Project 8 marks a major milestone in its quest to measure neutrino mass. The humble neutrino, an elusive subatomic particle that passes effortlessly through normal matter, plays an outsized role among the particles that comprise our universe. To fully explain how our universe came to be, we need to
Researchers from Project 8 employ a pioneering technique, Cyclotron Radiation Emission Spectroscopy, in their ambitious endeavor to determine the elusive neutrino’s mass, holding potential implications for our understanding of the universe.Long-Term Benadryl Doubles Risk of Memory LossThe humble neutrino, an elusive subatomic particle that passes effortlessly through normal matter, plays an outsized role among the particles that comprise our universe.
The ultimate success of Project 8 hinges on an ambitious plan. Rather than try to detect the neutrino—which effortlessly passes through most detector technology—the research team has instead gone after a simple measurement strategy that can be summarized as follows:equals the energy of its parts, thanks to Einstein. When we measure a free electron generated by beta decay, and we know the total mass, the “missing” energy is the neutrino mass and motion.
Project 8 relies on just such a technique, one conceived over a decade ago by physicists Joe Formaggio and Ben Monreal, then working at Massachusetts Institute of Technology. An international team rallied around the idea and formed Project 8 to convert the vision into a practical tool. The resulting method is called Cyclotron Radiation Emission Spectroscopy . It captures the microwave radiation emitted from newborn electrons as they spiral around in a magnetic field.
In their most recent experiment, built at the University of Washington in Seattle, the team tracked 3,770 tritium beta decay events over an 82-day trial window in a sample cell the size of a single pea. The sample cell is cryogenically cooled and placed in a magnetic field that traps the emerging electrons long enough for the system’s recording antennas to register a microwave signal.
This technology advance, and scaling up the whole apparatus, will be the critical steps to reaching and ultimately exceeding the sensitivity achieved by the KATRIN team.
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