Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-12-18
Phys.Rev.C82:054610,2010
Physics
Nuclear Physics
Nuclear Experiment
Revised after feedback and further work on extrapolating cross sections to higher energies in order to estimate cosmic product
Scientific paper
10.1103/PhysRevC.82.054610
We measured the production of \nuc{57}{Co}, \nuc{54}{Mn}, \nuc{68}{Ge}, \nuc{65}{Zn}, and \nuc{60}{Co} in a sample of Ge enriched in isotope 76 due to high-energy neutron interactions. These isotopes, especially \nuc{68}{Ge}, are critical in understanding background in Ge detectors used for double-beta decay experiments. They are produced by cosmogenic-neutron interactions in the detectors while they reside on the Earth's surface. These production rates were measured at neutron energies of a few hundred MeV. We compared the measured production to that predicted by cross-section calculations based on CEM03.02. The cross section calculations over-predict our measurements by approximately a factor of three depending on isotope. We then use the measured cosmic-ray neutron flux, our measurements, and the CEM03.02 cross sections to predict the cosmogenic production rate of these isotopes. The uncertainty in extrapolating the cross section model to higher energies dominates the total uncertainty in the cosmogenic production rate.
Elliott Steven R.
Guiseppe Vincente E.
Johnson Rachel A.
LaRoque B. H.
Mashnik Stepan G.
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