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Your search keyword '"Livesay, R. J."' showing total 7 results
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7 results on '"Livesay, R. J."'

1. $s$-wave scattering lengths for the $^7$Be+p system from an $\textit{R}$-matrix analysis

Author

Paneru, S. N., Brune, C. R., Giri, R., Livesay, R. J., Greife, U., Blackmon, J. C., Bardayan, D. W., Chipps, K. A., Davids, B., Connolly, D. S., Chae, K. Y., Champagne, A. E., Deibel, C., Jones, K. L., Johnson, M. S., Kozub, R. L., Ma, Z., Nesaraja, C. D., Pain, S. D., Sarazin, F., Shriner Jr., J. F., Stracener, D. W., Smith, M. S., Thomas, J. S., Visser, D. W., and Wrede, C.

Subjects
Nuclear Theory (nucl-th), Astrophysics - Solar and Stellar Astrophysics, Nuclear Theory, Physics::Accelerator Physics, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

The astrophysical $S$-factor for the radiative proton capture reaction on $^7$Be ($S_{17}$) at low energies is affected by the $s$-wave scattering lengths. We report the measurement of elastic and inelastic scattering cross sections for the $^7$Be+p system in the center-of-mass energy range 0.474 - 2.740 MeV and center-of-mass angular range of 70$^\circ$- 150$^\circ$. A radioactive $^7$Be beam produced at Oak Ridge National Laboratory's (ORNL) Holifield Radioactive Ion Beam Facility was accelerated and bombarded a thin polypropylene (CH$_{2}$)$_\text n$ target. Scattered ions were detected in the segmented Silicon Detector Array. Using an $\textit{R}$-matrix analysis of ORNL and Louvain-la-Neuve cross section data, the $s$-wave scattering lengths for channel spins 1 and 2 were determined to be 17.34$^{+1.11}_{-1.33}$ and -3.18$^{+0.55}_{-0.50}$ fm, respectively. The uncertainty in the $s$-wave scattering lengths reported in this work is smaller by a factor of 5-8 compared to the previous measurement, which may reduce the overall uncertainty in $S_{17}$ at zero energy. The level structure of $^8$B is discussed based upon the results from this work. Evidence for the existence of 0$^+$ and 2$^+$ levels in $^8$B at 1.9 and 2.21 MeV, respectively, is observed.

Published
2019
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2. The 25Al(p,γ)26Si reaction rate in novae

Author

Bardayan, D. W., Blackmon, J. C., William Hix, Liang, J. F., Smith, M. S., Howard, J. A., Kozub, R. L., Brune, C. R., Chae, K. Y., Lingerfelt, E. J., Scott, J. P., Johnson, M. S., Jones, K. L., Pain, S. D., Thomas, J. S., Livesay, R. J., and Visser, D. W.

3. Searching for Resonances in the Unbound Nucleus (6)Be

Author

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

4. Astrophysically important 19Ne states studied with the 2H(18F, α+15 O)n reaction

Author

Adekola, A. S., Bardayan, D. W., Blackmon, J. C., Brune, C. R., Chae, K. Y., Champagne, A. E., Domizioli, C. P., Greife, U., Heinen, Z., Hornish, M. J., Johnson, M., Jones, K. L., Kozub, R. L., Livesay, R. J., Ma, Z., Massey, T. N., Moazen, B., Caroline Nesaraja, Pain, S. D., Shriner Jr, J. F., Thomas, J. S., Smith, N. D., Smith, M. S., Visser, D. W., and Voinov, A. V.

Abstract

The nuclear structure of 19Ne near the proton threshold is of interest for understanding the rates of proton-induced reactions on 18F in novae. Analogues for several states in the mirror nucleus 19F have not yet been identified in 19Ne indicating the level structure of 19Ne in this region is incomplete. The 18F(d,n)19Ne and 18F(d, p)19F reactions have been measured simultaneously at Ec.m. = 14.9 MeV. The experiments were performed at the Holifield Radioactive Ion Beam Facility (HRIBF) of Oak Ridge National Laboratory (ORNL) by bombarding a 720-μg/cm2 CD2 target with a radioactive 18F beam. The 19Ne states of interest near the proton threshold decay by breakup into a and 15O particles. These decay products were detected in coincidence with position-sensitive E-ΔE silicon telescopes. The α and 15N particles from the break up of the mirror nucleus 19F were also measured with these detectors. Particle identification, coincidence, and Q-value requirements enable us to distinguish the reaction of interest from other reactions. The reconstruction of relative energy of the detected particles reveals the excited states of 19Ne and 19F which are populated. The neutron (proton) angular distributions for states in 19Ne (19F) were extracted using momentum conservation. The observed states in 19Ne and 19F will be presented.

5. Astrophysically important 19Ne states studied with the 2H(18F, α+15 O)n reaction

Author

Adekola, A. S., Bardayan, D. W., Blackmon, J. C., Brune, C. R., Chae, K. Y., Champagne, A. E., Domizioli, C. P., Greife, U., Heinen, Z., Hornish, M. J., Johnson, M., Jones, K. L., Kozub, R. L., Livesay, R. J., Ma, Z., Massey, T. N., Moazen, B., Nesaraja, C. D., Pain, S. D., Shriner Jr, J. F., Thomas Massey, Smith, N. D., Smith, M. S., Visser, D. W., and Voinov, A. V.

6. Study of interference effects in the18F(p, α)15O reaction

Author

Chae, K. Y., Guidry, M. W., Nesaraja, C. D., Ma, Z., Bardayan, D. W., Blackmon, J. C., Smith, M. S., Gregory, D., Kozub, R. L., Stanley Paulauskas, Shriner Jr, J. F., Smith, N., Johnson, M. S., Livesay, R. J., Porter-Peden, M., Pain, S. D., and Thomas, J. S.

7. Single neutron transfer experiments close to the r-process path

Author

Jones, K. L., Adekola, A. S., Bardayan, D. W., Blackmon, J. C., Chae, K. Y., Chipes, K., Cizewski, J. A., Dean, D. J., Erikson, L., Fltzgerald, R. P., Gaddis, A. L., Greife, U., Harlin, C., Hatarik, R., Howard, J. A., Micah Johnson, Kozub, R. L., Liang, J. F., Livesay, R. J., Ma, Z., Moazen, B. H., O Malley, P. D., Nesaraja, C. D., Pain, S. D., Patterson, N. P., Paulauskas, S. V., Shapira, D., Shriner Jr, J. F., Sissom, D. J., Smith, M. S., Swan, T. P., and Thomas, J. S.

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