42 research outputs found
The Effects of Variations in Nuclear Processes on Type I X-Ray Burst Nucleosynthesis
Type I X-ray bursts are violent stellar events that take place on the
H/He-rich envelopes of accreting neutron stars. We have investigated the role
played by uncertainties in nuclear processes on the nucleosynthesis
accompanying these explosive phenomena. Two different approaches have been
adopted, in the framework of post-processing calculations. In the first one,
nuclear rates are varied individually within uncertainties. Ten different
models, covering the characteristic parameter space for these stellar events,
have been considered. The second, somewhat complementary approach involves a
Monte Carlo code in which all nuclear rates are randomly varied within
uncertainty limits simultaneously. All in all, about 50,000 post-processing
calculations, with a network containing 606 nuclides (H to 113Xe) and more than
3500 nuclear processes, have been performed in this work. A brief comparison
between both procedures is outlined together with an overall account of the key
nuclear reactions whose uncertainties have the largest impact in our X-ray
burst nucleosynthesis studies.Comment: 91 pages, submitted to "The Astrophysical Journal Suppl. Series
Bayesian analysis of repeated measurements affected by a systematic error and its application to conformity assessment
The Bayesian analysis of a series of correlated indications of an unknown quantity is here presented when they are modelled by a joint Gaussian distribution and their covariance is assumed to be the (known) squared uncertainty associated with a systematic effect common to all the indications. An interesting application of the obtained results to the conformity assessment of a series production is also presented. A criterion is derived so that at least a portion p1 of the series production shows to have a characteristic value below a prescribed limit, with a probability not less than p2