Structure of high-lying levels populated in the 96
Zr β decay
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.
Mashtakov, KR; Ponomarev, VY; Scheck, M; Finch, SW; Isaak, J; Zweidinger, M; Agar, O; Bathia, C; Beck, T; Beller, J; Bowry, M; Chapman, R; Chishti, MMR; Friman-Gayer, U; Gaffney, LP; Garrett, PE; Gregor, ET; Keatings, JM; Köster, U; Löher, B; MacLean, AD; O'Donnell, D; Pai, H; Pietralla, N; Rainovski, G; Ramdhane, M; Romig, C; Rusev, G; Savran, D; Simpson, GS; Sinclair, J; Sonnabend, K; Spagnoletti, P; Tonchev, AP; Tornow, W
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