학술논문
Structure of high-lying levels populated in the 96Y →96Zr β decay
Document Type
article
Author
K.R. Mashtakov; V.Yu. Ponomarev; M. Scheck; S.W. Finch; J. Isaak; M. Zweidinger; O. Agar; C. Bathia; T. Beck; J. Beller; M. Bowry; R. Chapman; M.M.R. Chishti; U. Friman-Gayer; L.P. Gaffney; P.E. Garrett; E.T. Gregor; J.M. Keatings; U. Köster; B. Löher; A.D. MacLean; D. O'Donnell; H. Pai; N. Pietralla; G. Rainovski; M. Ramdhane; C. Romig; G. Rusev; D. Savran; G.S. Simpson; J. Sinclair; K. Sonnabend; P. Spagnoletti; A.P. Tonchev; W. Tornow
Source
Physics Letters B, Vol 820, Iss , Pp 136569- (2021)
Subject
Language
English
ISSN
0370-2693
Abstract
The nature of the high-lying final levels of the 96Ygs β decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum, has been investigated in high-resolution γ-ray spectroscopy following the β decay as well as in a campaign of inelastic photon scattering experiments. The comprehensive approach establishes 1− levels associated with the Pygmy Dipole Resonance as high-lying final levels in the β decay. Branching ratios extracted from β decay complement photon scattering and allow the absolute E1 excitation strength to be determined for levels populated in both reactions. The combined data represents a comprehensive approach to the wavefunction of the 1− levels below the Qβ value, which are investigated in the Quasiparticle Phonon Model. The calculations reveal that the components populated in β decay contribute only with small amplitudes to the complex wavefunction of these 1− levels. A comparison of the β decay results to data from total absorption γ-ray spectroscopy demonstrates a good agreement between both measurements.