R. Lazauskas (SPhN Saclay), C. Volpe R. Lazauskas (SPhN Saclay), C. Volpe (IPN Orsay) Some aspects...

R. LazauskasR. Lazauskas (SPhN Saclay),(SPhN Saclay), C. Volpe C. Volpe (IPN Orsay)

Some aspects of neutrino interaction studies Some aspects of neutrino interaction studies using using

beta beamsbeta beams

SUPERNOVA

ATMOSPHERE

SUN,REACTOR

ACCELERATORS

10 50 100 1000 (MeV)500

-Energy

Neutrinos probe matter over a wide energy rangeNeutrinos probe matter over a wide energy range

-nucleus interaction studies-nucleus interaction studies, for:, for:- a better understanding of the nuclear excitations involved,- neutrino experiments (e.g. knowledge of detector response),- nuclear astrophysics (nucleosynthesis of heavy elements).

-properties to learn:-properties to learn:- mass hierarchy- mixing angle 13

- Majorana or Dirac nature?

- CP violation (phase )- magnetic moment- decay, …

Introduction



beta beamsbeta beams Experimental data is very scarce (D and 56F, 12C).

Theory is complicated, needs control*. Getting precise predictions in the low-energy range (20-100 MeV) is a challenging task. As example the discrepancies (exp/th) for -12C and (between calculations) for -208Pb.

*see eg. Brown, Hayes, Kolbe, Fuller, Haxton, Jachowitz, Kubodera, Langanke, Martinez-Pinedo, Mintz, McLaughlin, Oset, Pourkaviani, Vogel, Volpe, Singh, Towner, etc..




Can one dispose of Can one dispose of source?source?

Superbeam

- factory

Beta Beam (P. Zucchelli, Phys. Lett. B 532 (2002) 166)

manufactures

Production of e Purity in flavor Energy tuning Well known flux

boost

6He

6He

2

2

1

1vc




PS

SPS

Beta-beam idea

Original beta-beam(High energies >60 GeV/N)

Low energy beta-beam(energies ~10 GeV/N)

Detector(s)

EURISOL

Ion Source Accelerator Transfer line Storage ring

C. Volpe, Journ. Phys. G. 30 (2004) L1,

1st Goal: CP violation

1st Goal: cross sections

Beta-beam baseline

at CERN

133 km




PS

SPS

EURISOL

Low energy Beta-beam baseline

at CERN

Low-energy Beta-beam

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, PRC70 (2004) 055502

6He & 18Ne,

(=7-14)

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 POTENTIALPHYSICS POTENTIAL

Neutrino-nucleus interaction studiesC. Volpe, Journ. Phys. G. 30 (2004) L1,G.C. McLaughlin:Phys.Rev. C70 (2004) 045804C. Volpe: Eurisol proposal; R. Lazauskas , C.Volpe: arxiv0704.2724; A. Bueno et al.: Phys. Rev. D74 (2006) 033010

Low-energy Beta-beam

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

….




CVC hypothesis test

The most general form for The most general form for N interaction N interaction

CVC hypothesis:CVC hypothesis:

Superallowed -decay Weak magnetism




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.




Fundamental tests

CVC test using water Čerenkov detector:

D=678 m d=10 m

e+

e

h=15 m

r

I(6He)=2.7x1012 ions/sSmall Storage ring-detector:Small Storage ring-detector:J. Serreau, C. Volpe: PRC70 (2004) 055502




CVC hypothesis test

The most general form for The most general form for

CVC hypothesis:CVC hypothesis: ?

+ p → n + e-

Superallowed -decay

A.B. Balantekin et al., PRD73 (2006) 073011

Negligible

Weak magnetism

e+

e

h=15 m

r




CVC hypothesis test



+ p → n + e-

0%

2%

5%

10%

Superallowed -decay


Negligible

-1,0 -0,5 0,0 0,5 1,00,00

0,25

0,50

=14 WM on WM off

[dN

/d(c

os()

)]/N

cos()

=7 WM on WM off

Weak magnetism




CVC hypothesis test



+ p → n + e-

0%

2%

5%

10%

Superallowed -decay Weak magnetism

AccurateAccurate and and model independentmodel independent CVCCVC hypothesis hypothesis test is possibletest is possible


Negligible




Nuclear excitations

PbBi

0+

1+

1-

1-2+

3-

A better knowledge of spin-isospinresponse

NEUTRINOS AS a PROBE of NUCLEAR NEUTRINOS AS a PROBE of NUCLEAR STRUCTURESTRUCTURE

0+

0

1x10-40

2x10-40

0- 0+ 1- 1+ 2- 2+ 3- 3+ 4- 4+ 5- 5+

c

m

15 MeV

0

2x10-39

0- 0+ 1- 1+ 2- 2+ 3- 3+ 4- 4+ 5- 5+

30 MeV

c

m2

0

2x10-39

4x10-39

0- 0+ 1- 1+ 2- 2+ 3- 3+ 4- 4+ 5- 5+

60 MeV

c

m2

e + 208Pb 208Bi + e-

little or no experimental information is available.




Nuclear excitations

0

250

500

750

4-3+3-2+2-1+1-

0+

ev

=6 =10 =14

0-

0

250

500

750

4-3+3-2+2-1+1-

0+

ev

=6 =10 =14

0-

Gamow-TellerA better

knowledgeis neededR. Lazauskas, C. Volpe, accepted in NPA.

0

250

500

750

4-3+3-2+2-1+1-

0+

ev

=6 =10 =14

0-


PbBi

0+

1+

1-

1-2+

3-

0+

e + 208Pb 208Bi + e-

No exp. infoIAS

0 20 40 60 80 1000

2x10-5

4x10-5

(M

eV-1s-1

)

E (MeV)

=6 =10 =14 DAR




Nuclear excitations

0

250

500

750

4-3+3-2+2-1+1-

0+

ev

=6 =10 =14

0-

0

250

500

750

4-3+3-2+2-1+1-

0+

ev

=6 =10 =14

0-

R. Lazauskas, C. Volpe, accepted in NPA.

0

250

500

750

4-3+3-2+2-1+1-

0+

ev

=6 =10 =14

0-


PbBi

0+

1+

1-

1-2+

3-

0+

e + 208Pb 208Bi + e-

0 20 40 60 80 1000

2x10-5

4x10-5

(M

eV-1s-1

)

E (MeV)

=6 =10 =14 DAR

Low energy beta-beams as a tool to tool to studystudynuclear spin-isospin excitations



beta beamsbeta beams Can one use the original beta-beam for low energy neutrino experiments?

Place detector out of the large storage ring Place detector out of the large storage ring axisaxis

R. Lazauskas et al., submitted.

Original -beam for low energy

xA O

y

DD

0 20 40 60 80 100 120 1400

1x1010

2x1010

3x1010

E (MeV)

[

m s

-1M

eV-1]

le =14

Ecut

=150 MeV

=60 =100

E

cut=100 MeV

=60 =100

~ 50-80 m

2501 m



beta beamsbeta beams Can one use the original beta-beam for low energy neutrino experiments?

R. Lazauskas et al., submitted.

Original -beam for low energy

y

x

B O

D1

A

D2

0 20 40 60 80 100 120 1400

1x1010

2x1010

3x1010

x20

x3

x3

E (MeV)

[

m s

-1M

eV-1]

le =14 =60, E

max=100 MeV

=60, Emax

=150 MeV

he

0 20 40 60 80 100 120 1400

300

600

900

x20

x3dN

/(dE

*dt) [

yea

r-1M

eV-1]

E (MeV)

x3




Conclusion

Low energy beta-beams:

is rich and unique laboratory for neutrino interaction as well as fundamental studies

presents interest for research in several domains of physics

represents an interesting extension of EURISOL

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.

R. Lazauskas (SPhN Saclay), C. Volpe R. Lazauskas (SPhN Saclay), C. Volpe (IPN Orsay) Some aspects...

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