Chiral Doublet Structures in Odd-Odd<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">N</mml:mi><mml:mspace /><mml:mo>=</mml:mo><mml:mspace /><mml:mn>75</mml:mn><mml:mn /></mml:math>Isotones: Chiral Vibrations

Starosta, K.; Koike, T.; Chiara, C. J.; Fossan, D. B.; LaFosse, D. R.; Hecht, A. A.; Beausang, C. W.; Caprio, M. A.; Cooper, J. R.; Krücken, R.; Novak, J. R.; Zamfir, N. V.; Zyromski, K. E.; Hartley, D. J.; Balabanski, D. L.; Zhang, Jing Ye; Frauendorf, S.; Dimitrov, V. I.

doi:10.1103/physrevlett.86.971

Cited by 335 publications

(258 citation statements)

References 11 publications

(15 reference statements)

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“…The appearance of the wobbling bands [1,2] and the chiral doublet bands [3,4] has provided unambiguous experimental evidence of triaxiality. The wobbling mode was first proposed by Bohr and Mottelson in the 1970s [1].…”

Section: Introductionmentioning

confidence: 99%

Wobbling motion in Pr135 within a collective Hamiltonian

2016

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The recently reported wobbling bands in 135 Pr are investigated by the collective Hamiltonian, in which the collective parameters, including the collective potential and the mass parameter, are respectively determined from the tilted axis cranking (TAC) model and the harmonic frozen alignment (HFA) formula. It is shown that the experimental energy spectra of both yrast and wobbling bands are well reproduced by the collective Hamiltonian. It is confirmed that the wobbling mode in 135 Pr changes from transverse to longitudinal with the rotational frequency. The mechanism of this transition is revealed by analyzing the effective moments of inertia of the three principal axes, and the corresponding variation trend of the wobbling frequency is determined by the softness and shapes of the collective potential.

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Section: Introductionmentioning

confidence: 99%

Wobbling motion in Pr135 within a collective Hamiltonian

2016

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“…One of the most intriguing phenomena discussed in medium and heavy nuclei is the appearance of the nearly degenerate doublet bands in doubly odd nuclei. Such pairs of bands built on the νh 11/2 ⊗ πh 11/2 configuration have been experimentally found in many doubly odd nuclei in the mass A ∼ 130 region [1][2][3][4][5][6]. Previously these bands were interpreted as a manifestation of the chiral doublet bands [7].…”

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confidence: 99%

A simple model for doublet bands in doubly odd nuclei

Yoshinaga

Higashiyama

2006

Eur. Phys. J. A

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Abstract. Nuclear structure of doublet bands in doubly odd nuclei with mass A ∼ 130 is investigated within the framework of a simple model where the even-even core couples with a neutron and a proton in intruder orbitals through a quadrupole-quadrupole interaction. The model reproduces quite well the energy levels of doublet bands and electromagnetic transitions. The staggering of the ratios B(M 1; I → I − 1)/B(E2; I → I − 2) of the yrast bands turns out to be described by the chopsticks-like motion of two angular momenta of the unpaired neutron and the unpaired proton when they are weakly coupled with the core. One of the most intriguing phenomena discussed in medium and heavy nuclei is the appearance of the nearly degenerate doublet bands in doubly odd nuclei. Such pairs of bands built on the νh 11/2 ⊗ πh 11/2 configuration have been experimentally found in many doubly odd nuclei in the mass A ∼ 130 region [1][2][3][4][5][6]. Previously these bands were interpreted as a manifestation of the chiral doublet bands [7]. However, many of recent experiments and analyses do not support this interpretation [8][9][10][11][12]. Recently, we have proposed a pair truncated shell model (PTSM) where the even-even core made of the collective pairs couples with a neutron and a proton in high-j intruder orbitals [13][14][15]. The PTSM successfully describes the properties of doubly odd nuclei in the mass A ∼ 130 region, i.e., both energy spectra and features of electromagnetic transitions. Now the band structure of the doublet bands is well explained by the chopsticks-like motion of two angular momenta of the odd neutron and the odd proton, weakly coupled with the core. Since the PTSM results are rather complicated to analyze, we need a further simplified model to pinpoint the essential mechanism more closely.In this letter we propose a quadrupole coupling model (QCM) where the even-even collective core couples with a neutron and a proton in the high-j intruder orbitals through a quadrupole-quadrupole interaction, and we apply this model to the doublet bands in the mass A ∼ 130 region. In the region, several valence proton particles and a e-mail: yoshinaga@phy.saitama-u.ac.jp valence neutron holes are coupled to the doubly magic nucleus 132 Sn. In the QCM, the states of doubly odd nuclei (neutron number N and proton number Z) with the νh 11/2 ⊗ πh 11/2 configuration are assumed to be constructed by a neutron hole, a proton particle in the 0h 11/2 intruder orbitals, and a collective core. The core is assumed to be made of N + 1 neutrons and Z − 1 protons. A system of one neutron hole in the orbital j ν and one proton particle in the orbital j π is specified as the state |j ν j π ; L , where L is the angular momentum of the particle-hole state. The collective-core state is denoted as |R , where R indicates the angular momentum of the core state. In the simplest version of the model we assume that the neutron and the proton outside the core couple only with the yrast states of the core. Then, a total wave function of any doubly o...

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“…Chiral bands were suggested to appear in atomic nuclei with triaxial shapes [26]. Examples for such bands were suggested in the mass A ≈ 130 [27] and A ≈ 100 [28] regions. The staggering of the B(M1)/B(E2) ratios was described in the framework of several models [29][30][31] and all of them consider large values of the deformation parameter γ.…”

Section: Electromagnetic Transition Probabilitiesmentioning

confidence: 99%

Triaxial deformation and nuclear shape transition in192Au

Öktem¹,

Balabanski

Akkuš³

et al. 2012

Phys. Rev. C

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Background : Nuclei in A ≈ 190 mass region show gradual shape changes from prolate through non-axial deformed shapes and ultimately towards spherical shapes as the Pb region is approached. Exploring how this shape evolution occurs will help understand the evolution of collectivity in this region. Purpose : The level scheme of the 192 Au nucleus in A ≈ 190 region was studied in order to deduce its deformations. Methods : High-spin states of 192 Au have been populated in the 186 W( 11 B, 5n) reaction at a beam energy of 68 MeV and their γ decay was studied using the YRAST Ball detector array at the WNSL, Yale University. Results : Based on double and triple γ-ray coincidence data the level scheme of 192 Au has been extended up to I π = 32 + at an excitation energy of ∼ 6 MeV. Conclusion : The results are discussed in the framework of pairing and deformation self-consistent Total Routhian Surface (TRS) and Cranked Shell Model (CSM) calculations. The comparison of the experimental observations with the calculations indicates that this nucleus takes non-axial shape similar to other Au nuclei in this region.

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Chiral Doublet Structures in Odd-OddN=75Isotones: Chiral Vibrations

Cited by 335 publications

References 11 publications

Wobbling motion in Pr135 within a collective Hamiltonian

Wobbling motion in Pr135 within a collective Hamiltonian

A simple model for doublet bands in doubly odd nuclei

Triaxial deformation and nuclear shape transition in192Au

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