scholarly journals The determination of the composition of slurries by the measurement of thermal-neutron-capture gamma radiation

1972 ◽  
Author(s):  
H P Dibbs ◽  
J L Dalton ◽  
S S Nargolwalla
Keyword(s):  
Gamma Radiation ◽  
Thermal Neutron ◽  
Neutron Capture ◽  
Thermal Neutron Capture

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 51V(n, γ)52V REACTION

1967 ◽  
Vol 45 (8) ◽  
pp. 2683-2694 ◽  
Author(s):  
N. P. Archer ◽  
T. J. Kennett
Keyword(s):  
Gamma Radiation ◽  
Thermal Neutron ◽  
Ground State ◽  
Neutron Capture ◽  
Decay Scheme ◽  
Thermal Neutron Capture ◽  
Separation Energy ◽  
Direct Capture ◽  
Coincidence Measurements

The gamma radiation following thermal neutron capture by vanadium has been studied using a Ge(Li) detector. A separation energy of 7 311 ± 2 keV was determined and the ground-state triplet was observed, confirming levels of 17 and 23 keV. Coincidence measurements were used to assist in the construction of a decay scheme which includes 97% of the total observed intensity. The agreement with (d, p) measurements is very good and permits one to conclude that essentially all of the observed transitions are E1. The lack of any correlation between reduced radiation widths and stripping strengths suggests the absence of direct capture.

A study of the 23Na(n,γ)24Na and 27Al(n,γ)28Al reactions

1969 ◽  
Vol 47 (9) ◽  
pp. 953-961 ◽  
Author(s):  
L. W. Nichol ◽  
A. H. Colenbrander ◽  
T. J. Kennett
Keyword(s):  
Gamma Radiation ◽  
Thermal Neutron ◽  
Gamma Rays ◽  
Neutron Capture ◽  
Decay Scheme ◽  
Thermal Neutron Capture

A study of the gamma radiation following thermal-neutron capture by natural sodium and aluminum has been conducted using a Ge(Li) spectrometer. For sodium, 68 gamma rays were observed and their intensities and energies determined; for aluminum, 85 gamma rays were identified. A decay scheme for aluminum has been proposed from the present measurements. The neutron separation energies were found to be 6960.3 ± 1.5 keV for sodium and 7725.5 ± 1.5 keV for aluminum. The lifetime of the 472-keV level in sodium was measured to be 20.5 ± 0.5 ms using a chopped beam of neutrons.

A STUDY OF THE GAMMA RADIATION FOLLOWING THERMAL NEUTRON CAPTURE BY SILICON

1967 ◽  
Vol 45 (5) ◽  
pp. 1871-1884 ◽  
Author(s):  
H. Lycklama ◽  
L. B. Hughes ◽  
T. J. Kennett
Keyword(s):  
Gamma Radiation ◽  
Thermal Neutron ◽  
Single Particle ◽  
Neutron Capture ◽  
Decay Scheme ◽  
Time Correlation ◽  
Neutron Separation Energy ◽  
Thermal Neutron Capture ◽  
Separation Energy

A study of the gamma radiation following thermal neutron capture by natural silicon has been conducted. Precise energy measurements were obtained using a Ge(Li) counter and a decay scheme was constructed using the time correlation results obtained with a Ge(Li)–NaI(Tl) spectrometer. The neutron separation energy was found to be 8 474 ± 1 keV for 29Si. An examination of the reduced radiation widths revealed that, while E1 and E2 radiation agreed well with the single-particle estimate, the M1 strength was hindered by a factor of from 10 to 100.

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