PROGRESS REPORT FOR JANUARY, FEBRUARY, MARCH 1958 TO THE UNITED STATES ATOMIC ENERGY COMMISSION

Technical Report · Fri Oct 31 04:00:00 EST 1958

OSTI ID:4313481

Resonance parameters for U/sup 238/ were determined for levels up to 1000 ev. GAMMA /sub n/ was determined for all of the 54 levels observed, and GAMMA /sub gg/ was determined for 32 of the strongest levels. A scintillation neutron detector using the B/sup 10/(n, alpha )Li/sup 7/ reaction and detecting the 480-kev gamma raps was constructed using four sodium iodide crystals 5 in in diameter and 1 in thick. Data are presented on the energy dependence of the U/ sup 235/ fission cross section. An N/sup 14/(n,p) scintillation counter was developed as an energy sensitive neutron detector to determine precisely the (n,p) cross section at particular energies. A proportional counter was developed to measure the angular distribution of neutrons elastically scattered by He/sup 3/ . A polarization of 20% for neutrons from the H/sup 2/(d,n)He/sup 3/ reaction was measured in the energy range from 2 to 4.5 Mev. The angular distribution of alpha particles from the N/sup 15/(d, alpha )C/sup 13/ reaction was investigated with a deuteron energy of 21 Mev. The center of mass differential cross section varies between 20 and 400 mb. The low-lying states in Ne/sup 20 were excited using the Ne/sup 20/(p,p') and the Na/sup 23/(p, alpha ) reactions, and their gamma radiations to lower-lying states observed. The low-lying states in Na/sup 23/ were excited by the Na/sup 23/(p,p') reaction. A phase shift analysis of the alpha scattering on O/sup 16/ was completed. The neutron capture cross sections of Au/sup 197/ and Ag/sup 107/ were calculated from the statistical theory of nuclear reactions. The calculations on the formation of the compound nucleus U/ sup 236/ by the U/sup 235/ + n reaction were corrected by estimating the energy dependence of the radiation widths. (For preceding period see CU-171.) (W.D.M.)

• Research Organization: Columbia Univ., New York. Pupin Cyclotron Lab.; and Columbia Univ., New York. George B. Pegram Lab.
• NSA Number: NSA-12-015787
• OSTI ID: 4313481
• Report Number(s): CU-174
• Country of Publication: United States
• Language: English

Related Subjects

ALPHA BEAMS-- NUMERICALS-- OXYGEN 16-- PHASE SHIFT-- SCATTERING
ALPHA PARTICLES-- ANGULAR DISTRIBUTION-- CARBON 13-- CROSS SECTIONS-- DEUTERON BEAMS-- ENERGY RANGE- - MASS-- NITROGEN 15-- NUCLEAR REACTIONS
ALPHA PARTICLES-- BORON 10-- CONFIGURATION-- ENERGY LEVELS-- ENERGY RANGE-- GAMMA RADIATION-- LITHIUM 7-- MONOCRYSTALS-- NEUTRON BEAMS-- NEUTRON DETECTION-- NUCLEAR REACTIONS-- SCINTILLATION COUNTERS-- SODIUM IODIDES-- THICKNESS
ALPHA PARTICLES-- ENERGY LEVELS-- EXCITATION-- GAMMA RADIATION-- MEASURED VALUES-- NEON 20-- NUCLEAR REACTIONS-- PROTON BEAMS-- SODIUM 23
ANGULAR DISTRIBUTION-- ELASTIC SCATTERING-- HELIUM 3-- NEUTRON BEAMS-- PL
PHYSICS