Observation of eta-mesic nuclei in photoreactions: results and perspectives

Recent results from the LPI experiment on searching for eta-mesic nuclei in photoreactions are discussed and further perspectives are summarized.Comment: 4 pages, 4 figures. Talk given by G.A.S. at NSTAR01, Mainz, German

Anomalous Spin Dynamics in Doped Quantum Antiferromagnets

Finite-temperature spin dynamics in planar t-J model is studied using the method based on the Lanczos diagonalization of small systems. Dynamical spin structure factor at moderate dopings shows the coexistence of free-fermion-like and spin-fluctuation timescales. At T<J, the low-frequency and static susceptibility show pronounced T dependence, supporting a scenario, related to the marginal Fermi-liquid one, for the explanation of neutron-scattering and NMR-relaxation experiments in cuprates. Calculated NMR relaxation rates reasonably reproduce experimental ones.Comment: 10 pages + 4 figures, Postscript in uuencoded compressed tar file, IJS-TP-94/2