Level Densities of 74,76Ge from compound nuclear reactions
Abstract
The level densities of 74,76Ge nuclei are studied with 68,70Zn(7Li , Xp ) reactions. Proton evaporation spectra are measured at backward angles in a wide energy region, from about 2 to 25 MeV. The analysis of spectra allows for the testing of level density models used in modern reaction codes for practical cross-section calculations. Our results show that at excitation energies above the discrete level region, all level density models tested in this work overestimate the level densities that are needed to reproduce proton spectra from these reactions. The Gilbert and Cameron model, which includes the constant-temperature energy dependence of the level density, shows the best agreement with experiment, however, its parameters need to be adjusted to reflect the observed reduction of the level density at higher excitation energies.
- Authors:
-
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- Ohio Univ., Athens, OH (United States). Dept. of Physics
- Univ. of Oslo, Olso (Norway). Dept. of Physics
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Michigan State Univ., East Lansing, MI (United States). Dept. of Chemistry; Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab; Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab; Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy
- Ohio Univ., Athens, OH (United States). Dept. of Physics; King Saud Univ., Riyadh (Saudi Arabia). Physics and Astronomy Dept.
- Ohio Univ., Athens, OH (United States). Dept. of Physics; Barry Univ., Miami Shores, FL (United States). Dept. of Physical Sciences
- Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics
- Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics; Darmstadt Univ. of Technology, Darmstadt (Germany). Inst. of Nuclear Physics
- Ohio Univ., Athens, OH (United States). Dept. of Physics; Texas A&M Univ., College Station, TX (United States). Cyclotron Inst.
- Ohio Univ., Athens, OH (United States). Dept. of Physics. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Ohio Univ., Athens, OH (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1561455
- Alternate Identifier(s):
- OSTI ID: 1511508; OSTI ID: 1834621
- Report Number(s):
- LLNL-JRNL-766439
Journal ID: ISSN 2469-9993; 951464; TRN: US2000616
- Grant/Contract Number:
- AC52-07NA27344; NA0002905; SC0019042; FG02-88ER40387; NA-0003221; NA-0003180; NA0003909
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 5; Journal ID: ISSN 2469-9993
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Compound reactions, level density
Citation Formats
Voinov, A. V., Renstrom, T., Bleuel, D. L., Grimes, S. M., Guttormsen, M., Larsen, A. C., Liddick, S. N., Perdikakis, G., Spyrou, A, Akhtar, S., Alanazi, N., Brandenburg, K., Brune, C. R., Danley, T. W., Dhakal, S., Gastis, P, Giri, R., Massey, T. N., Meisel, Z., Nikas, S, Paneru, S. N., Parker, C. E., and Richard, A. L. Level Densities of 74,76Ge from compound nuclear reactions. United States: N. p., 2019.
Web. doi:10.1103/PhysRevC.99.054609.
Voinov, A. V., Renstrom, T., Bleuel, D. L., Grimes, S. M., Guttormsen, M., Larsen, A. C., Liddick, S. N., Perdikakis, G., Spyrou, A, Akhtar, S., Alanazi, N., Brandenburg, K., Brune, C. R., Danley, T. W., Dhakal, S., Gastis, P, Giri, R., Massey, T. N., Meisel, Z., Nikas, S, Paneru, S. N., Parker, C. E., & Richard, A. L. Level Densities of 74,76Ge from compound nuclear reactions. United States. https://doi.org/10.1103/PhysRevC.99.054609
Voinov, A. V., Renstrom, T., Bleuel, D. L., Grimes, S. M., Guttormsen, M., Larsen, A. C., Liddick, S. N., Perdikakis, G., Spyrou, A, Akhtar, S., Alanazi, N., Brandenburg, K., Brune, C. R., Danley, T. W., Dhakal, S., Gastis, P, Giri, R., Massey, T. N., Meisel, Z., Nikas, S, Paneru, S. N., Parker, C. E., and Richard, A. L. Wed .
"Level Densities of 74,76Ge from compound nuclear reactions". United States. https://doi.org/10.1103/PhysRevC.99.054609. https://www.osti.gov/servlets/purl/1561455.
@article{osti_1561455,
title = {Level Densities of 74,76Ge from compound nuclear reactions},
author = {Voinov, A. V. and Renstrom, T. and Bleuel, D. L. and Grimes, S. M. and Guttormsen, M. and Larsen, A. C. and Liddick, S. N. and Perdikakis, G. and Spyrou, A and Akhtar, S. and Alanazi, N. and Brandenburg, K. and Brune, C. R. and Danley, T. W. and Dhakal, S. and Gastis, P and Giri, R. and Massey, T. N. and Meisel, Z. and Nikas, S and Paneru, S. N. and Parker, C. E. and Richard, A. L.},
abstractNote = {The level densities of 74,76Ge nuclei are studied with 68,70Zn(7Li , Xp ) reactions. Proton evaporation spectra are measured at backward angles in a wide energy region, from about 2 to 25 MeV. The analysis of spectra allows for the testing of level density models used in modern reaction codes for practical cross-section calculations. Our results show that at excitation energies above the discrete level region, all level density models tested in this work overestimate the level densities that are needed to reproduce proton spectra from these reactions. The Gilbert and Cameron model, which includes the constant-temperature energy dependence of the level density, shows the best agreement with experiment, however, its parameters need to be adjusted to reflect the observed reduction of the level density at higher excitation energies.},
doi = {10.1103/PhysRevC.99.054609},
journal = {Physical Review C},
number = 5,
volume = 99,
place = {United States},
year = {Wed May 08 00:00:00 EDT 2019},
month = {Wed May 08 00:00:00 EDT 2019}
}
Web of Science
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