Low spin states in 130Ba

Kirch, K.; Siems, G.; Eschenauer, M.; Gelberg, A.; Kühn, Reimer; Mertens, Armin; Neuneyer, U.; Vogel, O.; Wiedenhöver, I.; Brentano, P. von; Otsuka, Takaharu

doi:10.1016/0375-9474(94)00806-x

Cited by 34 publications

(18 citation statements)

References 28 publications

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“…An arbitrary value of the Lipas parameter (α) had earlier been used in the triaxial rotation vibration model (TRVM) [16], O(6) limit of the interacting boson model (IBM; O(6)) [12], and interacting boson approximation -consistent Q formalism (IBA-CQF) [17,18] for renormalization of excitation energies but it remained only partially successful. Hilbert space is too limited to describe the full variation of the moment of inertia and, therefore, the Lipas Ansatz is made to correct the ARM energies, which also conserve the good results of B(E2) values.…”

Section: Present Approachmentioning

confidence: 99%

Evidence of rigid triaxiality in some xenon nuclei

Singh¹,

Bihari²,

Singh³

et al. 2007

Can. J. Phys.

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The present study deals with a topic of current interest, getting clear evidence for triaxiality in the 120−130 Xe nuclei near A = 130. The odd-even staggering in a so-called gamma-vibrational band may be treated using the asymmetric rotor model (ARM) on employing the Lipas parameter. The Hilbert space is too limited to describe the full variation of the moment of inertia and, therefore, the Lipas Ansatz is made to correct the ARM energies, which conserve the good result for B(E2) values.Résumé : Cette étude se concentre sur un sujet d'intérêt actuel en cherchant une preuve manifeste du caractère triaxial des noyaux 120−130 Xe près de A = 130. L'étalement pairimpair dans la bande dite gamma-vibrationnelle peut être étudié dans le modèle du rotateur asymétrique (ARM) en utilisant le paramètre de Lipas. L'espace de Hilbert est trop limité pour décrire la variation complète du moment d'inertie et l'ansatz de Lipas a pour but de corriger les énergies ARM , tout en préservant les bonnes valeurs des B(E2).[Traduit par la Rédaction]

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Section: Present Approachmentioning

confidence: 99%

Evidence of rigid triaxiality in some xenon nuclei

Singh¹,

Bihari²,

Singh³

et al. 2007

Can. J. Phys.

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“…Earlier some authors applied the Lipas Ansatz for evaluating perturbed energies in the triaxial rotation-vibration model in which a fixed value of a (Lipas parameter) is introduced [6] with the plea that Hilbert space is too limited to describe the full variation of the moment of inertia. Such corrections in energies were also applied earlier in the O (6) limit of the interacting boson model {IBM; O(6)} [23] and interacting boson approximation consistent Q formalism (IBA-CQF) [24,25] but remained partially successful. In the present work, parameter b (similar to a) is not kept static but assumed to change with the angular momentum and has been evaluated by fitting the experimental energies.…”

Section: Discussionmentioning

confidence: 96%

Ground and gamma band energy systematics in even xenon and barium nuclei

et al. 2010

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Rotation-vibration coupling parameter b at different spins is calculated on fitting the experimental energy for each nucleus in the framework of the General Asymmetric Rotor Model (Zhi. Phys. Rev. C, 51, 141 (1995)). Taking the even and odd spin energy sequences of the gamma band as separate bands besides the yrast band at large asymmetry (g 208), three values of the moment of inertia parameters a (a r , a e , and a o ) are calculated from the band head energies. A striking correlation in a and b versus the product of the number of valance protons and neutrons (NpNn) is obtained. These trajectories and the g versus NpNn correlation (Yan et al. Phys. Rev. C, 48, 1046) are capable of predicting the unknown energies of the ground and gamma bands of even xenon and barium nuclei, knowing only an external parameter NpNn. This introduces the possibility of a simpler description of the structural evolution of these transitional nuclei.Résumé : Nous calculons le paramètre b de couplage rotation-vibration en ajustant l'énergie expérimentale E ln pour chaque noyau dans le modèle du Rotateur Asymétrique Généralisé (GARM) (Zhi. Phys. Rev. C, 51, 141 (1995)). En prenant les séquences de spin pair et impair de la bande gamma comme deux bandes différentes à grande symétrie (g 208), nous calculons deux valeurs pour le paramètre a (a c et a 0 ) et une autre valeur a r pour la bande du fondamental à partir des énergies des têtes de bande. Nous obtenons une corrélation étonnante dans a et b versus N p N n , le produit du nombre de protons et de neutrons de valence. Ces trajectoires, avec la corrélation g -N p N n , (Yan et al. Phys. Rev. C, 48, 1046), permettent de prédire les énergies inconnues des bandes du fondamental et g même du Xe et du Ba, sous la seule connaissance du paramètre extérieur et N p N n , ce qui indique la possibilité d'une description plus simple de l'évolution structurelle de ces éléments de transition.[Traduit par la Rédaction]

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“…Such high-K isomers are also known in the deformed rare-earth nuclei with A ≈ 160−180, like the Os and W nuclei [4]. The 130 Ba nucleus also exhibits a γ-band with strong energy staggering between the odd and even spins, a fingerprint of the γ-softness or O(6) symmetry (see [5][6][7]). This softness facilitates the coexistence of different shapes, which can change depending on the specific configuration, rang-ing from prolate to oblate.…”

Section: Introductionmentioning

confidence: 96%

Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A = 130 mass region

et al. 2019

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Several new bands have been identified in 130 Ba, among which there is one with band-head spin 8 + . Its properties are in agreement with the Fermi-aligned νh 2 11/2 , 7/2 − [523] ⊗ 9/2 − [514] Nilsson configuration. This is the first observation of a two-quasiparticle t-band in the A=130 mass region. The t-band is fed by a dipole band involving two additional h 11/2 protons. The odd-spin partners of the proton and neutron S-bands and the ground-state band at high spins are also newly identified. The observed bands are discussed using several theoretical models, which strongly suggest the coexistence of prolate and oblate shapes polarized by rotation aligned two-proton and two-neutron configurations, as well as prolate collective rotations around axes with different orientations. With the new results, 130 Ba presents one of the best and most complete sets of collective excitations that a γ-soft nucleus can manifest at medium and high spins, revealing a diversity of shapes and rotations for the nuclei in the A = 130 mass region.

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Low spin states in 130Ba

Cited by 34 publications

References 28 publications

Evidence of rigid triaxiality in some xenon nuclei

Evidence of rigid triaxiality in some xenon nuclei

Ground and gamma band energy systematics in even xenon and barium nuclei

Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A = 130 mass region

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Low spin states in 130Ba

Cited by 34 publications

References 28 publications

Evidence of rigid triaxiality in some xenon nuclei

Evidence of rigid triaxiality in some xenon nuclei

Ground and gamma band energy systematics in even xenon and barium nuclei

Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A = 130 mass region

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Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A = 130 mass region