Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 612, Issue 1, Pages 69-82Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2009.10.055
Keywords
Cold neutrons; Cryogenic targets; Liquid helium; Neutron physics; Nucleon-nucleon weak interaction; Parity-violation; Polarized neutrons
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Funding
- NSF [PHY-0457219, PHY-0758018, PHY-9804038]
- DOE [DE-FG02-87ER41020]
- Direct For Mathematical & Physical Scien
- Division Of Physics [0758018] Funding Source: National Science Foundation
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A liquid helium target system was designed and built to perform a precision measurement of the parity-violating neutron spin rotation in helium due to the nucleon-nucleon weak interaction The. measurement employed a beam of low energy neutrons that passed through a crossed neutron polarizer-analyzer pair with the liquid helium target system located between them. Changes between the target states generated differences in the beam transmission through the polarizer-analyzer pair. The amount of parity-violating spin rotation was determined from the measured beam transmission asymmetries. The expected parity-violating spin rotation of order 10(-6) rad placed severe constraints on the target design. In particular, isolation of the parity-odd component of the spin rotation from a much larger background rotation caused by magnetic fields required that a nonmagnetic cryostat and target system be supported inside the magnetic shielding, while allowing nonmagnetic motion of liquid helium between separated target chambers. This paper provides a detailed description of the design, function, and performance of the liquid helium target system. Published by Elsevier B.V.
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