English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We propose a definite search for sterile neutrinos at the J-PARC Materialsand Life Science Experimental Facility (MLF). With the 3 GeV Rapid CyclingSynchrotron (RCS) and spallation neutron target, an intense neutrino beam frommuon decay at rest (DAR) is available. Neutrinos come from \mu+ decay, and theoscillation to be searched for is (anti \nu \mu -> anti \nu e) which isdetected by the inverse \beta decay interaction (anti \nu e + p -> e+ + n),followed by a gamma from neutron capture.  The unique features of the proposed experiment, compared with the LSND andexperiments using horn focused beams, are;  (1) The pulsed beam with about 600 ns spill width from J-PARC RCS and muonlong lifetime allow us to select neutrinos from \mu DAR only.  (2) Due to nuclear absorption of \pi- and \mu-, neutrinos from \mu- decay aresuppressed to about the $10^{-3}$ level.  (3) Neutrino cross sections are well known. The inverse \beta decay crosssection is known to be a few percent accuracy.  (4) The neutrino energy can be calculated from positron energy by adding ~1.8MeV.  (5) The anti \nu \mu and \nu e fluxes have different and well definedspectra. This allows us to separate oscillated signals from those due to \mu-decay contamination.  We propose to proceed with the oscillation search in steps since the regionof \Delta m^2 to be searched can be anywhere between sub-eV^2 to several tensof eV^2. We start to examine the large \Delta m^2 region, which can be donewith short baseline at first. At close distance to the MLF target gives a highneutrino flux, and allows us to use relatively small detector.  If no definitive positive signal is found, a future option exists to coversmall \Delta m^2 region. This needs a relatively long baseline and requires alarge detector to compensate for the reduced neutrino flux.

Proposal: A Search for Sterile Neutrino at J-PARC Materials and Life Science Experimental Facility