arXiv · 2003.11572
Structure of high-lying levels populated in the $^{96}$Y $\rightarrow ^{96}$Zr $\beta$ decay
Abstract
The nature of $J^{\pi}=1^-$ levels of $^{96}$Zr below the $\beta$-decay $Q_{\beta}$ value of $^{96}$Y has been investigated in high-resolution $\gamma$-ray spectroscopy following the $\beta$ decay as well as in a campaign of inelastic photon scattering experiments. Branching ratios extracted from $\beta$ decay 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 $1^-$ levels below the $Q_{\beta}$ value, which are investigated in the theoretical approach of the Quasiparticle Phonon Model. This study clarifies the nuclear structure properties associated with the enhanced population of high-lying levels in the $^{96}$Y$_{gs}$ $\beta$ decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum.
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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. Chisthi, U. Friman-Gayer, L. P. Gaffney, P. E. Garrett, E. T. Gregor, J. M. Keatings, U. Köster, B. Löher, A. D. McLean, 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. 2020-03-25. Structure of high-lying levels populated in the $^{96}$Y $\rightarrow ^{96}$Zr $\beta$ decay. https://doi.org/10.1016/j.physletb.2021.136569
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