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Measuring the complete Solar neutrino spectrum

Measuring the complete Solar neutrino spectrum. LENS. complementary use: sterile neutrinos. E th =114 keV (95% of pp spectrum) Measure pp-  flux @ 3% Determine CNO-fraction Measure T sun by change in mean energy of 7 Be line – maybe (hep-ph/9309292)

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Measuring the complete Solar neutrino spectrum

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  1. Measuring the complete Solar neutrino spectrum LENS complementary use: sterile neutrinos • Eth=114 keV (95% of pp spectrum) • Measure pp- flux @ 3% • Determine CNO-fraction • Measure Tsun by change in mean energy of 7Be line – maybe (hep-ph/9309292) • needs separate calibration experiment –”LENS Sterile”

  2. Ee1 t LENS Solar Neutrino Spectrum pp In() 7Be 7Be* pep 15O 15N pp background x 10-3 cascade signal Apply cut algorithm keep ~50%

  3. mini-LENS project goals • establish readiness of LENS to community • scale-up production of In loaded scintillator • implement scintillation lattice technology • demonstrate In background suppression • see cosmic pp proxy events • measure Q-value of In beta decay • optimize scale-up route to LENS • broaden collaboration

  4. mini-LENS concept

  5. Electronics PMTs quad fan in/out 0 ns 3  1 40 ns 10  3 thresholddiscriminator 38  10 150  38 80 ns 120 ns trigger (2.5 kHz In) x10 computer200 nsreadper event transient digitizer(2 ns, 8 bit) high voltage

  6. Scintillator Current Status with PC 1. Indium concentration ~8%wt (higher may be viable) 2. Scintillation signal efficiency (working value): 9000h/MeV 3. Transparency at 430 nm: L(1/e) (working value): 10m 4. Chemical and Optical Stability: at least 1 year 5. InLS Chemistry - Robust • Work in Progress • Linear Alkylbenzene (LAB) • Lower cost • Safer • Better chemical compatibility • Good optical properties • …so far: ~70% of light obtained with PC (with In)

  7. Lattice Structure Single Foil Double Foil Solid teflon segmentation Double-layer (air-gap) lattice

  8. Segmentation Options • Foils: • Various Teflons • Acrylic • 3) PET • Solid: • Solid scintillating plastic cubes (for outer region) • Hollow scintillating plastic cubes

  9. Surface and Underground Operation (Homestake? orKimballton) ‘Proxy Events’ 18/yr @ surface<1/yr @ 1400mwe

  10. Goals for 2007 • Project Integration • Virginia Tech and TUNL • Electronics and Trigger Design • TUNL • Scintillator Preparation and Fluid Handling • Brookhaven • Lattice Fabrication • Virginia Tech • Monte Carlo and Advanced Electronics • Oak Ridge

  11. DUSEL Context • Solar Neutrinos highlighted in S1 report • Solar Neutrinos identified in NSAC LRP • LENS in first ‘suite of experiments’ at • Homestake • Henderson • Soudan • Cascades • mini-LENS proposal submitted to NSF and DOE (as part of DUSEL R&D solicitation)

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