What does the LEND CSETN really measure?

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What does the LEND CSETN really measure?




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Presentations text content in What does the LEND CSETN really measure?

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What does the LEND CSETN really measure?

V.Eke

(ICC, Durham University, UK)

L.Teodoro

(BAER, NASA Ames)

D.Lawrence

(JHU APL)

R.Elphic

(NASA Ames)

W.Feldman

(PSI, Tucson)

(See Eke et al, 2012,

ApJ

, 747, 6)

Slide2

‘Omni-directional’ LEND

Slide3

‘Omni-directional’ LEND

‘Collimated’ LEND

Slide4

Litvak

et al, 2012, LPSC

Sanin et al, 2011, LPSC

Slide5

Spacecraft

Lunar

u

ncollimated

Lunar collimated

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First 15 months of LEND CSETN data

Average count rate=3.6/s

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Component fractions

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CSETN data

Most likely model

Mitrofanov

et al 2010

Mitrofanov

et al 2011

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Conclusions

The LEND CSETN receives more than half of its counts from non-lunar sources

The lunar component is clearly dominated by

uncollimated

high energy epithermal (HEE) neutrons, in contrast to claims by the LEND team

The LEND SHEEN has produced the first lunar HEE map – this is the scientific product from this detector.

Slide15

‘Omni-directional’ LEND

‘Collimated’ LEND

Slide16

Verification with Earth-based neutron

detectors

Spearman correlation coefficient=0.38

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Boynton et al, 2010, LEAG Meeting

McClanahan et al, 2010, LPSC

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The LEND CSETN

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