Welcome to Neutrino Physics
at Stanford University

dancing neutrinos


Search for Neutrinoless Double Beta Decay

Levitated Microspheres

Detector R&D Detector R&D

Our Sponsors

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Heising-Simons Foundation

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Grad student rotations available!

Over the last 15 years our group has been central to many developments in the field of neutrino physics. Click here for more of our group history

In recent times, this interest has been focused on searches for neutrinoless double beta decay. The discovery of such a decay would establish the existence of 2-component Majorana Fermions (mundane Fermions, like the electron, are 4-component Dirac particles), demonstrate the violation of the lepton number conservation and, possibly, establish the neutrino mass scale. A short article in Physics World explains the search for neutrinoless double beta decay.

The data taking of the EXO-200 experiment was completed in Dec 2018. This was the first “100kg class” experiment to start taking data and produced some of the most advanced results in the world. We recently published the final neutrinoless double beta decay search with this detector, but data analysis for other topics is still ongoing, specifically in our group.

As the work on EXO-200 is winding down, we are aggressively pursuing the finalization of the design of nEXO, a 5-tonne detector that we hope will become the flagship experiment in this area. Our group is very active in a number of areas of nEXO R&D, including the optimization of charge collection devices, the integration of Silicon Photomultipliers with charge readout, high voltage and detector calibration. We operate a liquid Xenon system at Stanford, with a new, larger one under construction.

In the last several years we have also started a program to develop new measurements in the area of fundamental physics using optically levitated microspheres. This work started from our interest in testing the inverse square law of gravity below 50 micron distance but more recently evolved into other measurements, down to the quantum regime.

We also have a program to develop novel radiation detectors for application to science, homeland security and medical physics.

We have openings for new graduate students in (almost) all of the projects above.


Name Position Office Phone E-mail
Giorgio Gratta Professor Varian 146 (650) 725-6509 gratta@stanford.edu
Sha Zhang Adm. Assistant Varian 148 (650) 723-2314 shazhang@stanford.edu
Ralph DeVoe Consulting Professor Varian 128B (650) 723-6342 rgdevoe@stanford.edu
Alex Fieguth Postdoc Varian 132 (650) 725-2946 afieguth@stanford.edu
Akio Kawasaki Postdoc Varian 136 (650) 725-2342 akiok@stanford.edu
Brian Lenardo Postdoc Varian 132 (650) 725-2946 blenardo@stanford.edu
Gaosong Li Postdoc Varian 128B (650) 723-6342 ligs@stanford.edu
Nadav Priel Postdoc Varian 128A (650) 723-4612 nadavp@stanford.edu
Shuoxing Wu Postdoc Varian 132 (650) 725-2946 sxwu@stanford.edu
Chas Blakemore Graduate Student Varian 134 (650) 723-7828 cblakemore@stanford.edu
Jacopo Dalmasson Graduate Student Varian 136 (650) 725-2342 jdalmass@stanford.edu
Denzal Martin Graduate Student Varian 134 (650) 723-7828 domartin@stanford.edu
Clarke Alistair Hardy Graduate Student Varian 132 (650) 723-2946 cahardy@stanford.edu
Emmett Hough Undergraduate Student Varian 132 (650) 723-2946 emhough@stanford.edu
Zhaoyi Li Undergraduate Student Varian 132 (650) 723-2946 ladmon@stanford.edu
Aspen Stuart_Cunningham Undergraduate Student Varian 132 (650) 723-2946 aspensc@stanford.edu
Kevin Wells Visitor from the theory group at Stanford Varian 136 (650) 725-2342 kcwells@stanford.edu

Group mailing list : grattagroup@lists.stanford.edu

Group Wiki

Completed Projects

KamLAND (completed) KamLand experiment logo

SAUND (completed) SAUND experiment logo

Palo Verde (completed) Palo Verde experiment logo

Group Photos





Site maintenance: Sha Zhang.
Design: Giulio Gratta