Fluctuation analysis of rotational spectra

Døssing, T.; Herskind, B.; Leoni, S.; Bracco, A.; Broglia, R. A.; Matsuo, Masayuki; Vigezzi, E.

doi:10.1016/0370-1573(95)00060-7

Cited by 80 publications

(128 citation statements)

References 42 publications

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“…Here, the number of rotational bands corresponds to the experimental effective number of paths which can be obtained from E γ × E γ spectrum by the fluctuation analysis method [8,9].…”

Section: Resultsmentioning

confidence: 99%

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Rotational damping in a multi-j shell particles-rotor model

et al. 2005

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The damping of collective rotational motion is investigated by means of particles-rotor model in which the angular momentum coupling is treated exactly and the valence nucleons are in a multi-j shell mean-field. It is found that the onset energy of rotational damping is around 1.1 MeV above yrast line, and the number of states which form rotational band structure is thus limited. The number of calculated rotational bands around 30 at a given angular momentum agrees qualitatively with experimental data. The onset of rotational damping takes place gradually as a function of excitation energy. It is shown that the pairing correlation between valence nucleons has a significant effect on the appearance of rotational damping.

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“…Here, the number of rotational bands corresponds to the experimental effective number of paths which can be obtained from E γ × E γ spectrum by the fluctuation analysis method [8,9].…”

Section: Resultsmentioning

confidence: 99%

“…Fig. 7 shows the calculated number of rotational bands as well as the experimental effective number of paths [9] for nucleus 168 Yb. The solid line represents the result with the criterion S αI+2,α ′ I > 0.707 while the dashed line is calculated with condition n branch < 2.…”

Section: Resultsmentioning

confidence: 99%

Rotational damping in a multi-j shell particles-rotor model

et al. 2005

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“…Rare-earth nuclei previously analysed with respect to ridge fluctuations, 168 Yb, 163 Tm, and 164 Yb, were found to possess around ∼ 25 regular rotational bands [4,5]. It appears that the surplus of bands in 163 Er are actually high-K bands, which do not exist in the other…”

Section: Effective Number Of Bandsmentioning

confidence: 97%

“…With the same experiments, one can also analyze the quasicontinuum spectra of γ-rays emitted from states of somewhat higher thermal excitation energy [3][4][5][6]. In this case, one can probe the feeding into specific configurations by gating on selected low lying transitions.…”

Section: Introductionmentioning

confidence: 99%

Violation and persistence of the K-quantum number in warm rotating nuclei

et al. 2004

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The validity of the K-quantum number in rapidly rotating warm nuclei is investigated as a function of thermal excitation energy U and angular momentum I, for the rare-earth nucleus 163 Er. The quantal eigenstates are described with a shell model which combines a cranked Nilsson mean-field and a residual two-body interaction, together with a term which takes into account the angular momentum carried by the K-quantum number in an approximate way. K-mixing is produced by the interplay of the Coriolis interaction and the residual interaction; it is weak in the region of the discrete rotational bands (U < ∼ 1MeV), but it gradually increases until the limit of complete violation of the K-quantum number is approached around U ∼ 2 − 2.5 MeV.The calculated matrix elements between bands having different K-quantum numbers decrease exponentially as a function of ∆K, in qualitative agreement with recent data.

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“…The fluctuations of counts in each channel of the selected γ − γ spectra, expressed as variance and covariance, are evaluated by the program STATFIT [4,5] and stored into matrices. Because each rotational E γ -cascade contributes on the average one count in each …”

Section: The Experimentsmentioning

confidence: 99%

Conservation of the K-quantum number in warm nuclei

et al. 2005

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The selection rules on the K-quantum number in rapidly rotating warm nuclei are investigated analyzing quasi-continuum spectra feeding into low-K and high-K bands in 163 Er. The data are compared to simulated spectra obtained using the band mixing model predictions including the residual interaction and a term representing the effect of the Kquantum number on the rotational energy. K-selection rules are found to be obeyed by the decay along excited unresolved rotational bands of heat energy up to around 1.2 MeV and angular momentum 30h ≤ I ≤ 40h. In contrast, the results corresponding to higher heat energy of 1.2 to 2.5 MeV indicate that the selection rules are only partially satisfied.

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Fluctuation analysis of rotational spectra

Cited by 80 publications

References 42 publications

Rotational damping in a multi-j shell particles-rotor model

Rotational damping in a multi-j shell particles-rotor model

Violation and persistence of the K-quantum number in warm rotating nuclei

Conservation of the K-quantum number in warm nuclei

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