Atsuto Suzuki

History of Geo-neutrino Research and Dream

1. Ideas toDetect

Geo-neutrinos

1953

1956年

1953年

a

F. ReinesG. Gamow

1966

1969Geophysics by neutrinos, G. Marx

Czech J. Phys. B19 (1969) 1471-1479

1981

1984 Nature 310 (1984) 191 - 198

1998 Kobayashi and Fukao, Earth as an antineutrino star, Geophys. Res. Lett. 18 (1991) 633-636.

1998

1998

2. Geo-neutrino Detection

2005

Nature 310 (1984) 191 - 198

~ 50 years after G. Gamow’s suggestion~ 50 years after G. Gamow’s suggestion

fromEligio Lisi

S. Dye, Neutrino 2012

3. What’s Next ?

Geo-neutrinos after KamLAND : 2FK : 40K Detection

Geo-neutrinos after KamLAND : 2FK : 40K Detection

8B

pp

pep

hep

7Be

7Be N

OF

reactorat Kamiokareactorat Kamioka

UU

ThTh

KK

neutrino-electron elastic scattering

ne + p e+ + n

still dream

Geoneutrinos after KamLAND : 3:

Directionality Measurement

Geoneutrinos after KamLAND : 3:

Directionality MeasurementFCrust , FMantle , FCoreFCrust , FMantle , FCore

inverse b – decay reaction : 1st stepinverse b – decay reaction : 1st step

How to Measure DirectionHow to Measure Direction

ne

p

e+g

gDrreconstruct

Drreconstruct (cm)Drreconstruct (cm)

En = 2.5 MeV

inverse b – decay reaction : 2nd stepinverse b – decay reaction : 2nd step

How to Measure DirectionHow to Measure Direction

ne

p

e+

n q

En = 2.5 MeV

cos q

inverse b – decay reaction : 3rd stepinverse b – decay reaction : 3rd step

How to Measure DirectionHow to Measure Direction

ne

p

e+

n q*

g

X

cos q*

En = 2.5 MeV

ne + p e+ + nne + p e+ + n

n + A A* n + A A* + a and/or bw/o g’s + a and/or bw/o g’s

new liquid scintillator

still dream

nene~ 1 km

q13 measurement shallow detector

Geo-neutrino measurement

still dream

Hawaii : Highway to the HeavenHawaii : Highway to the Heaven

Hawaii : Highway to the MantleHawaii : Highway to the Mantle

4. More Dreams

KEK Penguin Diagram

dream !

dream !

dream !

dream !

E. Ohtani (Tohoku U.)

Moon

GreatParticle Microscopes and

Neutrino Telescopes