Warren L. Bendel
United States Naval Research Laboratory
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IEEE Transactions on Nuclear Science | 1983
Warren L. Bendel; Edward Petersen
This paper presents a method of predicting proton-induced single event upset rates in spacecraft RAMs. The approach uses a sensitivity parameter A, determined from one or more experimental measurements of upset cross sections made at any proton energy above threshold. Parameter A uniquely determines a curve for the energy dependence of the upset cross section. This curve can be combined with the proton spectrum at the RAM to predict its upset rate. Predicted upset rates for 600 circular orbits are presented.
Nuclear Instruments and Methods | 1970
L.W. Fagg; E.C. Jones; Warren L. Bendel
Abstract A gas target system for use with 180° electron scattering experiments is described. The target gas is cooled to 77°K and maintained at about 4.4 atm with 6 μm havar foils separating the gas from the vacuum of the main target chamber. A gas transfer feature using liquid helium trapping is employed. The successful use of this apparatus in experiments with 20Ne, 3He, and 4He is discussed. Salient features of an improved gas target design, now being tested, are also given.
Physics Letters B | 1973
L.W. Fagg; Warren L. Bendel; N. Ensslin; E.C. Jones
Abstract The 6Li analog of the 11.5 MeV, 0+ state in 6Be proposed to explain the low flux of high-energy solar neutrinos has been searched for and not observed. An upper limit of 3 eV is placed on the M1 ground-state width of any such narrow 0+ state.
IEEE Transactions on Nuclear Science | 1977
Warren L. Bendel
Neutrons produce damage in materials by means of recoil ions and charged secondary particles. The kerma deposited in five materials has been separated into displacement and ionization parts using Lindhards work. The calculations require data on individual reactions, including angular distributions. Tables and graphs are presented for ~ 1 keV to 18 MeV neutrons on Si, CaF2, 6LiF, 7LiF, and natural LiF. The integrated response is given for a fission spectrum and for two fast reactor spectra.
Physical Review C | 1979
E.C. Jones; Warren L. Bendel; L.W. Fagg; R. Lindgren
Elastic and inelastic cross sections for 180/sup 0/ electron scattering from /sup 3/He were measured at incident electron energies of 40.44, 50.58, and 60.63 MeV. Our radiatively corrected cross section measurements are in good agreement with theoretical calculations of the behavior near the two-body breakup threshold at 5.5 MeV. The measurements were also compared to cross sections calculated in the zero-range approximation and to sum rules. At q = 0.602 fm/sup -1/ the measured magnetic radius was r = 1.79 + 0.14 fm. The possibility of the existence of a state at about 10 MeV excitation is also discussed.
Physical Review C | 1977
L.W. Fagg; Warren L. Bendel; R. Lindgren; E.C. Jones
A survey of electromagnetic transitions excited in /sup 27/Al by 180/sup 0/ inelastic electron scattering has been made at incident energies of 37, 51, and 61 MeV. Transitions to levels at 2.23, 2.98, 4.42, 8.74, and 11.69 MeV are dominantly M1 with some possible E2 contributions. Tentative M1 assignments are given transitions at 7.57 and 8.05 MeV, but the possibility of their being E1 cannot be excluded. Transitions to levels at 10.68 and 12.30 MeV are probably M1 but with considerable E2 admixture. A transition at 6.50 MeV is also probably M1, but both E1 and E2 are possible alternative assignments. Model-dependent radiative widths GAMMA/sub 0/(M1) for the M1 transitions are given based on an analysis of the data using simple but representative harmonic-oscillator wave functions to calculate cross sections.
Physical Review C | 1977
L.W. Fagg; Warren L. Bendel; R. R. Lindgren; E.C. Jones
A survey of electromagnetic transitions excited in /sup 27/Al by 180/sup 0/ inelastic electron scattering has been made at incident energies of 37, 51, and 61 MeV. Transitions to levels at 2.23, 2.98, 4.42, 8.74, and 11.69 MeV are dominantly M1 with some possible E2 contributions. Tentative M1 assignments are given transitions at 7.57 and 8.05 MeV, but the possibility of their being E1 cannot be excluded. Transitions to levels at 10.68 and 12.30 MeV are probably M1 but with considerable E2 admixture. A transition at 6.50 MeV is also probably M1, but both E1 and E2 are possible alternative assignments. Model-dependent radiative widths GAMMA/sub 0/(M1) for the M1 transitions are given based on an analysis of the data using simple but representative harmonic-oscillator wave functions to calculate cross sections.
Archive | 1970
B. T. Chertok; E. C. Jones; Warren L. Bendel; L. W. Fagg; H. F. Kaiser; Susan Numrich
The photomagnetic dipole disintegrations of the trinucleon doublets, 3H and 3He, are forbidden processes which, accordingly, are difficult to observe in competition with the El disintegration produced by photons. The extent of this orthogonality is evident by comparing the radiative capture cross sections of the proton and of the deuteron by thermal neutrons. The measured values are 0.5 mb for 2H(n,γ)3H and 334 mb for 1H(n,γ)2H where the latter is a M1 allowed radiative transition. It is by now widely appreciated that inelastic electron scattering at 180° is an experimental tool to sizably enhance Ml in competition with El processes.1 This is because the longitudinal part of the virtual photon spectrum vanishes as θ → π, while the transverse part of the equivalent spectrum is dominated at 180° by M1 compared to El as q2/k2 where \(\vec{q}={{\vec{p}}_{o}}-\vec{p}\) and k = ∆E/ℏc. Furthermore the photomagnetic orthogonality in 3He may be broken by inelastic electron scattering.2
Physical Review | 1969
L.W. Fagg; Warren L. Bendel; E. C. Jones; Susan Numrich
Physical Review | 1958
Warren L. Bendel; John McElhinney; Ralph A. Tobin
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