Cross-Section Measurements on Radioactive Samples

Astronomy and Astrophysics – Astrophysics

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Nucleon-Induced Reactions, 6<=A<=19, 20<=A<=38, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

We have developed a system over the past few years at the Manuel Lujan, Jr. Neutron Scattering Center (LANSCE) for making (n,p) and (n,α) measurements on (mainly) radioactive nuclei. Measurements have included 7Be(n,p)7Li, 14N(n,p)14C, 17O(n,α)14C, 22Na(n,p)22Ne, 22Na(n,α)19F, 35Cl(n,p)35S and 36Cl(n,p)36S. The major basic physics motivation for these measurements has been the nuclear astrophysics to be learned. Currently, we are assembling a 4π detector of barium fluoride (BaF2) for making (n,γ) measurements on radioactive nuclei with relatively short half lives. Once operational, this new detector should allow us to expand our measurements to many more nuclei, and to a broader range of nuclear physics and nuclear astrophysics issues addressed. Results of recent measurements are given and future plans are discussed.

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