Chiral bands in odd-odd nuclei with rigid or soft cores

Droste, Ch.; Rohoziński, S. G.; Starosta, K.; Próchniak, L.; Grodner, E.

doi:10.1140/epja/i2009-10860-0

Cited by 46 publications

(22 citation statements)

References 35 publications

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“…Therefore, study of the third and forth bands of the same chiral configuration is needed to answer the question of the investigated robustness. Very recent model calculations predicted multiple chiral doublet bands which belong to the same configuration [28][29][30]. In this Letter we report on the first experimental evidence for such a type of MχD in the 103 Rh nucleus.…”

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confidence: 81%

Multiple Chiral Doublet Bands of Identical Configuration inRh103

et al. 2014

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Three sets of chiral doublet band structures have been identified in the 103 Rh nucleus. The properties of the observed chiral doublet bands are in good agreement with theoretical results obtained using constrained covariant density functional theory and particle rotor model calculations. Two of them belong to an identical configuration, and provide the first experimental evidence for a novel type of multiple chiral doublets, where an "excited" chiral doublet of a configuration is seen together with the "yrast" one. This observation shows that the chiral geometry in nuclei can be robust against the increase of the intrinsic excitation energy.PACS numbers: 21.10. Hw,21.10.Re,23.20.Lv A novel form of spontaneous symmetry breaking, the chiral rotation of triaxial nuclei, was suggested in 1997 [1]. It was shown that in special circumstances, referred to as chiral geometry, in the intrinsic frame of the rotating triaxial nucleus the total angular momentum vector lies outside the three principal planes. Thus, its components along the principal axes can be oriented in leftand right-handed ways. In the laboratory frame the chiral symmetry is restored, which manifests itself as a pair of ∆I = 1 nearly degenerate bands with the same parity. Such chiral doublet bands were first identified in four N = 75 isotones in 2001 [2]. So far, many chiral candidate nuclei have been reported experimentally in the A ∼ 80, 100, 130, and 190 mass regions [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Besides the simplest chiral configurations composed of one unpaired proton and neutron, composite chiral configurations, containing more than one unpaired protons and/or neutrons, have also been observed in the odd-mass or even-even neighbors of the odd-odd chiral nuclei [10,18]. These observations show that chirality is not restricted to a certain configuration in a mass region, i.e. the chiral geometry can be robust against the change of configuration. It was even demonstrated recently by Meng et al. [22][23][24][25], based on adiabatic and configuration-fixed constrained triaxial covariant density functional theory (CDFT) calculations, that it is possible to have multiple pairs of chiral doublet bands in a single nucleus, and the acronym MχD was introduced for this phenomenon. The first experimental evidence for the predicted MχD has been reported in 133 Ce [26], and also possibly in 107 Ag [27].It is also interesting to study the robustness of chiral geometry against the increase of the intrinsic excitation energy, i.e. if the chiral geometry is sustained in the higher-lying bands of a certain chiral configuration. In all the known cases the chiral doublet corresponds to the two lowest-lying bands of a configuration. Even for MχD in133 Ce [26] and 107 Ag [27], each chiral doublet structure corresponds to two lowest-lying bands with a distinct configuration. Therefore, study of the third and forth bands of the same chiral configuration is needed to answer the question of the investigated robustness. Very recent ...

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confidence: 81%

Multiple Chiral Doublet Bands of Identical Configuration inRh103

et al. 2014

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“…These properties are: the existence of nearly degenerate partner bands with the same electromagnetic features and a characteristic staggering pattern of M 1 and E2 transitions with ∆I = 1. In [3] we studied such properties within the Core-Particle-Hole Coupling model [4] using both γ-soft and rigid cores. It turns out that such staggering, obtained by numerical calculations in [3], can be explained by a kind of selections rules following a new, not discussed as yet, symmetry of the model.…”

Section: Introductionmentioning

confidence: 99%

“…In [3] we studied such properties within the Core-Particle-Hole Coupling model [4] using both γ-soft and rigid cores. It turns out that such staggering, obtained by numerical calculations in [3], can be explained by a kind of selections rules following a new, not discussed as yet, symmetry of the model. This symmetry is a combination of the parity operation in the five dimensional space of deformation of the core (we stress that it is not the parity in the ordinary space) and an exchange of states of the unpaired particles.…”

Section: Introductionmentioning

confidence: 99%

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Próchniak¹,

Rohoziński²,

Droste³

et al. 2011

Acta Phys. Pol. B

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“…[50][51][52] Recently, the first experimental evidence for such a new type of MχD was reported in 103 Rh. 53 In this invited talk, we will briefly review the recent progresses of nuclear chirality including the collective Hamiltonian for chiral modes, 13 the resolution of chiral conundrum of crossing bands in 106 Ag, 40 the first experimental evidences for MχD bands with the distinct configurations in 133 Ce and the identical configuration in 103 Rh.…”

Section: Historical Reviewmentioning

confidence: 99%

“…Subsequently, it is pointed out that the phenomenon of MχD may also exist with the same particle-hole configuration, i.e., not only the yrast and yrare bands but also two higher excited bands might be chiral partners. [50][51][52] In the following, the corresponding experimental evidences of the two kinds of MχD observed in 133 Ce 48 and 103 Rh 53 will be briefly introduced. For the details, see Refs.…”

Section: Experimental Achievement Ii: Multiple Chiral Doublet Bands -Mχdmentioning

confidence: 99%

Chirality in atomic nuclei: 2013

Meng

Chen

Zhang

2014

Int. J. Mod. Phys. E

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Progresses of the chirality in atomic nuclei are reviewed, in particular, the recently proposed collective Hamiltonian based on tilted axis cranking approach to describe chiral vibration and rotation modes, and the experimental achievements for chirality and multiple chiral doublets, i.e., in 106 Ag, 133 Ce and 103 Rh. The first experimental evidences of multiple chiral doublet bands with distinct and identical configuration found in 133 Ce and 103 Rh are discussed in detail.

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Chiral bands in odd-odd nuclei with rigid or soft cores

Cited by 46 publications

References 35 publications

Multiple Chiral Doublet Bands of Identical Configuration inRh103

Multiple Chiral Doublet Bands of Identical Configuration inRh103

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Chirality in atomic nuclei: 2013

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