Diapositive 1

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Physics with a very first
Low-energy Beta-beam
n
Cristina VOLPE Institut de Physique Nucléaire
Orsay, France
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Low-energy Beta-beams

• n-Nucleus Interactions
• Nuclear Astrophysics
• - Nuclear Structure Studies
• - Neutrino Physics

P L A N
Site
Status and Pespectives
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n
Zucchelli, PLB 2002
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Low-energy Beta-beams
C. Volpe, Journ. Phys. G. 30 (2004),
hep-ph/0303222.
THE PROPOSAL
To exploit the beta-beam concept to produce
intense and pure low energy (10-100 MeV)
neutrino beams.
A BETA-BEAM FACILITY FOR LOW ENERGY NEUTRINOS.
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n-Nucleus studies Motivation
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Understanding Nucleosynthesis
The site where the heavy elements are
synthetized is not known.
n-NUCLEUS INTERACTIONS ARE NEEDED.
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Meyer, McLaughlin, Fuller, 1998.
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NEUTRINOS AS a PROBE for NUCLEAR STRUCTURE
STUDIES.
ne 208Pb 208Bi e-
C. Volpe et al., Phys. Rev. C65, 2002.
EXAMPLE
ltEne gt 15 MeV
2
1-
3-
1-
30 MeV
1
0
Bi
Pb
50 MeV
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Neutrinoless Double-beta Decay
How do we search for the n-nature?
?
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Theoretical Situation
G phase space factor M nuclear
matrix elements ltmngt effective neutrino mass
Theoretical predictions (mainly performed within
Shell Model and QRPA) exhibit significant
variations of the neutrinoless double-beta decay
half-lives for the same candidate emitter.
This has important implications, in particular it
translates in an uncertainty on the n-mass.
REDUCING THE UNCERTAINTIES A MAJOR CHALLENGE.
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n-Nucleus Interactions Present status
Neutrinos probe nuclei over a wide energy range.
Nuclear Degrees of Freedom
Nucleon Degrees of Freedom
n-Energy
EFT, Microscopic Approaches (RPA, Shell Model),
EPT,
Fermi Gas
Experimental data are very scarce (deuteron and
iron, carbon). Theoretical predictions are
absolutely necessary.
The interpolation between these two regimes as
well as the extrapolation from stable to exotic
nuclei are needed.
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Low-energy Beta-beams
C. Volpe, Journ. Phys. G. 30 (2004),
hep-ph/0303222.
THE PROPOSAL
To exploit the beta-beam concept to produce
intense and pure low energy (10-100 MeV)
neutrino beams.
A BETA-BEAM FACILITY FOR LOW ENERGY NEUTRINOS.
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SITES
Neutrino-nucleus measurements
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SNS Proposal at OAK Ridge Laboratory
Y. Efremenko, 2004.
We have taken similar detectors.
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n-Nucleus Rates at low-energy b-beams
A SMALL DEVOTED STORAGE RING IS BETTER.
INTERESTING INTERACTION RATES CAN BE OBTAINED.
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Low-energy Beta-beams
Feasibility Study within EURISOL Design Study
Beta-beam baseline at CERN
E U R I S O L
Acceleration issues
SPS
M. Benedikt and M. Lindroos, CERN
Storage Ring
PS
Storage Ring

• Size
• Space-charge effects
• Duty cycle
• Intensities

n
close detector
n

• J. Payet and
• Chancé,
• CEA Saclay, France

Detectors issues (remember LSND and KARMEN)
THE FEASIBILITY STUDY just STARTED.
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Conclusions and Perspectives
Low-energy beta-beams might furnish the very
first beta-beam.