Questioning the wobbling interpretation of low-spin bands in 
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-soft nuclei within the interacting boson-fermion model

Nomura, K.; Petrache, C. M.

doi:10.1103/physrevc.105.024320

Cited by 9 publications

(6 citation statements)

References 53 publications

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“…In order to deeply understand the properties of the low spin bands in 135 Pr, the quasiparticle-plus-triaxial-rotor (QTR ) and the interacting boson-fermion (IBMF) models were employed [35,36]. In those works the frozen approximation of the particle angular momentum was not adopted, nor was the modification of the relative magnitude of the irrotational-flow moments of inertia, and in particular the increase the moment of inertia along the short axis, as was the case in the QTR calculations of Refs.…”

Section: Wobbling Motion In Odd-a Triaxial Nucleimentioning

confidence: 99%

“…In Ref. [36], an alternative interpretation of the identified low-spin yrast and excited bands in 135 Pr was also discussed. The calculated mixing ratios of the ∆I = 1 linking transitions between one-phonon band to zero-phonon band, and two-phonon band to one-phonon band are consistently smaller in magnitude than the experimental values.…”

Section: Wobbling Motion In Odd-a Triaxial Nucleimentioning

confidence: 99%

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Wobbling motion in nuclei

Petrache¹,

Lv²

2023

Preprint

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Wobbling motion as an exotic collective mode in nuclei without axial symmetry, was intensively discussed during the last few years. The observation of the newly proposed transverse wobbling, first reported in $^{135}$Pr and soon after in nuclei from other mass regions, was considered as a significant discovery in low-spin nuclear structure. However, both the reported experimental results and the proposed theoretical models were lively questioned in a series of works devoted to the investigation of the low-spin wobbling mode in the same nucleus. The electromagnetic properties of the $\Delta I=1$ transitions connecting the one- to zero-phonon and the two- to one-phonon wobbling bands in $^{135}$Pr were recently remeasured, demonstrating their predominant $M1$ magnetic character which is in contradiction with the wobbling motion interpretation. These new experimental observables being well reproduced by both quasiparticle-plus-triaxial-rotor model and interacting boson-fermion model calculations, are against the previously proposed wobbling characteristics of the low-spin bands in $^{135}$Pr. On the other hand, we obtained conclusive experimental evidence for the theoretically suggested transverse wobbling bands at medium spin in $^{136}$Nd. The comparison of the experimental data with calculations utilizing the triaxial projected shell model and a new developed particle-rotor model with frozen orthogonal geometry of the active nucleons, supports the description in terms of transverse wobbling of medium-spin bands in triaxial even-even nuclei.

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Section: Wobbling Motion In Odd-a Triaxial Nucleimentioning

confidence: 99%

Section: Wobbling Motion In Odd-a Triaxial Nucleimentioning

confidence: 99%

Wobbling motion in nuclei

Petrache¹,

Lv²

2023

Preprint

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“…The nature of the low-lying bands in 135 Pr has been investigated using the quasiparticleplus-triaxial-rotor (QTR) and the interacting boson-fermion (IBFM) models [33,34]. In contrast with the QTR calculations of refs.…”

Section: Wobbling Motion In Odd-a Triaxial Nucleimentioning

confidence: 99%

Wobbling Motion in Nuclei

Petrache

2023

Symmetry

Self Cite

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Wobbling motion as an exotic collective mode in nuclei without axial symmetry, was intensively discussed during the last few years. The observation of the newly proposed transverse wobbling, first reported in 135Pr and soon after in nuclei from other mass regions, was considered as a significant discovery in low-spin nuclear structure. However, both the reported experimental results and the proposed theoretical models were actively questioned in work devoted to the study of the low-spin wobbling mode in the same nuclei. We recently re-measured the electromagnetic character of the ΔI=1 transitions connecting the one- to zero-phonon and the two- to one-phonon wobbling bands in 135Pr, showing their predominant M1 magnetic character, which is in contradiction with the wobbling interpretation. These new experimental results, which were reproduced by either the quasiparticle-plus-triaxial-rotor model and interacting boson-fermion model calculations, are against the previously proposed wobbling nature of the low-spin bands in 135Pr. On the other hand, we obtained conclusive experimental evidence for the theoretically proposed transverse wobbling bands at medium spin in 136Nd. The comparison of the experimental data with calculations using the triaxial projected shell model as well as a new particle-rotor model with frozen orthogonal geometry of the active nucleons, supports the description in terms of transverse wobbling of medium-spin bands in triaxial even-even nuclei.

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“…Since Xe isotopes are well known to have triaxial shapes [5], searching for the wobbling bands even in the heavier Xe nuclei would be promising. However, very recently most of these wobbling assignments were questioned from theoretical and/or experimental perspectives [15,16]. Hence, besides searching for the wobbling bands, proper identification of the unfavored signature partner band is essential to understand the nuclear structure of triaxial nuclei and to avoid any misinterpretation of the wobbling phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Search for the origin of wobbling motion in the A≈130 region: The case of Xe131

Chakraborty¹,

Bhattacharyya²,

Banik³

et al. 2023

Phys. Rev. C

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In-beam γ -ray spectroscopy of 131 Xe was carried out to study the structure of the intruder νh 11/2 band. Excited states were populated via an α-induced fusion-evaporation reaction at E α = 38 MeV. Inspection of γ γ -coincidence data resulted in the identification of a new rotational sequence. Based on the systematics of excitation energy, assigned spin-parity, decay pattern, and the electromagnetic character of the interband I = 1 γ transitions, this sequence is proposed as the unfavored signature partner of the νh 11/2 band. The structure of this band is further illuminated in the light of the triaxial particle rotor model (TPRM). The possibility of wobbling excitation in N = 77 Xe-Ba-Ce isotones was explored in a systematic manner.

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Questioning the wobbling interpretation of low-spin bands in γ -soft nuclei within the interacting boson-fermion model

Cited by 9 publications

References 53 publications

Wobbling motion in nuclei

Wobbling motion in nuclei

Wobbling Motion in Nuclei

Search for the origin of wobbling motion in the A≈130 region: The case of Xe131

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