A search for gamma-ray lines from the decay of Fe-59 in Supernova 1987A

Details A search for gamma-ray lines from the decay of Fe-59 in Supernova 1987A A search for gamma-ray lines from the decay of Fe-59 in Supernova 1987A

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..766h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 3, p. 766-770

Astronomy and Astrophysics

Astronomy

2

Gamma Ray Astronomy, Gamma Ray Spectra, Iron 59, Line Spectra, Magellanic Clouds, Radioactive Decay, Spaceborne Astronomy, Supernova 1987A, Astronomical Spectroscopy, Gamma Ray Spectrometers, Solar Maximum Mission

Scientific paper

We have searched spectra of Supernova (SN) 1987A, accumulated during several 35-day intervals after the explosion by the Solar Maximum Mission (SMM) Gamma Ray Spectrometer (GRS), for gamma-ray lines at 1.099 and 1.292 MeV from the decay of Fe-59 which may have been produced in the progenitor's helium shell. We find no evidence for these lines, down to 3-sigma upper limits approximately = 7 x 10-4 gamma/sq cm/s for the 1.099 MeV line, or approximately = 4.5 x 10-4 gamma/sq cm/s for the 1.292 MeV line, in any 35-day interval. We derive a conservative 3-sigma upper limit on the mass fraction of Fe-59 in the helium shell of 2.9 x 10-3.

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