
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Data for 46 distinct gamma rays previously obtained at the 20-meter station of the Oak Ridge Electron Linear Accelerator (ORELA) were studied to determine cross sections for 1.0-40.0 MeV neutron interactions with 59Co. Data reduction methods and preliminary cross sections are given in this report. 5 refs., 12 figs., 8 tabs.
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Microscopic evaluated neutron cross sections for the reactions /sup 46/Ti(n;p)/sup 46/Sc, /sup 47/Ti(n;p)/sup 47/Sc and /sup 48/Ti(n;p)/sup 48/Sc are obtained from threshold (or zero energy) to 20 MeV. The results are presented in graphical and numerical (ENDF format) form. The microscopic evaluated cross sections are compared with measured fission-spectrum-averaged values.
