سمینار مشترک گروه  ذرات ، کیهان شناسی  و  مرکز پژوهشی فیزیک انرژی ­های بالا

Ali Ashtari Esfahani

Department of Physics, Sharif University of Technology

Neutrino Mass in the Crosshairs 

 

Abstract: The absolute scale of the neutrino mass plays a critical role in physics at every scale, from the subatomic to the cosmological. Measurements of the tritium endpoint spectrum have provided the most precise direct limit on the neutrino mass scale. In this talk, we present advances by Project 8 to the Cyclotron Radiation Emission Spectroscopy (CRES) technique culminating in the first frequency-based neutrino mass limit. With only a cm^3-scale physical detection volume, a limit of  m_\beta< 155  eV/c^2 (152 eV/c^2  ) is extracted from the background-free measurement of the continuous tritium beta spectrum in a Bayesian (frequentist) analysis. Using 83mKr calibration data, a resolution of 1.66 \pm 0.19 eV (FWHM) is measured, the detector response model is validated, and the efficiency is characterized over the multi-keV tritium analysis window. These measurements establish the potential of CRES for a high-sensitivity next-generation direct neutrino mass experiment featuring low background and high resolution.

 

 

یکشنبه 9 مهر 1402، ساعت 17:00

Sunday 1 October 2023 – 17:00 Tehran Time

Hybrid Seminar

دانشکده فیزیک – طبقه اول – کلاس فیزیک 1 / Physics Department – first floor – Room Physics 1

https://vc.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest