Following the previous workshop organized in Toulouse in september 2010, this workshop aims to federate a french interdisciplinary community interested in the scientific objectives associated with the 0.1-100 MeV domain, by gathering high-energy astrophysicists, astroparticle and nuclear physicists, working on experimental, observational and theoretical aspects. It is supported by the PNHE.
Scientific Summary Over the last decade, the diversity and richness of the gamma-ray sky have been revealed through the joint exploitation of instruments onboard satellites such as INTEGRAL, Swift and Fermi in the soft and high energy domains, and ground-based experiments such as HESS, MAGIC and VERITAS in the very-high energy gamma-ray domain. Morphological, spectral and temporal analyses have now been made possible, and hence, confronted to multi-wavelength data in order to probe the underlying physical mechanisms of the observed sources, among them : gamma-ray bursts, novae, supernovae and their remnants, pulsars and their wind nebulae, accreting binary systems and active galactic nuclei, massive stars and stellar formation regions. However, one domain remains largely unexplored, namely the medium-energy gamma-ray (so-called "MeV") domain, from 0.1 to 100 MeV. Once the instruments onboard INTEGRAL are turned off, this energy range will be inaccessible to astronomers. Given the broad panel of scientific objectives associated with this MeV domain, federating beforehand an interdisciplinary community composed of high-energy astrophysicists, astroparticle and nuclear physicists, turns out to be an important step towards the design of the next dedicated gamma-ray mission. Meeting Program The workshop is mainly aimed to discuss the scientific perspectives associated with the MeV domain, and will be held at the APC institute in Paris. Researchers from various fields are therefore very welcome to participate. A large fraction of time will then be devoted to round-table discussions among the communities to discuss on various topics, such as: Anti-matter origin (511 keV line and positronium) Novae and SNe (56Ni, 22Ne, 7Be, 511 keV line from 13N and 18F) Radioactivities in the Galaxy (44Ti, 26Al, 60Fe) Low-energy Cosmic Rays Physical processes of matter under extreme conditions (PSR magnetospheres, neutron stars in binary systems, high-energy-emitting binaries) Physics of jets at all scales (AGNs, micro-quasars) Gamma-Ray Bursts Pulsar Wind Nebulae Supernova Remnants Earth-Sun system Fundamental & new physics (Lorentz invariance violation, Dark Matter) Organizing committee Matthieu Renaud, Alexandre Marcowith, Frédéric Piron (LUPM, Montpellier) François Lebrun, Régis Terrier, Philippe Laurent (APC, Paris) Vincent Tatischeff (CSNSM, Orsay) Peter von Ballmoos, Jürgen Knödlseder, Pierre Jean (IRAP, Toulouse) Bertrand Cordier, Stéphane Schanne (CEA/SAp, Saclay) Berrie Giebels, Denis Bernard (LLR, Palaiseau)