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Featured researches published by C. D. Swift.


Nuclear Physics | 1962

Ta181(p, n)W181 and Au197(p, n)Hg197 excitation functions between 4 and 13 MeV

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

SCORPIUS XR-1: SOME X-RAY AND OPTICAL OBSERVATIONS (1969 MAY).

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

OBSERVATION OF SEVERAL X-RAY SOURCES IN 1970 SEPTEMBER.

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

Proportional Counters and Electronic Systems for Observing Cosmic X Rays

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

ATOMIC FLUORESCENCE YIELDS

R.W. Fink; R. C. Jopson; Hans Mark; C. D. Swift


Physical Review Letters | 1967

Spectral and Location Measurements of Several Cosmic X-Ray Sources Including a Variable Source in Centaurus

G. Chodil; Hans Mark; R. Rodrigues; F. D. Seward; C. D. Swift; W. A. Hiltner; George Wallerstein; Edward J. Mannery


The Astrophysical Journal | 1968

SIMULTANEOUS OBSERVATIONS OF THE OPTICAL AND X-RAY SPECTRA OF SCO XR-1.

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

DIFFUSE COSMIC X-RAY BACKGROUND BETWEEN 4 AND 40 keV.

F. D. Seward; G. Chodil; Hans Mark; C. D. Swift; A. Toor


The Astrophysical Journal | 1967

X-Ray Intensities and Spectra from Several Cosmic Sources

G. Chodil; Hans Mark; R. Rodrigues; F. D. Seward; C. D. Swift


Physical Review Letters | 1965

X-ray spectra from scorpius (SCO-XR-1) and the sun observed above the atmosphere

G. Chodil; R. C. Jopson; Hans Mark; F. D. Seward; C. D. Swift

Collaboration


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Hans Mark

Massachusetts Institute of Technology

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R. C. Jopson

Lawrence Livermore National Laboratory

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R. Rodrigues

Lawrence Livermore National Laboratory

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F. D. Seward

Lawrence Livermore National Laboratory

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G. Chodil

Lawrence Livermore National Laboratory

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R.E. Price

Lawrence Livermore National Laboratory

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M. A. Williamson

Lawrence Livermore National Laboratory

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