Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei

S. L. Miller; K. A. Villafana; M. A. Riley; J. Simpson; D. J. Hartley; E. S. Paul; A. D. Ayangeakaa; J. S. Baron; P. F. Bertone; A. J. Boston; M. P. Carpenter; J. J. Carroll; J. Cavey; C. J. Chiara; P. Chowdhury; U. Garg; S. S. Hota; E. G. Jackson; R. V.F. Janssens; F. G. Kondev; T. Lauritsen; M. Litz; W. C. Ma; J. Matta; E. A. McCutchan; S. Mukhopadhyay; P. J. Nolan; E. E. Pedicini; L. L. Riedinger; J. F. Sharpey-Schafer; J. R. Vanhoy; A. Volya; X. Wang; S. Zhu

doi:10.1103/PhysRevC.100.014302

Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei

S. L. Miller, K. A. Villafana, M. A. Riley, J. Simpson, D. J. Hartley, E. S. Paul, A. D. Ayangeakaa, J. S. Baron, P. F. Bertone, A. J. Boston, M. P. Carpenter, J. J. Carroll, J. Cavey, C. J. Chiara, P. Chowdhury, U. Garg, S. S. Hota, E. G. Jackson, R. V.F. Janssens, F. G. KondevT. Lauritsen, M. Litz, W. C. Ma, J. Matta, E. A. McCutchan, S. Mukhopadhyay, P. J. Nolan, E. E. Pedicini, L. L. Riedinger, J. F. Sharpey-Schafer, J. R. Vanhoy, A. Volya, X. Wang, S. Zhu

Radiation Imaging and Advanced Diagnosti

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Abstract

Garrett et al. systematically investigated band-crossing frequencies resulting from the rotational alignment of the first pair of i13/2 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 i13/2 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 i13/2 shell.

Original language	English
Article number	014302
Journal	Physical Review C
Volume	100
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.100.014302
State	Published - Jul 2 2019

Funding

We would like to dedicate this article to the memory of Jerry D. Garrett, who inspired so many of us to venture into the fascinating angular momentum realm of the atomic nucleus. This work has been supported, in part, by the U.S. National Science Foundation under Grants No. PHY-1502092 (FSU), No. PHY-1712953 (FSU), No. PHY-1502092 (USNA), No. PHY-1713857 (ND), the State of Florida, the U.K. Science and Technology Facilities Council, and the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 (ANL), and Grants No. DE-FG02-97ER41041 (UNC), No. FG02-97ER41033 (TUNL), No. DE-FG02-96ER40983 (UT), No. DE-FG02-94ER40834 (UofMD), No. DE-FG02-94ER40848 (UML), and No. DE-SC0009883 (FSU).

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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., ... Zhu, S. (2019). Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei. Physical Review C, 100(1), Article 014302. https://doi.org/10.1103/PhysRevC.100.014302

@article{23ef79c9985e46cfa9d1eb07f8713659,

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 i13/2 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 i13/2 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 i13/2 shell.",

author = "Miller, {S. L.} and Villafana, {K. A.} and Riley, {M. A.} and J. Simpson 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 J. Cavey and Chiara, {C. J.} and P. Chowdhury and U. Garg and Hota, {S. S.} and Jackson, {E. G.} and Janssens, {R. V.F.} and Kondev, {F. G.} and T. Lauritsen and M. Litz and Ma, {W. C.} and J. Matta and McCutchan, {E. A.} and S. Mukhopadhyay and Nolan, {P. J.} and Pedicini, {E. E.} and Riedinger, {L. L.} and Sharpey-Schafer, {J. F.} and Vanhoy, {J. R.} and A. Volya and X. Wang and S. Zhu",

note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society. US UK.",

year = "2019",

month = jul,

day = "2",

doi = "10.1103/PhysRevC.100.014302",

language = "English",

volume = "100",

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issn = "2469-9985",

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Miller, SL, Villafana, KA, Riley, MA, Simpson, J, Hartley, DJ, Paul, ES, Ayangeakaa, AD, Baron, JS, Bertone, PF, Boston, AJ, Carpenter, MP, Carroll, JJ, Cavey, J, Chiara, CJ, Chowdhury, P, Garg, U, Hota, SS, Jackson, EG, Janssens, RVF, Kondev, FG, Lauritsen, T, Litz, M, Ma, WC, Matta, J, McCutchan, EA, Mukhopadhyay, S, Nolan, PJ, Pedicini, EE, Riedinger, LL, Sharpey-Schafer, JF, Vanhoy, JR, Volya, A, Wang, X & Zhu, S 2019, 'Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei', Physical Review C, vol. 100, no. 1, 014302. https://doi.org/10.1103/PhysRevC.100.014302

TY - JOUR

T1 - Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei

AU - Miller, S. L.

AU - Villafana, K. A.

AU - Riley, M. A.

AU - Simpson, J.

AU - Hartley, D. J.

AU - Paul, E. S.

AU - Ayangeakaa, A. D.

AU - Baron, J. S.

AU - Bertone, P. F.

AU - Boston, A. J.

AU - Carpenter, M. P.

AU - Carroll, J. J.

AU - Cavey, J.

AU - Chiara, C. J.

AU - Chowdhury, P.

AU - Garg, U.

AU - Hota, S. S.

AU - Jackson, E. G.

AU - Janssens, R. V.F.

AU - Kondev, F. G.

AU - Lauritsen, T.

AU - Litz, M.

AU - Ma, W. C.

AU - Matta, J.

AU - McCutchan, E. A.

AU - Mukhopadhyay, S.

AU - Nolan, P. J.

AU - Pedicini, E. E.

AU - Riedinger, L. L.

AU - Sharpey-Schafer, J. F.

AU - Vanhoy, J. R.

AU - Volya, A.

AU - Wang, X.

AU - Zhu, S.

PY - 2019/7/2

Y1 - 2019/7/2

N2 - Garrett et al. systematically investigated band-crossing frequencies resulting from the rotational alignment of the first pair of i13/2 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 i13/2 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 i13/2 shell.

AB - Garrett et al. systematically investigated band-crossing frequencies resulting from the rotational alignment of the first pair of i13/2 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 i13/2 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 i13/2 shell.

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U2 - 10.1103/PhysRevC.100.014302

DO - 10.1103/PhysRevC.100.014302

M3 - Article

AN - SCOPUS:85069916409

SN - 2469-9985

VL - 100

JO - Physical Review C

JF - Physical Review C

IS - 1

M1 - 014302

ER -

Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei

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