نتایج جستجو برای: neutron production
تعداد نتایج: 648123 فیلتر نتایج به سال:
introduction electron linear accelerator (linac) can be used for neutron production in boron neutron capture therapy (bnct). bnct is an external radiotherapeutic method for the treatment of some cancers. in this study, varian 2300 c/d linac was simulated as an electron accelerator-based photoneutron source to provide a suitable neutron flux for bnct. materials and methods photoneutron sources w...
An accelerator-based BNCT (Boron Neutron Capture Therapy) facility is now under construction and the entire system including the patient treatment system will be installed in the Ibaraki Medical Center for Advanced Neutron Therapy (tentative name). Investigation of an 8-MeV proton linac and of a beryllium-based neutron production target for the BNCT is progressing. We are aiming at the design a...
High-fidelity, time-resolved measurements of the neutron flux from the implosion of DTandlor DD-filled capsules have been a challenging problem for the international inertial-confinement-fusion (ICF) community. A measure of the neutron production rate can provide valuable information on the quaIity of the implosion, such as the confinement time of the plasma. A time-resolving neutron detector i...
[1] Spacecraft observations in the inner heliosphere offer the first opportunity to measure 1–10 MeV solar neutrons. We discuss the cross sections for neutron production in solar flares and calculate the escaping neutron spectra for monoenergetic and power law particle spectra at the Sun and at the distance (0.48 AU) and observation angle of MESSENGER at the time of its reported detection of lo...
The current status of fast neutron production for therapy is discussed in the light of decreasing interest in the neutron therapy programme around the world. Some suggestions are made and problems highlighted where the nuclear physics and the accelerator communities can contribute significantly in order to examine whether the physical characteristics of the neutron beams can be further improved...
Beginning from massive binaries in the Galaxy we evolve black–hole, neutron–star binaries and binary neutron stars, such as the Hulse–Taylor system PSR 1913+16. The new point in our evolution is a quantitative calculation of the accretion of matter by a neutron star in common envelope evolution which sends it into a black hole. We calculate the mass of the latter to be ∼ 2.4 M⊙. The black hole ...
General topics of interest center around investigation of the structure, dynamics (vibrational and diffusive), and composition (speciation) of molecules at interfaces and in other confining geometries (layers and porous media). Length and time scales of interest are typically probed by neutron scattering techniques such as quasielastic neutron scattering, inelastic neutron scattering, SANS, and...
Background: Miniature neutron sources with high neutron flux have abundant applications in medicine, industry and researches. The most important general characteristic of miniature neutron sources is their diameter which is 3mm in average. In this research, we have surveyed and designed an Am-Be miniature neutron source fabrication. Materials and Methods: This investigation resulted in creation...
We propose to study the neutron-deficient (201−206Fr) and neutron-rich (218,219,229−232Fr) francium isotopes with high-resolution collinear resonance ionization spectroscopy. Extraction of the quadrupole moments will provide information on the nature of the deformation in the neutron-deficient nuclei and the octupole deformation suggested in the neutron-rich nuclei. The presence of the decay sp...
Differential cross sections for dijet photoproduction in association with a leading neutron using the reaction e+ + p → e+ + n + jet + jet +Xr have been measured with the ZEUS detector at HERA using an integrated luminosity of 6.4 pb−1. The fraction of dijet events with a leading neutron in the final state was studied as a function of the jet kinematic variables. The cross sections were measure...
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