58907079
A Quantum Sensor for Neutrino Mass Measurements
There are few experiments aiming at determining directly the mass of the electron antineutrino with 
a sensitivity of 0.2 eV by analyzing the end of the -decay spectrum of specific nuclei. This 
sensitivity can be only reached if the uncertainties arising from systematic effects are very small and very well determined. The same holds for experiments aiming at improving the sensitivity in the determination of the mass of the electron neutrino using electron-capture ()-decaying nuclei. One important input in these cases is an accurate Q-value of the decay which 
can be unambiguously determined from the difference of the mass of the mother and the daughter 
nuclei by means of Penning traps. In order to reach the required sensitivity, a novel device called Quantum Sensor is under construction at the University of Granada (Spain). The device will allow measuring atomic masses, and therefore Q-values from decays with unprecedented accuracy and 
sensitivity, using fluorescence photons from a laser-cooled ion instead of electronic detection. This 
paper will give an overview on Q-value measurements performed with Penning traps, relevant for 
neutrino mass spectrometry, describing the Quantum Sensor and the facility under construction. It 
will end by presenting the status of the project.
119973016
A quantum sensor for applications in neutrino mass spectrometry
The most-suited instrument for high-accuracy mass and therefore for high-accuracy Q-value determinations is the Penning trap. However, the most-advanced type of Penning trap mass spectrometer up to date needs a drastic improvement in order to contribute from a Q-value measurement to the mass determination of the electron antineutrino at the level of 10−12 as pursued by the international MARE collaboration measuring the end-point of the decay 187Re to 187Os. In this contribution, a novel device, called quantum sensor, is proposed to measure the mass of a single ion with ultimate accuracy and unprecedented sensitivity while it is stored and cooled in a trap. The quantum sensor is made of a reference ion suspended in vacuum by the electric and magnetic field of a Penning trap, and laser cooled to very low temperatures. By wiring this ion with the ion of interest, the mass of the later can be determined from its cyclotron frequency using the fluorescence of the reference ion. This paper will present the appli...
118529809
The Ultra-High Energy Cosmic Ray Spectrum Measured by the Telescope Array's Middle Drum Detector
The Telescope Array's Middle Drum fluorescence detector was constructed using refurbished telescopes from the High Resolution Fly's Eye (HiRes) experiment. As such, there is a direct comparison between these two experiments' fluorescence energy spectra. An energy spectrum has been calculated based on one year of collected data by the Middle Drum site of Telescope Array and agrees well with the HiRes monocular spectra. The quality of the Middle Drum results has also been determined to show good agreement.