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- n. A radioactive isotope of nitrogen, 137N, having seven protons and six neutrons, and a half-life of less than ten minutes; it is used in positron emission tomography
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The pair's plan for identifying this altered temperature distribution relies on detecting neutrinos that are generated by a number of different fusion reactions within the Sun. The crucial point is that different reactions take place at different distances from the centre of the Sun - the reaction producing boron-8, for example, takes place at just 4% of the solar radius whereas that involving the production of nitrogen-13 occurs at 16% of the solar radius.