Research program on Single-Bubble Sonoluminescence (SBSL) 1.History and overview of SBSL 2.Research organization and focus 3.Present status and future plans Nanjing University and Academic Sinica, TEXONO Lu Jia Qi

Overview of SBSL Discovered in 1989 by Felipe Gaitan. Energy focus factor: from sound to light Pulse width is about 100ps High temperature in the bubble 25 000 K Underlying physics is not very clear.

D-D fusion in the bubble R. P. Taleyarkhan et al Science March 8, 2002 Evidence for Nuclear Emissions During Acoustic Cavitation tritium decay activity and neutron emission High temperature: K Is it true?

Research focus To understand underlying physics Use event-by-event “HEP style” studies to detect detailed distributions (rather than just average) To study possible high energy radiation Use advanced detector, electronics and analysis techniques to detect neutrons, photons, x-ray andγ-ray

Our collaboration Academic Sinica (AS), TEXONO group physics, coordination, data acquisition and data analysis China Institute of Atomic Energy (CIAE) neutron detection Nanjing University (NU) electronics support National Tsing Hua University (NTHU) laser techniques

Summary of present status Produce stable SBSL in water at AS. Set up version 1 DAQ and analysis. Work on parameter monitor and control: 1. temperature 2. concentration of air 3. acoustic pressure Work on SBSL in organic liquid for detection x-ray

Our setup

PAW output

SL intensity with time

Future plans To set up multi-channel detector and DAQ SBSL in water (heavy water) and organic liquid with scintillator materials at AS. to detect neutron and x-ray Repeat Taleyarkhan’s experiment at CIAE. to confirm the D-D Fusion in SL Applications of laser techniques to SBSL at NTHU to measure bubble dynamics, pulse width etc.