ELASTIC SCATTERING OF FAST NEUTRONS BY TRITIUM AND He$sup 3$

Journal Article · Thu Sep 15 00:00:00 EDT 1960 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.119.1981· OSTI ID:4139484

Seagrave, J D; Cranberg, L; Simmons, J E

Differential cross sections were obtained for the elastic scattering of neutrons by tritium and by He/sup 3/ at E/sub n/ = 1.0, the c.m. system. The Los Alamos large Van de Graaff accelerator and pulsed-beam time-of-flight facility were employed. The scattering samples were contained in small thin-walled stainless steel spheres. One-third mole of He/sup 3/ was contained at 5000 psi and one-half mole of tritium was prepared in the form of CaT/sub 2/. Absolute cross sections were determined from a comparison with the scattering from a thin shell of CH/sub 2/ at each energy, together with calibration of the relative sensitivity of the detector as a function of energy by the known forward yield of the T(p,n)He/sup 3/ reaction. The angular distributions for n-T scattering were in excellent agreement with the calculations of Bransden, Robertson, and Swan based on a Serber exchange force. The n-He/sup 3/ measurements favored qualitatively the Serber rather than the symmetrical exchange force used in the calculations, but the agreement was poorer than that obtained for n-T scattering. The polarization of elastically scattered 1 Mev neutrons was found to be less than 5% for both samples, unlike the strong polarization observed in n-He/sup 4/ scattering. (auth)

• Research Organization: Los Alamos Scientific Lab., N. Mex.
• NSA Number: NSA-14-024895
• OSTI ID: 4139484
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 119; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION-- CALCIUM HYDRIDES-- CARBON HYDRIDES-- CROSS SECTIONS-- DETECTION-- ELASTIC SCATTERING-- ENERGY RANGE-- FAST NEUTRONS-- MEASURED VALUES-- NEUTRON BEAMS-- NEUTRON SPECTROMETERS-- NUCLEAR MODELS-- NUCLEAR REACTIONS-- PERFORMANCE-- POLARIZATION-- PROTON BEAMS-- PULSES-- SCATTERING-- SENSITIVITY-- SPHERES-- STANDARDS-- STEELS-- TRITIUM-- VAN DE GRAAFF ACCELERATORS-- VELOCITY
ANGULAR DISTRIBUTION-- CARBON HYDRIDES-- CROSS SECTIONS-- DETECTION-- ELASTIC SCATTERING-- ENERGY RANGE-- FAST NEUTRONS-- HELIUM 3-- MEASURED VALUES-- NEUTRON BEAMS-- NEUTRON SPECTROMETERS-- NUCLEAR MODELS-- NUCLEAR REACTIONS-- PERFORMANCE-- POLARIZATION
PHYSICS