Papers › Modeling emission of acoustic energy during bubble expansion in PICO bubble chambers
Modeling emission of acoustic energy during bubble expansion in PICO bubble chambers
Tetiana Kozynets, Scott Fallows, Carsten B. Krauss
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The PICO experiment uses bubble chambers filled with superheated C₃F₈ for spin-dependent WIMP dark matter searches. One of the main sources of background in these detectors is alpha particles from decays of environmental ²²²Rn, which nucleate bubbles that are visually indistinguishable from WIMP candidate events. Alpha-induced bubbles can be discriminated acoustically, because the signal from alpha events is consistently larger in magnitude than that from nuclear recoil/WIMP-like events. By studying the dynamics of bubbles nucleated by these two types of ionizing radiation from the first stages of their growth, we present a physical model for the acoustic discrimination for the first time. The distribution of acoustic energies that we generate for a simulated sample of bubble nucleations by alpha particles and nuclear recoils is compared directly to the experimental data.
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