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Article overview
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First clear evidence of quantum chaos in the bound states of an atomic nucleus | L. Muñoz
; R. A. Molina
; J.M.G. Gómez
; A. Heusler
; | Date: |
1 May 2016 | Abstract: | We study the spectral fluctuations of the $^{208}$Pb nucleus using the
complete experimental spectrum of 151 states up to excitation energies of
$6.20$ MeV recently identified at the Maier-Leibnitz-Laboratorium at Garching,
Germany. For natural parity states the results are very close to the
predictions of Random Matrix Theory (RMT) for the nearest-neighbor spacing
distribution. A quantitative estimate of the agreement is given by the Brody
parameter $omega$, which takes the value $omega=0$ for regular systems and
$omega simeq 1$ for chaotic systems. We obtain $omega=0.85 pm 0.02$ which
is, to our knowledge, the closest value to chaos ever observed in experimental
bound states of nuclei. By contrast, the results for unnatural parity states
are far from RMT behavior. We interpret these results as a consequence of the
strength of the residual interaction in $^{208}$Pb, which, according to
experimental data, is much stronger for natural than for unnatural parity
states. In addition our results show that chaotic and non-chaotic nuclear
states coexist in the same energy region of the spectrum. | Source: | arXiv, 1605.0210 | Services: | Forum | Review | PDF | Favorites |
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