Reduced transition probabilities along the yrast line in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">W</mml:mi><mml:mprescripts /><mml:none /><mml:mn>166</mml:mn></mml:mmultiscripts></mml:math>

Sayğı, B.; Joss, D. T.; Page, R. D.; Grahn, T.; Simpson, John; O’Donnell, D.; Alharshan, G.A.; Auranen, K.; Bäck, T.; Boening, S.; Braunroth, T.; Carroll, R.; Cederwall, B.; Cullen, D. M.; Dewald, Α.; Doncel, M.; Donosa, L.; Drummond, M. C.; Ertuğral, F.; Ertürk, S.; Fransen, C.; Greenlees, P. T.; Hackstein, M.; Hauschild, K.; Herzáň, A.; Jakobsson, U.; Jones, P.; Julin, R.; Juutinen, S.; Konki, J.; Kroell, T.; Labiche, M.; Лопез-Мартенс, А.; McPeake, C.; Moradi, F. Ghazi; Moeller, O.; Mustafa, M M; Nieminen, P.; Pakarinen, J.; Partanen, J.; Peura, P.; Procter, M. G.; Rahkila, P.; Rother, W.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Scholey, C.; Sorri, J.; Stolze, S.; Taylor, M. J.; Thornthwaite, A.; Uusitalo, J.

doi:10.1103/physrevc.96.021301

Cited by 21 publications

(4 citation statements)

References 38 publications

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“…The B(E 2; 4 + 1 → 2 + 1 ) of 0.21(0.05) e 2 b 2 is, in contrast to the "normal" B(E 2; 2 + 1 → 0 + 1 ), surprisingly small, resulting in a B 4/2 ratio of 0.38 (11). Similar results were obtained in 166 W [28], 168 Os [23], and 172 Pt [29]. Based on those measurements, Cederwall et al [29] proposed a transition at N = 94 from a collective regime into a senioritylike scheme as a possible explanation for the B 4/2 < 1, despite the presence of a large number of valence nucleons.…”

Section: Discussionsupporting

confidence: 77%

“…It is worth pointing out that for 168 Os Grahn et al [23] measured a reduced transition probability for the yrast 4 + resulting in B 4/2 = B(E 2; 4 + 1 → 2 + 1 )/(B(E 2; 2 + 1 → 0 + 1 ) = 0.34 (18). A B 4/2 < 1 is very rare throughout the nuclear chart, with only a handful of examples away from closed shell nuclei, e.g., 48,50 Cr [24], 72,74 Zn [25], 114 Te [26], 114 Xe [27], 166 W [28], 168 Os [23], and 172 Pt [29]. These observations have not been reproduced so far by any type of state-of-the-art nuclear structure calculations, neither large-scale shell models nor beyond-mean-field models.…”

Section: Introductionmentioning

confidence: 99%

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B(E2) anomalies in the yrast band of Os170

et al. 2019

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Background:The neutron-deficient osmium isotopic chain provides a great laboratory for the study of shape evolution, with the transition from the soft triaxial rotor in 168 Os to the well-deformed prolate rotor in 180 Os, while shape coexistence appears around N = 96 in 172 Os. Therefore, the study of the Os isotopic chain should provide a better understanding of shape changes in nuclei and a detailed scrutiny of nuclear structure calculations. In this paper, the lifetimes of the low-lying yrast states of 170 Os have been measured for the first time to investigate the shape evolution with neutron number. Purpose: Lifetimes of excited states in the ground-state band of 170 Os are measured to investigate the shape evolution with neutron number in osmium isotopes and compare with state-of-the-art calculations. Methods: The states of interest were populated via the fusion-evaporation reaction 142 Nd( 32 S, 4n) at a bombarding energy of 170 MeV at the ALTO facility from IPN (Orsay, France). Lifetimes of the 2 + 1 and 4 + 1 states in 170 Os were measured with the recoil-distance Doppler-shift method using the Orsay universal plunger system.Results: Lifetimes of the two first excited states in 170 Os were measured for the first time. A very small B(E 2; 4 + 1 → 2 + 1 )/B(E 2; 2 + 1 → 0 + 1 ) = 0.38(11) was found, which is very uncharacteristic for collective nuclei. These results were compared to state-of-the-art beyond-mean-field calculations. Conclusions: Although theoretical results give satisfactory results for the energy of the first few excited states in 170 Os and the B(E 2; 2 + 1 → 0 + 1 ) they fail to reproduce the very small B(E 2; 4 + 1 → 2 + 1 ), which remains a puzzle.

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Section: Discussionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

B(E2) anomalies in the yrast band of Os170

et al. 2019

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“…Despite the large uncertainties this is a rather small value. Such small B 4/2 ratios are rarely observed [24][25][26][27][28]. In nuclei near closed shells small B 4/2 ratios are usually interpreted as a manifestation of seniority dominated structures [4][5][6].…”

Section: Discussionmentioning

confidence: 99%

Lifetimes of the 41+ states of Po206 and Po204<

Stoyanova¹,

Rainovski²,

Jolie³

et al. 2019

Phys. Rev. C

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Low-lying yrast states of 204 Po and 206 Po were investigated by the γ -γ fast timing technique with LaBr3(Ce) detectors. Excited states of these nuclei were populated in the 197 Au( 11 B,4n) 204 Po and the 198 Pt( 12 C,4n) 206 Po fusion-evaporation reactions, respectively. The beams were delivered by the FN-Tandem accelerator at the University of Cologne. The lifetimes of the 4 + 1 states of both nuclei were measured, along with an upper lifetime limit for the 2 + 1 state of 204 Po. A comparison between the derived B(E2; 4 + 1 → 2 + 1 ) values and results from simplified empirical two-state mixing calculations suggests that for the 4 + 1 states of even-even polonium isotopes the transition from single particle mode at N = 126 to collective mode, when reducing the number of neutrons, occurs above N = 122.

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“…Some experimental requirements remain to deepen our understanding on γ-soft triaxiality and its relationship with the higher-order interactions. In recent experimental investigations, a cluster of extremely neutron-deficient nuclei 168 Os [23], 166 W [24],…”

Section: B(e2)mentioning

confidence: 99%

New γ-soft rotation in the interacting boson model with SU(3) higher-order interactions *

Wang¹

2022

Chinese Phys. C

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The interacting boson model with SU(3) higher-order interactions offers a new route to enlarge our understanding on γ-soft rotation. In this paper, U(5)-like and O(6)-like new γ-softness are found, in which the corresponding energy levels in the ground band and the quasi-γ band can be exactly degenerate, and have a partial O(5) dynamical symmetry. The spherical-like γ-softness is not related to the classical O(6) dynamical symmetry. The transitional behaviors of B(E2) values of the low-lying levels, and quadrupole moment of the 2+ 1 state are also discussed. Spherical-like γ-softness can be used to explain the low-lying spectra and B(E2) values in 110 Cd normal states.

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Reduced transition probabilities along the yrast line in W166

Cited by 21 publications

References 38 publications

B(E2) anomalies in the yrast band of Os170

B(E2) anomalies in the yrast band of Os170

Lifetimes of the 41+ states of Po206 and Po204<

New γ-soft rotation in the interacting boson model with SU(3) higher-order interactions *

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