Superdeformed band up to spin ∼(127/2 in ^{149}Gd

Haas, B.; Taras, P.; Flibotte, Stéphane; Banville, Frédéric; Gascon, J.; Cournoyer, Sylvie; Monaro, S.; Nadon, N.; Prévost, D.; Thibault, D.; Johansson, J. K.; Tucker, Dylan; Waddington, J. C.; Andrews, H.R.; Ball, G. C.; Hörn, D.; Radford, D. C.; Ward, D. R.; Pierre, Claude; Dudek, J.

doi:10.1103/physrevlett.60.503

Cited by 87 publications

(8 citation statements)

References 10 publications

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“…However, there are some difference, e.g. in our TCDHO calculations the moment of inertia is almost independent of the angular momentum while in our DHO calculations it is an increasing function of L , in contrast with the experimental observation [5] where the moment of inertia is almost constant with a slight tendency to decrease. Another problem is our neglect of a spin-orbit force causing different sub-shell closures.…”

Section: F = ( H ) -W ( L ) -T S + V ( 3 )contrasting

confidence: 93%

“…The electric quadrupole moment is then about 23 eb, and the moment of inertia is 70 h2 MeV-'. These numbers compare nicely with those reported in [5] ( 1 7 k 2 e b and about 87h'MeV-' for the lowest observed state in the band) if one allows for the slightly different neutron number and the lack of free parameters in our calculation. At a rotation of 50h these two minima are already well separated and the TCDHO one is almost 4 MeV lower.…”

Section: F = ( H ) -W ( L ) -T S + V ( 3 )supporting

confidence: 88%

“…Therefore, the fission barrier might not be as close as claimed in [5]. The molecular minimum at 60h has an electric quadrupole moment of about 50 eb and a moment of inertia 210 h2 MeV-' (three times bigger than those experimentally observed).…”

Section: F = ( H ) -W ( L ) -T S + V ( 3 )mentioning

confidence: 79%

“…We have selected 14Nd, the subject of our previous investigations, as a model nucleus, which happens in fact to be very close to recently discovered superdeformed 14Nd [5]. To make the calculations more realistic we use the non-zero temperature approach of [6], choosing a moderate temperature of 1 MeV, just enough to neglect pairing effects but not enough to smear out shell effects.…”

mentioning

confidence: 99%

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Fission stability of superdeformed nuclei

Okołowicz¹,

Irvine²

1989

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

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Using the constrained Hartree-Fock approach, supplemented with rotation and finite temperature, the authors investigated two types of rare-earth nuclear shape, namely ellipsoidal, and molecular two-centre ones. Only the latter exhibits a fission saddle point, but both have minima. At a high angular momentum of 40h(cross) the molecular minimum becomes more favourable and more distinctive in their collective space. It leads them to predict even more deformed and quite different molecular shapes from those already discovered in so-called superdeformed nuclei.

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Section: F = ( H ) -W ( L ) -T S + V ( 3 )contrasting

confidence: 93%

Section: F = ( H ) -W ( L ) -T S + V ( 3 )supporting

confidence: 88%

Section: F = ( H ) -W ( L ) -T S + V ( 3 )mentioning

confidence: 79%

mentioning

confidence: 99%

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Fission stability of superdeformed nuclei

Okołowicz¹,

Irvine²

1989

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

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“…Although, a general understanding of the phenomenon has been achieved, yet many of its aspects lack theoretical modeling. The concept of superdeformation was first proposed to explain the long lived fission isomers observed in some highly deformed actinide nuclei and was confirmed experimentally by observing the superdeformed rotational band in 152 Dy [2,3].…”

Section: Introductionmentioning

confidence: 90%

Properties of superdeformed bands in A < 100 mass region within the variable moment of inertia model

Devi¹,

Matharu²

2021

Phys. Scr.

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The variable moment of inertia (VMI) model has been used to study the properties of superdeformed (SD) bands in A < 100 mass region. The experimental γ-ray (E γ ) transitions energies are least square fitted to obtain the model parameters such as band head moment of inertia, (J 0), and stiffness constant, (C). The observed E γ transition energies obtained using the VMI formula are in excellent agreement with the experimental values. In the paper, we have studied the dynamic moment of inertia (J (2)) and its variation with rotational frequency (ℏ ω). We also studied the ΔI = 2 staggering phenomena in SD bands of 61Zn(SD), 62Zn(SD1), 80Sr(SD1), 81Sr(SD1), 82Sr(SD), 83Sr(SD), 84Zr(SD), 86Zr(SD1), 86Zr(SD4), 87Nb(SD2), 89Tc(SD) and 91Tc(SD) nuclei. The VMI model brings very comprehensive interpretation for spin assignment and to study the properties of SD bands in light mass region nuclei.

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Superdeformation in schnell rotierenden Kernen

Lieder

1988

Phys. Bl.

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In dem Kern 152 Dy beobachteten Twin und Mitarbeiter kürzlich eine Rotationsbande bis zu einem Drehimpuls von 60 ħ [1], deren γ‐Spektrum in Abb. 1 wiedergegeben ist. Es zeigt 19 Übergänge mit einem nahezu konstanten Energieabstand von 47 keV. Das ist ein äußerst ungewöhnliches Resultat, weil es darauf hinweist, daß der Kern 152 Dy in diesen Rotationszuständen ein besonders großes und konstantes Trägheitsmoment von θ = 85 ± 2 ħ2/MeV hat und daß er eine stark elongierte Gestalt annimmt. Betrachtet man ihn als prolat ( „zigarrenförmig”︁ ) deformiertes Rotationsellipsoid, so entspricht dieses Trägheitsmoment einem Verhältnis der langen zur kurzen Halbachse von c/a ≈ 2. Dies wird als superdeformierte Kerngestalt bezeichnet. Im Vergleich dazu haben normal deformierte Kerne der Seltenen Erden im Grundzustand nur ein Achsenverhältnis von c/a ≈ 1, 3. Anhand eines gemessenen Quadrupolmoments von QO = 19 ± 3 eb (1 b = 100 fm2) für die neue Rotationsbande in 152 Dy konnte nachgewiesen werden, daß tatsächlich eine superdeformierte Kerngestalt vorliegt [2]. Bei Drehimpulsen unter 28 ħ nimmt die Intensität der γ‐Linien stark ab, da sich die superdeformierte Bande in Zustände oblater ( „pfannkuchenförmiger”︁) Deformation entvölkert. Dabei muß eine Potentialbarriere durchtunnelt werden.

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Superdeformed band up to spin ∼(127/2 in ^{149}Gd

Cited by 87 publications

References 10 publications

Fission stability of superdeformed nuclei

Fission stability of superdeformed nuclei

Properties of superdeformed bands in A < 100 mass region within the variable moment of inertia model

Superdeformation in schnell rotierenden Kernen

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