نتایج جستجو برای: neutron yield
تعداد نتایج: 239350 فیلتر نتایج به سال:
Exploiting the energetic interaction of intense femtosecond laser pulses with deuterium clusters, it is possible to create conditions in which nuclear fusion results from explosions of these clusters. We have conducted high-resolution neutron time-of-flight spectroscopy on these plasmas and show that they yield fast bursts of nearly monochromatic fusion neutrons with temporal duration as short ...
The Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility measures the DT neutron spectrum from cryogenically layered inertial confinement fusion implosions. Yield, areal density, apparent ion temperature, and directional fluid flow are inferred from the MRS data. This paper describes recent advances in MRS measurements of the primary peak using new, thinner, reduced-area...
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As part of our fusion product-diagnostic development program, we have begun a series of experiments with 14 MeV neutrons generated in a Cockcroft-Walton accelerator. Two different detectors have been used to measure the neutron yield: a silicon SBD and a Cu foil. The energy of the emitted neutrons has been determined by using two spectrometers: the SBD and a 3 He proportional counter. The react...
The use of radioactive beams opens a new frontier for fusion studies. The coupling to the continuum can be explored with very loosely bound nuclei. Experiments were performed with beams of nuclei at or near the proton and neutron drip-lines to measure fusion and associated reactions in the vicinity of the Coulomb barrier. In addition, the fusion yield is predicted to be enhanced in reactions in...
Adopting the Lindblom-Detweiler formalism for polar oscillations of neutron stars, we study the w-mode oscillation and find that the Lagrangian change in pressure, measured by the physical quantity X , is negligibly small. Based on this observation, we develop the generalised inverse-Cowling approximation (GICA) with the approximation X = X ′ = 0, where X ′ is the derivative of X with respect t...
A new design is presented for a time-ofight neutron spectrometer that uses a shaped scattering foil to generate deuteron recoils. It is shown that the number of recoils can be substantially increased by utilizing a three-dimensional, deuterated scattering foil in the shape of an ellipsoid, which maintains the time-ofight dispersion present originally in the neutrons. The time-integrated neutron...
OAO1657–415 is only the seventh eclipsing X-ray pulsar known and therefore has the potential to yield only the seventh mass of a neutron star in an X-ray binary. Here we report photometric and spectroscopic observations of candidates for the optical counterpart to the system and identify a B5III or B6V star as a possible companion to the neutron star. We measure the observational parameters of ...
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...
Introduction: The Monte Carlo simulation is used to enhance reliability in the experiments related to nuclear instruments. in addition, that is used to calculate the different components of the neutron and gamma ray fluxes in boron neutron capture therapy(BNCT) and neutron capture (NCT)applications. BNCT is one of the methods in radiotherapy, that is used the neutron beam for ki...
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