Present Topics of Research:  Meson meson and meson baryon interaction in chiral unitary theories.  Chiral approach to the nucleon nucleon interaction  Elementary reactions with production of two pions.   Interaction of mesons with nuclei Photon and electron interactions with nuclei Modification of resonance properties in nuclei. Exotic atoms: pionic, kaonic, sigma atoms.... Decay of Hypernuclei.  Neutrino interactions with hadrons and nuclei   Collaborations with other groups   Laboratori Nationale Frascati, Italia   Forschungzentrum Juelich, Germany   Technische Universitaet Muechen, Germany   University of Tubingen, Germany   University of Torino, Italy   University of Barcelona, Spain   University of Granada, Spain   Research Center for Nuclear Physics, Osaka, Japan   Nara Women's University, Nara, Japan    Academia Sinica, Beijing, China   Joint Institute for Nuclear Research, Dubna, Russia   Institute for Theoretical and Experimental Physics, Moscow, Russia   Thomas Jefferson Lab, Virginia, U.S.A   University of Mainz, Germany   Tokyo Institute of Technology, Tokyo, Japan        Past long-term visitors   Prof. Rolf Brockmann, Mainz U., 1981   Dr. Ma Wei Hsing, Academica Sinica, 1981-82   Prof. Hiroshi Toki, RCNP, 1983, 2000   Prof. Yasuhico Futami, Tokyo Science U., 1984   Dr. Chiang Huan Ching, Academia Sinica, 1990, 1996-97   Prof. Shri Krishna Singh, Aligarh Muslim U., 1992, 1996   Dr. Michail Khankhasayev, Joint Institute for Nuclear Research, Dubna, 1992   Prof. Haiduke Sarafian, Pennsylvanya State U., 1992   Prof. Gerry Brown, State University of New York at Story Brook, 1992   Dr. Yu Ratis, Samara Aviation Institute, 1993   Dr. George Vagradov, Moscow Institute for Nuclear Research, 1993   Dr. Sarira Sahu, Institute of Physics Bubaneswar, 1994-95   Prof. Karl Holinde, Kernforschungszentrum, Juelich, 1994-95   Dr. Marios Kagarlis, Niels Born Institute, 1994   Prof. T.H.S. Kosmas, Joannina, 1994   Dr. Arturo de Pace, Torino, 1995   Dr. Satoru Hirenzaki, Nara Women's U., 1995, 1999 and 2000   Dr. Sabit Kamalov, JINR, Dubna, 1996, 2000   Dra. Neelima Kelkar, Bhabha Atomic Research Center, Bombay, 1996   Dr. Boris Krippa, Nuclear Research Lab., Moscow, 1997   Dr. T.S.H. Lee, Argonne National Laboratory, 1997-98   Dra. Anna Krutenkova, ITEP, 1998   Prof. Nimai Mukhopadhyay, 1997   Prof. Atsushi Hosaka, Numazu College of Technology, 1999