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Proposal: A Search for Sterile Neutrino at J-PARC Materials and Life Science Experimental Facility | | M.Harada
; S.Hasegawa
; Y.Kasugai
; S.Meigo
; K.Sakai
; S.Sakamoto
; K.Suzuya
; E.Iwai
; T.Maruyama
; K.Nishikawa
; R.Ohta
; M.Niiyama
; S.Ajimura
; T.Hiraiwa
; T.Nakano
; M.Nomachi
; T.Shima
; T.J.C.Bezerra
; E.Chauveau
; T.Enomoto
; H.Furuta
; H.Sakai
; F.Suekane
; M.Yeh
; G.T.Garvey
; W.C.Louis
; G.B.Mills
; R.Van de Water
; | | Date: |
5 Oct 2013 | | Abstract: | We propose a definite search for sterile neutrinos at the J-PARC Materials
and Life Science Experimental Facility (MLF). With the 3 GeV Rapid Cycling
Synchrotron (RCS) and spallation neutron target, an intense neutrino beam from
muon decay at rest (DAR) is available. Neutrinos come from mu+ decay, and the
oscillation to be searched for is (anti
u mu -> anti
u e) which is
detected by the inverse eta decay interaction (anti
u e + p -> e+ + n),
followed by a gamma from neutron capture.
The unique features of the proposed experiment, compared with the LSND and
experiments using horn focused beams, are;
(1) The pulsed beam with about 600 ns spill width from J-PARC RCS and muon
long lifetime allow us to select neutrinos from mu DAR only.
(2) Due to nuclear absorption of pi- and mu-, neutrinos from mu- decay are
suppressed to about the $10^{-3}$ level.
(3) Neutrino cross sections are well known. The inverse eta decay cross
section is known to be a few percent accuracy.
(4) The neutrino energy can be calculated from positron energy by adding ~1.8
MeV.
(5) The anti
u mu and
u e fluxes have different and well defined
spectra. 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 region
of Delta m^2 to be searched can be anywhere between sub-eV^2 to several tens
of eV^2. We start to examine the large Delta m^2 region, which can be done
with short baseline at first. At close distance to the MLF target gives a high
neutrino flux, and allows us to use relatively small detector.
If no definitive positive signal is found, a future option exists to cover
small Delta m^2 region. This needs a relatively long baseline and requires a
large detector to compensate for the reduced neutrino flux. | | Source: | arXiv, 1310.1437 | | Services: | Forum | Review | PDF | Favorites | |
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