decay and neutrino mass 35 isotopes in nature …and Mixing Neutrino Mass.. Imperial College/RAL Nottingham Nov 17 ’04 Dave Wark.

decay and neutrino mass

35 isotopes in nature

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Imperial College/RAL

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Dave Wark

…and M

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Imperial College/RAL

NottinghamNov 17’04

Dave Wark

R

L

R

L

R

L

C

P

T

C

P

T

Lorentz

Boost,

E, B

Dirac Majorana

Dirac neutrino vs Majorana neutrino

Thanks to Adam Para for this and several other slides.

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Imperial College/RAL

NottinghamNov 17’04

Dave Wark

k

ki

ekk

kekee meUmUmm ek

22

Each is ±1 if CP conserved, but there can still be cancellations

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Imperial College/RAL

NottinghamNov 17’04

Dave Wark

22

2/1)(1

if

e

Mm

mspacephaset

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Imperial College/RAL

NottinghamNov 17’04

Dave Wark

Sum energy spectrum of both electrons

0: Peak at Q-value of nuclear transition

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Imperial College/RAL

NottinghamNov 17’04

Dave Wark

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Imperial College/RAL

NottinghamNov 17’04

Dave Wark

NEMO-3

2.7m

100Mo at 1025 years

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Imperial College/RAL

NottinghamNov 17’04

Dave Wark

From Elliot and Vogel, hep-ph/0202264

Neutrinoless BB-decay limits

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Imperial College/RAL

NottinghamNov 17’04

Dave Wark

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Imperial College/RAL

NottinghamNov 17’04

Dave Wark

Neutrinoless BB-decay Future ProjectsExperiment Author Isotope Detector description T5y

1/2(y) <m>*

COBRA Zuber 2001 130Te 10 kg CdTe semiconductors 1 x 1024 0.71

CUORICINOArnaboldi et al 2001

130Te 40 kg of TeO2 bolometers 1.5 x 1025 0.19

NEMO3 Sarazin et al 2000 100Mo 10 kg of bb(0n) isotopes (7 kg Mo) with tracking 4 x 1024 0.56

CUOREArnaboldi et al. 2001

130Te 760 kg of TeO2 bolometers 7 x 1026 0.027

EXODanevich et al 2000

136Xe 1 t enriched Xe TPC 8 x 1026 0.052

GEMZdesenko et al 2001

76Ge 1 t enriched Ge diodes in liquid nitrogen + water shield 7 x 1027 0.018

GENIUSKlapdor-Kleingrothaus et al 2001

76Ge 1 t enriched Ge diodes in liquid nitrogen 1 x 1028 0.015

MAJORANA Aalseth et al 2002 76Ge 0.5 t enriched Ge segmented diodes 4 x 1027 0.025DCBA Ishihara et al 2000 150Nd 20 kg enriched Nd layers with tracking 2 x 1025 0.035CAMEO Bellini et al 2001 116Cd 1 t CdWO4 crystals in liquid scintillator > 1026 0.069CANDLES Kishimoto et al 48Ca several tons of CaF2 crystal in liquid scintillator 1 x 1026

GSO Danevich 2001 160Gd2 t Gd2SiO5:Ce cristal scintillator in liquid scintillator

2 x 1026 0.065

MOON Ejiri et al 2000 100Mo 34 t natural Mo sheets between plastic scintillator 1 x 1027 0.036

XeCaccianiga et al 2001

136Xe 1.56 t of enriched Xe in liquid scintillator 5 x 1026 0.066

XMASSMoriyama et al 2001

136Xe 10 t of liquid Xe 3 x 1026 0.086

Need new experiments to reach ~ 10 meV

Normal hierarchy Inverted hierarchy

From

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hep

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0205

022

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Imperial College/RAL

NottinghamNov 17’04

Dave Wark