Time-Reversal Invariance and th_{2}^{0} Decay

FIG. 4. Dependence of the lifetime on the ratio, R, of yields in the two exposures. Curve a is computed with the use of a spectrum of E 's derived from an energy-dependent matrix element of the form y2 —1, Gaussian momentum distribution in the target nucleus, and isotropic angular distribution in the center-of-mass system. Curve b has isotropic and energy-independent matrix element, and Fermi momentum distribution. Curve c has energyindependent matrix element, Gaussian distribution, and cose angular dependence in the center-of-mass system.