SUPERNOVA

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Understanding neutrino-nucleus interaction
ATMOSPHERE
SUN,REACTOR
500
10
50
(MeV)
100
1000
n-Energy
ACCELERATORS
SUPERNOVA
Nuclear Physics
Experimental data are very scarce (deuteron and
iron, carbon). Theoretical predictions are
necessary but
2
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.
n
n
6He
6He
boost
P. Zucchelli, Phys. Lett. B 532 (2002) 166 for
CP and CPT violation studies in n sector
Low-energy Beta-beams
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Feasibility Study within EURISOL Design
Study (2006-2009)
Beta-beam baseline at CERN
I(6He)1013 ions/s I(18Ne)1.81011 ions/s
E U R I S O L
Acceleration issues
SPS
M. Benedikt and M. Lindroos, CERN
PS
Storage Ring

• Size (D700 m or D900 m)
• Space-charge effects
• Duty cycle
• Intensities

6He 18Ne, (g7-14)
I(6He)2.71012 ions/s I(18Ne)0.441011 ions/s

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

Low-energy Beta-beams
4
Fundamental tests Weinberg angle, CVC test A.B.
Balantekin, J.H. de Jesus, C. Volpe Phys.Lett.
B634 (2006) 180 A.B. Balantekin et al.,
Phys.Rev. D73 (2006) 073011
WATER CERENKOV DETECTOR
Aspects related with astrophysics
Supernova-neutrino spectra N. Jachowicz, G.C.
McLaughlin Phys.Rev.Lett. 96 (2006) 172301 
.
Low-energy Beta-beams
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• Let first understand the simplest .. nN

6
The most general form
Negligible me2
?
CVC hypothesis
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• CVC tests

• Vector form factor super-allowed beta decay
• J. C. Hardy and I. S. Towner, Phys. Rev. C
  71 (2005) 055501

• Tensor terms (weak-magnetism) Gamow-Teller
  transitions in
• mirror nuclei A12 triad
• Y. K. Lee, L. W. Mo and C. S. Wu, Phys. Rev.
  Lett. 10 (1963) 253.
• C. S. Wu, Rev. Mod. Phys. 36 (1964) 618.
• T .D. Lee and C. S. Wu, Ann. Rev. Nucl. Sci.
  15 (1965) 381.

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Small Storage ring-detector J. Serreau, C.
Volpe Phys.Rev. C70 (2004) 055502
I(6He)2.7x1012 ions/s
D678 m
d10 m
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Positron angular distribution
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Positron angular distribution
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Angular distrib. No of counts
Stat. error only
2 syst. error
Statistics for g12 t1 year
14
Stat.err
2 syst.
5 syst.
10 syst.
Statistics for g12 t1 year
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• Low energy b-beams can be powerful tool for
  neutrino physics
• and in particular neutrino-nucleus interaction
• We show  how weak magnetism term  can be
  determined with
• 9 (or even better) accuracy in one year
  measurement at low energy
• b-beam facility
• A.B. Balantekin, J.H. De Jesus, R. Lazauskas, C.
  Volpe, Phys.Rev. D73 (2006) 073011

Acknowledgements I acknowledge the financial
support of the EC under the FP6 "Research
Infrastructure Action-Structuring the European
Research Area" EURISOL DS Project Contract No.
515768 RIDS. The EC is not liable for any use
that can be made of the information contained
herein.
Conclusion