Signature inversion — A fingerprint of triaxiality

Bengtsson, R.; Frisk, Hans; May, Falk; Pinston, J.A.

doi:10.1016/0375-9474(84)90620-1

Cited by 206 publications

(124 citation statements)

References 20 publications

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“…For instance, in 120 Cs, it is calculated to be more than 0.7 MeV athω = 0.2 MeV. The role of this low-Ω, high-j orbit is to induce a deformation close to axial symmetry with slight tendency towards positive γ value [4]. Otherwise it acts as spectator and the signature splitting is entirely due to the neutrons.…”

Section: The Influence Of the Quadrupole Pairing Force On Signatmentioning

confidence: 99%

“…[5,6,7,4]. The general condition for signature inversion to take place [4] was positive triaxial deformation, γ > 0, within the Lund convention combined with a specific position of the Fermi surface, see also [8,9]. One should point out, however, that (i) the γ-values are almost impossible to measure directly in experiment; (ii) the values of the γ parameter necessary to account for the experimental data are not always supported by potential energy calculations which in many cases predicts almost axial shapes [10].…”

Section: Introductionmentioning

confidence: 99%

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Quadrupole pairing interaction and signature inversion

2000

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The signature inversion in the πh 11/2 νh 11/2 rotational bands of the odd-odd Cs and La isotopes and the πh 11/2 νi 13/2 bands of the odd-odd Tb, Ho and Tm nuclei is investigated using pairing and deformation self-consistent mean-field calculations. The model can rather satisfactorily account for the anomalous signature splitting provided that spin assignments in some of the bands are revised. Our calculations show that signature inversion can appear already at axially symmetric shapes. It is found that this is due to the contribution of the (λµ) = (22) component of the quadrupole-pairing interaction to the mean-field potential.

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Section: The Influence Of the Quadrupole Pairing Force On Signatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quadrupole pairing interaction and signature inversion

2000

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“…It is interesting to see a connection between triaxiality and the signature inversion which has been discussed in Refs. [13,31].…”

Section: It Is Interesting To Find That the γ Values Are 19mentioning

confidence: 99%

High-spin level structure ofRh115: Evolution of triaxiality in odd-even Rh isotopes

et al. 2011

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High-spin excited states in the neutron-rich nucleus 115 Rh have been identified for the first time by studying prompt γ rays from the spontaneous fission of 252 Cf with the Gammasphere detector array. A new yrast band and a side-band are built in 115 Rh. This level scheme is proposed to be built on the 7/2 + ground state. The existence of a large signature splitting and an yrare band in 115 Rh shows typical features of a triaxially deformed nucleus. The Rigid Triaxial Rotor plus Particle model is used to interpret the level structure of 115 Rh. The level energies, gamma branching ratios, the large signature splitting in the yrast band, and the inverted signature splitting in the yrare band in 115 Rh are reproduced very well. Strong K-mixing occurs in 115 Rh at high spin.

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“…Low-spin signature inversion has been observed in the yrast bands of some odd-odd A ≈ 160 nuclides [4][5][6][7][8] and band (2) in 166 Re [9]. The signature-inversion effect, implying that the normally energetically favored signature becomes unfavored, has been addressed by using different theoretical approaches [10][11][12] but still has no consistent theoretical explanation.…”

Section: Introductionmentioning

confidence: 99%

Lifetime measurements inRe166: Collective versus magnetic rotation

Li¹,

Cederwall²,

Doncel³

et al. 2016

Phys. Rev. C

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Lifetimes of excited states in the neutron-deficient odd-odd nucleus 166 Re have been measured for the first time using the recoil distance Doppler-shift method. The measured lifetime for the (8 − ) state; τ = 480 (80) ps, enabled an assessment of the multipolarities of the γ rays depopulating this state. Information on electromagnetic transition strengths were deduced for the γ -ray transitions from the (9 − ), (10 − ), and (11 − ) states, and in the case of the (10 − ) and (11 − ) states limits on the B(M1) and B(E2) strengths were estimated. The results are compared with total Routhian surface predictions and semiclassical calculations. Tilted-axis cranking calculations based on a relativistic mean-field approach (TAC-RMF) have also been performed in order to test the possibility of magnetic rotation in the 166 Re nucleus. While the TAC-RMF calculations predict a quadrupole-deformed nuclear shape with similar β 2 deformation as obtained by using the TRS model, it was found that the experimental electromagnetic transition rates are in better agreement with a collective-rotational description.

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Signature inversion — A fingerprint of triaxiality

Cited by 206 publications

References 20 publications

Quadrupole pairing interaction and signature inversion

Quadrupole pairing interaction and signature inversion

High-spin level structure ofRh115: Evolution of triaxiality in odd-even Rh isotopes

Lifetime measurements inRe166: Collective versus magnetic rotation

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