RT Journal Article
T1 Examination of experimental evidence of chaos in the bound states of Pb-208
A1 Muñoz Muñoz, Laura
A1 Molina, R. A.
A1 Gómez, J. M. G.
A1 Heusler, A.
AB 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.
PB American Physical Society
SN 2469-9985
YR 2017
FD 2017-01-18
LK https://hdl.handle.net/20.500.14352/17784
UL https://hdl.handle.net/20.500.14352/17784
LA eng
NO ©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.
NO Ministerio de Ciencia e Innovación (MICINN)
NO Ministerio de Economía y Competitividad (MINECO)/FEDER
NO Comunidad de Madrid
DS Docta Complutense
RD 9 abr 2025