title: A striking nitrogen isotope anomaly in the bencubbin and weatherford meteorites.
abstract: The stony-iron meteorites Bencubbin and Weatherford contain nitrogen with a ratio of nitrogen-15 to nitrogen-14 larger than normal by as much as a factor of 2. The excess nitrogen-15 may be due either to a nucleosynthetic origin or to extreme isotopic fractionation. In the former case, it may reflect failure to homogenize nitrogen-15 produced in nova explosions. In the latter case, it may reflect chemical processing at temperatures below 40 K in a presolar molecular cloud.
authors.forename: C A
authors.initials: CA
authors.lastname: Prombo
authors.forename: R N
authors.initials: RN
authors.lastname: Clayton