Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei
Abstract
Garrett et al. systematically investigated band-crossing frequencies resulting from the rotational alignment of the first pair of $$i_{13/2}$$ neutrons (AB) in rare-earth nuclei. In that study, evidence was found for an odd-even neutron number dependence attributed to changes in the strength of neutron pairing correlations. The present paper carries out a similar investigation at higher rotational frequencies for the second pair of aligning $$i_{13/2}$$ neutrons (BC). Again, a systematic difference in band-crossing frequencies is observed between odd-$$N$$ and even-$$N$$ Er, Yb, Hf, and W nuclei, but in the BC case, it is opposite to the AB neutron-number dependence. These results are discussed in terms of a reduction of neutron pairing correlations at high rotational frequencies and of the effects of Pauli blocking on the pairing field by higher-seniority configurations. Also playing a significant role are the changes in deformation with proton and neutron numbers, the changes in location of single-particle orbitals as a function of quadrupole deformation, and the position of the Fermi surface with regard to the various Ω components of the neutron $$i_{13/2}$$ shell.
- Authors:
-
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- Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
- Daresbury Laboratory, Cheshire (England)
- U.S. Naval Academy, Annapolis, MD (United States). Dept. of Physics
- Univ. of Liverpool (United Kingdom). Dept. of Physics
- Univ. of Notre Dame, IN (United States). Dept. of Physics
- Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
- Army Research Lab., Adelphi, MD (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Div.; Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States). Dept. of Chemistry and Biochemistry
- Univ. of Massachusetts, Lowell, MA (United States). Dept of Physics
- Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Physics and Astronomy
- Mississippi State Univ., Mississippi State, MS (United States)
- Univ. of Texas, Arlington, TX (United States). Dept. of Physics
- Univ. of the Western Cape, Bellville (South Africa)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science - Office of Nuclear Physics; National Science Foundation (NSF); United Kingdom Science and Technology Facilities Council, Swindon (England); USDOE
- OSTI Identifier:
- 1559885
- Alternate Identifier(s):
- OSTI ID: 1546462
- Grant/Contract Number:
- AC02-06CH11357; FG02-97ER41041; FG02-97ER41033; FG02-96ER40983; FG02-94ER40834; FG02-94ER40848; SC0009883
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 1; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
Miller, S. L., Villafana, K. A., Riley, M. A., Simpson, J., Hartley, D. J., Paul, E. S., Ayangeakaa, A. D., Baron, J. S., Bertone, P. F., Boston, A. J., Carpenter, M. P., Carroll, J. J., Cavey, J., Chiara, C. J., Chowdhury, P., Garg, U., Hota, S. S., Jackson, E. G., Janssens, R. V. F., Kondev, F. G., Lauritsen, T., Litz, M., Ma, W. C., Matta, J., McCutchan, E. A., Mukhopadhyay, S., Nolan, P. J., Pedicini, E. E., Riedinger, L. L., Sharpey-Schafer, J. F., Vanhoy, J. R., Volya, A., Wang, X., and Zhu, S. Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei. United States: N. p., 2019.
Web. doi:10.1103/PhysRevC.100.014302.
Miller, S. L., Villafana, K. A., Riley, M. A., Simpson, J., Hartley, D. J., Paul, E. S., Ayangeakaa, A. D., Baron, J. S., Bertone, P. F., Boston, A. J., Carpenter, M. P., Carroll, J. J., Cavey, J., Chiara, C. J., Chowdhury, P., Garg, U., Hota, S. S., Jackson, E. G., Janssens, R. V. F., Kondev, F. G., Lauritsen, T., Litz, M., Ma, W. C., Matta, J., McCutchan, E. A., Mukhopadhyay, S., Nolan, P. J., Pedicini, E. E., Riedinger, L. L., Sharpey-Schafer, J. F., Vanhoy, J. R., Volya, A., Wang, X., & Zhu, S. Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei. United States. https://doi.org/10.1103/PhysRevC.100.014302
Miller, S. L., Villafana, K. A., Riley, M. A., Simpson, J., Hartley, D. J., Paul, E. S., Ayangeakaa, A. D., Baron, J. S., Bertone, P. F., Boston, A. J., Carpenter, M. P., Carroll, J. J., Cavey, J., Chiara, C. J., Chowdhury, P., Garg, U., Hota, S. S., Jackson, E. G., Janssens, R. V. F., Kondev, F. G., Lauritsen, T., Litz, M., Ma, W. C., Matta, J., McCutchan, E. A., Mukhopadhyay, S., Nolan, P. J., Pedicini, E. E., Riedinger, L. L., Sharpey-Schafer, J. F., Vanhoy, J. R., Volya, A., Wang, X., and Zhu, S. Tue .
"Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei". United States. https://doi.org/10.1103/PhysRevC.100.014302. https://www.osti.gov/servlets/purl/1559885.
@article{osti_1559885,
title = {Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei},
author = {Miller, S. L. and Villafana, K. A. and Riley, M. A. and Simpson, J. and Hartley, D. J. and Paul, E. S. and Ayangeakaa, A. D. and Baron, J. S. and Bertone, P. F. and Boston, A. J. and Carpenter, M. P. and Carroll, J. J. and Cavey, J. and Chiara, C. J. and Chowdhury, P. and Garg, U. and Hota, S. S. and Jackson, E. G. and Janssens, R. V. F. and Kondev, F. G. and Lauritsen, T. and Litz, M. and Ma, W. C. and Matta, J. and McCutchan, E. A. and Mukhopadhyay, S. and Nolan, P. J. and Pedicini, E. E. and Riedinger, L. L. and Sharpey-Schafer, J. F. and Vanhoy, J. R. and Volya, A. and Wang, X. and Zhu, S.},
abstractNote = {Garrett et al. systematically investigated band-crossing frequencies resulting from the rotational alignment of the first pair of $i_{13/2}$ neutrons (AB) in rare-earth nuclei. In that study, evidence was found for an odd-even neutron number dependence attributed to changes in the strength of neutron pairing correlations. The present paper carries out a similar investigation at higher rotational frequencies for the second pair of aligning $i_{13/2}$ neutrons (BC). Again, a systematic difference in band-crossing frequencies is observed between odd-$N$ and even-$N$ Er, Yb, Hf, and W nuclei, but in the BC case, it is opposite to the AB neutron-number dependence. These results are discussed in terms of a reduction of neutron pairing correlations at high rotational frequencies and of the effects of Pauli blocking on the pairing field by higher-seniority configurations. Also playing a significant role are the changes in deformation with proton and neutron numbers, the changes in location of single-particle orbitals as a function of quadrupole deformation, and the position of the Fermi surface with regard to the various Ω components of the neutron $i_{13/2}$ shell.},
doi = {10.1103/PhysRevC.100.014302},
journal = {Physical Review C},
number = 1,
volume = 100,
place = {United States},
year = {Tue Jul 02 00:00:00 EDT 2019},
month = {Tue Jul 02 00:00:00 EDT 2019}
}
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Figures / Tables:
FIG. 1: Ratio of the excitation energies of the lowest 4+ to 2+ level in even-even nuclei as a function of mass A, which covers the evolution of collectivity in the rare-earth region. This work discusses trends at high spin in Er, Yb, Hf, and W nuclei with 88 ≤more »
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