Polarization of Li7(p, n)Be7 neutrons for 4 to 10 MeV protons

doi:10.1016/0029-5582(62)90356-5

Nuclear Physics

Volume 32, April–May 1962, Pages 510-516

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Abstract

The polarization of Li⁷(p, n)Be⁷ neutrons has been measured at nine proton energies between 4 and 10 MeV. The dependence of the polarization on reaction angle was determined at 4.0, 4.7, 5.9, 6.9, 7.9, 9.1 and 10.0 MeV. The polarizations were deduced from the asymmetry of n-He⁴ scattering. Neutrons which left Be⁷ in its ground state and first excited state were detected with approximately equal efficiency and were not resolved from each other.

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Cited by (3)

Polarization and differential cross section for neutrons elastically scattered from 12C
1972, Nuclear Physics, Section A
The polarization of the elastically scattered neutrons from ¹²C in the energy range E = 1.9–5.2 MeV has been measured at laboratory angles from 25° to 155°. Differential cross sections were also obtained for 4.7 and 5.2 MeV neutron energies. The data have been corrected for multiple scattering and finite geometry. A phase-shift analysis of polarization and cross-section data has been performed at 1.9, 4.7 and 5.2 MeV.
7Li(p, n)7Be neutron polarization measurements for E<inf>p</inf> = 3.0 to 5.5 MeV
1971, Nuclear Physics, Section A
Remeasurement of the neutron polarization from the 7Li(p, n)7Be reaction for 3 to 4 MeV protons
1971, Nuclear Physics, Section A
Polarizations of the neutrons emitted at 50° in the reaction ⁷Li(p, n)⁷Be were obtained in 50 keV steps for proton energies from 3 to 4 MeV to an accuracy of 0.014 for the n_o group. The solenoid spin-precession technique was employed to reduce instrumental asymmetries. Scattering through 90° to 110° from gaseous helium enclosed at high pressure in a thin walled cell was used as an analyzer. A search program was used to fit Gaussian functions to the asymmetries for both the n₀ and n₁ groups. At the lowest energies a time-of-flight system was employed to measure the polarization of the n₁ group. A polynomial is fit to the polarization values to provide an accurate calibration of the polarization at 50° lab in the range from 3 to 4 MeV proton energy.

^†: Work supported by the U.S. Atomic Energy Commission and by the Wisconsin Alumni Research Foundation.

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Nuclear Physics

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References (16)

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Cited by (3)

Polarization and differential cross section for neutrons elastically scattered from <sup>12</sup>C

<sup>7</sup>Li(p, n)<sup>7</sup>Be neutron polarization measurements for E<inf>p</inf> = 3.0 to 5.5 MeV

Remeasurement of the neutron polarization from the <sup>7</sup>Li(p, n)<sup>7</sup>Be reaction for 3 to 4 MeV protons