An electron beam ion source to be used in atomic physics experiments has been designed, constructed and partially tested. The source utilizes a conventional solenoid and an externally launched electron beam. Ultra-hig...
An electron beam ion source to be used in atomic physics experiments has been designed, constructed and partially tested. The source utilizes a conventional solenoid and an externally launched electron beam. Ultra-high vacuum in the ionization region of the source is provided by a distributed sputter-ion pump. The source is relatively simple in design and easy to operate. Thus far it has been used to produce300 eV/q multiply charged beams of carbon, nitrogen, oxygen, and possibly titanium.
The cement industry in Indonesia, heavily relies on coal, contributing significantly to greenhouse gas (GHG) emissions. Simultaneously, Java Island generates over 23 million tons of municipal solid waste (MSW) annuall...
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The pulse height response of silicon surface barrier detectors was measured for median light and heavy fission fragments at average energies from 7 to 102 MeV. The fragment energies were determined by a time-of-flight...
The pulse height response of silicon surface barrier detectors was measured for median light and heavy fission fragments at average energies from 7 to 102 MeV. The fragment energies were determined by a time-of-flight technique. Comparison of the detectors' response to fission fragments with that to alpha particles yielded Δ, the pulse height defect. The results indicate that an appreciable fraction of Δ is due to recombination losses within the ionization column produced by the fragment. The contribution to Δ from this cause decreases approximately linearly with fragment energy. In the energy realm where nonionizing nuclear collisions occur, Δ decreases sharply at initial energies below 25 MeV. An empirical energy calibration method proposed by Schmitt et al. for fission fragments with undergraded energies gave good agreement with the time-of-flight data in the energy range 25–100 MeV. A further empirical procedure is proposed for energies below 25 MeV.
Theoretical expressions for the angular and spectral distributions of synchrotron radiation involve modified Bessel functions of fractional order and the integral ʃ x ∞ K ν (η) d η . A simple series expressions fo...
Theoretical expressions for the angular and spectral distributions of synchrotron radiation involve modified Bessel functions of fractional order and the integral ʃ x ∞ K ν (η) d η . A simple series expressions for these quantities which can be evaluated numerically with hand-held programmable calculators is presented.
Many experimental programs utilize traversing probes to measure spatial profiles of a variable. These measurements are taken asynchronously because the probe measures one location at a time. During an experiment of th...
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Although silicon carbide is a very good semiconductor material for the fabrication of diode detectors for use as neutron power monitors in nuclear reactors, the electrical properties of the diodes may be altered becau...
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A computer model for calculating the characteristics of a radiation field in a cobalt-60 irradiated volume is presented. γ-Ray transmission by the source material and attenuation in the support structure is taken int...
Exposure buildup factors for point isotropic cobalt-60 sources are calculated by the Monte Carlo method with statistical errors ranging from 1.5 to 7% for 1-5 mean free paths (mfp) thick water and iron single slabs an...
The delayed neutron nuclear data are limited by its short lifetime, limited yield fraction, difficulty to obtain a well-defined sample, an inefficient (uncharacterized) experimental system, and numerical instabilities...
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