Several directions of the demand for decay data in nuclear astrophysics are discussed for radionuclides near the valley of nuclear stability. The current half-life and gamma-ray intensity evaluation results are presented for some radionuclides of astrophysical interest. An extended list of such nuclides is offered for their nuclear characteristics to be further evaluated by the Decay Data Evalu...

ABSTRACT. Probability theory is applied to the problem of estimating the ratio of the amplitudes of two sinusoids in nuclear magnetic resonance data. The posterior probability-density for the amplitude ratio is derived independent of the phase, frequencies, decay-rate constants, variance of the noise, and the amplitude of the other sinusoid. This probability-density function is then applied in ...

We present here a measurement of the rate for pion beta decay (&t3), & —n'e'v, made with the use of a new technique at the Clinton P. Anderson Meson Physics Facility (LAMPF), which is substantially more precise than previous measurements. The conserved-vector-current (CVC) hypothesis, ' a cornerstone of the unified theory of electromagnetic and weak interactions, relates the rate for ~P directl...

The second unique forbidden electron capture (EC) decay in 123 Te is calculated in the Proton-Neutron Quasi-Particle Random Phase Approximation (pn-QRPA), making use of Skyrme-type residual interactions. As in the allowed Gamow-Teller channel, the forbidden nuclear matrix elements depend sensitively on the competition between particle-hole and particle-particle correlations. Theory provides a l...

Probability theory is applied to the problem of estimating the amplitudes of the sinusoids in nuclear magnetic resonance data containing two exponentially decaying sinusoids. The posterior probability-density of one of the amplitudes is derived independent of the phases, frequencies, decay-rate constants, variance of the noise, and the amplitude of the other sinusoid. This probability-density f...

We study double gamma ($\gamma\gamma$) decay nuclear matrix elements (NMEs) for a wide range of nuclei from titanium to xenon, and explore their relation neutrinoless double-beta ($0\nu\beta\beta$) NMEs. To favor the comparison, we focus on double-magnetic dipole transitions in final $\beta\beta$ nuclei, particular $\gamma\gamma$ isobaric analog initial state into ground state. For with equal-e...

Based on the short-distance expansion of currents in the heavy quark effective theory, we derive the exact expressions for the heavyto-heavy meson and baryon weak decay form factors to order 1/mQ in the heavy quark expansion, and to all orders in perturbation theory. We emphasize that the Wilson coefficients in this expansion depend on a kinematic variable w̄ that is different from the velocity ...

There is a well known anomaly between the value of the Fermi decay constant extracted from super-allowed Fermi beta-decay of nuclear isotriplets and that required by unitarity of the Cabibbo-Kobayashi-Maskawa matrix. This discrepancy remains at the level of a few tenths of a percent after the most rigorous investigation of conventional nuclear and radiative corrections. Within the framework of ...