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Guttormsen M, Larsen AC, Görgen A, et al. Validity of the Generalized Brink-Axel Hypothesis in (238)Np. Phys Rev Lett. 2016;116(1):012502doi: 10.1103/PhysRevLett.116.012502.
Guttormsen, M., Larsen, A. C., Görgen, A., Renstrøm, T., Siem, S., Tornyi, T. G., & Tveten, G. M. (2016). Validity of the Generalized Brink-Axel Hypothesis in (238)Np. Physical review letters, 116(1), 012502. https://doi.org/10.1103/PhysRevLett.116.012502
Guttormsen, M, et al. "Validity of the Generalized Brink-Axel Hypothesis in (238)Np." Physical review letters vol. 116,1 (2016): 012502. doi: https://doi.org/10.1103/PhysRevLett.116.012502
Guttormsen M, Larsen AC, Görgen A, Renstrøm T, Siem S, Tornyi TG, Tveten GM. Validity of the Generalized Brink-Axel Hypothesis in (238)Np. Phys Rev Lett. 2016 Jan 08;116(1):012502. doi: 10.1103/PhysRevLett.116.012502. Epub 2016 Jan 08. PMID: 26799014.
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Phys Rev Lett. 2016 Jan 08;116(1):012502. doi: 10.1103/PhysRevLett.116.012502. Epub 2016 Jan 08.

Validity of the Generalized Brink-Axel Hypothesis in (238)Np.

Physical review letters

M Guttormsen, A C Larsen, A Görgen, T Renstrøm, S Siem, T G Tornyi, G M Tveten

Affiliations

  1. Department of Physics, University of Oslo, N-0316 Oslo, Norway.

PMID: 26799014 DOI: 10.1103/PhysRevLett.116.012502

Abstract

We analyze primary γ-ray spectra of the odd-odd (238)Np nucleus extracted from (237)Np(d,pγ)(238)Np coincidence data measured at the Oslo Cyclotron Laboratory. The primary γ spectra cover an excitation-energy region of 0≤E(I)≤5.4  MeV, and allow us to perform a detailed study of the γ-ray strength as a function of excitation energy. Hence, we can test the validity of the generalized Brink-Axel hypothesis, which, in its strictest form, claims no excitation-energy dependence on the γ strength. In this work, using the available high-quality (238)Np data, we show that the γ-ray strength function is to a very large extent independent of the initial and final states. Thus, for the first time, the generalized Brink-Axel hypothesis is experimentally verified for γ transitions between states in the quasicontinuum region, not only for specific collective resonances, but also for the full strength below the neutron separation energy. Based on our findings, the necessary criteria for the generalized Brink-Axel hypothesis to be fulfilled are outlined.

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