Is the generalized Brink-Axel hypothesis valid?

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

Is the generalized Brink-Axel hypothesis valid?

Nuclear Experiment 2017-01-26 v1

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

Abstract

Experimental results of the $^{237}$ Np( $d, p \gamma)^{238}$ Np reaction are presented, which verifies the generalized Brink-Axel (gBA) hypothesis for $\gamma$ transitions between states in the quasi-continuum. The gBA hypothesis holds not only for specific collective resonances, but for the full dipole strength below the neutron separation energy. We discuss the validity of the gBA hypothesis also for lighter systems like $^{92}$ Zr where the concept of a unique $\gamma$ -ray strength function ( $\gamma$ SF) is problematic due to large Porter-Thomas fluctuations. Methods for studying the $\gamma$ SF and the fluctuations as function of excitation energy are presented.

Cite

@article{arxiv.1701.07317,
  title  = {Is the generalized Brink-Axel hypothesis valid?},
  author = {M. Guttormsen and A. C. Larsen and A. Görgen and T. Renstrøm and S. Siem and T. G. Tornyi and G. M. Tveten},
  journal= {arXiv preprint arXiv:1701.07317},
  year   = {2017}
}

Comments

8 pages, 4 figures, PoS proceedings for The 26th International Physics Conference 11-16 September, 2016, Adelaide, Australia

Is the generalized Brink-Axel hypothesis valid?

Abstract

Cite

Comments

Related papers