نتایج جستجو برای: neutron decay
تعداد نتایج: 117888 فیلتر نتایج به سال:
The neutron component is likely an inevitable ingredient of a gamma-ray burst (GRB) baryonic fireball, in essentially all progenitor scenarios. The suggestion that the neutron composition may alter the early afterglow behavior has been proposed, but there is no detailed calculation so far. In this paper, within the popular internal shock scenario of GRBs, we calculate the early optical afterglo...
A neutron component is practically inevitable in baryonic fireballs of gamma-ray bursts (GRBs). At late stages of the explosion, the neutrons fully decouple from the ion ejecta and coast freely. The presence of the neutron ejecta qualitatively changes the mechanism of the GRB afterglow. The neutrons lead the decelerating blast wave and gradually decay, leaving behind a trail of the decay produc...
We calculate the ground, first intrinsic excited states and density distribution for neutron-rich thorium and uranium isotopes, within the framework of relativistic mean field(RMF) approach using axially deformed basis. The total nucleon densities are calculated, from which the cluster-structures inside the parent nuclei are determined. The possible modes of decay, like α-decay and β -decay are...
Ultramagnetized neutron stars or magnetars have been invoked to explain several astrophysical phenomena. We examine how the magnetic field of a magnetar will decay over time and how this decay affects the cooling of the object. We find that for sufficiently strong nascent fields, field decay alters the cooling evolution significantly relative to similarly magnetized neutron stars with constant ...
Data from the Sudbury Neutrino Observatory have been used to constrain the lifetime for nucleon decay to "invisible" modes, such as n-->3nu. The analysis was based on a search for gamma rays from the deexcitation of the residual nucleus that would result from the disappearance of either a proton or neutron from 16O. A limit of tau(inv)>2 x 10(29) yr is obtained at 90% confidence for either neut...
Neutron-capture elements in low metallicity Galactic halo stars vary widely both in overall contents and detailed abundance patterns. This review discusses recent observational results on the n-capture elements, discussing the implications for early Galactic nucleosynthesis of: (a) the star-to-star " bulk " variations in the n-capture/Fe abundance ratios; (b) the distinct signature of rapid n-c...
The decay of the very neutron-rich nucleus 100 Rb has been studied by γ-spectroscopy of on-line mass-separated samples. Schemes for β-decay to 100 Sr and βn-decay to 99 Sr are presented. New sets of transitions in 99 Sr and 100 Sr with identical energies are observed. All identical bands so far observed in neutron-rich Sr isotopes obey a simple energy rule valid for even-even, odd-even and odd-...
The recent results of the PIBETA experiment strongly suggest the presence of a non(V−A) anomalous interaction in the radiative pion decay. The same interaction should inevitably contribute to the neutron decay and in particular it should affect the Vud determination. This paper is dedicated to the prediction of the eventual discrepancy in Vud extracted from the super-allowed 0 + → 0 Fermi trans...
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