Snow, W. M. and Anderson, E. and Barrón-Palos, L. and Bass, C. D. and Bass, T. D. and Crawford, B. E. and Fry, J. and Gan, K. and Heckel, B. R. and Luo, D. and Malone, R. C. and Markoff, D. M. and Micherdzinska, A. M. and Mumm, H. P. and Nico, J. S. and Opper, A. K. and Penn, S. and Santra, S. and Sarsour, M. and Sharapov, E. I. and Swanson, H. E. and Van Sciver, S. and Walbridge, S. B. and Zhumabekova, V. (2012) Parity violating neutron spin rotation in 4He and H. Il nuovo cimento C, 35 (4). pp. 57-62. ISSN 1826-9885
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Abstract
The weak interaction between nucleons leads to parity violation in various reaction observables. Neutron spin rotation, the rotation of the plane of polarization of a transversely polarized neutron beam passing through unpolarized matter, is an especially clear example of a breakdown in mirror symmetry. The Neutron Spin Rotation (NSR) Collaboration is engaged in an experimental program to observe parity-odd neutron spin rotation. We recently completed the first phase of an experiment to measure parity violating neutron spin rotation in 4He. Our result for the neutron spin rotation angle per unit length in 4He, dφ/dz = (+1.7 ± 9.1(stat.) ± 1.4(sys.)) × 10−7 rad/m, is the most sensitive search for neutron weak optical activity yet performed and represents a significant advance in precision in comparison to past measurements in heavy nuclei. This experiment was performed at the NG-6 slow neutron beamline at the National Institute of Standards and Technology (NIST) Center for Neutron Research. The systematic uncertainty is small enough to proceed to the second phase of the 4He measurement at the new NG-C slow neutron beamline under construction at NIST. The projected intensity of this beam is high enough to see parity odd neutron spin rotation in 4He and to seriously consider a future experiment to measure neutron spin rotation in hydrogen.
| Item Type: | Article |
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| Uncontrolled Keywords: | Charge conjugation, parity, time reversal, and other discrete symmetries ; Polarization phenomena in reactions ; Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 21 Apr 2020 18:16 |
| Last Modified: | 21 Apr 2020 18:16 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/17885 |
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