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Title: Experimental upper bound and theoretical expectations for parity-violating neutron spin rotation in He 4

Journal Article · · Physical Review C

Neutron spin rotation is expected from quark-quark weak interactions in the standard model, which induce weak interactions among nucleons that violate parity. We present the results from an experiment searching for the effect of parity violation via the spin rotation of polarized neutrons in a liquid 4 He medium. The value for the neutron spin rotation angle per unit length in 4He, dφ/dz = [+2.1 ± 8.3 (stat.) +2.9 – 0.2(sys.)] × 10–7 rad/m, is consistent with zero. The result agrees with the best current theoretical estimates of the size of nucleon-nucleon weak amplitudes from other experiments and with the expectations from recent theoretical approaches to weak nucleon-nucleon interactions. In this paper we review the theoretical status of parity violation in the n + 4He system and discuss details of the data analysis leading to the quoted result. Analysis tools are presented that quantify systematic uncertainties in this measurement and that are expected to be essential for future measurements.

Research Organization:
George Washington Univ., Washington, DC (United States); Univ. of Washington, Seattle, WA (United States); Georgia State Univ., Atlanta, GA (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AI02-93ER40784; FG02-95ER40901; SC0010443; FG02-97ER41020 MOD 0053; FG02-97ER41020
OSTI ID:
1542694
Alternate ID(s):
OSTI ID: 1610292
Journal Information:
Physical Review C, Journal Name: Physical Review C Vol. 100 Journal Issue: 1; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

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Measurement of the total neutron-scattering cross-section ratios of noble gases of natural isotopic composition using a pulsed neutron beam journal December 2019

Figures / Tables (10)


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