NEUTRON-CAPTURE γ-RAY STUDIES IN 50Cr(n, γ)51Cr

1966 ◽  
Vol 44 (9) ◽  
pp. 2111-2130 ◽  
Author(s):  
G. A. Bartholomew ◽  
E. D. Earle ◽  
M. R. Gunye
Keyword(s):  
Angular Correlation ◽  
Neutron Capture ◽  
Decay Scheme ◽  
Γ Ray ◽  
Correlation Techniques

Level energies and details of the γ-ray decay scheme in 51Cr are determined by Ge(Li) spectrometer and angular correlation techniques. Spin 3/2 is assigned to levels at 0.748, 1.898, 2.893, 3.125, and 3.769 MeV. A level at 776 keV, for which spin 1/2– is favored, may account for the anomalous lifetime previously reported for the 748-keV γ ray in 51Cr.

THE 199Hg(n, γ)200Hg REACTION WITH THERMAL NEUTRONS

1967 ◽  
Vol 45 (4) ◽  
pp. 1517-1540 ◽  
Author(s):  
G. A. Bartholomew ◽  
S. I. H. Naqvi ◽  
M. R. Gunye ◽  
E. D. Earle
Keyword(s):  
Thermal Neutron ◽  
Angular Correlation ◽  
Level Scheme ◽  
Neutron Capture ◽  
Gamma Ray ◽  
Germanium Detector ◽  
Thermal Neutrons ◽  
Thermal Neutron Capture ◽  
Γ Rays ◽  
Correlation Techniques

Thermal neutron-capture γ rays from 199Hg(n, γ)200Hg were studied with a lithium germanium detector and with angular correlation techniques. Gamma-ray and level energies were determined with accuracies of at best ±3 keV. Spin 0 for the capturing state was confirmed and levels at 1 569, 2 060, 2 369, 2 640, 3 186, 3 269, 3 289, 3 351 keV were assigned spin 1. The 200Hg level scheme is discussed.

γ–γ ANGULAR CORRELATION MEASUREMENTS OF THERMAL-NEUTRON-CAPTURE γ RAYS IN 53Cr AND 54Cr

1965 ◽  
Vol 43 (6) ◽  
pp. 1128-1156 ◽  
Author(s):  
G. A. Bartholomew ◽  
M. R. Gunye
Keyword(s):  
Thermal Neutron ◽  
Angular Correlation ◽  
Neutron Capture ◽  
Branching Ratios ◽  
Thermal Neutron Capture ◽  
Γ Rays ◽  
Γ Ray ◽  
Made In

Coincidence and angular correlation measurements have been made on γ rays following thermal-neutron capture in separated targets of 52Cr and 53Cr. The following spin assignments are made in 53Cr: 0.563-, 2.32-, 2.71-, and 3.62-MeV levels, 1/2, 3/2, 1/2, and (3/2) respectively, and in 54Cr: 2.63-, 2.84-, 3.08-, 3.73-, 4.91-, and 5.30-MeV levels, 2,(0)2, 2, 1 or 2, 1 or 2, and 1, 2, or 3 respectively. Details of the decay schemes, branching ratios, and γ-ray multipole mixtures are given also.

Decay Schemes for the Isomers of 148Pm and the Cross Sections for their Production by Neutron Capture in 147Pm

1971 ◽  
Vol 49 (1) ◽  
pp. 108-117 ◽  
Author(s):  
R. S. Mowatt ◽  
W. H. Walker
Keyword(s):  
Neutron Flux ◽  
Cross Sections ◽  
Neutron Capture ◽  
Decay Scheme ◽  
Production Cross ◽  
Thermal Reactor ◽  
Small Correction ◽  
Γ Ray ◽  
Neutron Cross Sections ◽  
Good Agreement

The γ-ray spectra arising from the decay of 41-day 148Pmm and 5-day 148Pmg produced by the irradiation of 2.6-year 147Pm in a thermal reactor neutron flux have been measured with a Ge(Li) detector. The absolute probabilities for γ-ray emission were determined from an analysis of the spectra and used to construct an improved decay scheme for the two isomers and to obtain their production cross sections. The 147Pm thermal neutron cross sections obtained after making a small correction for epithermal capture are 84 ± 10 b and 72.4 ± 3.0 b for the production of the 148Pmg and 148Pmm activities respectively, in good agreement with the results of Fenner and Large, but significantly smaller than other recent measurements.

Excited Levels in 231Th from Neutron Capture γ-Ray Measurements

1979 ◽  
pp. 802-804
Author(s):  
D. H. White ◽  
G. Barreau ◽  
H. G. Börner ◽  
W. F. Davidson ◽  
R. W. Hoff ◽  
...  
Keyword(s):  
Neutron Capture ◽  
Γ Ray

PROPERTIES OF THE 7.02-MeV AND 10.65-MeV LEVELS OF 20Ne

1967 ◽  
Vol 45 (6) ◽  
pp. 2133-2143 ◽  
Author(s):  
P. J. M. Smulders ◽  
C. Broude ◽  
A. E. Litherland
Keyword(s):  
Angular Correlation ◽  
Excellent Agreement ◽  
Amplitude Ratio ◽  
Branching Ratio ◽  
Rotational Model ◽  
Particle Counter ◽  
Correlation Techniques

The 7.02-MeV level of 20Ne has been studied by the I2C(12C, αγ)20Ne reaction, using angular correlation techniques, with a particle counter and six Nal crystals. The spin and parity of this level were determined to be 4−. The branching ratio of the decays to the 5.63, 4.97, and 4.25 MeV levels was found to be 22:65:13. The transition to the 5.63-MeV state (4− → 3−) is an almost pure E2 transition with an M1/E2 amplitude ratio of 0.03 ± 0.03. The branching ratio of the E2 transitions to the 5.63-MeV 3− level and the 4.97-MeV 2− level is in excellent agreement with predictions from the rotational model and also with SU3 calculations.Similar measurements on the 10.65-MeV level in 20Ne support the tentative 6− assignment to this level.

Spins of Levels in 32P by Angular-Correlation Studies

1971 ◽  
Vol 49 (23) ◽  
pp. 2931-2937 ◽  
Author(s):  
C. St-Pierre ◽  
R. Gagnon ◽  
G. S. Gill
Keyword(s):  
Angular Correlation ◽  
Decay Scheme ◽  
Correlation Method ◽  
Spectroscopic Properties ◽  
Angular Correlations ◽  
Correlation Studies ◽  
Other Information

The spectroscopic properties of the 1.75, 2.66, 2.74, and 3.00 MeV levels of 32P have been studied by the particle–gamma angular-correlation method II of Litherland and Ferguson applied to the reaction 29Si(α,p)32P at 10.3 MeV. The decay scheme was observed with a Ge–Li detector in coincidence with the protons. The spin of the 1.75 MeV level was determined to be 3. The restrictions imposed on J by the analysis of the angular correlations combined with other information lead to the following most probable assignments: 2.66 MeV, J = 1,2; 2.74 MeV, J = 1,2; 3.00 MeV, J = 1,2,3.

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