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

DOE DOE logo

NSF NSF logo

Heising-Simons Foundation HSF logo

ONR ONR logo

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

We are presently operating the EXO-200 double-beta decay experiment at the WIPP underground site in southern New Mexico. This is one of the largest and more sophisticated experiments presently searching 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 and, possibly, establish the neutrino mass scale. A short article in Physics World explains the search for neutrinoless double beta decay.

Within the broader EXO program we are developing new methods to extend the sensitivity of a future multi-ton experiment, nEXO. This work has two major divisions, the first involves the extraction and identification (tagging) of the Ba atom produced in the double-beta decay of Xe using AMO techniques. The second is developing and testing new components and technologies for the nEXO detector to improve the charge and light readout; this includes work with silicon photomultipliers and modular pads for charge readout. A new setup has just been built to characterize the performance of such devices in Liquid Xenon.

We have started a new program to investigate the nature of gravity at length scales near 1 micron. This work uses ~5 micron diameter silica spheres, which are optically trapped and manipulated in vacuum using lasers. Monitoring the motion of these spheres as they are positioned near gravitational attractors allows us to search for new forces that may appear at micron distances.

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
SLAC office Bldg 40, Rm 210A (650) 926-2698
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
Alex Rider Postdoc Varian 134 (650) 723-7828 arider@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
Mike Jewell Graduate Student Varian 128A (650) 723-4612 mjjewell@stanford.edu
Denzal Martin Graduate Student Varian 132 (650) 723-2946 domartin@stanford.edu
George Halal Graduate Student Varian (650) 723-2946 georgech@stanford.edu
Brandon Sandoval Undergraduate Student Varian 132 (650) 723-2946 bransand@stanford.edu
Rita Tlemcani Undergraduate Student Varian (650) 723-2946 ritabt@stanford.edu
Emmett Hough Undergraduate Student Varian (650) 723-2946 emhough@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