Evidence against the wobbling nature of low-spin bands in 135Pr

Lyu, Bo; Petrache, C. M.; Lawrie, E. A.; Guo, S.; Astier, A.; Dupont, E.; Zheng, Kaikai; Ong, H. J.; Wang, J. G.; Zhou, X. H.; Sun, Zhen; Greenlees, P. T.; Badran, H.; Calverley, T.; Cox, D. M.; Grahn, T.; Hilton, J.; Julin, R.; Juutinen, S.; Konki, J.; Pakarinen, J.; Papadakis, P.; Partanen, J.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Scholey, C.; Sorri, J.; Stolze, S.; Uusitalo, J.; Cederwall, B.; Ertoprak, A.; Liu, H.; Kuti, I.; Tímár, J.; Tucholski, A.; Srebrny, J.; Andreoiu, C.

doi:10.1016/j.physletb.2021.136840

Cited by 13 publications

(22 citation statements)

References 34 publications

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“…As a result, the second excited 19/2 − state is proposed as the band-head of the new band in 135 Pr that consists of the transitions of 688-and 871-keV with intensities significantly larger than the transition of 827-keV, and in agreement with the expected approximate I(I + 1) dependence of a rotational band Ref. [35]. A possible new rotational band built on the third excited 23/2 − state, with the 764-keV transition as the initial transition was also observed, while the 1009-keV transition reported in Ref.…”

Section: Wobbling Motion In Odd-a Triaxial Nucleisupporting

confidence: 74%

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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 Nucleisupporting

confidence: 74%

“…Mixing ratio values |δ| < 1 have been obtained for the 747-, 813-and 450-keV transitions in Ref. [35], see Figure 1. These results are in contradiction with the |δ| >1 values reported in Refs.…”

Section: Wobbling Motion In Odd-a Triaxial Nucleimentioning

confidence: 90%

Wobbling motion in nuclei

Petrache¹,

Lv²

2023

Preprint

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“…It should be also mentioned that another extraction method of mixing ratio is using the angular distribution alone, but this method always yield two solutions of mixing ratio, and one cannot safely exclude any of them only from the best fit of angular distribution curve, see Refs. [23][24][25][26][27].…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

“…It was proven that the zero-and one-quasiparticle bands can be approximated with wobbling motion only at high spin. Currently, based on new experimental data and new theoretical calculations, the recently reported low-spin wobbling bands are seriously questioned [18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Experimental evidence for transverse wobbling bands in Nd136

Lyu¹,

Petrache²,

Budaca³

et al. 2022

Phys. Rev. C

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The nature of two high-spin bands in 136 Nd built on the two-quasiparticle configuration π h 2 11/2 , predicted by the triaxial projected shell model as good candidates of transverse wobbling bands, are investigated experimentally. The mixing ratio of one I = 1 transition connecting the one-phonon and the zero-phonon wobbling bands is established from a high-statistics JuroGam II γ -ray spectroscopy experiment by using the combined angular correlation and linear polarization method. The resulting wobbling excitation energy and ratios of reduced electromagnetic transition probabilities are in good agreement with results of a new particle-rotor model which rigidly couples the total angular momentum of two quasiparticles to a triaxial core in an orthogonal geometry, confirming thus the transverse wobbling nature of the bands.

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“…So-called 'unfavoured signature partner' of πh 11/2 [νh 11/2 ] band, after some addition and/or alteration, in 135 Pr (Matta et al, 2015) and 133 La (Biswas et al, 2019) [ 127 Xe (Chakraborty et al, 2020) and 133 Ba (Rojeeta Devi et al, 2021)] is re-interpreted in terms of wobbling excitation based on the large δ value of the connecting γ-transitions. However, the wobbling interpretation of some of these lowlying bands is questioned severely in the light of recent experimental as well as theoretical results (Lv et al, 2022). Thus, it becomes important to revisit the available experimental data in this mass region.…”

Section: Introductionmentioning

confidence: 99%

A study on multipole mixing ratio of γ-transitions from unfavoured to favoured signature partner of the πh11/2 band in 129Cs

Chakraborty¹

2022

JSR

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Angular distribution coefficients, a2 and a4, of the ∆I = 1 γ-transitions between the α = ±1/2 signature partners of πh11/2 band in 129Cs have been estimated for different multipole mixing ratio (δ) and compared with their experimental values available in the literature. From this study, a considerable amount of the E2 admixture is found in these transitions, especially at higher angular momentum. This provides further evidence for tri-axial nuclear shapes in 129Cs.

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Evidence against the wobbling nature of low-spin bands in 135Pr

Cited by 13 publications

References 34 publications

Wobbling motion in nuclei

Wobbling motion in nuclei

Experimental evidence for transverse wobbling bands in Nd136

A study on multipole mixing ratio of γ-transitions from unfavoured to favoured signature partner of the πh11/2 band in 129Cs

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