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Direct Detection of Dark Matter

Natallia Karpenka

Experimental Techniques in Particle Astrophysics

October 27, 2010

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Outline

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Qestion 1

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Qestion 2

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Qestion 3

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Qestion 4

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Qestion 1

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Qestion 2

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Qestion 3

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Qestion 4

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Question 1

Explain the how a WIMP interact can result in energy deposition in matter, e.g. ionisation, nuclear recoil. Use the Xenon ”two-phase TPC” to

illustrate this.

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The XENON two-phase TPC

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1

Qestion 1

2

Qestion 2

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Qestion 3

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Qestion 4

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Question 2

Discuss the structure of the CDMS experiment

(slide 21) with a focus on the shielding strategies.

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Cryogenic detectors

Different layers of shielding around the icebox

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Polyethylene shield

Polyethylene shield

Fast neutrons can be shielded in the most effective way by hydrogen. Fast neutrons are slowed down by collisions with hydrogen nuclei.

Thermal neutrons can be efficiently shielded using some additional elements in the shielding material e.g. boron, lithium, or cadmium.

The secondary gamma radiation comes from thermal neutron absorption in

hydrogen. This radiation can be minimized by using a shield containing

elements like boron or lithium.

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Lead shield

Lead shield

α

γ

x-rays

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1

Qestion 1

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Qestion 2

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Qestion 3

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Qestion 4

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Question 3

How does a bubble chamber work? How can one

distinguish neutron and WIMP interactions?

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How does a bubble chamber work?

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Qestion 1

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Question 4

Xenon is a high A material. What are the

consequences for calculating the spin dependent

WIMP interaction cross-section?

References

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