Positron Annihilation on Polycyclic Aromatic Hydrocarbon molecules in the Interstellar Medium (2009)
Guessoum, N., Jean, P., Gillard, W.
We examine the annihilation of positrons on polycyclic aromatic hydrocarbon (PAH) molecules in interstellar medium conditions. We estimate the annihilation rates of positrons on PAHs by a...
Positron transport in the interstellar medium (2009)
Jean, P., Gillard, W., Marcowith, A., Ferrière, K.
We seek to understand the propagation mechanisms of positrons in the interstellar medium (ISM). This understanding is a key to determine whether the spatial distribution of the annihilation emission...
The PAMELA Space Experiment (2009)
Mocchiutti, E., Adriani, O., Barbarino, G. C., Bazilevskaya, G. A., Bellotti, R., Boezio, M., ...
The 15th of June 2006, the PAMELA satellite-borne experiment was launched from the Baikonur cosmodrome and it has been collecting data since July 2006. The apparatus comprises a time-of-flight...
The all-sky distribution of 511 keV electron-positron annihilation emission (2007)
Knödlseder, J., Jean, P., Lonjou, V., Weidenspointner, G., Guessoum, N., Gillard, W., ...
We present a map of 511 keV electron-positron annihilation emission, based on data accumulated with the SPI spectrometer aboard ESA's INTEGRAL gamma-ray observatory, that covers approximately 95% of...
Transport of positrons in the interstellar medium (2007)
Gillard, W., Jean, P., Marcowith, A., Ferriere, K.
This work investigates some aspects of the transport of low-energy positrons in the interstellar medium (ISM). We consider resonance interactions with magnetohydrodynamic waves above the resonance...
Effects of the gas content on the gamma-ray emission from the galactic bulge (2007)
Gillard, W., Lonjou, V., Ferrière, K., Jean, P., Moskalenko, I. V., Strong, A.
Weidenspointner, G., Shrader, C. R., Knoedlseder, J., Jean, P., Lonjou, V., Guessoum, N., ...
We present a measurement of the sky distribution of positronium (Ps) annihilation continuum emission obtained with the SPI spectrometer on board ESA's INTEGRAL observatory. The only sky region from...
Spectral analysis of the Galactic e+e- annihilation emission (2005)
Jean, P., Knodlseder, J., Gillard, W., Guessoum, N., Ferriere, K., Marcowith, A., ...
We present a spectral analysis of the e+e- annihilation emission from the Galactic Centre region based on the first year of measurements made with the spectrometer SPI of the INTEGRAL mission. We...
The all-sky distribution of 511 keV electron-positron annihilation emission (2005)
Knödlseder, J., Jean, P., Lonjou, V., Weidenspointner, G., Guessoum, N., Gillard, W., ...
We present a map of 511 keV electron-positron annihilation emission, based on data accumulated with the SPI spectrometer aboard ESA's INTEGRAL gamma-ray observatory, that covers approximately 95% of...
The lives and deaths of positrons in the interstellar medium (2005)
Guessoum, N., Jean, P., Gillard, W.
We reexamine in detail the various processes undergone by positrons in the ISM from their birth to their annihilation using the most recent results of positron interaction cross sections with H, H2...