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The IsoDAR Experiment

IsoDAR, an ISOtope Decay-At-Rest experiment, will form the first stage of the phased DAEδALUS (Decay-At-rest-Experiment for δcp studies At the Laboratory for Underground Science) experiment that will ultimately search for evidence of CP violation in the neutrino sector. Utilizing the injector cyclotron setup being devised for DAEδALUS, IsoDAR will be paired with a ~ 1 kton scintillator-based detector and used to search for physics beyond the standard model. These searches will focus around three areas.

First, IsoDAR will produce an electron antineutrino flux of sufficient intensity to form a conclusive test of sterile neutrino oscillation models using the L/E dependence of inverse beta decay events. Secondly, the number of electron antineutrino-electron scatter events will be an order of magnitude greater than any previous experiment, enabling purely leptonic precision tests of the standard model to be made. Finally, IsoDAR will also permit searches for the production and decay of exotic particles in the detector, allowing for further investigation of physics beyond the standard model.


In brief, the design consists of an ion source which sends 5mA of H2+ into a high-power compact cyclotron. These ions are accelerated to energies of 60 MeV/amu before being dissociated into their proton constituents as they leave the accelerator. As H2+ consists of two protons and one electron, the dissociated beam will deliver 10mA of protons onto a 9Be target immersed in D2O, producing a high neutron flux. These neutrons will then enter a sleeve surrounding the target, which is made from 99.99% pure 7Li. The interactions here will create radioactive isotopes, including large quantities of 8Li, which will then beta decay producing the electron antineutrinos required for our experiment. Several sites are being considered for this experiment, among them KamLAND, in the Kamioka mine in Japan.


Our Latest Work on IsoDAR

  • Work with Larry Bartoszek, of Bartoszek Engineering, on the target design.
  • Regular meetings betwen MIT, INFN, and BEST cyclotrons to discuss planning execution of an IsoDAR central region test, which will be held at BEST, Inc. in Vancouver this summer (see image of our beam, above!).
  • Productive meetings at ERICE to discuss the way forward for a Baseline Design Report
  • Writing a paper on the phenomenology of electron antineutrino-electron scatters with IsoDAR.

Further Reading

  • Cost-Effective Design Options for IsoDAR ArXiv
  • Proposal for an Electron Antineutrino Disappearnace Search Using High-Rate 8Li production and Decay on ArXiv and also chosen as a PRL Highlight