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

被引：37

作者：

Snow, W. M. ^{[1
]}

Bass, C. D. ^{[2
]}

Bass, T. D. ^{[2
]}

Crawford, B. E. ^{[3
]}

Gan, K. ^{[4
]}

Heckel, B. R. ^{[5
]}

Luo, D. ^{[1
]}

Markoff, D. M. ^{[6
]}

Micherdzinska, A. M. ^{[4
]}

Mumm, H. P. ^{[2
]}

Nico, J. S. ^{[2
]}

Opper, A. K. ^{[4
]}

Sarsour, M. ^{[7
]}

Sharapov, E. I. ^{[8
]}

Swanson, H. E. ^{[5
]}

Walbridge, S. B. ^{[1
]}

Zhumabekova, V. ^{[9
]}

机构：

[1] Indiana Univ, CEEM, Bloomington, IN 47408 USA

[2] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

[3] Gettysburg Coll, Gettysburg, PA 17325 USA

[4] George Washington Univ, Washington, DC 20052 USA

[5] Univ Washington, CENPA, Seattle, WA 98195 USA

[6] N Carolina Cent Univ, TUNL, Durham, NC 27707 USA

[7] Georgia State Univ, Atlanta, GA 30303 USA

[8] Joint Inst Nucl Res, Dubna 141980, Russia

[9] Al Farabi Kazakh Natl Univ, Alma Ata 050038, Kazakhstan

来源：

PHYSICAL REVIEW C | 2011年 / 83卷 / 02期

基金：

美国国家科学基金会;

关键词：

PROTON-PROTON-SCATTERING; CIRCULAR-POLARIZATION; NON-CONSERVATION; NONCONSERVATION; SEARCH;

D O I：

10.1103/PhysRevC.83.022501

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We report an upper bound on parity-violating neutron spin rotation in He-4. 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 He-4 is d phi/dz = [+ 1.7 +/- 9.1(stat.) +/- 1.4(sys.)] x 10(-7) rad/m. The statistical uncertainty is smaller than current estimates of the range of possible values of d phi/dz in n+He-4.

引用

页数：5

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