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Your search keyword '"Livesay, R. J."' showing total 7 results
Start Over Author "Livesay, R. J." Topic radioactive nuclear beams
7 results on '"Livesay, R. J."'

1. Searching for Resonances in the Unbound Nucleus 6Be.

Author

Chae, K. Y., Bardayan, D. W., Blackmon, J. C., Champagne, A. E., Das, J. J., Fitzgerald, R. P., Guimarães, V., Jones, K. L., Johnson, M. S., Kozub, R. L., Livesay, R. J., Ma, Z., Nesaraja, C. D., Pain, S. D., Smith, M. S., Thomas, J. S., and Visser, D. W.

Subjects
RADIOACTIVE nuclear beams, ION bombardment, SILICON diodes, ELECTRONS, ELECTRON beams
Abstract

Knowledge of the 3He(3He,2p)4He reaction is important for understanding stellar burning and solar neutrino production. Previous measurements have found a surprisingly large rise in the cross section at low energies that could be due to a low energy resonance in the 3He+3He (6Be) system or electron screening. In the 6Be nucleus, however, no excited states have been observed above the first 2+ state at Ex = 1.67 MeV up to 23 MeV, even though several are expected. The d(7Be,t)6Be reaction has been studied for the first time to search for resonances in the 6Be nucleus that may affect our understanding of the 3He(3He,2p)4He reaction. A 100-MeV 7Be beam from the Holifield Radioactive Ion Beam Facility (HRIBF) was used to bombard CD2 targets, and tritons were detected by the Silicon Detector Array (SIDAR). It appears that a combination of reaction mechanisms is necessary to explain the observed triton energy spectrum. [ABSTRACT FROM AUTHOR]

Published
2009
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2. DEVELOPMENT OF ORRUBA: A SILICON ARRAY FOR THE MEASUREMENT OF TRANSFER REACTIONS IN INVERSE KINEMATICS.

Author

PAIN, S. D., BARDAYAN, D. W., BLACKMON, J. C., CHAE, K. Y., CHIPPS, K. A., CIZEWSKI, J. A., HATARIK, R., JOHNSON, M. S., JONES, K. L., KAPLER, R., KOZUB, R. L., LIVESAY, R. J., MATEI, C., MOAZEN, B. H., NESARAJA, C. D., O'MALLEY, P., SMITH, M. S., SWAN, T., THOMAS, J. S., and WILSON, G. L.

Subjects
RADIOACTIVE nuclear beams, PARTICLE kinematics, SILICON detectors, EXOTIC nuclei, NUCLEAR structure
Published
2008

3. Studies Of Neutron-Rich Nuclei With (d,p) Reactions In Inverse Kinematics At The HRIBF.

Author

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

Subjects
ISOTONE shift, NUCLEAR spectroscopy, HYPERFINE interactions, RADIOACTIVE nuclear beams, PARTICLES (Nuclear physics), NUCLEAR reactions
Abstract

Two N=51 isotones have been measured using (d,p) reactions in inverse kinematics at the Holifield Radioactive Beam Facility (HRIBF) of Oak Ridge National Laboratory. Additionally, we have performed a test measurement using a stable 124Sn beam in preparation for measurements of the 2H(130,132Sn,p)131,133Sn reactions. Preliminary results for 83Ge and 85Se suggest a 5/2+ ground state and a 1/2+ first excited state for both isotopes, in agreement with systematics for the N=51 isotones. The excitation energy of the first excited state is shown to drop as the proton number is reduced. Proton angular distributions following the 2H(124Sn,p)125Sn reaction show sensitivity to the l-value of the transferred nucleon and spectroscopic factors are in agreement with previous measurements in normal kinematics. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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4. Single-Particle Structure of Neutron-Rich Nuclei.

Author

Cizewski, J. A., Thomas, K. L.Jones J.S., Bardayan, D. W., Blackmon, J. C., Gross, C. J., Liang, J. F., Shapira, D., Smith, M. S., Stracener, D. W., Kozub, R. L., Nesaraja, C. D., Greife, U., Livesay, R. J., and Ma, Z.

Subjects
MATHEMATICS, KINEMATICS, RADIOACTIVE nuclear beams, PHYSICS
Abstract

The d(82Ge,p) reaction has been measured in inverse kinematics at the Holifield Radioactive Ion Beam facility, enabling a study of the evolution of single-particle structure above the N=50 shell gap for neutron-rich nuclei. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2004
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5. THE SINGLE-PARTICLE STRUCTURE OF NEUTRON-RICH NUCLEI OF ASTROPHYSICAL INTEREST AT THE ORNL HRIBF.

Author

BARDAYAN, D. W., BATCHELDER, J. C., BLACKMON, J. C., BRUNE, C. R., CHAMPAGNE, A. E., CIZEWSKI, J. A., DAVINSON, T., GREIFE, U., JAMES, A. N., JOHNSON, M., KOZUB, R. L., LIANG, J. F., LIVESAY, R. J., MA, Z., NESARAJA, C. D., RADFORD, D. C., SHAPIRA, D., SMITH, M. S., THOMAS, J. S., and WOODS, P. J.

Subjects
NEUTRON capture, ASTROPHYSICS, NUCLEAR structure, RADIOACTIVE nuclear beams, ION beams
Published
2003

6. SINGLE NEUTRON TRANSFER EXPERIMENTS CLOSE TO THE r-PROCESS PATH.

Author

Jones, K. L., Adekola, A. S., Bardayand, D. W., Blackmond, J. C., Chae, K. Y., Chipps, K., Cizewski, J. A., Dean, D. J., Erikson, L., Fitzgerald, R. P., Gaddis, A. L., Greife, U., Harlin, C., Hatarik, R., Howard, J. A., Johnson, M. S., Kozub, R. L., Liang, J. F., Livesay, R. J., and Ma, Z.

Subjects
ION bombardment, RADIOACTIVE nuclear beams, PARTICLES (Nuclear physics), COLLISIONS (Nuclear physics), PARTICLE beams
Abstract

The first measurements using the (d, p) transfer reaction to study single-particle states in nuclei on the expected r-process path have been made at the Holifield Radioactive Ion Beam Facility. The shell closure at N = 50 has been crossed using the 82Ge(d, p) and 84Se(d, p) reactions. The properties of the lowest-lying states have been determined. Furthermore, the 132Sn(d, p) reaction has been used for the first time to populate single-particle states in 133Sn. [ABSTRACT FROM AUTHOR]

Published
2007

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

Author

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.

Subjects
KINEMATICS, ION bombardment, ANGULAR momentum (Mechanics), RADIOACTIVE nuclear beams, PROTONS
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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