3,714 research outputs found
Muon capture in nuclei: an ab initio approach based on quantum Monte Carlo methods
An ab initio quantum Monte Carlo method is introduced for calculating total
rates of muon weak capture in light nuclei with mass number . As a
first application of the method, we perform a calculation of the rate in He
in a dynamical framework based on realistic two- and three-nucleon interactions
and realistic nuclear charge-changing weak currents. The currents include one-
and two-body terms induced by - and -meson exchange, and
-to- excitation, and are constrained to reproduce the empirical
value of the Gamow-Teller matrix element in tritium. We investigate the
sensitivity of theoretical predictions to current parametrizations of the
nucleon axial and induced pseudoscalar form factors as well as to two-body
contributions in the weak currents. The large uncertainties in the measured
values obtained from bubble-chamber experiments (carried out over 50 years ago)
prevent us from drawing any definite conclusions.Comment: 6 pages, 1 figur
The Asypow S(plus) Library for Asymptotic Power Calculations
The asypow library consists of routines written in the S language that calculate power and related quantities utilizing asymptotic methods. A paper describing these methods with examples is in preparation [1]. Two methods are available. The likelihood ratio method (LR) is described in [2]. Another general method appears recently in [3]; and we designate it the SMO method after the initials of the authors.
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