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An iron-free P spectrometer with preand post-acceleration of electrons was used to study P branches and conversion electrons at very low energies in the P decay of Ra. Results of conversionelectron and p-ray spectroscopy are analyzed using P selection rules and two-quasiparticle-rotor model considerations. A tentative Ac level scheme, including model-dependent spin-parity and configuration assignments consistent with the available data, is presented.PACS number(s): 27.90.+b, 21.60.Ev, 23.40.Hc

The "'W(t, a ) "Y'a reaction has been studied using 17 MeV tritons with a polarization of P= 0.78 from the Los Alamos tandem Van de Graaff accelerator facility. The reaction products were momentum analyzed with a Q3D magnetic spectrometer and detected with a helical-cathode position-sensitive proportional counter. No nuclear structure information is available in the literature for the neutron rich IssTa isotope. A comparison of the measured angular distributions for the (t, a ) reaction with DWBA predictions permitted spin and parity assignments for some levels. Rotational bands have been assigned for the 7/2+[404], 9/2-[514], 1/2+[411], and 7/2-[523] orbitals, and a tentative suggestion is given for thelocation of the 3/2+[411] orbital.

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