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Things that go bump in the sea T. Sloan (Lancaster University)

Things that go bump in the sea T. Sloan (Lancaster University). Neutrino interactions (>10 20 eV) Axions (sadly Cotton-Mouton term) Primordial black holes Any other unexpected phenomenon. Expected pulse shapes. Backgrounds give a train of osillations.

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Things that go bump in the sea T. Sloan (Lancaster University)

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  1. Things that go bump in the seaT. Sloan (Lancaster University) • Neutrino interactions (>1020 eV) • Axions (sadly Cotton-Mouton term) • Primordial black holes • Any other unexpected phenomenon.

  2. Expected pulse shapes Backgrounds give a train of osillations.

  3. Limits from array using 4 fold coincidence of hydrophones (from Simon Bevan UCL Thesis)

  4. Increase sensitivity - give up coincidence requirement • Increases the solid angle coverage since showers detectable outside the plane of the array. • More noise – ask for bigger pulses

  5. Raw spectrum of peak amplitudes APPLY CUTS Final spectrum for 2 weeks of data. Analyse all 245 days of data selecting triggers with peak pressure above 0.4 Pa.

  6. Examine all data (245 days) • 81 events survive with peak pressure above 0.4 Pa. • Each scanned visually to look for bipolar pulses. • Most of them are multiple oscillations.

  7. Conclusions • 2 events (inverted probably background). • No neutrinos (limit 5 orders of magnitude above W-B). Sensible limits need very large targets e.g. moon or polar ice cap (ANITA). • No axions • No primordial blackholes. • No other unexpected phenomena.

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