C. D. Swift
Lawrence Livermore National Laboratory
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Featured researches published by C. D. Swift.
Nuclear Physics | 1962
L. F. Hansen; R. C. Jopson; Hans Mark; C. D. Swift
Excitation functions for the Ta/sup 181/(p,n)W/sup 181/ and Au/sup 197/ (p,n)Hg/sup 197/ reactions were measured for incident proton energies from 4 to 13 Mev. The stacked foil method was used. The activity of the foils was measured by counting the gamma rays and X-rays emitted when the product nuclei decay by electron capture. Absolute values of the cross sections were measured at several energies for these reactions and were compared with the cross sections for compound nucleus formation given by Shapiro. Threshold energies for the (p,2n) reactions were obtained by comparing the present data with neutron yields obtained from long counter measurements. The (p,2n) thresholds are 7.5 Mev for Ta/sup 181/ and 8.3 Mev for Au/sup 197/. The absolute (p,2n) cross section values were also obtained. The total reaction cross sections above 7 Mev are compared with optical model calculations. Results confirm the assumption of a surface absorption potential. (auth)
The Astrophysical Journal | 1970
G. Burginyon; R. J. Grader; R. W. Hill; R.E. Price; R. Rodrigues; F. D. Seward; C. D. Swift; W. A. Hiltner; Edward J. Mannery
Simultaneous X ray and optical observations of Scorpius XR-1, comparing rocket data from various flights
The Astrophysical Journal | 1972
R.E. Price; F. D. Seward; C. D. Swift
Position and intensity measurements made with proportional counters in the 2 to 12 keV band are described. The instruments were launched from Johnson Atoll, and four scans were carried out during the 525 sec spent above 200 km. In comparing the results with the Uhuru survey, only a few differences are noted. One variable source, 2U 1908+0, was weaker. The case of the Magellanic Cloud sources is discussed.
Review of Scientific Instruments | 1967
G. Chodil; Hans Mark; R. Rodrigues; C. Rowe; C. D. Swift
A low‐energy x‐ray detection system has been developed and used on two sounding rocket flights. Proportional counters, sensitive to x rays with quantum energies between 2 and 30 keV, are used in this system. The signals from these counters are modified so that they can be telemetered with an FM‐FM system in such a way that the pulse amplitude is preserved. Pulse‐height analysis is done at the ground station. With this simple system, it is possible to obtain spectra of cosmic x‐ray sources limited only by the resolution of the detectors.
Reviews of Modern Physics | 1966
R.W. Fink; R. C. Jopson; Hans Mark; C. D. Swift
Physical Review Letters | 1967
G. Chodil; Hans Mark; R. Rodrigues; F. D. Seward; C. D. Swift; W. A. Hiltner; George Wallerstein; Edward J. Mannery
The Astrophysical Journal | 1968
G. Chodil; Hans Mark; R. Rodrigues; F. D. Seward; C. D. Swift; Isaac Turiel; W. A. Hiltner; George Wallerstein; Edward J. Mannery
The Astrophysical Journal | 1967
F. D. Seward; G. Chodil; Hans Mark; C. D. Swift; A. Toor
The Astrophysical Journal | 1967
G. Chodil; Hans Mark; R. Rodrigues; F. D. Seward; C. D. Swift
Physical Review Letters | 1965
G. Chodil; R. C. Jopson; Hans Mark; F. D. Seward; C. D. Swift