double beta decays of 100 mo and molybdenum observatory of neutrinos(moon) introduction neutrino...
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Double beta decays of 100Mo and Molybdenum Observatory Of Neutrinos(MOON)
Introduction Neutrino studied by 100Mo ELEGANT V and Oto Cosmo Observatory Molybdenum Observatory Of Neutrinos (MOON) Concluding Remarks
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Collaborators(Japan-USA)
K.Fushimi1,H.Ejiri2,J.Engel4,K.Hayashi5,R.Hazama3
T.Kishimoto6,P.Krastev7,N.Kudomi5,K.Kume5,H.Kuramoto5,
K.Matsuoka6,M.Nomachi6,H.Ohsumi8,R.G.H.Robertson3, K.Takahisa5, and S.Yoshida5 1. Dept. of Physics, The Univ. of Tokushima2. International Institute for Advanced Studies3. Nuclear Physics Lab.and Dept. of Physics, Univ. of Washington4. Dept. of Physics and Astronomy, Univ. of North Carolina5. RCNP, Osaka Univ.6. Dept. of Physics, Osaka Univ.7. Dept. of Physics, Univ. of Wisconsin8. Dept. of Physics, Saga Univ.
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Introduction
Double Beta Decay and Neutrino Properties Neutrino Property
Mass <m> RHC <RHC>
SN and Solar Neutrino Majoron
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Neutrino studied by 100Mo
Double Beta Decay 100Mo -> 100Ru Q=3.034MeV
Solar Neutrino SN Neutrino
100Mo -> 100Tc QEC=0.168MeV
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ELEGANT V and Oto Cosmo Observatory
100km from Osaka 150km from Tokushima Cosmic ray
4X10-7/cm2/s (1/100000) Neutron
4X10-5/cm2/s (1/100) 222Rn
10Bq/m3 (Same as outside)
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ELEGANT V ELEGANT V (ELEctron Gamma-ray Neutri
no Telescope) 100Mo Source film Drift chamber Plastic Scintillator NaI(Tl) Scintillator
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ELEGANT VNIM A302 (1991) 304
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BFGTBνββB/ Gχ||M|g|T 2221021 )1(][
Single Majoron Emitting decay
0B decay of 100Mo
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Measurement by EL V at Oto
Experimental data 0.14 kg yr 2
1.15X1019yr BG U,Th (MC simulation)
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Limits on <gB>
Nucleus
T0B1/2
X1021(yr)
|<gB>|X10-4
Ref.
100Mo 2.1 1.4 Present Worksubmitted PLB
100Mo 0.6 2.2 Nucl.Phys.A678(00)341
76Ge 64 0.83 hep-ph/0103062
136Xe 7.2 1.7 Phys.Let.B434(98)407
150Nd 0.28 1.1 Phys. Rev. C56(97)2451
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Limits on other modesKamioka(7333hr) and Oto(7562hr)Phys. Rev. C63(01) 065501
Mode Yield(COUNTS)
2nbb+BG(COUNTS)
efficiency
T1/2
(1022yr)
<m> 3 4.1 0.19 >5.5(10)
1 1.8 0.17
<> 3 4.1 0.11 >3.4(6.4)
1 1.8 0.11
<>’ 0 0.6 0.075 >4.2(8.5)
0 0.4 0.063
<> 3 4.1 0.18 >4.9(9.3)
1 1.8 0.14
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MOON Objectives . Spectroscopic real-time studies of tw
o rays from 100Mo. Double beta () decays with sensiti
vity of m~0.03 eV. Individual low energy solar and sup
ernova by inverse followed by successive
Phys. Rev. Lett. 85 (00) 291
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Solar- capture rates in units of SNU
Nucleus -Q(MeV) pp 7Be 13N pep 15O 8B Total
2H 1.442 0 0 0 0 ---- 6 6
37Cl 0.814 0 1.1 0.1 0.2 0.3 6.1 7.9
40Ar >1.505 0 0 0 0 0 7.2 7.2
71Ga 0.236 70.8 35 3.7 2.9 5.8 12.9 132
100Mo 0.168 639 206 22 13 32 27 965
115In 0.120 468 116 13.6 8.1 18.5 14.4 639
127I 0.789 0 9.4 ---- ---- ---- 13 24.6
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MOON
MOON, a super modules of nMo/100Mo& scintillators with modest volume and realistic purity.
High position resolution and adequate time window for two rays reduce correlated and accidental BG.
MOON with ~1 ton 100Mo is used for spectroscopic & real-time studies of Majorana with sensitivity of m ~0.03 eV by
Low E solar and supernova by inverse tagged by successive.
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MOON Plastic fiber-Mo Ensemble
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Concluding remarks
100Mo as Neutrino Microlaboratory Large responses for , Solar-, SN- ELEGANT V Stringent limits on <m>, Majoron etc. MOON
Realtime spectroscopic studies of Majorona m~0.03eV Low Energy Solar Neutrino and SN neutrino