Investigations of parity violation and interference effects in 235U fission induced by resonance neutrons

Alfimenkov, V.P.; Chernikov, A. N.; Lason, L.; Mareev, Yu.D.; Novitski, V.V.; Pikelner, L.B.; Skoy, V. R.; Tsulaya, M. I.; Gagarski, A. M.; Guseva, I. S.; Golosovskaya, S.P.; Krasnoschokova, I.A.; Morozov, A. M.; Petrov, G. A.; Petrova, V. I.; Petukhov, A. K.; Pleva, Yu.S.; Sokolov, V. E.; Val’ski, G. V.; Soloviev, S. M.

doi:10.1016/s0375-9474(98)00577-6

Cited by 8 publications

(1 citation statement)

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“…One could also search for large parity-odd effects in the (n, γ) channel for nuclei that undergo neutron-induced fission and try to confirm and extend the many large P-odd asymmetries already measured in the fission channel [50,51,52,53,54,4,55,56,57,58,59,60]. In particular one could measure the P-odd asymmetries in the (n, γ) channel in very low energy resonances in 235 U [61,62], which is a nucleus that can be safely handled and supplied at the LANSCE facility. There is an already-proven method for nuclear polarization of 235 U using the very large hyperfine fields produced at the nucleus in the low-temperature ferromagnetic phase of uranium sulfide.…”

Section: Discussionmentioning

confidence: 84%

A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission

Schaper

Auton

Barrón‐Palos

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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We describe a modular apparatus for use in parity-violation measurements in epithermal neutron-nucleus resonances with high instantaneous neutron fluxes at the Manuel Lujan Jr. Neutron Scattering Center at Los Alamos National Laboratory. This apparatus is designed to conduct high-precision measurements of the parity-odd transmission asymmetry of longitudinally polarized neutrons through targets containing nuclei with p-wave neutronnucleus resonances in the 0.1-10 eV energy regime and to accommodate a future search for time reversal violation in polarized neutron transmission through polarized nuclear targets. The apparatus consists of an adjustable neutron and gamma collimation system, a 3 He-4 He ion chamber neutron flux monitor, two identical cryostats for target cooling, an adiabatic eV-neutron spin flipper, a near-unit efficiency 6 Li-7 Li scintillation detector operated in current mode, a flexible CAEN data acquisition system, and a neutron spin filter based on spin-exchange optical pumping of 3 He gas. We describe the features of the apparatus design devoted to the suppression of systematic errors in parity-odd asymmetry measurements. We describe the configuration of the apparatus used to conduct a precision measurement of parity violation at the 0.7 eV p-wave resonance in 139 La which employs two identical 139 La targets, one to polarize the beam on the p-wave resonance using the weak interaction and one to analyze the polarization.

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Section: Discussionmentioning

confidence: 84%