High sensitivity of a future search for effects of <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>P</mi></math>-odd/<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>T</mi></math>-odd interactions on the 0.75 eV <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>p</mi></math>-wave resonance in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mover accent="true"><mi>n</mi><mo>⃗</mo></mover><mo>+</mo><msup><mrow></mrow><mn>139</mn></msup><mover accent="true"><mi>La</mi><mo>⃗</mo></mover></mrow></math> forward transmission determined using a pulsed neutron beam

R. Nakabe; C. J. Auton; S. Endo; H. Fujioka; V. Gudkov; K. Hirota; I. Ide; T. Ino; M. Ishikado; W. Kambara; S. Kawamura; A. Kimura; M. Kitaguchi; R. Kobayashi; T. Okamura; T. Oku; T. Okudaira; M. Okuizumi; J. G. Otero Munoz; J. D. Parker; K. Sakai; T. Shima; H. M. Shimizu; T. Shinohara; W. M. Snow; S. Takada; R. Takahashi; S. Takahashi; Y. Tsuchikawa; T. Yoshioka

doi:10.1103/PhysRevC.109.L041602

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High sensitivity of a future search for effects of $P$ -odd/ $T$ -odd interactions on the 0.75 eV $p$ -wave resonance in $\vec{n} +^{139} \vec{La}$ forward transmission determined using a pulsed neutron beam

R. Nakabe ¹, C. J. Auton^2,1, S. Endo^3,1, H. Fujioka⁴, V. Gudkov⁵, K. Hirota⁶, I. Ide¹, T. Ino⁶, M. Ishikado⁷ et al.

W. Kambara³, S. Kawamura^1,3, A. Kimura³, M. Kitaguchi¹, R. Kobayashi⁸, T. Okamura⁶, T. Oku^3,8, T. Okudaira^1,3, M. Okuizumi¹, J. G. Otero Munoz², J. D. Parker⁷, K. Sakai³, T. Shima⁹, H. M. Shimizu¹, T. Shinohara³, W. M. Snow², S. Takada^10,3, R. Takahashi³, S. Takahashi^8,3, Y. Tsuchikawa³, and T. Yoshioka¹¹

¹Department of Physics, Nagoya University, Furocho, Chikusa, Nagoya 464-8602, Japan
²Center for the Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47401, USA
³Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan
⁴Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
⁵Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208, USA
⁶High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
⁷Comprehensive Research Organization for Science and Society, Tokai, Ibaraki 319-1106, Japan
⁸Department of Beam Line Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
⁹Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
¹⁰Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8576, Japan
¹¹Research Center for Advanced Particle Physics, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan

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Phys. Rev. C 109, L041602 – Published 10 April, 2024

DOI: https://doi.org/10.1103/PhysRevC.109.L041602

Abstract

Neutron transmission experiments can offer a new type of highly sensitive search for time-reversal invariance violating (TRIV) effects in nucleon-nucleon interactions via the same enhancement mechanism observed for large parity violating (PV) effects in neutron-induced compound nuclear processes. In these compound processes, the TRIV cross section is given as the product of the PV cross section, a spin factor $κ$ , and a ratio of TRIV and PV matrix elements. We determined $κ$ to be $0.59 \pm 0.05$ for ${}^{139}{La} + n$ using both $(n, γ)$ spectroscopy and ( $\vec{n} +^{139} \vec{La}$ ) transmission. This result quantifies for the first time the high sensitivity of the ${}^{139}{La}$ 0.75-eV $p$ -wave resonance in a future search for effects of $P$ -odd/ $T$ -odd interactions in ( $\vec{n} +^{139} \vec{La}$ ) forward transmission.

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High sensitivity of a future search for effects of $P$ -odd/ $T$ -odd interactions on the 0.75 eV $p$ -wave resonance in $\vec{n} +^{139} \vec{La}$ forward transmission determined using a pulsed neutron beam

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High sensitivity of a future search for effects of P-odd/T-odd interactions on the 0.75 eV p-wave resonance in n⃗+139La⃗ forward transmission determined using a pulsed neutron beam

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High sensitivity of a future search for effects of $P$ -odd/ $T$ -odd interactions on the 0.75 eV $p$ -wave resonance in $\vec{n} +^{139} \vec{La}$ forward transmission determined using a pulsed neutron beam