skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Report of the APS Neutrino Study Reactor Working Group

Abstract

The worldwide program to understand neutrino oscillations and determine the neutrino mixing parameters, CP violating effects, and mass hierarchy will require a broad combination of measurements. The group believes that a key element of this future neutrino program is a multi-detector neutrino experiment (with baselines of {approx} 200 m and {approx} 1.5 km) with a sensitivity of sin{sup 2} 2{theta}{sub 13} = 0.01. In addition to oscillation physics, the reactor experiment may provide interesting measurements of sin{sup 2} {theta}{sub W} at Q{sup 2} = 0, neutrino couplings, magnetic moments, and mixing with sterile neutrino states. {theta}{sub 13} is one of the twenty-six parameters of the standard model, the best model of electroweak interactions for energies below 100 GeV and, as such, is worthy of a precision measurement independent of other considerations. A reactor experiment of the proposed sensitivity will allow a measurement of {theta}{sub 13} with no ambiguities and significantly better precision than any other proposed experiment, or will set limits indicating the scale of future experiments required to make progress. Figure 1 shows a comparison of the sensitivity of reactor experiments of different scales with accelerator experiments for setting limits on sin{sup 2} 2{theta}{sub 13} if the mixing anglemore » is very small, or for making a measurement of sin{sup 2} 2{theta}{sub 13} if the angle is observable. A reactor experiment with a 1% precision may also resolve the degeneracy in the {theta}{sub 23} parameter when combined with long-baseline accelerator experiments. In combination with long-baseline measurements, a reactor experiment may give early indications of CP violation and the mass hierarchy. The combination of the T2K and Nova long-baseline experiments will be able to make significant measurements of these effects if sin{sup 2} 2{theta}{sub 13} > 0.05 and with enhanced beam rates can improve their reach to the sin{sup 2} 2{theta}{sub 13} > 0.02 level. If {theta}{sub 13} turns out to be smaller than these values, one will need other strategies for getting to the physics. Thus, an unambiguous reactor measurement of {theta}{sub 13} is an important ingredient in planning the strategy for the future neutrino program.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; « less
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Director, Office of Science. Office of High Energy and Nuclear Physics. Division of High Energy Physics (US)
OSTI Identifier:
834324
Report Number(s):
LBNL-56599
R&D Project: 366256; TRN: US0407072
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 28 Oct 2004
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCELERATORS; ACCURACY; MAGNETIC MOMENTS; NEUTRINO OSCILLATION; NEUTRINOS; OSCILLATIONS; PHYSICS; PLANNING; SENSITIVITY; STANDARD MODEL; NEUTRINO REACTOR OSCILLATION EXPERIMENT THETA13 APS

Citation Formats

Abouzaid, E, Anderson, K, Barenboim, G, Berger, B, Blucher, E, Bolton, T, Choubey, S, Conrad, J, Formaggio, J, Freedman, S, Finely, D, Fisher, P, Fujikawa, B, Gai, M, Goodman, M, de Goueva, A, Hadley, N, Hahn, R, Horton-Smith, G, Kadel, R, Kayser, B, Heeger, K, Klein, J, Learned, J, Lindner, M, Link, J, Luk, K -B, McKeown, R, Mocioiu, I, Mohapatra, R, Naples, D, Peng, J, Petcov, S, Pilcher, J, Rapidis, P, Reyna, D, Shaevitz, M, Shrock, R, Stanton, N, Stefanski, R, Yamamoto, R, and Worcester, M. Report of the APS Neutrino Study Reactor Working Group. United States: N. p., 2004. Web. doi:10.2172/834324.
Abouzaid, E, Anderson, K, Barenboim, G, Berger, B, Blucher, E, Bolton, T, Choubey, S, Conrad, J, Formaggio, J, Freedman, S, Finely, D, Fisher, P, Fujikawa, B, Gai, M, Goodman, M, de Goueva, A, Hadley, N, Hahn, R, Horton-Smith, G, Kadel, R, Kayser, B, Heeger, K, Klein, J, Learned, J, Lindner, M, Link, J, Luk, K -B, McKeown, R, Mocioiu, I, Mohapatra, R, Naples, D, Peng, J, Petcov, S, Pilcher, J, Rapidis, P, Reyna, D, Shaevitz, M, Shrock, R, Stanton, N, Stefanski, R, Yamamoto, R, & Worcester, M. Report of the APS Neutrino Study Reactor Working Group. United States. https://doi.org/10.2172/834324
Abouzaid, E, Anderson, K, Barenboim, G, Berger, B, Blucher, E, Bolton, T, Choubey, S, Conrad, J, Formaggio, J, Freedman, S, Finely, D, Fisher, P, Fujikawa, B, Gai, M, Goodman, M, de Goueva, A, Hadley, N, Hahn, R, Horton-Smith, G, Kadel, R, Kayser, B, Heeger, K, Klein, J, Learned, J, Lindner, M, Link, J, Luk, K -B, McKeown, R, Mocioiu, I, Mohapatra, R, Naples, D, Peng, J, Petcov, S, Pilcher, J, Rapidis, P, Reyna, D, Shaevitz, M, Shrock, R, Stanton, N, Stefanski, R, Yamamoto, R, and Worcester, M. Thu . "Report of the APS Neutrino Study Reactor Working Group". United States. https://doi.org/10.2172/834324. https://www.osti.gov/servlets/purl/834324.
@article{osti_834324,
title = {Report of the APS Neutrino Study Reactor Working Group},
author = {Abouzaid, E and Anderson, K and Barenboim, G and Berger, B and Blucher, E and Bolton, T and Choubey, S and Conrad, J and Formaggio, J and Freedman, S and Finely, D and Fisher, P and Fujikawa, B and Gai, M and Goodman, M and de Goueva, A and Hadley, N and Hahn, R and Horton-Smith, G and Kadel, R and Kayser, B and Heeger, K and Klein, J and Learned, J and Lindner, M and Link, J and Luk, K -B and McKeown, R and Mocioiu, I and Mohapatra, R and Naples, D and Peng, J and Petcov, S and Pilcher, J and Rapidis, P and Reyna, D and Shaevitz, M and Shrock, R and Stanton, N and Stefanski, R and Yamamoto, R and Worcester, M},
abstractNote = {The worldwide program to understand neutrino oscillations and determine the neutrino mixing parameters, CP violating effects, and mass hierarchy will require a broad combination of measurements. The group believes that a key element of this future neutrino program is a multi-detector neutrino experiment (with baselines of {approx} 200 m and {approx} 1.5 km) with a sensitivity of sin{sup 2} 2{theta}{sub 13} = 0.01. In addition to oscillation physics, the reactor experiment may provide interesting measurements of sin{sup 2} {theta}{sub W} at Q{sup 2} = 0, neutrino couplings, magnetic moments, and mixing with sterile neutrino states. {theta}{sub 13} is one of the twenty-six parameters of the standard model, the best model of electroweak interactions for energies below 100 GeV and, as such, is worthy of a precision measurement independent of other considerations. A reactor experiment of the proposed sensitivity will allow a measurement of {theta}{sub 13} with no ambiguities and significantly better precision than any other proposed experiment, or will set limits indicating the scale of future experiments required to make progress. Figure 1 shows a comparison of the sensitivity of reactor experiments of different scales with accelerator experiments for setting limits on sin{sup 2} 2{theta}{sub 13} if the mixing angle is very small, or for making a measurement of sin{sup 2} 2{theta}{sub 13} if the angle is observable. A reactor experiment with a 1% precision may also resolve the degeneracy in the {theta}{sub 23} parameter when combined with long-baseline accelerator experiments. In combination with long-baseline measurements, a reactor experiment may give early indications of CP violation and the mass hierarchy. The combination of the T2K and Nova long-baseline experiments will be able to make significant measurements of these effects if sin{sup 2} 2{theta}{sub 13} > 0.05 and with enhanced beam rates can improve their reach to the sin{sup 2} 2{theta}{sub 13} > 0.02 level. If {theta}{sub 13} turns out to be smaller than these values, one will need other strategies for getting to the physics. Thus, an unambiguous reactor measurement of {theta}{sub 13} is an important ingredient in planning the strategy for the future neutrino program.},
doi = {10.2172/834324},
url = {https://www.osti.gov/biblio/834324}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {10}
}