New instrumental effects in fast neutron polarization measurements

doi:10.1016/0168-9002(89)90381-1

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume 274, Issues 1–2, 1 January 1989, Pages 207-209

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Abstract

It is pointed out that measurements of the analyzing power A_y(θ) for scattering of polarized fast neutrons are subject to certain instrumental effects which have so far been neglected. As an illustration, np scattering at 10 MeV is discussed. It is shown that neutron scattering by carbon in the neutron detector causes an anomaly in A_y(θ) for angles θ when the energy of the scattered neutrons is near a n + ¹²C resonance.

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Cited by (5)

Analyzing power in nd elastic scattering at E<sup>n</sup><inf>lab</inf>=3 MeV. Measurement and calculation
1993, Physics Letters B
A precision measurement of the neutron-deuteron analyzing power below the deuteron breakup threshold is presented and compared to rigorous 3N calculations based on the Argonne AV 14, Bonn B, Nijmegen and Paris potentials. A significant discrepancy between theory and experiment is found, similar to that seen at higher energies. A modification of the NN interaction which includes charge independence breaking in the ³P_J partial waves is discussed which improves the description of the data at all energies.
The low-energy neutron-deuteron analyzing power and the <sup>3</sup>P<inf>0,1,2</inf> interactions of nucleon-nucleon potentials
1991, Physics Letters B
Data for the analyzing power A_y(θ) for the elastic scattering of neutrons from deuterons have been measured at 5.0, 6.5 and 8.5 MeV to an accuracy of ±0.0035. Surprisingly large differences have been observed at these low energies between the data and rigorous Faddeev calculations using the Paris and Bonn B nucleon-nucleon potentials. The A_y(θ) data provide a stringent test for our present understanding of the on-shell and off-shell ³P_0,1,2 nucleon-nucleon interactions.
Corrections for the polarization-dependent efficiency and new neutron-proton analyzing power data at 7.6 MeV
2010, Physical Review C - Nuclear Physics
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1992, Physical Review C

^∗: Present address: SAIC, 10401 Roselle Street, San Diego, CA 92121, USA.

^∗∗: Present address: Institut für Mittelenergiephysik, ETH-Hönggerberg, CH-8093 Zurich, Switzerland.

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New instrumental effects in fast neutron polarization measurements

Abstract

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Instr. and Meth.