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NUCLEAR PHYSICS LABORATORY PROGRESS REPORT FOR THE PERIOD NOVEMBER 1, 1959 TO OCTOBER 31, 1960

Published
United States : [publisher not identified], 1961.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1961.
Physical Description
microopaque : positive ; 8 x 13 cm

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Summary
Experimental Research - Betatron Group. Experiments to clarify the photoproton processes in Li/sup 6/ by direct observation of the proton energy spectrum versus betatron energy are described. Data taken between 18 and 20.5 Mev show a peak for a 5-Mev proton. As betatron energy increases, the pead strength increases. No such anomaly is observed with Li/sup 7/. A Cherenkov beam monitor for the betatron is described which consists of a lucite strip coupled to a photomultiplier. A 100-kv pulsed vacuum spark x-ray source was completed. Experimental Research - Van de Graaff Group. Operation and instrumentation of the Van de Granuf accelerator are summarized. Nuclear resonant absorption was used to determine the total width, the radiation width, and the proton width for a previously unreported level at 10.3 Mev in Ca/sup 40/. A pulsed-beam time-of-flight experiment was performed in good geometry to measure the total cross sections for U/sup 235/ and U/sup 238/ at 0.5- to 1.0-Me v neutron energy. The results are about 1% higher than previously published. The differentiai elastic neutron scattering cross sections were determined for F/sup 19/ at 565 and 1000 kev, using a time-of-flight technique. Inelastic scattering angular distributions were obtained for 565-kev neutrons. The differential scattering cross sections for 0.71- and 0.90-Mev neutrons elastically scattered from C/sup 12/ were measured by time-of-flight, and the differential elastic and inelastic scattering cross sections for excitation of the 0.133- and 0.303-Mev levels in Ta/sup 181/ were measured for 0.71- and 0.90-Mev neutrons. Development of instrumentation for (n,n'y) angular correlation measurement is described. A neutron polarization analyzer using He/sup 4/ was designed and built. Progress in the pulsing modification of Van de Graaff is reported. Theoretical Research Program. Work on Li/sup 6/ structure was extended by variational calculations based on a wave function for Li/sup 6/ consisting of an antisymmetrized product of a wave function for the 4-core nucleons and a wave function for the two extra- core nucleons. The problem of writing a given antisymmetric function in n variables as a Slater determinant of n one-variable functions wss solved, using methods based on the theory of mappings of linear vector spaces. It is suggested how shaping the r-f voltage in synchronous accelerators can expand the range of phase stability. It was found that vacuum polarization has no effect on the rate of astrophysica1 p + p - H/sup 2/ reactions. (T.R.H.)
Report Numbers
TID-11005
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
DOE contract number: AT(11-1)-720
NSA number: NSA-15-009549
OSTI Identifier 4088859
Research organization: Case Inst. of Tech., Cleveland. Nuclear Physics Lab.
View MARC record | catkey: 42247940