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PROSPECTS for detecting a
NEUTRINO MAGNETIC MOMENT with
a TRITIUM SOURCE and BETA-BEAMS
Cristina VOLPE(Institut de Physique Nucléaire ORSAY)
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Low-energy beta-beams,Possible sites
PLAN
Neutrino magnetic moment :Present limits
Prospects for :Tritium source and low-energy beta-beams
Conclusions and Perspectives
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Low-energy beta-beams
To exploit the beta-beam concept to produce intense and pure low-energy neutrino beams.
THE PROPOSAL
C. Volpe, hep-ph/0303222.
PHYSICS POTENTIALNeutrino-nucleus interaction studies are one ofthe possible axis of research.
eeC N
Neutrino properties.
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Possible sites
CERN
GANIL
EURISOL
GSI
Intensities Detectors
1012 /s 1 4
1012-13 /s 1 4
1012-13 /s 1-100
109 /s 1-10 4andClosedetector4andClosedetector
Autin et al,J.Phys. (2003).
H. Weick (GSI)
A. Villari (GANIL)
A PROPOSAL for a LOW-ENERGY BETA-BEAM facility.
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Neutrino magnetic moment
Indirect limits :
= 3.2 x 10-19 (m1 eV B
< 5. x 10-11 B- Nucleosynthesis
- Stellar Cooling
- Supernovae II explosions (SN1987A)
Morgan (1981), Fukugita and Yazaki (1987),…
< 3. x 10-12 B
Raffelt (1990),…
< 1.5-5 x 10-12 B
Lattimer and Cooperstein (1988), Goldmanet al. (1988), Notzold (1988),…
W
l
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Neutrino magnetic moment :Direct observation e
ee
e
Neutrino-electron scattering
22 eFmG
dtd
2
22222 1
ve
VAvAVAV
ETmggE
Tgggg
TET
me /1
2
2
WEAK
MAGNETIC
The presence of a magnetic moment introduces in e-e scattering, a 1/T-like divergence, where T is the electron recoil energy.
e
W
e
E
T
T/1
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Present best limits are from reactor experiments.
< 1.3 x 10-10 B
(90 %C.L.)Phys. Rev. Lett.90 (2003)TEXONO CollaborationKuo-Sheng Reactor
Neutrino magnetic moment : Direct limits
PRESENT LIMIT FROM DIRECT MEASUREMENTS: < 1.0 x 10-10 B.
< 1.0 x 10-10 B (90
%C.L.)MUNU Collaboration, PLB (2003)Bugey Reactor
Similar limits :JETP Lett. 55 (1992)Kurchatov Reactor
JETP Lett. 57 (1993) Rovno Reactor
eee
eE
T
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Prospects for Tritium source
G.C. McLaughlin and C. Volpe, hep-ph/0303222.
Number of e-e events with a 200 Mcurie (20 Kg) Tritium source and a 4 low-threshold detector (e.g. TPC or cryogenic).
THE LIMIT of a few x 10-12 B CAN BE OBTAINED.
Giomataris, hep-ex/ 0303045.
10-11 B
10-12 B
= 0
3H 3He+e+e QKeV
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Prospects for Low-energy Beta-beams
G.C. McLaughlin and C. Volpe, hep-ph/0303222.
THE LIMIT of a few x 10-11 B CAN BE OBTAINED.
10-10 B
= 0
5 x 10-11 B
10-11 B
5 X 10-11 B
e-e events with beta-beams (10 15 /s) with a 4 low-threshold detector.
6He 6Li+e+e QMeV
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Reactor Experiments
5 x 10-11 B
10-10 B
= 0
MUNU
Kou-Sheng
Uncertainty on the (<3 MeV) -flux
R1=5-100 keVR2=0.5-2.MeV
Li and Wong, J.Phys.G28(2002)1453.
A better understanding of the low-energy (less than 3 MeV) component of the reactor neutrino flux is needed.
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Conclusions
The direct measurement of a neutrino magneticmoment needs : - intense and well-understood neutrino fluxes; - very low-threshold detectors.
Improved limits of a few x 10-12 B and a few x 10-11 B can be achieved with a 20oMCi tritium source and low-energy beta-beams respectively.
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Perspectives
“Neutrino-nucleus interactions at a low-energy beta-beam facility”
J. Serreau and C. Volpe, in preparation.
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WORKSHOP at ECT* (TRENTO, Italy)18-22 October 2004
“EXPLORING THE IMPACT of NEW NEUTRINO BEAMS”
Organizers : C. Volpe (Coordinator)J. Bouchez, M. Lindroos,M. Mezzetto,T. Nillson.
Goals Present status and future projects in neutrino and nuclear physics The feasibility and physics potential of neutrino factories, super- beams, beta-beams and low-energy beta-beams
The impact in other fields, among which hadron physics, muon physics, baryogenesis and leptogenesis, nucleosynthesis, …