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Investigating the spectral statistics of 31- levels using random matrix theory in the odd–odd nuclei.

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Title: Investigating the spectral statistics of 31- levels using random matrix theory in the odd–odd nuclei.
Authors: Sayedi, M1 (AUTHOR) m.sayedi@ilam.ac.ir, Sabri, H2 (AUTHOR)
Source: Pramana: Journal of Physics. Sep2025, Vol. 99 Issue 3, p1-9. 9p.
Subjects: Random matrices, Nuclear shell theory, Quadrupoles, Half-life (Nuclear physics), Spectrum analysis, Atomic nucleus, Particle decays
Abstract: In this paper, the spectral statistics of all the observed 3 1 - levels in the odd–odd nuclei have been analysed in the framework of random matrix theory. Also, the possible effects of the shell model configurations, mass regions, theoretical quadrupole deformation, experimental half-lives and major decay modes on the statistical situations related to negative parity states have been studied. In order to prepare different sequences, we have used the latest available empirical data on the 10 ≤ A ≤ 250 mass region for 216 nuclei. Using the maximum likelihood estimation technique, the parameter of the Berry–Robnik distribution function in different sequences has been extracted and the statistical situation of these sequences in comparison with regular and chaotic limits is described. Our results show the maximum chaoticity for these odd–odd nuclei in 100 < A < 150 mass region, short-lived nuclei. These odd–odd nuclei have the maximum theoretical quadrupole deformations. Also, there are some suggestions on the effect of shell model configuration and decay modes on the statistical situation of these negative parity states in odd–odd nuclei. [ABSTRACT FROM AUTHOR]
Copyright of Pramana: Journal of Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: In this paper, the spectral statistics of all the observed 3 1 - levels in the odd–odd nuclei have been analysed in the framework of random matrix theory. Also, the possible effects of the shell model configurations, mass regions, theoretical quadrupole deformation, experimental half-lives and major decay modes on the statistical situations related to negative parity states have been studied. In order to prepare different sequences, we have used the latest available empirical data on the 10 ≤ A ≤ 250 mass region for 216 nuclei. Using the maximum likelihood estimation technique, the parameter of the Berry–Robnik distribution function in different sequences has been extracted and the statistical situation of these sequences in comparison with regular and chaotic limits is described. Our results show the maximum chaoticity for these odd–odd nuclei in 100 &lt; A &lt; 150 mass region, short-lived nuclei. These odd–odd nuclei have the maximum theoretical quadrupole deformations. Also, there are some suggestions on the effect of shell model configuration and decay modes on the statistical situation of these negative parity states in odd–odd nuclei. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Pramana: Journal of Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Type: general
      – SubjectFull: Nuclear shell theory
        Type: general
      – SubjectFull: Quadrupoles
        Type: general
      – SubjectFull: Half-life (Nuclear physics)
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      – SubjectFull: Spectrum analysis
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      – SubjectFull: Atomic nucleus
        Type: general
      – SubjectFull: Particle decays
        Type: general
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      – TitleFull: Investigating the spectral statistics of 31- levels using random matrix theory in the odd–odd nuclei.
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              M: 09
              Text: Sep2025
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              Y: 2025
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