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ID 19318
本文ファイル
著者
Sharapov, E. I.
Bowman, J. D.
Crawford, B. E.
Delheij, P. P. J.
Frankle, C. M.
Knudson, J. N.
Lowie, L. Y.
Lynch, J. E.
Masaike, Akira
Matsuda, Yasuyuki
Mitchell, G. E.
Penttilä, S. I.
Postma, H.
Roberson, N. R.
Seestrom, S. J.
Stephenson, S. L.
Yen, Y.-F.
Yuan, V. W.
抄録(英)
The analysis of parity nonconservation (PNC) measurements performed on 232Th by the TRIPLE Collaboration has been extended to include the neutron energy range of 250 to 1900 eV. Below 250 eV all ten statistically significant parity violations have the same sign. However, at higher energies PNC effects of both signs were observed in the transmission of longitudinally polarized neutrons through a thick thorium target. Although the limited experimental energy resolution precluded analysis in terms of the longitudinal asymmetry, parity violations were observed and the cross section differences for positive and negative neutron helicities were obtained. For comparison, a similar analysis was performed on the data below 250 eV, for which longitudinal asymmetries were obtained previously. For energies below 250 eV, the p-wave neutron strength functions for the J= 1/2 and J = 3/2 states were extracted: S11/2=(1.68±0.61) × 10-4 and S13/2=(0.75±0.18) × 10-4. The data provide constraints on the properties of local doorway states proposed to explain the PNC sign effect in thorium.
掲載誌名
Physical Review C - Nuclear Physics
62巻
2号
開始ページ
025501-1
終了ページ
025501-7
出版年月日
2000-01-18
出版者
American Physical Society
ISSN
0556-2813
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2000 The American Physical Society.
関連情報URL
部局名
先端物質科学研究科