Structure of high-lying levels populated in the 96Y →96Zr β decay

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. LöherA.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

*Corresponding author for this work

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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.

Original languageEnglish
Article number136569
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Early online date5 Aug 2021
Publication statusPublished - 10 Sept 2021


  • high resolution gamma-ray spectroscopy
  • pygmy dipole resonance
  • quasi-particle phonon model
  • reactor antineutrino anomaly


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