a.b. balantekin #, j.h. de jesus #, r. lazauskas, c. volpe # #university of wisconsin, madison,...

A.B. BalantekinA.B. Balantekin##, J.H. de Jesus, J.H. de Jesus##,, R. Lazauskas*R. Lazauskas*, C. Volpe*, C. Volpe*##University of Wisconsin, Madison, USA *IPN, Orsay (France)

A Conserved Vector Current test using low energy A Conserved Vector Current test using low energy beamsbeams

SUPERNOVA

ATMOSPHERE

SUN,REACTOR

ACCELERATORS

10 50 100 1000 (MeV)500

-Energy

Understanding neutrino-nucleus interaction

Experimental data are very scarce (deuteron and iron, carbon).Theoretical predictions are necessary but …

Nuclear Physics



THE PROPOSAL

C. Volpe, Journ. Phys. G. 30 (2004), hep-ph/0303222.

To exploit the beta-beam concept to produce intense and pure low energy (10-100 MeV) neutrino beams.

boost

6He 6He

Low-energy Beta-beams

P. Zucchelli, Phys. Lett. B 532 (2002) 166for CP and CPT violation studies in sector



PS

SPS

EURISOL

Beta-beam baseline

at CERN


Feasibility Study within EURISOL Design Study(2006-2009)

Acceleration issuesM. Benedikt andM. Lindroos, CERN

Storage Ring

J. Payet andA. Chancé, CEA Saclay, France

- Size (D~700 m or D~900 m)- Space-charge effects- Duty cycle- Intensities

closedetector(s)

Storage Ring

Low-energy beta-beam Small Storage ring-detector:Small Storage ring-detector:J. Serreau, C. Volpe: Phys.Rev. C70 (2004) 055502

6He & 18Ne,

(=7-14)

Hig

h-e

nerg

y b

eta

-beam

(~100)

I(6He)=1013 ions/s

I(18Ne)=1.8*1011

ions/s

I(6He)=2.7*1012 ions/s

I(18Ne)=0.44*1011 ions/s



Neutrino properties, like the magnetic momentG.C. McLaughlin, C. Volpe, Phys.Lett.B591 (2004) 229

PHYSICS POTENTIAL

Neutrino-nucleus interaction studiesC. Volpe: Eurisol proposal; R. Lazauskas , C.Volpe: in preparation; A. Bueno et al.: Phys. Rev. D74 (2006) 033010


Aspects related with astrophysics: Supernova-neutrino spectra N. Jachowicz, G.C. McLaughlin: Phys.Rev.Lett. 96 (2006) 172301

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

….



• Let first understand the simplest .. Target s(x10-42 cm2) at 40 MeV

p 105.

d 46.9

12C 10.1

16O 6.4

56Fe 119.

208Pb 2200



The most general form:The most general form:

CVC hypothesis:CVC hypothesis: Negligible ~me2?



CVCCVC tests 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 inmirror nuclei A=12 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.



D=678 m d=10 m

Small Storage ring-detector:Small Storage ring-detector:J. Serreau, C. Volpe: Phys.Rev. C70 (2004) 055502

e+

e

h=15 m

r

I(6He)=2.7x1012 ions/s



7 8 9 10 11 12 13 140

1x104

2x104

3x104

4x104

5x104

boost

Num

ber

of e

vent

s WM on



7 8 9 10 11 12 13 140

1x104

2x104

3x104

4x104

5x104

boost

Num

ber

of e

vent

s

WM on WM off



-1.0 -0.5 0.0 0.5 1.00.00

0.25

0.50

=14 WM off

[d

N/d

(cos

())

]/N

cos()

=7 WM off

Positron angular distribution



-1.0 -0.5 0.0 0.5 1.00.00

0.25

0.50

=14 WM on WM off

[d

N/d

(cos

())

]/N

cos()

=7 WM on WM off

Positron angular distribution



Statistics for t=1 year

Stat. error only +2% syst. error

Angular distrib.No of counts



Statistics for t=1 year

Stat.err+2% syst.+5% syst.+10% syst.



Conclusion

• Low energy -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 -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.

a.b. balantekin #, j.h. de jesus #, r. lazauskas*, c. volpe* # #university of wisconsin, madison,...

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a.b. balantekin #, j.h. de jesus #, r. lazauskas, c. volpe # #university of wisconsin, madison,...