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• W2077115468 abstract "Taking into account in a simple but non-trivial way both off-mass-shell and meson-exchange effects, we calculate the second-class current (scc) contribution to asymmetries in nuclear mirror Gamow-Teller decays. No assumptions on the divergence of the scc are made but the previous result obtained for a divergenceless current is recovered straightforwardly from our formula. Of the plethora of parameters that can be brought in for a current with non-vanishing divergence, we confine ourselves to the minimum number (two) which still renders our calculation sufficiently realistic while retaining its predictive power. The two parameters - one associated with the off-shell phenomenon and the other with meson-exchange current - are determined from two pieces of experimental data on the A = 8 system (the averaged asymmetry δ obtainable from the total decay rates and the slope in the plot of δ versus the energy release) and predictions are made for the scc effects in other mirror transitions. On the average the expected scc contribution to mirror asymmetry δ is 2 to 5%, for both even- and odd-A nuclei. We reach the same conclusion as Wilkinson that the large residual asymmetry (≳10%) left unaccounted in odd-A nuclei must be nuclear in origin. The fundamental nucleon pseudotensor coupling constant implied by this result is still of the same order (∼1/M, where M is nucleon mass) as that of the weak magnetism or pseudoscalar terms. In the absence of kinematic suppression, this could induce large effects. Thus the ω-decay into π±e−+ν is expected to be as fast as any allowed first-class decay of a meson with comparable mass. The asymmetries in various correlation experiments (i.e. eη correlation and up-down asymmetry with respect to nuclear spin polarization) are predicted to be large enough to be measurable. We make a detailed analysis on whether, as conjectured by Lipkin, the meson-exchange current can build up coherently for large nuclei. The conclusion drawn therefrom is that such an enhancement does not materialize." @default.
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• W2077115468 date "1964-11-01" @default.
• W2077115468 modified "2023-09-27" @default.
• W2077115468 title "Nuclear matrix elements for the mirror decays of B12 and N12" @default.
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• W2077115468 doi "https://doi.org/10.1016/0031-9163(64)90701-2" @default.
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