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Taking a picture of the Earth’s Interior with Geoneutrinos. Honolulu, HI 12/15/2005 Kathrin A. Hochmuth MPI für Physik München. Outline:. The earth` s interior Theoretical angular distribution of geoneutrinos

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taking a picture of the earth s interior with geoneutrinos
Taking a picture of the Earth’s Interior with Geoneutrinos

Honolulu, HI

12/15/2005

Kathrin A. Hochmuth

MPI für Physik

München

outline
Outline:
  • The earth` s interior
  • Theoretical angular distribution of geoneutrinos
  • Measuring geoneutrinos with large volume liquid scintillation detectors (LENA detector)
what do we know about earth s interior
What do we know about Earth’s Interior?

Density obtained by monitoring seismic activities

Bulk Silicate Earth Model for Crust-

Mantle based e.g. on planetary and meteoritic probes

But: deepest drill-holes ~ 10km

Deepest mantle material (volcanoes) ~ 100km

No detailed information about the core!

Only 50% of terrestrial heat flow explained!

Earth’s Interior still a mystery

what to use
What to use …
  • Bulk Silicate Earth Model
  • Preliminary Reference Earth Model
  • Laboratory Experiments suggesting potassium-iron alloys in the core

http://www.edu.pe.ca/southernkings/compositionch.htm

first steps to get a neutrino picture of the earth
First steps to get a neutrino picture of the earth

Using the density profile

given in the Preliminary

Reference Earth Model to

Divide Earth into shells of

constant density

Work w/ B.D. Fields

with

towards a real model
Towards a real model

Bulk Silicate Earth Model

Preliminary reference earth model

Neutrino Oscillations:

LV~10km vs. LM~1000km

Neglect matter effects

sun vs earth
Sun vs. Earth

http://elvis.phys.lsu.edu/svoboda/superk.html

measurable spectra
Measurable Spectra

U/Th ratio measurable

Conclusions for K abundance possible

Note: Only 13% of uranium neutrinos and 9% of thorium above 1.8 MeV

future measurements
Future Measurements

Lena

Main backgound 13C(a,n)16O reduced

Large distance to nuclear power plants

Increased detector volume (here 50 kton)

angle dependent measurements
Angle dependent measurements???

Momentum conservation (proton at rest)

2 MeV  cosq = 0.95

3.2 MeV  cosq = 0.79

slide17

Challenging…

  • Dependent on:
  • Displacement (fixed:theory~1.5cm;CHOOZ~1.9cm)
  • Light yield (scintillator properties)
  • Loading of scintillator (Gadolinium, Lithium; stability?)
  • Precision of Neutron Detection (Detector Design)
slide18

crust

Core (mantle)

In collaboration with L.Oberauer, F.v.Feilitzsch,W.Potzel

Radial curve for 300 pe/MeV

slide19

Gd loaded

unloaded

slide20

Mantle model

Light yield 300pe/MeV

3s effect: 66060 events Gd loaded

250400 events unloaded PXE

summary what can we do
Summary-what can we do?
  • Test the U/Th of Bulk Silicate Earth
  • Test how much of the heat is primordial
  • Get the distribution of radioactive elements throughout the earth
  • Test if there are radioactive elements (only potassium?) in the core
  • Possibility of Earth Tomography
references
References:
  • Fields, Hochmuth [hep-ph/0406001]
  • Mantovani, Carmignani, Fiorentini, Lissia [hep-ph/0309013]
  • Rama Murthy, van Westrenen, Fei, Nature 423 (2003)
  • Gessmann, Wood, Earth Planet Sci Lett, 200 (2002)
  • Lee, Jeanloz, Geophys Res Lett, 30 (2003)
  • Dziewonski, Anderson, Phys Earth Plan Int 25, 297 (1981)
  • Table of Nuclides: http://atom.kaeri.re.kr/index.html
  • Super-K: http://elvis.phys.lsu.edu/svoboda/superk.html
  • Vogel, Beacom: arxiv:hep-ph/9903554
  • Chooz:arxiv:hep-ex/9906011
  • http://arxiv.org/abs/hep-ph/0401221
  • http://kamland.lbl.gov/Pictures/
  • http://www.greeklandscapes.com/maps/satellite.html
  • http://virtual.finland.fi/netcomm/news/showarticle.asp?intNWSAID=27070