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>238</mn></mrow></msup></mrow><mi mathvariant="normal">U</mi></math></span>

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

doi:10.1103/PhysRevC.58.1225

Parity nonconservation in neutron resonances in $^{238} U$

B. E. Crawford, J. D. Bowman, P. P. J. Delheij, C. M. Frankle, M. Iinuma, J. N. Knudson, L. Y. Lowie, A. Masaike, Y. Matsuda, G. E. Mitchell, S. I. Penttilä, H. Postma, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, S. L. Stephenson, Y.-F. Yen, and V. W. Yuan (TRIPLE Collaboration)

Phys. Rev. C 58, 1225 – Published 1 August 1998

Abstract

Parity nonconservation (PNC) was studied for 24 p-wave neutron resonances in $^{238} U$ from 10 to 300 eV by measuring the helicity dependence of the total neutron cross section with an improved experimental apparatus. Six resonances show statistically significant (greater than $2.9 σ)$ parity violation. An analysis treating the PNC matrix elements as random variables yields a root-mean-square PNC matrix element ${M = 0.67}_{- 0.16}^{+ 0.24}$ meV. The corresponding weak spreading width $Γ_{w} {= (1.35}_{- 0.64}^{+ 0.97}) \times 10^{- 7}$ eV.

Received 6 April 1998

DOI:https://doi.org/10.1103/PhysRevC.58.1225

Authors & Affiliations

B. E. Crawford^1,*, J. D. Bowman², P. P. J. Delheij³, C. M. Frankle², M. Iinuma^4,†, J. N. Knudson², L. Y. Lowie^5,‡, A. Masaike⁴, Y. Matsuda⁴, G. E. Mitchell⁵, S. I. Penttilä², H. Postma⁶, N. R. Roberson¹, S. J. Seestrom², E. I. Sharapov⁷, S. L. Stephenson^5,§, Y.-F. Yen^2,∥, and V. W. Yuan² (TRIPLE Collaboration)

¹Duke University, Durham, North Carolina 27708Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308
²Los Alamos National Laboratory, Los Alamos, New Mexico 87545
³TRIUMF, Vancouver, British Columbia, Canada V6T 2A3
⁴Department of Physics, Kyoto University, Kyoto 606-8502, Japan
⁵North Carolina State University, Raleigh, North Carolina 27695-8202Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308
⁶University of Technology, Delft, 2600 GA, the Netherlands
⁷Joint Institute for Nuclear Research, 141980 Dubna, Russia

^*Present address: North Carolina State University, Raleigh, NC 27695-8202 and Gettysburg College, Gettysburg, PA 17325.
^†Present address: Hiroshima University, Hiroshima-Ken 739-8526, Japan.
^‡Present address: McKinsey and Company, Atlanta, GA 30303.
^§Present address: Gettysburg College, Gettysburg, PA 17325.
^∥Present address: Wake Forest University School of Medicine, Winston-Salem, NC 27157.

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Vol. 58, Iss. 2 — August 1998

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