2008
DOI: 10.1103/physrevlett.100.102501
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Motional Narrowing and Ergodic Bands in Excited Superdeformed States ofHg194

Abstract: The E(gamma) - E(gamma) coincidence spectra from the electromagnetic decay of excited superdeformed states in (194)Hg reveal surprisingly narrow ridges, parallel to the diagonal. A total of 100-150 excited bands are found to contribute to these ridges, which account for nearly all the unresolved E2 decay strength. Comparison with theory suggests that these excited bands have many components in their wave functions, yet they display remarkable rotational coherence. This phenomenon can be explained in terms of t… Show more

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Cited by 10 publications
(7 citation statements)
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“…The present results differ from the peculiar case of 194 Hg, where exceptionally narrow (≈10 keV) ridges have been observed in coincidence with the SD yrast, exhausting nearly all E2 decay strength and collecting the population of an extremely large number of discrete bands ( 100). This has been interpreted as an example of an ergodic nuclear system [24]. In the present work, the ridge structures in 151 Tb are found to be much wider, being of the order of 20 keV in the Total matrix and 16 keV in the SD-gated one, similar to the values previously reported in the analysis of both ND and SD nuclei [2,4].…”
Section: Fig 5 (Color Online)supporting
confidence: 90%
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“…The present results differ from the peculiar case of 194 Hg, where exceptionally narrow (≈10 keV) ridges have been observed in coincidence with the SD yrast, exhausting nearly all E2 decay strength and collecting the population of an extremely large number of discrete bands ( 100). This has been interpreted as an example of an ergodic nuclear system [24]. In the present work, the ridge structures in 151 Tb are found to be much wider, being of the order of 20 keV in the Total matrix and 16 keV in the SD-gated one, similar to the values previously reported in the analysis of both ND and SD nuclei [2,4].…”
Section: Fig 5 (Color Online)supporting
confidence: 90%
“…In addition, in the case of SD nuclei, one has to consider the coupling between excited SD and ND configurations, which is usually described as a tunneling process through the potential barriers separating the two wells [20,21]. For these reasons, the γ decay in the SD regime is poorly known: up to now only partial experimental information is available for a few SD nuclei [2,3,[22][23][24], and the interpretation of the data is based on rather schematic models [2,22,24] or depends on several parameters [3,23].…”
Section: Introductionmentioning
confidence: 99%
“…It is found that the intensity of the SD-gated ridges accounts for almost the entire E2 strength up to spin 55h in 151 Tb and 35 h in 196 Pb, corresponding to the plateau regions of the SD yrast, while at higher spins the ridge intensity drops to less than half of the E2 bump, indicating that most of the feeding of the SD yrast comes from fragmented rotational bands in the region where rotational damping largely dominates [1]. This differs from the peculiar case of 194 Hg, were an exceptionally narrow ridge, exhausting nearly all E2 decay strength has been interpreted as a signature of ergodicity in a nuclear system [12]. Additional information on the dynamics of the γ-decay in the SD well and on the coupling with the ND states can be obtained estimating the number of discrete bands populating the ridge structures from the analysis of the fluctuations of the counts in the γ-coincidence matrices [1,2].…”
contrasting
confidence: 38%
“…The study of superdeformed (SD) nuclei requires, in fact, high selectivity and high statistics experiments, in order to focus on the small fraction of the γ-decay (≈ few %) which finally gets trapped into the SD well and populates discrete rotational bands. At present, there is only partial experimental information available for few SD nuclei [8,9,10,11,12], whose interpretation is based on models which are either rather schematic [9,11,12] or depend on several parameters [8,10].…”
mentioning
confidence: 99%
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