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The particle and nuclear astrophysics initiative explores fundamental physics through astronomical phenomena. Key research areas encompass Solar Neutrinos, WIMP Dark Matter investigations, Neutrino-less Double Beta Decay, and Ultra-High Energy Neutrino detection. Solar Neutrinos: Princeton plays a leading role in the Borexino Solar Neutrino Experiment (link is external) at Gran Sasso Laboratory. (link is external) This project utilizes 1300 tons of highly purified liquid scintillator, uniquely positioned to conduct pioneering measurements of low-energy solar neutrinos (7Be and pep neutrinos). These findings will help validate unconfirmed aspects of neutrino oscillations while providing crucial insights into solar physics and stellar evolution theories. WIMP Dark Matter Research: Compelling evidence indicates approximately 30% of the universe consists of cold dark matter, yet its composition remains unknown. The leading hypothesis suggests Weakly Interacting Massive Particles (WIMPs) that decoupled during the universe's early formation. Predicted by supersymmetry theories, these particles would permeate our galaxy and could potentially be detected on Earth. Princeton contributes significantly to DarkSide, a WIMP detection initiative at Gran Sasso Laboratory. Particle and Nuclear Astrophysics tackles profound scientific questions through compact research teams, offering exceptional opportunities for both undergraduate and graduate students to engage in instrument development and data interpretation.