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Probing r-Process Production of Nuclei Beyond Bi209 with Gamma Rays | | Y.-Z. Qian
; P. Vogel
; G. J. Wasserburg
; | | Date: |
29 May 1999 | | Journal: | Astrophys.J. 524 (1999) 213-219 | | Subject: | astro-ph nucl-th | | Affiliation: | LANL), P. Vogel (Caltech), G. J. Wasserburg (Caltech | | Abstract: | We estimate gamma-ray fluxes due to the decay of nuclei beyond Bi209 from a supernova or a supernova remnant assuming that the r-process occurs in supernovae. We find that a detector with a sensitivity of about 10**(-7) photons/cm**2/s at energies of 40 keV to 3 MeV may detect fluxes due to the decay of Ra226, Th229, Am241, Am243, Cf249, and Cf251 in the newly discovered supernova remnant near Vela. In addition, such a detector may detect fluxes due to the decay of Ac227 and Ra228 produced in a future supernova at a distance of about 1 kpc. As nuclei with mass numbers A > 209 are produced solely by the r-process, such detections are the best proof for a supernova r-process site. Further, they provide the most direct information on yields of progenitor nuclei with A > 209 at r-process freeze-out. Finally, detection of fluxes due to the decay of r-process nuclei over a range of masses from a supernova or a supernova remnant provides the opportunity to compare yields in a single supernova event with the solar r-process abundance pattern. | | Source: | arXiv, astro-ph/9905387 | | Services: | Forum | Review | PDF | Favorites | |
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