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Your search keyword '"Livesay, R. J."' showing total 3 results
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3 results on '"Livesay, R. J."'

1. Rain-Induced Increase in Background Radiation Detected by Radiation Portal Monitors.

Author

Livesay, R. J., Hausladen, P. A., Blessinger, C. S., and York, R. L.

Subjects
RADIATION measurement instruments, SENSITIVITY analysis, GAMMA ray spectrometry, DETECTION of radioactive substances, ELECTROMAGNETIC measurements, RADIOACTIVITY measurements
Abstract

A complete understanding of both the steady state and transient natural background in radiation portal monitors (RPMs) is essential to predictable system performance as well as maximization of detection sensitivity. To facilitate this understanding, a test bed (the Portal Monitor Test Bed) for the study of steady state and transient natural background in RPMs has been established at Oak Ridge National Laboratory in support of the mission of the Second Line of Defense Program to detect the illicit movement of nuclear material. In the present work, transient increases in gamma-ray counting rates in RPMs due to rain are investigated. The increase in background activity associated with rain has been well documented in the field of environmental radioactivity and originates from the atmospheric deposition of two radioactive daughters of 222Ra, namely 214Pb and 214Bi. In this work, RPM count rates are directly compared with rainfall rates recorded by a co-located weather station. The data verify that these radionuclides are responsible for the dominant transient natural background fluctuations in RPMs. [ABSTRACT FROM AUTHOR]

Published
2010

2. Single-neutron excitations in neutron-rich N = 51 nuclei.

Author

Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Thomas, J. S., Bardayan, D. W., Blackmon, J. C., Cizewski, J. A., Fitzgerald, R. P., Greife, U., Gross, C. J., Johnson, M. S., Jones, K. L., Kozub, R. L., Liang, J. F., Livesay, R. J., Ma, Z., Moazen, B. H., Nesaraja, C. D., Shapira, D., and Smith, M. S.

Abstract

Single-neutron transfer reactions have been measured on two N = 50 isotones at the Holifield Radioactive Ion Beam Facility (HRIBF). The single-particle-like states of 83Ge and 85Se have been populated using radioactive ion beams of 82Ge and 84Se and the (d, p) reaction in inverse kinematics. The properties of the lowest-lying states —including excitation energies, orbital angular momenta, and spectroscopic factors— have been determined for these N = 51 nuclei. [ABSTRACT FROM AUTHOR]

Published
2005
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3. Developing techniques to study A ∼ 132 nuclei with (d, p) reactions in inverse kinematics.

Author

Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Jones, K. L., Baktash, C., Bardayan, D. W., Blackmon, J. C., Catford, W. N., Cizewski, J. A., Fitzgerald, R. P., Greife, U., Johnson, M. S., Kozub, R. L., Livesay, R. J., Ma, Z., Nesaraja, C. D., Shapira, D., Smith, M. S., Thomas, J. S., and Visser, D.

Abstract

A measurement of the (d; p) reaction in inverse kinematics at energies near the Coulomb barrier using a stable beam of 124Sn has been performed at ORNL's Holifield Radioactive Ion Beam Facility (HRIBF). The sensitivity of proton angular distributions to the transferred angular momentum has been demonstrated. Spectroscopic factors have been extracted for three states and are in agreement with previous measurements made in normal kinematics. [ABSTRACT FROM AUTHOR]

Published
2005
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