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Extent of simultaneous parity and time violation in 182W

Griffiths, A. and Vogel, P. (1991) Extent of simultaneous parity and time violation in 182W. Physical Review C, 44 (3). pp. 1195-1203. ISSN 0556-2813. doi:10.1103/PhysRevC.44.1195.

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In order to relate nuclear gamma-ray distributions to the fundamental parity-time- (PT-) and parity- (P-) violating meson-nucleon interaction, we analyze the case of the mixed (E1,M2,E3) 1189-keV gamma ray in 182W which is populated in the decay of cryogenically oriented 182Ta. Within the framework of the quasiparticle random-phase approximation we calculate the value of the complex ‘‘irregular’’ mixing ratio ɛ(E2¯/M2) for this transition. We estimate that this mixing ratio will have a P-violating real part of ‖ɛ‖cosη≃5×10-5 which implies an observable forward-backward asymmetry (〈J〉⋅k) in the 1189-keV gamma-ray directional distribution of OP≃2×10^-5 at 10 mK. For the PT-violating imaginary part we find ‖ɛ‖sinη≃200g̃ πNN(I=1), where g̃ πNN(I=1) is the strength of the isovector PT-violating pion-nucleon coupling. An upper limit to this constant of ≲3×10^-10 may be obtained from the electric dipole moment of the neutron. Whence we conclude that at 10 mK one needs to measure the PT-violating correlation (〈J〉⋅k2)(〈J〉⋅k1×k2) to an accuracy of OPT≲2×10^-8 in order to improve the limit on g̃ πNN(I=1) set by the neutron electric dipole moment.

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Vogel, P.0000-0003-0587-5466
Additional Information:©1991 The American Physical Society Received 18 March 1991 We would like to thank Dr. F. Boehm and Dr. P. Herczeg for useful discussions. The numerical calculations described here have been performed on the Cray Y-MP at the San Diego Supercomuting Center; its assistance is gratefully acknowledged. This work was supported by the U.S. Department of Energy under Contract No. DE-F603-88ER-40397.
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Deposited On:10 Nov 2006
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