Abstract
As we enter the age of precision measurement in neutrino physics, improved flux sources are required. These must have a well defined flavor content with energies in ranges where backgrounds are low and cross-section knowledge is high. Very few sources of neutrinos can meet these requirements. However, pion/muon and isotope decay-at-rest sources qualify. The ideal drivers for decay-at-rest sources are cyclotron accelerators, which are compact and relatively inexpensive. This paper describes a scheme to produce decay-at-rest sources driven by such cyclotrons, developed within the DAEδALUS program. Examples of the value of the high precision beams for pursuing Beyond Standard Model interactions are reviewed. New results on a combined DAEδALUS—Hyper-K search for CP violation that achieve errors on the mixing matrix parameter of 4° to 12° are presented.
Highlights
As we reach the 100th anniversary of the birth of Bruno Pontecorvo, neutrino physics is facing a transition
An isotope DAR source produces a pure electron flavor flux through β-decay. Such a source can be produced through high-intensity, low-energy (60 MeV/n) protons impinging on a beryllium target
This paper describes schemes to produce isotope and pion/muon decay-at-rest sources, developed as a part of the DAEδALUS program
Summary
As we reach the 100th anniversary of the birth of Bruno Pontecorvo, neutrino physics is facing a transition. The three known neutrino flavors mix within three mass states. Our route to precision drives us to high-intensity sources coupled with ultralarge detectors Even at this relatively early stage, the ]SM has been remarkably predictive. It is unclear if the neutrinos are oriented in this “normal hierarchy” (m1 < m2 < m3), as shown, or if the orientation is “inverted” (m3 < m1 < m2). If history is any indicator of the future, it is quite likely that these experiments, along with the more conventional ones within the ]SM, will raise even more surprises
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