One neutron transfer reaction spectroscopy of195Ptas a detailed test of theU(6/12)supersymmetry

Abstract

We investigated the nucleus ${}^{195}\mathrm{Pt}$ via $(p,d)$ and polarized $(\stackrel{\ensuremath{\rightarrow}}{d},t)$ one neutron pickup reactions. Rather complete spectra are obtained resulting in new spin assignments of 42 states in ${}^{195}\mathrm{Pt}$ and in information about spectroscopic transfer strengths for each level up to an excitation energy of 1450 keV. A $U(6/12)$ supersymmetric level scheme, describing with its five parameters the O(6) spectrum of ${}^{194}\mathrm{Pt}$ and the negative parity states of ${}^{195}\mathrm{Pt},$ reproduces these spectra. For the lower part of the spectrum also the transfer strengths, calculated with a semimicroscopic transfer operator, agree well with the experiment. The reproduction of the very rich data set improves and extends the evidence that the low-energy spectrum, which results from the coupling of the unpaired neutron in a few, specific orbits to the O(6) core, is determined in a rather complete way by supersymmetry.