scholarly journals keV Neutron Resonance Capture in Barium-137

1976 ◽  
Vol 29 (3) ◽  
pp. 157 ◽  
Author(s):  
AR de L Musgrove ◽  
BJ Allen ◽  
JW Boldeman ◽  
RL Macklin
Keyword(s):  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Strength Function ◽  
P Wave ◽  
Neutron Resonance ◽  
Resonance Capture ◽  
Level Spacing ◽  
S Wave ◽  
Radiative Width

The neutron capture cross section of 137Ba has been measured to high resolution (AE/E ~ o� 2 %) below En = 60 keY. Average values of resonance parameters, extracted for resonances in the range 2�7 < En < 12 keY, are as follows: s-wave level spacing <D) = 380� 70 eV; s-wave radiative width <Tv). = 80�15meV; s-wave neutron strength function 104 So = 0'57�0'2; and p-wave neutron strength function 104 S1 = 0�45�0�2. The s-wave radiative width and the s-wave neutron strength function appear to be lower for 137Ba than for the other barium isotopes.

scholarly journals keV Neutron Capture in 141Pr

1979 ◽  
Vol 32 (6) ◽  
pp. 551 ◽  
Author(s):  
RB Taylor ◽  
BJ Allen ◽  
AR de L Musgrove ◽  
RL Macklin
Keyword(s):  
Standard Deviation ◽  
Statistical Model ◽  
Cross Section ◽  
Energy Resolution ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
S Wave ◽  
Radiative Width

The neutron capture cross section of 141Pr has been measured with 0�2% energy resolution from 2�5 to 200 keY. Resonance parameters are given from 2�6 to 13�3 keY. The average s-wave radiative width is 88 meY, with a standard deviation of 27 meY. The s-wave reduced neutron widths and the corresponding radiative widths are not correlated, but the standard deviation of the s-wave radiative widths greatly exceeds that predicted by the statistical model.

scholarly journals Resonant Neutron Capture in 45Sc Below 100 keV

1977 ◽  
Vol 30 (6) ◽  
pp. 605 ◽  
Author(s):  
MJ Kenny ◽  
BJ Allen ◽  
RL Macklin
Keyword(s):  
Cross Section ◽  
Energy Resolution ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
P Wave ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
S Wave ◽  
Standard Deviations

The neutron capture cross section of 45SC has been measured with 0�2 % energy resolution in the range 2�S-100keV. Many new I> 0 resonances are observed and the average s- and p-wave radiative widths and standard deviations are <Γγ>s = 0�84�0�46eV and <Γγ>p = 0�S�0�3eV. No significant correlation is observed between the reduced neutron widths and radiative widths of the s-wave resonances.

scholarly journals Resonant Neutron Capture in 139La

1977 ◽  
Vol 30 (6) ◽  
pp. 599 ◽  
Author(s):  
AR de L Musgrove ◽  
BJ Allen ◽  
RL Macklin
Keyword(s):  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Strength Function ◽  
High Energy ◽  
P Wave ◽  
High Energy Resolution ◽  
Capture Cross ◽  
Electron Linear Accelerator ◽  
Oak Ridge

The neutron capture cross section of 139La has been measured with high energy resolution between 2� 5 and 90 ke V using the capture cross section facility at the 40 m station on the Oak Ridge Electron Linear Accelerator. Individual resonances were analysed to 15 keV and the average s- and p-wave radiative widths deduced were <Γγ>s = 55�6meV and <Γγ>p = 4O�7meV. The p-wave neutron strength function obtained was S1 = (0'30�0'1O)x 10-4 ? The s-wave resonances decay strongly to final f-wave states via a postulated doorway state mechanism. The transition strengths for these decays are not correlated with the neutron widths of the initial states.

THE PURIFICATION, DETERMINATION, AND NEUTRON CAPTURE CROSS SECTION OF ACTINIUM-227

1959 ◽  
Vol 37 (6) ◽  
pp. 1094-1103 ◽  
Author(s):  
M. J. Cabell
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Exchange Chromatography ◽  
Thermal Neutron Capture ◽  
Resonance Capture ◽  
Capture Cross ◽  
Neutron Capture Cross Section

Procedures are described for (a) the separation by ion exchange chromatography of submicrogram quantities of Ac227 from its daughters and (b) the absolute determination of Ac227 by measurement of the rate of growth of α-particle emission from an initially pure source. These procedures are utilized in the determination of the reactor and thermal neutron capture cross sections and the resonance capture integral of Ac227 by an activation method.Assuming 36.5 barns for the thermal neutron capture cross section of Co59, a value of σ2200 = 814 ± 13 barns has been obtained for Ac227. The resonance capture integral (from 0.5 ev to ∞) was found to be 1177 ± 19 barns relative to 48.6 barns for the resonance capture integral of Co59.

The thermal neutron capture cross-section and the resonance capture integral of 124Xe

1964 ◽  
Vol 26 (1) ◽  
pp. 9-14 ◽  
Author(s):  
M. Bresesti ◽  
F. Cappellani ◽  
A.M. Del Turco ◽  
E. Orvini
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Thermal Neutron Capture ◽  
Resonance Capture ◽  
Capture Cross ◽  
Neutron Capture Cross Section

EFFECTIVE AND THERMAL NEUTRON CAPTURE CROSS SECTION AND RESONANCE CAPTURE INTEGRAL OF Pr-143

1959 ◽  
Vol 37 (8) ◽  
pp. 907-915 ◽  
Author(s):  
J. C. Roy ◽  
L. P. Roy
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Thermal Neutron Capture ◽  
Resonance Capture ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
Cross Section Formula ◽  
Effective Neutron

The effective neutron capture cross section,[Formula: see text]; the 2200 meters/sec neutron capture cross section, σ0, and the resonance capture integral, RI, of Pr-143 have been measured by an activation method. The values are: [Formula: see text], σ0 = 89 ± 10, and RI = 190 ± 25 barns respectively. The neutron fluxes have been measured with cobalt monitors. All these values have been calculated according to the Westcott convention, which has been outlined insofar as it can be applied to activation work.

THE THERMAL NEUTRON CAPTURE CROSS SECTION AND THE RESONANCE ABSORPTION INTEGRAL OF Th230 (IONIUM)

1958 ◽  
Vol 36 (8) ◽  
pp. 989-996 ◽  
Author(s):  
M. J. Cabell
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Neutron Capture ◽  
Half Life ◽  
Capture Cross Section ◽  
Resonance Absorption ◽  
Thermal Neutron Capture ◽  
Resonance Capture ◽  
Capture Cross ◽  
Neutron Capture Cross Section

The thermal neutron capture cross section and the resonance capture integral of Th230 have been determined by an activation method. Assumptions are made that the thermal capture cross section and the resonance capture integral of Co59 are 36.5 barns and 48.6 barns respectively, that the half-life of Th230 is 8.00 × 104 years, and that Th230 behaves as a 1/v absorber in the subcadmium region. Based on these assumptions values of σ2200 = 21.4 ± 0.3 barns and of 937 ± 32 barns for the resonance absorption integral (from 0.5 ev to ∞) have been obtained for Th230.The half-life of Th231 has been determined as 25.52 ± 0.01 hours.

The thermal neutron capture cross-section and resonance capture integral of 125I

1964 ◽  
Vol 26 (10) ◽  
pp. 1625-1631 ◽  
Author(s):  
M. Bresesti ◽  
A.M.Bresesti Del Turco ◽  
H. Neumann ◽  
E. Orvini
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Thermal Neutron Capture ◽  
Resonance Capture ◽  
Capture Cross ◽  
Neutron Capture Cross Section
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