lena
DESCRIPTION
LENA. LENA Delta. L. Oberauer, F. von Feilitzsch, M. Göger-Neff, T. Marrodan, P. Pfahler, W. Potzel, M. Wurm Technische Universität München www.e15.physik.tu-muenchen.de/research/lena.htlm. Low Energy Neutrino Astrophysics. LENA 50 kt liquid scintillator detector. 100m. 30m. Muon veto. - PowerPoint PPT PresentationTRANSCRIPT
LENALENALow Energy Neutrino Low Energy Neutrino
AstrophysicsAstrophysicsL. Oberauer, F. von Feilitzsch, M. Göger-Neff, T.
Marrodan, P. Pfahler, W. Potzel, M. Wurm
Technische Universität München
www.e15.physik.tu-muenchen.de/research/lena.htlm
LENA Delta
Scintillator solvent: PXE, or PXE/mineral oil mixtureScintillator solvent: PXE, or PXE/mineral oil mixture
• non hazardous, flashpoint 160° C non hazardous, flashpoint 160° C easy handlingeasy handling
• density up to 0.99density up to 0.99 high self shielding high self shielding
• high light yieldhigh light yield low energy eventslow energy events
• low background level U, Thlow background level U, Th solar solar geo geo , snr , snr
Muon veto
30% coverage up to ~60% (light cones)
LENA
50 kt liquid scintillator detector
100m
30m
• transport transport of PXE via railwayrailway
• loadingloading of detector via direct pipeline pipeline
• no fundamental no fundamental securitysecurity problem problem with PXE with PXE
• no fundamental problem for excavationexcavation
• LENA is feasible in Pyhäsalmi !LENA is feasible in Pyhäsalmi !
LENA at CUPP
Scintillator for LENAScintillator for LENACTF at Gran Sasso (BOREXINO)
Absorption- and Scattering lengths at TU München
~ 100 pe / MeV for an event at the center
up to ~ 200 pe / MeV with light cones should be possible
Coverage 30%
Supernovae Relic Supernovae Relic ee
3 models (different spectral shapes):
Lawrence Livermore – LL
Keil, Raffelt, Janka – KRJ
Thompson, Burrows, Pinto - TBP
Large systematic uncertainties
UV (blue), H (green) and FIR (red) are impeded by dust extinction
SRN Rate (between 9.5 and 30 MeV):
40 – 77 / (10 a)
Background ~ 21 / (10 a)
Spectral shape analysis possible
Redshift z ~ 2
Separation LL vs. TBP possible (90% cl)
Supernovae Relic Supernovae Relic ee
nepe
Supernovae Relic Supernovae Relic ee
Threshold at Kamioka ~ 12 MeV (for water Cherenkov detectors)
Redshift z ~ 1
Between 21% and 37% lower rate (compared to Pyhäsalmi)
Best locations: Hawaii, Australia…
Supernova NeutrinosSupernova NeutrinosAssumption: Supernova II with 8 solar masses at 10 kpc distance
e flux and spectrum
e flux and spectrum
Supernova NeutrinosSupernova Neutrinos
Total neutrino flux
Total energy spectrum
Supernova and neutrino properties
„Wiggles“ in the e spectrum observable
• if spectra or fluxes of SN neutrino flavors differ
• if neutrinos pass the Earth before entering LENA
yes no
Smirnov, Dighe, Raffelt...
Solar NeutrinosSolar Neutrinos
• High statistic ( ~ 5.4 x 103 / day ) 7Be + e + e
test of small flux fluctuations in time
• CNO and pep – neutrinos ( ~ 3 x 102 / day )
solar neutrino luminosity
contribution of CNO cycle to solar energy release
• Charged current e (13C,13N) e- reaction ( ~ 103 / year )
spectroscopy of 8B- at energies below 5 MeV
(A. Ianni et al., hep-ph/0506171)
LENA Fiducial Volume for solar : 18 x 103 m3
Test of MSW effectTest of MSW effect
7Be pep CNO
8B 8B via 13C
MSW
effect
Geo NeutrinosGeo Neutrinos
• Detection via inverse beta decay
• measurement of radiogenic contribution to terrestrial heat (~ 40 TW)
• test of the Bulk Silicate Earth model
• test of unorthodox models of Earth‘s core (is there a breeder reactor ?)
LENA @ Pyhäsalmi: ~ 1.5 x 103 events / year
TNU
(1 capture in 1032 protons per year)
Scaling KamLAND result to LENA:
between
3 x 102 and
3 x 103 events / year
Rate of Geo-neutrinos in LENA
G. Fiorentini et al., hep-ph/0401085
Geo-neutrinos and LENAGeo-neutrinos and LENA
Displacement n,e+ for directionality ?
zenith angle distribution in LENA
e.g. 21 TW core model:
Indication (1 ) after a couple of years
…thanks to E. Lisi & Baksan group
LENA and Proton DecayLENA and Proton Decay
K
K
Event structure in LENA
Background suppression ~ 10(-4)
Acceptance ~ 60%
Actual SK limit 2.3 x 1033 y: after 10 years ~ 40 events (< 1 background event) 90%cl limit: 4 x 1034 years
T. Marrodan et al., Phys. Rev. D 72, 075014 (2005)
ConclusionConclusion
LENA: a low energy neutrino observatoryLENA: a low energy neutrino observatory
Impact on astro- ,particle-, geophysicsImpact on astro- ,particle-, geophysics
Complementary to Neutrino TelescopesComplementary to Neutrino Telescopes
Feasibility studies very promisingFeasibility studies very promising
LENA is in the ApPEC roadmapLENA is in the ApPEC roadmap
together with ~Mt Water Cherenkov and together with ~Mt Water Cherenkov and ~50 kt Liquid Argon Detectors~50 kt Liquid Argon Detectors
...thanks to Milla for the kind invitation to talk about LENA