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Study of low-lying resonances in 26Si relevant for understanding the nucleosynthesis of Galactic 26Al
Presented By: Jesus Perello / jfperello@gmail.com / https://linkedin.com/in/jesus-perello
Jesus Perello is a graduate student working under Dr. Sergio Almaraz-Calderon at Florida State University. He conducts his research at the John D. Fox Superconducting Linear Accelerator Laboratory in FSU, where he focuses on nuclear reactions relevant for nuclear structure and nuclear astrophysics. To investigate these reactions, he works with stable and radioactive ion beams, thin targets, techniques for detecting neutrons using CATRiNA - an array of deuterated liquid scintillators that he characterized and developed, as well as detector systems which include neutron and gamma-ray coincidence. For his contributions to neutron detector development at FSU, he received the 2020 J.W. Endowment "For his enthusiastic attitude and willingness to share his knowledge in state-of-the-art neutron detectors and in helping his fellow graduate and undergraduate students at the John D. Fox Laboratory". He obtained his MSc in Physics at FSU and will complete his doctoral studies by the summer of 2021.
Abstract
The 25Al(p,γ)26Si reaction is critical in understanding the emission of radioactive 26Al in the Galaxy. The 25Al(p,γ)26Si reaction plays a crucial role in re-directing the flux of nuclear material away from the 26Alg, observable via its 1.8 MeV gamma-ray line, in favor of its short-lived isomeric state 26Alm, which bypasses the gamma-ray emission but it is measured in, for example, isotopic abundances of 26Mg in meteorites. Uncertainties in the 25Al(p,γ)26Si reaction are dominated by the nuclear properties of low-lying proton-unbound states in 26Si, which determine the reaction rate in a range of astrophysically relevant conditions. A high-sensitivity spectroscopy study of 26Si was performed at Florida State University using a neutron/gamma-ray (n/γ) coincidence measurement of the 24Mg(3He,n/γ) reaction. The experiment was carried out at the John D. Fox laboratory at FSU using the newly developed CATRiNA neutron detector system, an array of 16 deuterated liquid scintillators with excellent pulse-shape-discrimination capabilities as well as a structured pulse-height spectrum that allows to perform neutron spectroscopy complementary to the traditional time-of-flight technique. States in 26Si are ‘tagged’ by the CATRiNA neutron detectors while the subsequent γ-rays are measured using the FSU HPGe Clovers detectors. Results of this measurement will be discussed as well as its astrophysical implications. Download AbstractHosted By
University of Notre Dame