Upper bound on parity-violating neutron spin rotation in {sup 4}He

Journal Article · Tue Feb 15 00:00:00 EST 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.022501· OSTI ID:21499398

Snow, W M; Luo, D; Walbridge, S B ^[1]; Bass, C D; Bass, T D; Mumm, H P; Nico, J S ^[2]; Crawford, B E ^[3]; Gan, K; Micherdzinska, A M; Opper, A K ^[4]; Heckel, B R; Swanson, H E ^[5]; Markoff, D M ^[6]; Sarsour, M ^[7]; Sharapov, E I ^[8]; Zhumabekova, V ^[9]

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1. Indiana University/CEEM, 2401 Milo B. Sampson Lane, Bloomington, Indiana 47408 (United States)
2. National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899 (United States)
3. Gettysburg College, 300 North Washington Street, Gettysburg, Pennsylvania 17325 (United States)
4. The George Washington University, 725 21st Street NW, Washington, DC 20052 (United States)
5. University of Washington/CENPA, Box 354290, Seattle, Washington 98195 (United States)
6. North Carolina Central University/TUNL, 1801 Fayetteville Street, Durham, North Carolina 27707 (United States)
7. Georgia State University, 29 Peachtree Center Avenue, Atlanta, Georgia 30303-4106 (United States)
8. Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna (Russian Federation)
9. Al-Farabi Kazakh National University, Al-Farabi Ave. 71, 050038 Almaty (Kazakhstan)

We report an upper bound on parity-violating neutron spin rotation in {sup 4}He. This experiment 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. The experiment was performed at the NG-6 slow-neutron beamline at the National Institute of Standards and Technology (NIST) Center for Neutron Research. Our result for the neutron spin rotation angle per unit length in {sup 4}He is d{phi}/dz=[+1.7{+-}9.1(stat.){+-}1.4(sys.)]x10{sup -7} rad/m. The statistical uncertainty is smaller than current estimates of the range of possible values of d{phi}/dz in n+{sup 4}He.

• OSTI ID: 21499398
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 2; Other Information: DOI: 10.1103/PhysRevC.83.022501; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCURACY
COMPARATIVE EVALUATIONS
HEAVY NUCLEI
HELIUM 4
OPTICAL ACTIVITY
PARITY
ROTATION
SLOW NEUTRONS
SPIN
ANGULAR MOMENTUM
BARYONS
ELEMENTARY PARTICLES
EVALUATION
EVEN-EVEN NUCLEI
FERMIONS
HADRONS
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MOTION
NEUTRONS
NUCLEI
NUCLEONS
OPTICAL PROPERTIES
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
STABLE ISOTOPES