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#### The role of nuclear physics in supernovae and the evolution of neutron stars, Neutrino Opacities, Equation of State, Transport Coefficients, and Dark Matter Production

A massive star, of at least eight solar masses, end their life cycle in a sudden, catastrophic collapse under its own gravity. In a thousandth of a second, it can shrink from thousands of kilometers across to a ball of ultra-condensed matter just a few kilometers across. Ultimately, it all ends in a cataclysmic explosion known ...

#### Developments for a measurement of the beta-nu correlation and determination of the recoil charge state distribution in 6He beta decay

The beta-nu of a pure Gamow-Teller beta decay such as the 6He decay is sensitive to tensor-type weak currents predicted by theories beyond the Standard Model. An experiment is developed at University of Washington aiming at measuring the coefficient a_{beta-nu} of 6He decays to the 0.1% level and looking for its deviation ...

#### Statistical Angles on the Lattice QCD Signal-to-Noise Problem

The theory of quantum chromodynamics (QCD) encodes the strong interactions that bind quarks and gluons into nucleons and that bind nucleons into nuclei. Predictive control of QCD would allow nuclear structure and reactions as well as properties of supernovae and neutron stars to be theoretically studied from first principles. ...

#### Reduced Limit on the Permanent Electric Dipole Moment of 199 Hg

This thesis describes an experiment to measure the permanent electric dipole moment (EDM) of 199Hg. The EDM is manifested as a small perturbation to the Larmor precession frequency due to the interaction energy of the electric dipole with a static electric field. The atoms are prepared in four separate glass vapor cells using ...

#### Surface Alpha Interactions in P-Type Point-Contact HPGe Detectors: Maximizing Sensitivity of 76Ge Neutrinoless Double-Beta Decay Searches

Though the existence of neutrino oscillations proves that neutrinos must have non-zero mass, Beyond-the-Standard-Model physics is needed to explain the origins of that mass. One intriguing possibility is that neutrinos are Majorana particles, i.e., they are their own anti-particles. Such a mechanism could naturally explain ...

#### Investigation of Background from the Inter-Spectrometer Penning Trap and Secondary Electron Emission in the KATRIN Experiment

The KATRIN experiment aims to determine the neutrino mass with unprecedented precision by measuring the tritium $\beta$-decay spectrum with a tandem of MAC-E-filter spectrometers. The background rate measured at the $\beta$-detector is a crucial parameter affecting the sensitivity of the experiment. The detector energy ...

#### MuSun: A Precision Measurement of Nuclear Muon Capture in Deuterium with a Cryogenic Time Projection Chamber

The MuSun experiment aims to measure the muon capture rate on deuterium to 1.5\%, allowing for the extraction of a low energy constant required to quantify the axial two body current in the framework of modern effective field theories. Once obtained, this constant calibrates the two nucleon sector, enabling calculations of ...

#### Fission dynamics in a microscopic theory

This thesis is concerned with the application of the time-dependent density functional theory (TDDFT) to investigate the fission dynamics of atomic nucleus, which is still one of the most complicated problem in nuclear physics and a full microscopic interpretation is still missing. The establishment of the time-dependent ...

#### A measurement of the $e$-$\bar{\nu_e}$ angular correlation coefficient in the decay of $^6$He

A measurement of the beta-neutrino angular correlation coefficient $a_{\beta\nu}$ in the pure Gamow-Teller $\beta^-$ decay of $^6$He has been performed to the level of $2.2\%$ in order to search for exotic tensor-type interaction terms in the electro-weak sector of the Standard Model. The experiment involves the production ...

#### The Search for Double-Beta Decay to Excited States in 76-Ge using the MAJORANA DEMONSTRATOR

The discovery of neutrino mass is the first tangible contradiction of the Standard Model of particle physics. Two neutrino double-beta decay (2νββ) is an allowed second order process in the Standard Model that has been observed with half-lives in the range of 10^18 − 10^24 y. Because it involves two neutrino vertices, double-beta ...