Evidence for Decreased Pairing Energies in Odd-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi></mml:math>Nuclei from Band-Crossing Frequencies

Garrett, J.D.; Andersen, Ole; Gaardhøje, J. J.; Hagemann, G.B.; Herskind, B.; Kownacki, J.; Lisle, J.C.; Riedinger, L. L.; Waluś, W.; N, Roy; Jónsson, S.; Ryde, H.; Guttormsen, M.; Tjøm, P.O.

doi:10.1103/physrevlett.47.75

Cited by 76 publications

(9 citation statements)

References 20 publications

(2 reference statements)

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“…The band crossing frequency is about 40 keV lower than that of the yrast band in the neighboring even-even nucleus 162 Er [37]. This phenomenon was observed in a number of odd-A nuclei in the rare-earth region, and it could be explained by a reduction of neutron pairing correlation [38]. One interesting feature here is that the alignment curves for the two signature branches cross at ω ≈ 0.24 MeV as shown in Fig.…”

Section: A Alignment Propertiesmentioning

confidence: 88%

Properties of the rotational bands inEr161

et al. 2011

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High-spin states in 161 Er have been studied experimentally using the 150 Nd( 16 O,5n) reaction at a beam energy of 86 MeV. The 5/2 + [642], 3/2 − [521], and 11/2 − [505] bands are extended up to high-spin states, and particularly the α = −1/2 branch of the ground state 3/2 − [521] band is revised significantly. The relatively enhanced E1 transitions from the 3/2 − [521] band to the 5/2 + [642] band are observed. The band properties are analyzed within the framework of a triaxial particle-rotor model, and near-prolate shape and triaxial deformation are proposed to the 3/2 − [521] and 5/2 + [642] bands, respectively. Signature inversion occurs in the 3/2 − [521] band after the band crossing in 161 Er, and the systematics of the signature inversion associated with the 3/2 − [521] configuration are discussed. By analyzing the properties of the relatively enhanced E1 transitions, it is found that the R(E1/E2) values show angular momentum dependence before the band crossing, and these enhanced E1 transitions could be attributed to octupole softness.

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Section: A Alignment Propertiesmentioning

confidence: 88%

Properties of the rotational bands inEr161

et al. 2011

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“…Configuration dependent pairing [18] and interactions between quasiparticles [19] not included in the simple version of the cranked shell model were found in Er, Yb, Hf, and W isotopes. Recently Herskind [20] outlined a new way to estimate these effects from crossing frequencies.…”

Section: Residual Interactionsmentioning

confidence: 97%

Rotation aligned bands and configuration dependent interaction in189Hg

et al. 1983

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High spin states in lSgHg have been studied using the lSlTa(Z4N, 6n) reaction. The various one-and three-quasiparticle rotational bands were interpreted within the cranked shell model. The band-crossing frequencies are found to depend on the number of spectator particles. The effect can be accounted for by a residual two-body interaction of appr. -0.11 MeV.Nuclear Reaction: lSlTa(14N, 6n), E=100MeV; measured E~, Iv, 7~)-coin, 7(0), ce-ce--coin, lS9Hg deduced levels, J, re. Ge(Li), NaI, Si(Li) detectors.

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“…This article builds upon the classic work of Garrett et al [22] who systematically investigated band-crossing frequencieshω c , associated with the alignment of the first pair of i 13/2 neutrons; (AB) in the nomenclature of Riedinger et al [23]. The band-crossing frequencyhω c corresponds to the point where the Routhians (energy in the rotating frame) of two different quasiparticle configurations cross one another, changing the energetically preferred configuration [18].…”

Section: Data Analysis and Resultsmentioning

confidence: 94%

“…[23], a listing of the quasiparticle assignments to specific neutron orbitals close to the Fermi surface for rare-earth nuclei is given. Garrett et al [22] found evidence was for an odd-even neutron-number dependence,hω c (odd N) <hω c (even N), which was attributed to changes in the strength of neutron pairing correlations. The present paper carries out a similar comprehensive investigation for the second pair of aligning i 13/2 neutrons (BC) occurring at higher rotational frequencies.…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

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

Miller¹,

Villafana²,

Riley³

et al. 2019

Phys. Rev. C

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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 components of the neutron i 13/2 shell.

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Evidence for Decreased Pairing Energies in Odd-NNuclei from Band-Crossing Frequencies

Cited by 76 publications

References 20 publications

Properties of the rotational bands inEr161

Properties of the rotational bands inEr161

Rotation aligned bands and configuration dependent interaction in189Hg

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

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