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Featured researches published by R. C. Jopson.


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)


Review of Scientific Instruments | 1960

THIN FIBER SCINTILLATION COUNTER FOR DETERMINING PARTICLE BEAM DISTRIBUTIONS IN ACCELERATORS

R. C. Jopson; R. E. Wright; Hans Mark

Thin fiber scintillation counters for studying particle beams in accelerators were developed using small plastic scintillation fibers made for use in high-energy physics. A fiber of 0.5-mm diameter or less and 1 to 10 cm long is mounted on a long thin (0.5-mm diameter and 20 ft long) two-layer glass pipe; the pipe serves as a light transmitter. The pipe passes through a vacuum seal and is joined to the face of a photomultiplier. Since the pipe is susceptible to radiation damage. it is placed inside a steel tube filled with Woods metal. Using this counter, electrons were shown to be trapped in the Astron E-layer tank for times longer than 1 sec, and estimates of the number of the initially trapped particles were made. (D.L.C.)


Reviews of Modern Physics | 1966

ATOMIC FLUORESCENCE YIELDS

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


Physical Review | 1958

PRECISION DETERMINATION OF NUCLEAR ENERGY LEVELS IN HEAVY ELEMENTS

E. L. Chupp; Jesse W. M. DuMond; F. J. Gordon; R. C. Jopson; Hans Mark


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


Physical Review | 1962

PRODUCTION OF CHARACTERISTIC X RAYS BY LOW-ENERGY PROTONS

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


Physical Review | 1958

Precision determination of gamma rays following (p, p′γ) and (p, nγ) Reactions

E. L. Chupp; Jesse W. M. DuMond; F. J. Gordon; R. C. Jopson; Hans Mark


Physical Review | 1961

L TO K RATIOS IN THE ELECTRON CAPTURE DECAY OF W

R. C. Jopson; Hans Mark; C. D. Swift; J.H. Zenger


Physical Review | 1961

sup 181

R. C. Jopson; Hans Mark; C. D. Swift; J.H. Zenger


Physical Review | 1963

AND Ta

R. C. Jopson; Hans Mark; C. D. Swift; M. A. Williamson

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Hans Mark

Massachusetts Institute of Technology

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C. D. Swift

Lawrence Livermore National Laboratory

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E. L. Chupp

Lawrence Livermore National Laboratory

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F. J. Gordon

Lawrence Livermore National Laboratory

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M. A. Williamson

Lawrence Livermore National Laboratory

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Jesse W. M. DuMond

California Institute of Technology

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G. Chodil

Lawrence Livermore National Laboratory

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J.H. Zenger

Lawrence Livermore National Laboratory

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L. F. Hansen

Lawrence Livermore National Laboratory

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David Hearn

Lawrence Livermore National Laboratory

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