Excited states in 208 Pb have been studied by measuring ␥ rays in time coincidence with reaction charged particles. 208 Pb states were produced with both the 207 Pb(d, p) 208 Pb and 209 Bi(t,␣) 208 Pb reactions. The energy resolution of the particle spectra of 100 keV allowed a rough determination of level excitation, which then was determined with high resolution from the coincident ␥ decay measured in Ge detectors. Many new ␥ transitions have been found and previously unresolved multiplets of states resolved. The data give spectroscopic factors for neutron transfer and proton pickup. Spins and parities of levels could be deduced from their ␥ decays. A least squares fit of all ␥ energies gave very precise ͑0.1 keV͒ level energies. All states predicted by the shell model below 4.6 MeV are now found and their spins determined unambiguously. ͓S0556-2813͑97͒03009-4͔PACS number͑s͒: 21.60. Cs, 23.20.Lv, 25.45.Hi, 27.80.ϩw II. THE 209 Bi"t,␣␥… 208 Pb EXPERIMENT A. Design of the experiment and proceduresThe 209 Bi(t,␣␥) 208 Pb reaction was used to excite levels in 208 Pb. Due to the huge positive energy balance of this

The Hartree-Fock-Bogoliubov (HFB) equations with generalized isospin pairing are numerically solved without any approximations, except imposing certain self-consistent symmetries. Realistic forces are used to make definite conclusions concerning the shapes of nuclei and the existence of isospin pairing. Comparison with previous approximations shows that in the s-d shell the HFB equations may not be quantitatively approximated by HF+ BCS, HB -BCS, or by iterating between HF and BCS. Isospin pairing offers an explanation for axial symmetry in Mg and 'S and for the existence of low-lying vibrational states in Ar.

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The levels in 4 La have been studied following thermal-neutron capture in La using Ge(Li), Si(Li), curved-crystal, and coincidence spectrometers. The neutron binding energy of La was determined as 5161. 1 +1.0 keV. The data, when combined with the previous ' 9La-(d, p)" La study, allow the assignment of the first 14 states up to 581.060 keV to the mixed configurations kg»2 vfv&2 and md&&2vf7~2. The energies of states in keV (spin parity) are: 0 (3 ), 29.965 060 (0 ). Comparisons of p-ray branching ratios and (d, p) cross sections with the predictions of a quasiparticle model for odd-odd nuclei allow a relatively uncompromised solution for the state vectors for the first 14 states. The success of this model implies that there is little phonon or fourquasiparticle admixture through the level at 581.060 keV. A detailed experimental study of additional levels up to 1055 keV has been performed.

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The nuclear structure of '"Lu has been studied with the (t,u) reaction on an isotopically enriched target of '"Hf using a 17 MeV triton beam and a quadrupole-triple-dipole-type spectrometer. These measurements were combined with published (n, P), (n,e ), and (d,p) data to construct a level scheme for ' Lu. The Nilsson model including Coriolis coupling c'lculations has been used to interpret the level structure. The previously known Nilsson configurations 7/2+ f404] + 7/2 [514], 7/2+[404] -7/2 f514], 7/2+[404] -9/2+ f624], and 9/2 [514] -7/2 [514] with bandhead energies 0, 240.56, 198.01, and 342.48 keV, respectively, have been populated in the (t,a) reaction. Proposed new Nilsson configurations and bandhead energies are: 5/2+[402] -7/2 [514] at 390.21 keV, 9/2 [514] + 7/2 [514] at 485.7 keV, 5/2+[402] + 7/2 [514] at 563.89 keV, 1/2+[411] + 7/2 [514] at 726.51 keV, 1/2+ [411] -7/2 [514] at 838.36 keV, 7/2 [523] + 7/2 [514] at 1273 keV, and 3/2+ [411]+ 7/2 [514] at 1390.67 keV. The five new values of the singlet-triplet splitting energies and one new E = 0 odd-even shift observed in this study are compared with theory. NUCLEAR HEACTIONS Ne+ U, El b --400 MeV/nucleon fluid dynamics, viscosity, heat conduction, cross sections. 14.3 msr. The particles were detected with a 1m long, helical proportional counter mounted along the focal plane. ' Data were collected in 1024channel bites at angles of 15, 20, 25, 30, 35, 40', and 50'. The observed energy resolution was

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