Other
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.3604t&link_type=abstract
American Astronomical Society, HEAD meeting #12, #36.04
Other
Scientific paper
Many science themes would greatly benefit from increased sensitivity in the soft gamma-ray domain. Observation of the light curve and the profile of the 847 keV line from the decay chain of 56Ni synthesized in Type Ia supernovae would place severe constraints on the physical processes at work during these events. This is also true for the observation of the 478 keV line originating in the decay of 7Be synthesized in CO classical novae. In both cases, theoretical models are ready but need observational constraints. In addition, sensitive observations of the 511 keV electron-positron annihilation line would bring new constraints on the origin of the positrons from the Galactic bulge. High significance detection also opens the way for polarization analysis, which is especially interesting in the hard X-ray tails of compact objects. Despite improvements in sensitivity at essentially every other wavelength, the soft gamma-ray domain is lagging behind. Our group at UC Berkeley has been developing a Laue lens: an optic based on diffraction in crystals that enables the concentration of a couple of relatively narrow energy bands in the range from 100 keV to 1.5 MeV. Laue lens telescopes hold the promise of providing at least an order of magnitude improvement in sensitivity with respect to existing instruments, enabling much of the science cited above.
Barrière Nicolas
Boggs Sam
Tomsick John
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