Semi-phenomenological description of the chiral bands in<sup>188,190</sup>Os

Râduţâ, A. A.; Raduta, C. M.

doi:10.1088/0954-3899/42/6/065105

Cited by 4 publications

(18 citation statements)

References 38 publications

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“…In Refs. [7,8] we attempted to investigate another chiral system consisting of one phenomenological core with two components, one for protons and one for neutrons, and two quasiparticles whose total angular momentum J F is oriented along the symmetry axis of the core, due to the particle-core interaction. In the quoted references we proved that states of total angular momentum I, where the three components mentioned above carry the angular momenta J p , J n , J F which are mutually orthogonal, do exist.…”

Section: Introductionmentioning

confidence: 99%

“…In choosing the candidate nuclei with chiral features, we were guided by the suggestion [5] that triaxial nuclei may favor orthogonality of the aforementioned three angular momenta and therefore may exhibit a large transverse magnetic moment. In the previous publications, the formalism was applied to 192 Pt, 188 Os and 190 Os, which satisfy the triaxiality signature condition [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, like in Refs. [7,8], we chose another 2qp ⊗ core subspace by changing the ground band states with those of the magnetic dipole band 1 + . The formalism is applied to 138 Nd for which some relevant data are available [23,24].…”

Section: Introductionmentioning

confidence: 99%

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New type of chiral motion in even–even nuclei: the¹³⁸Nd case

Râduţâ

Raduta²,

Petrache

2016

J. Phys. G: Nucl. Part. Phys.

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The pheomenological Generalized Coherent State Model Hamiltonian is amended with a many body term describing a set of nucleons moving in a shell model mean-field and interacting among themselves with paring, as well as with a particle-core interaction involving a quadrupolequadrupole and a hexadecapole-hexdecapole force and a spin-spin interaction. The model Hamiltonian is treated in a restricted space consisting of the core projected states associated to the bands ground, β, γ, γ, 1 + and 1 + and two proton aligned quasiparticles coupled to the states of the ground and dipole bands. The chirally transformed particle-core states are also included.The Hamiltonian contains two terms which are not invariant to the chiral transformations relating the right-handed frame (J F , J p , J n ) and the left-handed ones (−are the angular momenta carried by fermions, proton and neutron bosons, respectively. The energies defined with the particle-core states form four chiral bands, two of them being degenerate in the present formalism. Electromagnetic properties of the chiral bands are investigated. Results are compared with the experimental data on 138 Nd.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

New type of chiral motion in even–even nuclei: the¹³⁸Nd case

Râduţâ

Raduta²,

Petrache

2016

J. Phys. G: Nucl. Part. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In Refs. [136,137] one attempted to investigate another chiral system consisting of one phenomenological core with two components, one for protons and one for neutrons, and two quasiparticles whose total angular momentum J F is oriented along the symmetry axis of the core, due to the particle-core interaction. It was proved that states of total angular momentum I, where the three components mentioned above carry the angular momenta J p , J n , J F which are mutually orthogonal, do exist.…”

Section: A New Type Of Chiral Motion In Even-even Nucleimentioning

confidence: 99%

“…In Ref. [137], the calculations were performed for (a † j a † j ) JJ with J = 0, 2, ...2j − 1. The result was that K = 2j − 1 yields the maximal magnetic dipole transition probabilities.…”

Section: Extension To a Particle-core Systemmentioning

confidence: 99%

Specific features and symmetries for magnetic and chiral bands in nuclei

Râduţâ

2016

Progress in Particle and Nuclear Physics

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Magnetic and chiral bands have been a hot subject for more than twenty years. Therefore, quite large volumes of experimental data as well as theoretical descriptions have been accumulated. Although some of the formalisms are not so easy to handle, the results agree impressively well with the data. The objective of this paper is to review the actual status of both experimental and theoretical investigations. Aiming at making this material accessible to a large variety of readers, including young students and researchers, I gave some details on the schematic models which are able to unveil the main features of chirality in nuclei. Also, since most formalisms use a rigid triaxial rotor for the nuclear system's core, I devoted some space to the semi-classical description of the rigid triaxial as well as of the tilted triaxial rotor. In order to answer the question whether the chiral phenomenon is spread over the whole nuclear chart and whether it is specific only to a certain type of nuclei, odd-odd, odd-even or even-even, the current results in the mass regions of $A\sim 60,80,100,130,180,200$ are briefly described for all kinds of odd/even-odd/even systems. The chiral geometry is a sufficient condition for a system of proton-particle, neutron-hole and a triaxial rotor to have the electromagnetic properties of chiral bands. In order to prove that such geometry is not unique for generating magnetic bands with chiral features, I presented a mechanism for a new type of chiral bands. One tries to underline the fact that this rapidly developing field is very successful in pushing forward nuclear structure studies.Comment: 80 pages, 22 figure

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Multiple chiral doublets in four-j shells particle rotor model: Five possible chiral doublets in 60136Nd76

et al. 2018

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A particle rotor model, which couples nucleons in four single-j shells to a triaxial rotor core, is developed to investigate the five pairs of nearly degenerate doublet bands recently reported in the even-even nucleus 136 Nd. The experimental energy spectra and available B(M 1)/B(E2) values are successfully reproduced. The angular momentum geometries of the valence nucleons and the core support the chiral rotation interpretations not only for the previously reported chiral doublet, but also for the other four candidates. Hence, 136 Nd is the first even-even candidate nucleus in which the multiple chiral doublets exist. Five pairs of chiral doublet bands in a single nucleus is also a new record in the study of nuclear chirality. * Electronic address: mengj@pku.edu.cn

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Semi-phenomenological description of the chiral bands in^188,190Os

Cited by 4 publications

References 38 publications

New type of chiral motion in even–even nuclei: the¹³⁸Nd case

New type of chiral motion in even–even nuclei: the¹³⁸Nd case

Specific features and symmetries for magnetic and chiral bands in nuclei

Multiple chiral doublets in four-j shells particle rotor model: Five possible chiral doublets in 60136Nd76

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Semi-phenomenological description of the chiral bands in188,190Os

Cited by 4 publications

References 38 publications

New type of chiral motion in even–even nuclei: the138Nd case

New type of chiral motion in even–even nuclei: the138Nd case

Specific features and symmetries for magnetic and chiral bands in nuclei

Multiple chiral doublets in four-j shells particle rotor model: Five possible chiral doublets in 60136Nd76

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Product

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Semi-phenomenological description of the chiral bands in^188,190Os

New type of chiral motion in even–even nuclei: the¹³⁸Nd case

New type of chiral motion in even–even nuclei: the¹³⁸Nd case