New Analysis of Levels in $^{153}$Pr
ORAL
Abstract
Previous levels assigned to $^{153}$Pr [1] have recently been called into question and different transitions have been assigned to $^{153}$Pr [2]. Recently prompt gamma-rays in coincidence with isotopically-identified fission fragments using VAMOS$++$ and EXOGAM, produced using $^{238}$U on a $^{9}$Be target, at an energy around the Coulomb barrier have been reported [3]. We have combined the $\gamma -\gamma -\gamma -\gamma $ data from $^{252}$Cf (SF) and those from the in beam mass and Z-gated spectra to assign transitions and levels in $^{153}$Pr. In contrast to the recent work [2], the transitions and levels previously assigned to $^{153}$Pr have been confirmed by the M-Z gated spectra. As described in our other abstract, the levels assigned to $^{153}$Pr [2] are now assigned to $^{151}$Pr. The new evidences for the mass assignment to the transitions will be presented.\\[4pt] [1] J. K. Hwang \textit{et al.}, Phys. Rev. C~\textbf{82}, 034308 (2010)\\[0pt] [2] T. Malkiewicz \textit{et al.}, Phys. Rev. C~\textbf{85}, 044314 (2012)\\[0pt] [3] A. Navin et al. (submitted); A. Navin, 5th Int. Conf. on ``\textbf{\textit{Fission and properties of neutron-rich nuclei, Sanibel 2012}},'' World Scientific, in press.
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