Deviations from the Porter-Thomas Distribution due to Nonstatistical γ Decay below the 150Nd Neutron Separation Threshold

O. Papst; J. Isaak; V. Werner; D. Savran; N. Pietralla; G. Battaglia; T. Beck; M. Beuschlein; S. W. Finch; U. Friman-Gayer; K. E. Ide; R. V. F. Janssens; M. D. Jones; J. Kleemann; B. Löher; M. Scheck; M. Spieker; W. Tornow; R. Zidarova; A. Zilges

doi:10.1103/n6zw-zhz2

Deviations from the Porter-Thomas Distribution due to Nonstatistical γ Decay below the ¹⁵⁰Nd Neutron Separation Threshold

O. Papst^*, J. Isaak, V. Werner, D. Savran, N. Pietralla, G. Battaglia, T. Beck, M. Beuschlein, S. W. Finch, U. Friman-Gayer, K. E. Ide, R. V. F. Janssens, M. D. Jones, J. Kleemann, B. Löher, M. Scheck, M. Spieker, W. Tornow, R. Zidarova, A. Zilges

^*Corresponding author for this work

School of Computing, Engineering and Physical Sciences

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Abstract

We introduce a new method for the study of fluctuations of partial transition widths based on nuclear resonance fluorescence experiments with quasimonochromatic linearly polarized photon beams below particle separation thresholds. It is based on the average branching of decays of 𝐽 =1 states of an even-even nucleus to the 2⁺₁ state in comparison to the ground state. Between 5 and 7 MeV, a constant average branching ratio for 𝛾 decays from 1⁻ states of 0.490(16) is observed for the nuclide ¹⁵⁰Nd . Assuming 𝜒²-distributed partial transition widths, this average branching ratio is related to a degree of freedom of 𝜈=1.93⁢(12), rejecting the validity of the Porter-Thomas distribution, requiring 𝜈 =1. The observed deviation can be explained by nonstatistical effects in the 𝛾-decay behavior with contributions in the range of 9.4(10)% up to 94(10)%.

Original language	English
Article number	052501
Number of pages	8
Journal	Physical Review Letters
Volume	135
DOIs	https://doi.org/10.1103/n6zw-zhz2
Publication status	Published - 30 Jul 2025

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2025 05 20 Papst et al Porter finalFinal published version, 447 KBLicence: CC BY 4.0

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Papst, O., Isaak, J., Werner, V., Savran, D., Pietralla, N., Battaglia, G., Beck, T., Beuschlein, M., Finch, S. W., Friman-Gayer, U., Ide, K. E., Janssens, R. V. F., Jones, M. D., Kleemann, J., Löher, B., Scheck, M., Spieker, M., Tornow, W., Zidarova, R., & Zilges, A. (2025). Deviations from the Porter-Thomas Distribution due to Nonstatistical γ Decay below the ¹⁵⁰Nd Neutron Separation Threshold. Physical Review Letters, 135, Article 052501. https://doi.org/10.1103/n6zw-zhz2

@article{1efe2f0157b54088b5af556ed9f53025,

title = "Deviations from the Porter-Thomas Distribution due to Nonstatistical γ Decay below the 150Nd Neutron Separation Threshold",

abstract = "We introduce a new method for the study of fluctuations of partial transition widths based on nuclear resonance fluorescence experiments with quasimonochromatic linearly polarized photon beams below particle separation thresholds. It is based on the average branching of decays of 𝐽 =1 states of an even-even nucleus to the 2+1 state in comparison to the ground state. Between 5 and 7 MeV, a constant average branching ratio for 𝛾 decays from 1− states of 0.490(16) is observed for the nuclide 150Nd . Assuming 𝜒2-distributed partial transition widths, this average branching ratio is related to a degree of freedom of 𝜈=1.93⁢(12), rejecting the validity of the Porter-Thomas distribution, requiring 𝜈 =1. The observed deviation can be explained by nonstatistical effects in the 𝛾-decay behavior with contributions in the range of 9.4(10)\% up to 94(10)\%.",

author = "O. Papst and J. Isaak and V. Werner and D. Savran and N. Pietralla and G. Battaglia and T. Beck and M. Beuschlein and Finch, \{S. W.\} and U. Friman-Gayer and Ide, \{K. E.\} and Janssens, \{R. V. F.\} and Jones, \{M. D.\} and J. Kleemann and B. L{\"o}her and M. Scheck and M. Spieker and W. Tornow and R. Zidarova and A. Zilges",

year = "2025",

month = jul,

day = "30",

doi = "10.1103/n6zw-zhz2",

language = "English",

volume = "135",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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Papst, O, Isaak, J, Werner, V, Savran, D, Pietralla, N, Battaglia, G, Beck, T, Beuschlein, M, Finch, SW, Friman-Gayer, U, Ide, KE, Janssens, RVF, Jones, MD, Kleemann, J, Löher, B, Scheck, M, Spieker, M, Tornow, W, Zidarova, R & Zilges, A 2025, 'Deviations from the Porter-Thomas Distribution due to Nonstatistical γ Decay below the ¹⁵⁰Nd Neutron Separation Threshold', Physical Review Letters, vol. 135, 052501. https://doi.org/10.1103/n6zw-zhz2

TY - JOUR

T1 - Deviations from the Porter-Thomas Distribution due to Nonstatistical γ Decay below the 150Nd Neutron Separation Threshold

AU - Papst, O.

AU - Isaak, J.

AU - Werner, V.

AU - Savran, D.

AU - Pietralla, N.

AU - Battaglia, G.

AU - Beck, T.

AU - Beuschlein, M.

AU - Finch, S. W.

AU - Friman-Gayer, U.

AU - Ide, K. E.

AU - Janssens, R. V. F.

AU - Jones, M. D.

AU - Kleemann, J.

AU - Löher, B.

AU - Scheck, M.

AU - Spieker, M.

AU - Tornow, W.

AU - Zidarova, R.

AU - Zilges, A.

PY - 2025/7/30

Y1 - 2025/7/30

N2 - We introduce a new method for the study of fluctuations of partial transition widths based on nuclear resonance fluorescence experiments with quasimonochromatic linearly polarized photon beams below particle separation thresholds. It is based on the average branching of decays of 𝐽 =1 states of an even-even nucleus to the 2+1 state in comparison to the ground state. Between 5 and 7 MeV, a constant average branching ratio for 𝛾 decays from 1− states of 0.490(16) is observed for the nuclide 150Nd . Assuming 𝜒2-distributed partial transition widths, this average branching ratio is related to a degree of freedom of 𝜈=1.93⁢(12), rejecting the validity of the Porter-Thomas distribution, requiring 𝜈 =1. The observed deviation can be explained by nonstatistical effects in the 𝛾-decay behavior with contributions in the range of 9.4(10)% up to 94(10)%.

AB - We introduce a new method for the study of fluctuations of partial transition widths based on nuclear resonance fluorescence experiments with quasimonochromatic linearly polarized photon beams below particle separation thresholds. It is based on the average branching of decays of 𝐽 =1 states of an even-even nucleus to the 2+1 state in comparison to the ground state. Between 5 and 7 MeV, a constant average branching ratio for 𝛾 decays from 1− states of 0.490(16) is observed for the nuclide 150Nd . Assuming 𝜒2-distributed partial transition widths, this average branching ratio is related to a degree of freedom of 𝜈=1.93⁢(12), rejecting the validity of the Porter-Thomas distribution, requiring 𝜈 =1. The observed deviation can be explained by nonstatistical effects in the 𝛾-decay behavior with contributions in the range of 9.4(10)% up to 94(10)%.

U2 - 10.1103/n6zw-zhz2

DO - 10.1103/n6zw-zhz2

M3 - Article

SN - 0031-9007

VL - 135

JO - Physical Review Letters

JF - Physical Review Letters

M1 - 052501

ER -

Deviations from the Porter-Thomas Distribution due to Nonstatistical γ Decay below the 150Nd Neutron Separation Threshold

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Deviations from the Porter-Thomas Distribution due to Nonstatistical γ Decay below the ¹⁵⁰Nd Neutron Separation Threshold