Direct evidence for neutrino flavor transformation from neutral-current interactions in SNO

The Sudbury Neutrino Observatory (SNO) is a 1,000 tonne heavy water Cerenkov‐based neutrino detector situated 2,000 meters underground in INCO’s Creighton Mine near Sudbury, Ontario, Canada. For the neutrinos from 8B decay in the Sun SNO observes the Charged Current neutrino reaction sensitive only to electron neutrinos and others (Neutral Current and Elastic Scattering) sensitive to all active neutrino types and thereby can search for direct evidence of neutrino flavor change. Using these reactions and assuming the standard 8B shape, the ve component of the 8B solar flux is φ e = 1.76 −0.05 +0.05 ( stat. ) −0.09 +0.09 (syst.) × 106 cm−2s−1 for a kinetic energy threshold of 5 MeV. The non‐ve component is φμτ = 3.41 −0.45 +0.45 ( stat. ) −0.45 +0.48 (syst.) × 106 cm−2s−1, 5.3σ greater than zero, providing strong evidence for solar ve flavor transformation. The total flux measured with the NC reaction is φNC = 5.09 −0.43 +0.44 ( stat. ) −0.43 +0.46 (syst.) × 106 cm−2s−1, consistent with solar models. For charged current events, assuming an undistorted 8B spectrum, the night minus day rate is 14.0% ± 6.3% −1.4 +1.5 % of the average rate. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the ve asymmetry is found to be 7.0% ± 4.9% −1.2 +1.3 % . A global solar neutrino analysis in terms of matter‐enhanced oscillations of two active flavors strongly favors the Large Mixing Angle (LMA) solution.

talk: Waterloo 2002/05/15
neutrino: solar
neutrino: flux
neutral current
neutrino: oscillation
neutrino: energy spectrum
SNO
experimental results

References(30)

Figures(0)

The Sudbury neutrino observatory

SNO

Collaboration

•

J. Boger
(
- Brookhaven
)

et al.

- Nucl.Instrum.Meth.A 449 (2000) 172-207
•
e-Print:
- nucl-ex/9910016
•
DOI:
- 10.1016/S0168-9002(99)01469-2

Direct Approach to Resolve the Solar Neutrino Problem

H.H. Chen
(
- UC, Irvine
)

- Phys.Rev.Lett. 55 (1985) 1534-1536,
- Phys. Rev. Lett. 55 ( 1985) 1534-1536,
•
DOI:
- 10.1103/PhysRevLett.55.1534

Measurement of the rate of $\nu_e+d \to p+p+e^-$ interactions produced by $^8$ B solar neutrinos at the Sudbury Neutrino Observatory

SNO

Collaboration

•

Q.R. Ahmad
(
- CENPA, Seattle
)

et al.

- Phys.Rev.Lett. 87 (2001) 071301
•
e-Print:
- nucl-ex/0106015
•
DOI:
- 10.1103/PhysRevLett.87.071301

Direct evidence for neutrino flavor transformation from neutral current interactions in the Sudbury Neutrino Observatory

SNO

Collaboration

•

Q.R. Ahmad

et al.

- Phys.Rev.Lett. 89 (2002) 011301
•
e-Print:
- nucl-ex/0204008
•
DOI:
- 10.1103/PhysRevLett.89.011301

The N-16 calibration source for the Sudbury Neutrino Observatory

M.R. Dragowsky
(
- Oregon State U. and
- LBL, Berkeley
)
,
A. Hamer
(
- Queen's U., Kingston
)
,
Y.D. Chan
(
- LBL, Berkeley
)
,
R. Deal
(
- Chalk River, AECL
)
,
E.D. Earle
(
- Chalk River, AECL
)

et al.

- Nucl.Instrum.Meth.A 481 (2002) 284-296
•
e-Print:
- nucl-ex/0109011
•
DOI:
- 10.1016/S0168-9002(01)02062-9

222Rn emanation into vacuum

Manqing Liu
(
- Queen's U., Kingston
)
,
H. W. Lee
(
- Queen's U., Kingston
)
,
A. B. McDonald
(
- Queen's U., Kingston
)

- Nucl.Instrum.Meth.A 329 (1993) 291-298
•
DOI:
- 10.1016/0168-9002(93)90948-H

Shape of the B-8 alpha and neutrino spectra

C.E. Ortiz
(
- Notre Dame U.
)
,
A. Garcia
(
- Notre Dame U. and
- LBL, Berkeley
)
,
R.A. Waltz
(
- Notre Dame U.
)
,
M. Bhattacharya
(
- Notre Dame U.
)
,
A.K. Komives
(
- Notre Dame U.
)

- Phys.Rev.Lett. 85 (2000) 2909-2912
•
e-Print:
- nucl-ex/0003006
•
DOI:
- 10.1103/PhysRevLett.85.2909

Neutrino reactions on deuteron

S. Nakamura
(
- Osaka U.
)
,
T. Sato
(
- Osaka U. and
- South Carolina U.
)
,
Vladimir P. Gudkov
(
- South Carolina U.
)
,
K. Kubodera
(
- South Carolina U.
)

- Phys.Rev.C 63 (2001) 034617,
- Phys.Rev.C 73 (2006) 049904 (erratum)
•
e-Print:
- nucl-th/0009012
•
DOI:
- 10.1103/PhysRevC.73.049904

Neutrino deuteron scattering in effective field theory at next-to-next-to-leading order

Malcolm Butler
(
- St. Mary's U., Halifax
)
,
Jiunn-Wei Chen
(
- Maryland U.
)
,
Xinwei Kong
(
- TRIUMF
)

- Phys.Rev.C 63 (2001) 035501
•
e-Print:
- nucl-th/0008032
•
DOI:
- 10.1103/PhysRevC.63.035501

Radiative corrections in neutrino deuterium disintegration

A. Kurylov
(
- Caltech, Kellogg Lab and
- Caltech and
- Connecticut U.
)
,
M.J. Ramsey-Musolf
(
- Caltech, Kellogg Lab and
- Caltech and
- Connecticut U.
)
,
P. Vogel
(
- Caltech, Kellogg Lab and
- Caltech
)

- Phys.Rev.C 65 (2002) 055501
•
e-Print:
- nucl-th/0110051
•
DOI:
- 10.1103/PhysRevC.65.055501

Neutrino deuteron reactions at solar neutrino energies

S. Nakamura
(
- Osaka U.
)
,
T. Sato
(
- Osaka U. and
- South Carolina U.
)
,
S. Ando
(
- South Carolina U.
)
,
T.S. Park
(
- South Carolina U.
)
,
F. Myhrer
(
- South Carolina U.
)

et al.

- Nucl.Phys.A 707 (2002) 561-576
•
e-Print:
- nucl-th/0201062
•
DOI:
- 10.1016/S0375-9474(02)00993-4

Remarks on the unified model of elementary particles

- Prog.Theor.Phys. 28 (1962) 870-880,
•
DOI:
- 10.1143/PTP.28.870

Neutrino astronomy and lepton charge

V.N. Gribov
(
- Ioffe Phys. Tech. Inst.
)
,
B. Pontecorvo
(
- Dubna, JINR
)

- Phys.Lett.B 28 (1969) 493,
- In *Pontecorvo, B.: Selected scientific works* 263-268
•
DOI:
- 10.1016/0370-2693(69)90525-5

Solar B-8 and hep neutrino measurements from 1258 days of Super-Kamiokande data

Super-Kamiokande

Collaboration

•

S. Fukuda
(
- Tokyo U., ICRR
)

et al.

- Phys.Rev.Lett. 86 (2001) 5651-5655
•
e-Print:
- hep-ex/0103032
•
DOI:
- 10.1103/PhysRevLett.86.5651

Solar models: Current epoch and time dependences, neutrinos, and helioseismological properties

John N. Bahcall
(
- Princeton, Inst. Advanced Study
)
,
M.H. Pinsonneault
(
- Ohio State U.
)
,
Sarbani Basu
(
- Yale U.
)

- Astrophys.J. 555 (2001) 990-1012
•
e-Print:
- astro-ph/0010346
•
DOI:
- 10.1086/321493

Matter Oscillations: Neutrino Transformation in the Sun and Regeneration in the Earth

A.J. Baltz
(
- Brookhaven
)
,
J. Weneser
(
- Brookhaven
)

- Phys.Rev.D 37 (1988) 3364
•
DOI:
- 10.1103/PhysRevD.37.3364

Zenith angle distributions at Super-Kamiokande and SNO and the solution of the solar neutrino problem

M.C. Gonzalez-Garcia
(
- Valencia U., IFIC
)
,
Carlos Pena-Garay
(
- Valencia U., IFIC
)
,
Alexei Yu. Smirnov
(
- ICTP, Trieste and
- Moscow, INR
)

- Phys.Rev.D 63 (2001) 113004
•
e-Print:
- hep-ph/0012313
•
DOI:
- 10.1103/PhysRevD.63.113004

SNO: Predictions for ten measurable quantities

- Phys.Rev.D 62 (2000) 093004
•
e-Print:
- hep-ph/0002293
•
DOI:
- 10.1103/PhysRevD.62.093004

Day - night effect predictions for the SNO detector

M. Maris
(
- Trieste Observ.
)
,
S.T. Petcov
(
- SISSA, Trieste and
- INFN, Trieste and
- Sofiya, Inst. Nucl. Res.
)

- Phys.Rev.D 62 (2000) 093006
•
e-Print:
- hep-ph/0003301
•
DOI:
- 10.1103/PhysRevD.62.093006

Robust signatures of solar neutrino oscillation solutions

John N. Bahcall
(
- Princeton, Inst. Advanced Study
)
,
M.C. Gonzalez-Garcia
(
- CERN and
- SUNY, Stony Brook and
- Valencia U., IFIC
)
,
Carlos Pena-Garay
(
- Valencia U., IFIC
)

- JHEP 04 (2002) 007
•
e-Print:
- hep-ph/0111150
•
DOI:
- 10.1088/1126-6708/2002/04/007

Nonadiabatic Level Crossing in Resonant Neutrino Oscillations

Stephen J. Parke
(
- Fermilab
)

- Phys.Rev.Lett. 57 (1986) 1275-1278,
- Phys. Rev. Lett. 57 ( 1986) 1275-1278 and Fermilab Batavia - FERMILAB-PUB-86-067-T (86,REC.JUN.) 11p,
•
e-Print:
- 2212.06978
•
DOI:
- 10.1103/PhysRevLett.57.1275

Exact analytic description of two neutrino oscillations in matter with exponentially varying density

S.T. Petcov
(
- Sofiya, Inst. Nucl. Res.
)

- Phys.Lett.B 200 (1988) 373-379
•
DOI:
- 10.1016/0370-2693(88)90791-5

Standard solar model uncertainties and their correlations in the analysis of the solar neutrino problem

Gian Luigi Fogli
(
- Bari U. and
- INFN, Bari
)
,
E. Lisi
(
- CERN and
- Bari U. and
- INFN, Bari
)

- Astropart.Phys. 3 (1995) 185-196
•
DOI:
- 10.1016/0927-6505(94)00041-Z

Analytical description of quasivacuum oscillations of solar neutrinos

E. Lisi
(
- INFN, Bari and
- Bari U.
)
,
A. Marrone
(
- INFN, Bari and
- Bari U.
)
,
D. Montanino
(
- Salento U.
)
,
A. Palazzo
(
- INFN, Bari and
- Bari U.
)
,
S.T. Petcov
(
- SISSA, Trieste and
- INFN, Trieste and
- Sofiya, Inst. Nucl. Res.
)

- Phys.Rev.D 63 (2001) 093002
•
e-Print:
- hep-ph/0011306
•
DOI:
- 10.1103/PhysRevD.63.093002

Measurement of the solar electron neutrino flux with the Homestake chlorine detector

B.T. Cleveland
(
- Pennsylvania U.
)
,
Timothy Daily
(
- Pennsylvania U.
)
,
Raymond Davis, Jr.
(
- Pennsylvania U.
)
,
James R. Distel
(
- Pennsylvania U.
)
,
Kenneth Lande
(
- Pennsylvania U.
)

et al.

- Astrophys.J. 496 (1998) 505-526
•
DOI:
- 10.1086/305343

1-25 of 30
1
2
25 / page