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Title: 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:
 [1];  [1];  [1];  [2];  [3];  [4];  [5];  [1];  [6];  [4];  [6];  [7];  [3];  [8];  [9];  [5];  [9];  [9];  [10];  [6] more »;  [6];  [7];  [11];  [5];  [6];  [5];  [4];  [3];  [12];  [13];  [3];  [1];  [1];  [6] « less
  1. Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
  2. Daresbury Laboratory, Cheshire (England)
  3. U.S. Naval Academy, Annapolis, MD (United States). Dept. of Physics
  4. Univ. of Liverpool (United Kingdom). Dept. of Physics
  5. Univ. of Notre Dame, IN (United States). Dept. of Physics
  6. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
  7. Army Research Lab., Adelphi, MD (United States)
  8. 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
  9. Univ. of Massachusetts, Lowell, MA (United States). Dept of Physics
  10. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Physics and Astronomy
  11. Mississippi State Univ., Mississippi State, MS (United States)
  12. Univ. of Texas, Arlington, TX (United States). Dept. of Physics
  13. Univ. of the Western Cape, Bellville (South Africa)
Publication Date:
Research Org.:
Argonne National Lab. (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. 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., and Zhu, S. Tue . "Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei". United States. doi:10.1103/PhysRevC.100.014302.
@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 = {2019},
month = {7}
}

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