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Examination of experimental evidence of chaos in the bound states of Pb-208

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Muñoz Muñoz, Laura and Molina, R. A. and Gómez, J. M. G. and Heusler, A. (2017) Examination of experimental evidence of chaos in the bound states of Pb-208. Physical review C, 95 (1). ISSN 2469-9985

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Official URL: http://dx.doi.org/10.1103/PhysRevC.95.014317


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https://journals.aps.org/Publisher


Abstract

We study the spectral fluctuations of the Pb-208 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 similar or equal to 1 for chaotic systems. We obtain omega = 0.85 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 Pb-208, which, according to experimental data, is much stronger for natural than for unnatural parity states. In addition, our results show that chaotic and nonchaotic nuclear states coexist in the same energy region of the spectrum.


Item Type:Article
Additional Information:

©2017 American Physical Society.
This research was conducted with support of Spanish Ministry of Science and Innovation Grants No. FIS2012-35316 and No. FIS2012-34479, MINECO/FEDER Grant No. FIS2015-63770-P, and CAM research consortium QUITEMAD+ S2013/ICE-2801.

Uncontrolled Keywords:Fluctuation properties; Energy levels; Distributions; Spectrum; Physics
Subjects:Sciences > Physics > Nuclear physics
ID Code:42523
Deposited On:08 May 2017 08:28
Last Modified:10 Dec 2018 14:57

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