M. V. Sedysheva

Differential cross-section measurement for the {sup 6}Li(n,t){sup 4}He reaction at 3.67 and 4.42 MeV

Abstract A gridded ionization chamber was used to measure the differential cross sections for tritons from the 6Li(n,t)4He reaction at 3.67 and 4.42 MeV. Neutrons were produced via the D(d,n)3He reaction. The absolute neutron flux was determined through the 238U(n,f) and H(n,p) reactions. At 3.67 MeV the result is almost 90 deg symmetric, but it is obviously forward peaked at 4.42 MeV in the center-of-mass reference system.

Differential cross-section measurement for the 64Zn(n,α)61Ni reaction at 5.03 and 5.95 MeV

Abstract Differential cross sections of the 64Zn(n,α)61Ni reaction were measured at neutron energies of 5.03 and 5.95 MeV by using a gridded ionization chamber. The experiment was performed at the 4.5-MV Van de Graaff accelerator of the Institute of Heavy Ion Physics, Peking University. Neutrons were produced through the D(d,n)3He reaction with a deuterium gas target. The absolute neutron flux was determined by the 238U(n,f) reaction and a calibrated BF3 long counter. Present results are compared with existing data.

Differential cross-section measurement for the 10B(n, α)7Li reaction

Abstract The differential cross sections of the 10B(n, α)7Li reaction were measured at 4.17, 5.02, 5.74, and 6.52 MeV by using a gridded ionization chamber. Neutrons were produced through the D(d,n)3He reaction. The absolute neutron flux was determined through the 238U(n,f) reaction. The experiment shows that as the neutron energy increases from 4.17 to 6.52 MeV, the differential cross section changes from almost 90-deg symmetry to obviously backward peaked in the center-of-mass reference system.

Statistical Model Approach to (n,p) Reaction Cross Section Systematics

In the framework of the statistical model approach to nuclear reactions, using the evaporation model and constant nuclear temperature approximation a formula for the neutron induced charged particle emission reaction cross sections is deduced. In the case of fast neutrons a simple formula for systematic analysis of the (n, p) cross sections is obtained.

Measurement of Differential Cross Section for the 64Zn(n,a)61 Ni Reaction at 2.54, 4.00, and 5.50 MeV

Abstract By using a twin-gridded ionization chamber, differential cross-section data of the 64Zn(n,α)61Ni reaction were measured at neutron energies of 2.54, 4.00, and 5.50 MeV. The experiment was performed at the 4.5-MV Van de Graaff accelerator of the Institute of Heavy Ion Physics, Peking University, China. Monoenergetic neutrons of 2.54 MeV were produced through the T(p,n)3He reaction with a solid Ti-T target, and those of 4.00 and 5.50 MeV were produced through the D(d,n)3He reaction with a deuterium gas target. The absolute neutron flux was determined through the 238U(n,f) reaction and a BF3 long counter was used as the neutron flux monitor. Results of the present work are combined with our previous data between 5.0 and 6.5 MeV and compared with other measurements and evaluations.

Angular distribution and cross-section measurements for 64Zn(n, α)61Ni reaction at 5.0, 5.7, and 6.5 MeV

Abstract Using a gridded ionization chamber, angular distributions for the 64Zn(n, α)61Ni reaction were measured at 5.0, 5.7, and 6.5 MeV. The neutrons were produced through the D(d,n)3He reaction. The neutron flux was determined through the 238U(n, f) reaction. The results show a backward peak in the center-of-mass reference system for 5.7 and 6.5 MeV. The cross sections are 72.5, 72.0, and 70.8 mb for 5.0, 5.7, and 6.5 MeV, respectively.

Cross sections of theZn67(n,α)64Ni reaction at 4.0, 5.0, and 6.0 MeV

Experimental cross section data of the {sup 67}Zn(n,{alpha}){sup 64}Ni reaction are very scanty because the residual nucleus {sup 64}Ni is stable and the commonly used activation method is not feasible. As a result, very large deviations (about 10 times) exist among different nuclear data libraries. In the present work, cross sections of the partial {sup 67}Zn(n,{alpha}{sub 0}){sup 64}Ni and total {sup 67}Zn(n,{alpha}){sup 64}Ni reactions are measured at neutron energies of 4.0 and 5.0 MeV for the first time, and those of 6.0 MeV are remeasured for consistency checking. A twin-gridded ionization chamber was used as the charged-particle detector and two enriched back-to-back-set {sup 67}Zn samples were adopted. Experiments were performed at the 4.5 MV Van de Graaff Accelerator of Peking University. Neutrons were produced through the {sup 2}H(d,n){sup 3}He reaction using a deuterium gas target. Absolute neutron flux was determined by counting the fission fragments from a {sup 238}U sample placed inside the gridded ionization chamber while a BF{sub 3} long counter was employed as neutron flux monitor. Present data are compared with results of previous measurements, evaluations, and talys code calculations.

Measurement of cross sections for the 147Sm(n, α)144Nd reaction at 5.0 and 6.0 MeV

Cross sections of the (147)Sm(n, alpha)(144)Nd reaction were measured at En=5.0 and 6.0MeV. A twin gridded ionization chamber was used as a charged particle detector and two large area (147)Sm(2)O(3) samples placed back to back were employed. Experiments were performed at the 4.5MV Van de Graaff accelerator of Peking University. Neutrons were produced through the D(d, n)(3)He reaction with a deuterium gas target. Absolute neutron flux was determined by a small (238)U fission chamber. Present cross-section data are compared with existing results of evaluations and measurements.

Differential and angle-integrated cross-section measurement for the 6Li(n, t)4He reaction at En = 1.05, 1.54, and 2.25 MeV

Abstract Differential cross sections and angle-integrated cross sections of the 6Li(n,t)4He reaction were measured at En = 1.05, 1.54, and 2.25 MeV by using the gridded ionization chamber method. A 6LiF sample and a 238U sample were set back-to-back inside the twin chamber for measurement. Neutrons were produced through the T(p,n)3He reaction. The absolute neutron flux for En = 2.25 MeV was determined by the 238U(n,f) reaction, and those for En = 1.54 MeV and En = 1.05 MeV were determined by a calibrated BF3 long counter. Present results are compared with existing data.

Measurement of differential cross sections of the 6Li(n, t)4He reaction at 1.85 and 2.67 MeV

Abstract The differential cross sections of the 6Li(n,t)4He reaction were measured at 1.85 and 2.67 MeV by using a gridded ionization chamber. Neutrons were produced through the T(p,n)3He reaction. The absolute neutron flux was determined through the 238U(n,f) reaction. Results are compared with existing data.