Measurement of the 6He Decay Produced by the 9Be(n,α)6He Reaction
The OMEGA laser at LLE is routinely used to implode gasfilled capsules to study light ion fusion reaction rates of interest to stellar nucleosynthesis. As a first step toward a possible measurement of the 3H(t,γ)6He radiative capture reaction, a detector system capable of measuring the 807 ms half-life of 6He has been developed and is being tested using 6He nuclei produced via the 9Be(n,α)6He reaction. Deuterons from the SUNY Geneseo tandem Pelletron produce neutrons in a thick deuterated polyethylene target via the 2H(d,n)3He reaction. These neutrons are allowed to strike a beryllium target placed in front of a silicon dE-E detector telescope, which is used to identify the β particles from 6He decay. Following an approximately five second long activation period, the beryllium sample is immediately counted for about five seconds. The pulse heights for each detector and the timestamp are recorded using a specially configured femtoDAQ acquisition system and used to measure the decay curve. Funded in part by a grant from the DOE through the Laboratory for Laser Energetics.
Omega Laser User’s Group Meeting, Laboratory for Laser Energetics, Rochester, NY, April 26, 2017; XXXVI Annual Rochester Symposium for Physics Students, University of Rochester, Rochester, NY., April 1, 2017; 58th Annual Meeting of the APS Division of Plasma Physics, San Jose, CA, Oct. 31 – Nov. 4, 2016, 2016 APS Division of Plasma Physics Outstanding Undergraduate Poster Award, 2017 Omega Laser Facility Users Group Workshop Student Poster Award.
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