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Detectors

Detectors. Liquid Ar TPC (~100kton). UNO (400kton Water Cherenkov). Far detector in second phase. limit to the size of large underground Water Cherenkov detectors will be given by the difficulties of excavation. Max width is about 50-60 meters.=> increase high&length. Phase-II: Hyper-K

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Detectors

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  1. Detectors Liquid Ar TPC (~100kton) UNO (400kton Water Cherenkov)

  2. Far detector in second phase limit to the size of large underground Water Cherenkov detectors will be given by the difficulties of excavation. Max width is about 50-60 meters.=> increase high&length Phase-II: Hyper-K 1,000 kt Phase-I: Super-K 22.5kt (50kt) Candidate site in Kamioka Other major goal: improve proton decay reach

  3. SPL neutrino beam Still work to do to fucus these… nm * At 2 GeV, K production is very small • Bkg of from ne in the beam is small and dominated by muon decay This can be tailored by varying the length of the decay tunnel and reduced to 0.3-0.4 % (all spectrum) * this is a low energy beam ( <En> = 300 MeV ) ne

  4. /e Background Rejection e/mu separation directly related to granularity of coverage. Limit is around 10-3 (mu decay in flight) SKII coverage OKOK, less maybe possible

  5. En reconstruction < 1GeV region m- m- nm+ n→ m+ p+ p nm+n→m + p (Em, pm) (Em, pm) ql qm n n p p inelastic CCqe  CC quasi elastic reaction p Inelastic (BG) Small BG 5 X smaller for SPL beam s~80MeV(10%) limited by Femi motion SK Full Det. Sim. Energy can be well reconstructed =>Bkg reduction • precise measurement of osc. params • SENSITIVITY SIMILAR TO JHF-> HyperK

  6. BETA Beam new idea by P. Zucchelli produce 6He++, store, accelerate (100 GeV/u), store 6He++  6Li+++ ne e- Q=3.5078 MeV T/2 = 0.8067 s pure anti-ne beam at  600 MeV or: pure ne beam at  600 MeV oscillation signal: appearance of low energy muons no opposite charge neutrinos=> no need for magnetic detectors little matter effects at these energies water Cerenkov excellent for this too, same as for Superbeam. seems feasible; but cost unknown so far. Critical: duty cycle. A nice *** idea to be followed up!

  7. Anti-Neutrino Source B Consider 6He++6Li+++ne e- E03.5078 MeV T/2  0.8067 s 1. The ion is spinless, and therefore decays at rest are isotropic. 2. It can be produced at high rates, I.e. 5E13 6He/s DATA and theory: <Ekine>=1.578 MeV <En>=1.937 MeV RMS/<En>=37% 3. The neutrino spectrum is known on the basis of the electron spectrum. B.M. Rustand and S.L. Ruby, Phys.Rev. 97 (1955) 991 B.W. Ridley Nucl.Phys. 25 (1961) 483

  8. Neutrino Source B Possible neutrino emitter candidate:18Ne The same technology used in the production of 6He is limited in the 18Ne case to 1012 ions/s. Dedicated R&D should increase this figure. Use this intensity as reference. Issues: MgO less refractory, heat dissipation

  9. Beta Beam (P. Zucchelli) M. Lindroos et al.

  10. Combination of beta beam with low energy super beam Unique to CERN: need few 100 GeV accelerator (PS + SPS will do!) experience in radioactive beams at ISOLDE many unknowns: what is the duty factor that can be achieved? (needs < 10-3 ) combines CP and T violation tests e m (+) (T) m e (p+) (CP) e m (-) (T) m e (p-) Can this work???? theoretical studies now on beta beam + SPL target and horn R&D  design study together with EURISOL

  11. Superbeam & Beta Beam cost estimates E

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