Study of Neutron–Nuclear Spin Correlation Term with a Polarized Xe Target

JPS Conf. Proc. 33, 011116 (2021) [6 pages]

Proceedings of the 3rd J-PARC Symposium (J-PARC2019)

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Study of Neutron–Nuclear Spin Correlation Term with a Polarized Xe Target

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¹JAEA, Tokai, Ibaraki 319-1195, Japan

²CROSS, Tokai, Ibaraki 319-1106, Japan

³Dept. of Physics, Nagoya University, Nagoya 464-8602, Japan

⁴KEK, Tsukuba, Ibaraki 305-0801, Japan

Received January 6, 2020

Study of a correlation term, s · I, of a neutron spin s and a target nuclear spin I is important in investigating fundamental symmetry breaking in neutron-nuclear interactions, because it interferes with parity and time reversal non-conserving terms. Xe is an interesting material because a large parity non-conserving effect around neutron resonance peak has been observed, and also because its spin can be polarize to 10⁻²–10⁻¹ at pressures of 10⁻¹–10⁰ atm by using a spin-exchange optical-pumping method. For this study, we plan to measure the spin-dependent cross section and neutron spin rotation, which are predicted to depend on neutron energy around the resonance peaks. As a first step, we measured a neutron polarizing ability caused by the spin-dependent cross section at a 9.6 eV s-wave resonance peak of ¹²⁹Xe when unpolarized neutrons transmit through the polarized Xe target, and obtained a significant value of ∼10⁻² as a preliminary result.

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https://doi.org/10.7566/JPSCP.33.011116

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