PMH40 How do Patients Describe Their Depression? - Incorporating the Patient's Voice Into Instrument Development

Letter from CGIAR Chairman Ismail Serageldin to CGIAR heads of delegation, board chairs, center directors and the TAC chairman and secretariat, leading up to ICW94. Serageldin described the work of various ad hoc and standing bodies in preparation for International Centers Week 1994 and the Ministerial-level Meeting being planned for early 1995. He also announced that as a result of additional funding by donors and matching funds from the World Bank, the 1994 core program was fully funded

Superdeformed bands in 189Tl

Two superdeformed bands of 10 transitions each have been found in 189Tl extending the mass 190 region of superdeformation down to neutron number N5108. The new bands can be interpreted as signature partners and are proposed to be based on a proton i13/2 (V55/2) configuration, in analogy with the yrast superdeformed band structures in the heavier odd-mass Tl isotopes. The dynamic moments of inertia of all these bands show no noticeable differences as function of N, consistent with an essentially constant quadrupole deformation from the center of the island to its edges

Level structures of 96,97,98Ru at high angular momentum

The high-spin level structures of 96,97,98Ru (Z544) have been investigated using the 65Cu(36S, pxn)96,97,98Ru (x54,3,2) reactions. About 130 new transitions have been observed and unambiguously placed in the decay schemes of these nuclei. The level schemes have been extended up to spin J'22– 34\, and excitation energies Ex'20224 MeV. Spherical shell model calculations have been performed and theoretical level energies compared with experimental values. Calculations using 88Sr as the core give a reasonable agreement for the observed energy levels up to J16\), possibly manifesting vibrational behavior

Level structure of 94,95,96Tc at high spins and shell-model calculations

High-spin states in the 94,95,96Tc (N = 51, 52, and 53) nuclei have been investigated using the 65Cu+H36S reaction at a beam energy of 142 MeV. More than 60 new transitions have been identified and placed in their level schemes, which now extend up to spin J ≈ 22ℏ and excitation energies Ex ≈ 12 MeV. Spherical shell-model calculations have been performed using different model spaces. A restricted model space, using 88Sr as the core and the π(p 1/2,g9/2) ν(d5/2,s1/2) valence orbitals, reproduces the experimental excitation energies up to J ≈ 14ℏ. The higher-angular-momentum states are dominated by the excitation of a g9/2 neutron across the N = 50 magic core, as indicated by large-basis shell model calculations

Nuclear structure of 94,95Mo at high spins

The high-spin level structures of 94,95Mo (N552,53) have been investigated via the 65Cu(36S, a p2n)94Mo and 65Cu(36S, a pn)95Mo reactions at 142 MeV. The level schemes have been extended up to spin J'19\ and excitation energies Ex'12 MeV. Spherical shell-model calculations have been performed and compared with the experimental energy levels. The level structure of 94Mo exhibits a single-particle nature and the higher-angular-momentum states are dominated by the excitation of a g9/2 neutron across the N550 shell gap. The level sequences observed in 95Mo have been interpreted on the basis of the spherical shell model and weak coupling of a d5/2 or a g7/2 neutron to the 94Mo core

High-spin states in 97,98Rh

High-spin states in 97,98Rh (Z545) were populated via the 65Cu( 36S,xn)97,98Rh (x54,3) fusion-evaporation reactions. More than 40 additional transitions have been identified and placed in the decay schemes of these nuclei. The level scheme of 97Rh has been extended up to tentative spins of Jp 539/21,37/22, and the placement of some of the previously known transitions has been revised. The level structure of 97Rh indicates a single-particle nature and the observed levels are reproduced well by spherical shell-model calculations. The level scheme of 98Rh has been extended up to spins J;20\ and up to an excitation energy of ;10 MeV. The low-spin structure of 98Rh (J<10\), appears to indicate also a singleparticle structure, as supported by the stretched coupling scheme @ 97Rh(J8)^n (d5/2)598Rh (J)#

Alignment additivity in the two-quasiparticle superdeformed bands of 192Tl

Four superdeformed bands have been confirmed in 192Tl. Two of these bands have script T sign(2) dynamic moments of inertia which are nearly constant with rotational frequency ℏω. The other two bands show the characteristic rise of script T sign(2) with increasing ℏω seen in most superdeformed bands of the A = 190 region of superdeformation. From comparisons with the odd-A neighbors, it was found that the alignments of these bands relative to a 192Hg core can be accounted for from the additive contributions of the assigned quasiproton and quasineutron orbitals

Structure of high-spin states in 91Sr and 92Sr

The nuclei 91Sr and 92Sr were produced at high spin as fission fragments following the fusion reaction 36S+ 159Tb at 165 MeV. γ rays were detected with the Gammasphere array. The level schemes of 91Sr and 92Sr were extended up to E≈6 MeV and E≈8 MeV, respectively. Level structures in 91Sr and 92Sr were interpreted in shell-model calculations performed in the configuration space (0f5/2, 1p3/2, 1p1/2, 0g9/2) for the protons and (1p1/2, 0g9/2, 1d5/2) for the neutrons. Negative-parity states in the yrast sequences are described in these calculations by coupling 3- proton excitations to the unpaired 1d5/2 neutrons. A possible reduction of the gap between the proton 1p3/2 and 1p1/2 orbitals in 92Sr is discussed

Superdeformation and prolate-oblate competition in Tl nuclei

Spectroscopic studies of weakly populated proton i13/2 bands in superdeformed Tl nuclei (around mass 190) and in the normally deformed, very light 183Tl nucleus are discussed. Among the results presented, the first measurement of a superdeformed quadrupole moment in an odd-Z nucleus, 191Tl, is reported. The experiments were conducted with the Gammasphere array as "stand-alone" device and coupled with the Argonne Fragment Mass Analyzer