Gómez Gómez, José MaríaMolina, R. A.Relaño Pérez, ArmandoRetamosa Granado, Joaquín2023-06-202023-06-202002-091539-375510.1103/PhysRevE.66.036209https://hdl.handle.net/20.500.14352/59385©2002 The American Physical Society. We want to acknowledge useful discussions with D. Weinmann. This work was supported in part by Spanish Government grants for Research Project Nos. BFM2000-0600 and FTN2000-0963-C02.The main signature of chaos in a quantum system is provided by spectral statistical analysis of the nearest-neighbor spacing distribution P(s) and the spectral rigidity given by the Delta(3)(L) statistic. It is shown that some standard unfolding procedures, such as local unfolding and Gaussian broadening, lead to a spurious saturation of Delta(3)(L) that spoils the relationship of this statistic with the regular or chaotic motion of the system. This effect can also be misinterpreted as Berry's saturation.engjournal articlehttp://dx.doi.org/10.1103/PhysRevE.66.036209http://journals.aps.org/open access536Shell-modelTransitionSpectrumEnergyTermodinámica2213 Termodinámica