Parity nonconservation in neutron resonances in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>133</mn></mrow></msup></mrow><mi mathvariant="normal">Cs</mi></math></span>

E. I. Sharapov; J. D. Bowman; B. E. Crawford; P. P. J. Delheij; T. Haseyama; J. N. Knudson; L. Y. Lowie; A. Masaike; Y. Masuda; Y. Matsuda; G. E. Mitchell; S. I. Penttilä; H. Postma; N. R. Roberson; S. J. Seestrom; S. L. Stephenson; Y.-F. Yen; V. W. Yuan

doi:10.1103/PhysRevC.59.1772

Parity nonconservation in neutron resonances in $^{133} Cs$

E. I. Sharapov, J. D. Bowman, B. E. Crawford, P. P. J. Delheij, T. Haseyama, J. N. Knudson, L. Y. Lowie, A. Masaike, Y. Masuda, Y. Matsuda, G. E. Mitchell, S. I. Penttilä, H. Postma, N. R. Roberson, S. J. Seestrom, S. L. Stephenson, Y.-F. Yen, and V. W. Yuan

Phys. Rev. C 59, 1772 – Published 1 March 1999

Abstract

Spatial parity nonconservation (PNC) has been studied in the compound-nuclear states of $^{134} Cs$ by measuring the helicity dependence of the neutron total cross section. Transmission measurements on a thick $^{133} Cs$ target were performed by the time-of-flight method at the Manuel Lujan Neutron Scattering Center with a longitudinally polarized neutron beam in the energy range from 5 to 400 eV. A total of 28 new p-wave resonances were found, their neutron widths determined, and the PNC longitudinal asymmetries of the resonance cross sections measured. The value obtained for the root-mean-square PNC element ${M = (0.06}_{- 0.02}^{+ 0.25})$ meV in $^{133} Cs$ is the smallest among all targets studied. This value corresponds to a weak spreading width $Γ_{w} {= (0.006}_{- 0.003}^{+ 0.154}) \times 10^{- 7}$ eV.

Received 19 October 1998

DOI:https://doi.org/10.1103/PhysRevC.59.1772

Authors & Affiliations

E. I. Sharapov¹, J. D. Bowman², B. E. Crawford^3,*, P. P. J. Delheij⁴, T. Haseyama⁵, J. N. Knudson², L. Y. Lowie^6,†, A. Masaike^5,‡, Y. Masuda⁷, Y. Matsuda^5,§, G. E. Mitchell⁶, S. I. Penttilä², H. Postma⁸, N. R. Roberson³, S. J. Seestrom², S. L. Stephenson^6,∥, Y.-F. Yen^2,¶, and V. W. Yuan²

¹Joint Institute for Nuclear Research, 141980 Dubna, Russia
²Los Alamos National Laboratory, Los Alamos, New Mexico 87545
³Duke University, Durham, North Carolina 27708Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308
⁴TRIUMF, Vancouver, British Columbia, Canada V6T 2A3
⁵Physics Department, Kyoto University, Kyoto 606-01, Japan
⁶North Carolina State University, Raleigh, North Carolina 27695-8202Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308
⁷National Laboratory of High Energy Physics, Tsukuba-shi, 305, Japan
⁸Delft University of Technology, Delft, 2600 GA, The Netherlands

^*Present address: North Carolina State University, Raleigh, NC 27695-8202 and Gettysburg College, Gettysburg, PA 17325.
^†Present address: McKinsey and Company, Atlanta, GA 30303.
^‡Present address: Fukui University of Technology, 3-6-1 Gakuen, Fukui, Japan.
^§Present address: Institute of Physical and Chemical Research (RIKEN), Saitama, 351-0198, Japan.
^∥Present address: Gettysburg College, Gettysburg, PA 17325.
^¶Present address: Wake Forest University School of Medicine, Winston-Salem, NC 27157.

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Vol. 59, Iss. 3 — March 1999

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