Decay Out of Low Spin Superdeformed States in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>194</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>by Weak Mixing with Normal Deformed States

Krücken, R.; Dewald, Α.; Sala, P.; Meier, Christoph; Tiesler, H.; Altmann, J.; Zell, K. O.; Brentano, P. von; Bazzacco, D.; Rossi‐Alvarez, C.; Burch, R.; Menegazzo, R.; Angelis, G. de; Maron, G.; Poli, M.

doi:10.1103/physrevlett.73.3359

Cited by 23 publications

(15 citation statements)

References 15 publications

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“…We use data given in Refs. [7][8][9][10] to deduce values for G # in 192,194 Hg and 194 Pb. We test our procedure by comparing the values of G S obtained in that same analysis with predictions based on properties of the SD band.…”

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confidence: 99%

Spreading Width for Decay Out of a Superdeformed Band

1998

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The attenuation factor F responsible for the decay out of a superdeformed (SD) band is calculated with the help of a statistical model. This factor is given by F ͑1 1 G # ͞G S ͒ 21 . Here, G S is the width for the collective E2 transition within the superdeformed band, and G # is the spreading width which describes the mixing between a state in the SD band and the normally deformed (ND) states of equal spin. The attenuation factor F is independent of the statistical E1 decay widths G N of the ND states provided that G N ¿ G # , G S . This condition is generically met. Previously measured values of F are used to determine G # . [S0031-9007(98)

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confidence: 99%

Spreading Width for Decay Out of a Superdeformed Band

1998

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“…Qualitatively similar enhancement effects work in many other situations, for example, in mixing of superdeformed bands with bands of "normal" deformation [31][32][33]. This physics also defines the excitation energy of structure isomers that would allow their mixing with other states and trigger their decay [34].…”

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confidence: 85%

Atomic Nucleus as Chaotic Quantum Many-Body System

Zelevinsky

2015

Acta Phys. Pol. A

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Quantum many-body chaos is described as a practical (theoretical, experimental, and computational) instrument in physics of mesoscopic systems of interacting particles. Using mainly nuclear physics applications, it is shown that interactions of constituents create stationary states of high complexity with respect to the nean-field basis with observable properties smoothly changing along the spectrum. Both local Gaussian orthogonal ensemble type features and the global evolution along the spectrum are used to understand the many-body physics and define thermodynamic properties of isolated mesoscopic objects. Among the examples discussed, especially interesting is a chaotic enhancement of weak perturbations illustrated by a large parity violation in neutron resonances on heavy nuclei. Artificially introduced chaotic elements are used to explore the nuclear landscape and predict phase transformations.

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“…In the following, we have used the methods described in Ref. [17] to obtain estimates of the ND level densities and decay widths, together with values of S based on measured lifetimes and measured quadrupole moments [19][20][21][22][23]. Previously, we suggested an angular momentum dependent parametrization of the backshift parameter which characterizes the strength of pairing correlations [17]: in the current work, we examine the effect of neglecting the effects of pairing correlations at low spins or using the variable form.…”

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Intensity profiles of superdeformed bands in Pb isotopes in a two-level mixing model

Wilson¹,

Szigeti²,

Davidson

et al. 2009

Phys. Rev. C

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A recently developed two-level mixing model of the decay out of superdeformed bands is applied to examine the loss of flux from the yrast superdeformed bands in 192 Pb, 194 Pb, and 196 Pb. Probability distributions for decay to states at normal deformations are calculated at each level. The sensitivity of the results to parameters describing the levels at normal deformation and their coupling to levels in the superdeformed well is explored. It is found that except for narrow ranges of the interaction strength coupling the states, the amount of intensity lost is primarily determined by the ratio of γ decay widths in the normal and superdeformed wells. It is also found that while the model can accommodate the observed fractional intensity loss profiles for decay from bands at relatively high excitation, it cannot accommodate the similarly abrupt decay from bands at lower energies if standard estimates of the properties of the states in the first minimum are employed.

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Decay Out of Low Spin Superdeformed States inPb194by Weak Mixing with Normal Deformed States

Cited by 23 publications

References 15 publications

Spreading Width for Decay Out of a Superdeformed Band

Spreading Width for Decay Out of a Superdeformed Band

Atomic Nucleus as Chaotic Quantum Many-Body System

Intensity profiles of superdeformed bands in Pb isotopes in a two-level mixing model

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