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DTSTART;TZID=America/Los_Angeles:20200529T120000
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SUMMARY:VIRTUAL INPA SEMINAR – Luca Pagani (UC Davis)
DESCRIPTION:Speaker: Luca Pagani (UC Davis) \nTitle: Recent results from the ACED and the ARTIE experiments \nAbstract: \nLiquid argon is becoming a popular medium for particle detection\, with applications ranging from low-background dark matter searches to high-energy neutrino detection. Because neutrons represent both an important source of background (e.g.\, for dark matter experiments) and a product of signal events (e.g.\, neutrino-induced spallation neutrons)\, a good understanding of their interactions in argon is a requirement for precision physics measurements. Despite being one of the most basic quantities needed to describe low-energy neutron transport\, the neutron cross section on argon is not clearly understood. In particular\, the existing activation measurements for the thermal neutron capture cross section show significant disagreements. Moreover\, in the energy range 40-70 keV theory predicts an anti-resonance in the $^{40}$Ar cross section near $57$\\,keV\, but the existing data\, coming from an experiment performed in the 90s (Winters. et al.)\, does not support this. To resolve these disagreements\, two experiments were performed using a time of flight neutron beam at Los Alamos National Laboratory. The Argon Capture Experiment at DANCE (ACED) first measured the differential cross section of $^{40}$Ar$(n\,\gamma)^{41}$Ar using the Detector for Advanced Neutron Capture Experiments (DANCE)\, a $\sim$4$\pi$ gamma spectrometer. A fit to the differential cross section from $0.015-0.15$\\,eV\, assuming a $1/v$ energy dependence\, yields $\sigma^{2200} = 673 \pm 26 \text{ (stat.)} \pm 59 \text{(sys.)}$\\,mb. Then\, the Argon Resonance Transmission Interaction Experiment (ARTIE) measured the transmission coefficient for neutrons through a thick ($\sim 3$\\,atoms/b) liquid natural argon target in the energy range 40-70 keV. This measurements are crucial for the Deep Underground Neutrino Experiment (DUNE) since allow a viable means of calibration and a deeper understanding of signals and backgrounds for the low energy science program. \nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/97119161552 \nMeeting ID: 971 1916 1552
URL:https://inpa.lbl.gov/event/virtual-inpa-seminar-luca-pagani-uc-davis/
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