نتایج جستجو برای: neutron emission
تعداد نتایج: 223305 فیلتر نتایج به سال:
The neutron long counter NERO was built at the National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, for measuring b delayed neutron-emission probabilities. The detector was designed to work in conjunction with a b delay implantation station, so that b decays and b delayed neutrons emitted from implanted nuclei can be measured simultaneously. The high efficiency of ab...
In this paper we model the emission from a relativistically expanding ee pair plasma fireball originating near the surface of a heated neutron star. This pair fireball is deposited via the annihilation of neutrino pairs emanating from the surface of the hot neutron star. The heating of neutron stars may occur in close neutron star binary systems near their last stable orbit. We model the relati...
The neutrino energy emission rate due to formation of Cooper pairs of neutrons and protons in the superfluid cores of neutron stars is studied. The cases of singlet-state pairing with isotropic superfluid gap and triplet-state pairing with anisotropic gap are analysed. The neutrino emission due to the singlet-state pairing of protons is found to be greatly suppressed with respect to the cases o...
In proto-neutron stars with strong magnetic fields, the neutrino-nucleon scattering/absorption cross sections depend on the direction of neutrino momentum with respect to the magnetic field axis, a manifestation of parity violation in weak interactions. We study the deleptonization and thermal cooling (via neutrino emission) of proto-neutron stars in the presence of such asymmetric neutrino opa...
The cohesive energy of condensed matter in strong magnetic fields is a fundamental quantity characterizing magnetized neutron star surfaces. The cohesive energy refers to the energy required to pull an atom out of the bulk condensed matter at zero pressure. Theoretical models of pulsar and magnetar magnetospheres depend on the cohesive properties of the surface matter in strong magnetic fields....
Recent discovery of the afterglow emission from short gamma-ray bursts suggests that binary neutron star or black hole-neutron star binary mergers are the likely progenitors of these short bursts. The accretion of neutron star material and its subsequent ejection by the central engine implies a neutron-rich outflow. We consider here a neutron-rich relativistic jet model of short bursts, and inv...
We discuss pycnonuclear burning of highly exotic atomic nuclei in deep crusts of neutron stars, at densities up to 10 g cm. As an application, we consider pycnonuclear burning of matter accreted on a neutron star in a soft X-ray transient (SXT, a compact binary containing a neutron star and a lowmass companion). The energy released in this burning, while the matter sinks into the stellar crust ...
In many nuclear reactions, one or more excited primary fragments are formed which decay by the evaporation of nucleons and light clusters. This evaporation process can substantially alter the proton-neutron asymmetry of the initial primary fragments. In a study of complex fragment emission in fusion reactions, the Z values of the detected secondary fragments were measured @1#. In order to estim...
Neutron emission in E=8, 10, 13, and 16 MeV/nucleon 20Ne+ 159Tb, 169Tm induced fission reactions has been further studied. The 4p configuration of the DEMON neutron multidetector allowed a detailed investigation of the preand postscission properties as functions of the fission parameters. The emission of the neutrons from their respective sources was found to be isotropic to a high degree. The ...
Modern versions of Aston’s mass spectrometer enable measurements of two quantities – isotope abundances and masses – that tell the Sun’s origin and operation. Isotope analyses of meteorites, the Earth, Moon, Mars, Jupiter, the solar wind, and solar flares over the past 45 years indicate that fresh, poorly-mixed, supernova debris formed the solar system. The iron-rich Sun formed on the collapsed...
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