1 / 12

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)

ellenraymond
Télécharger la présentation

Measuring the complete Solar neutrino spectrum

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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)

More Related