Executive Summary

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Executive Summary
Neutrino Science at LBNL Present Program and
Future Options
Neutrino Working Group
R.N. Cahn, W.C. Carithers, S.J. Freedman, K.M.
Heeger, R.W. Kadel, V. Koch, K.T. Lesko, Z.
Ligeti (deputy), K-B. Luk, H. Murayama, E.B.
Norman, D.R. Nygren, A.M. Sessler, R.G.
Stokstad (chair), J.S. Wurtele, and M.S. Zisman
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Charge
The working group should survey the theoretical
landscape and recent experimental results to
provide a framework for understanding which will
be the most compelling next set of neutrino
experiments world-wide. All ongoing and planned
neutrino-related work at LBNL should be surveyed
and placed into the above context by the working
group through discussion with the proponents. The
resulting theoretical context, the ongoing
program, and future options should be presented
at a joint one-day retreat and workshop in early
December open to members of all three divisions.
The future plan should lay the groundwork for
development of proposals (both LDRD and external)
for support of our work.
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Science
Recent Discoveries
Open Questions
Majorana or Dirac ? Absolute Mass Scale
? Mass hierarchy ? q13 ? CP violation
? H.E. n's from the Cosmos ?
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Present Program
Neutrino properties
SNO Solar n's q12 ,
Dm212 KamLAND Reactor n's q12 ,
Dm212 Cuoricino bb decay m, Maj or
Dir Neutrino Factory RD Accelerator n's
d (CP-viol.)
RD for next generation solar n detector
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Opportunities
Must invest in the future. Exciting
opportunities abound. Future will be mix of
present and new experiments. Must make wise
choices - science suitability for LBNL.
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Resources and Strategy
Resources to pursue an opportunity are
modest. Resources to implement a funded proposal
can be significant. Success in pursuing an
opportunity is not guaranteed a priori.
pursue several opportunities Strategy have a
balance of funded experiments in progress and
options being pursued. Selecting options to
pursue requires setting priorities
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Criteria
Is the science outstanding? Fundamental, timely,
important consequences, Is it appropriate for
LBNL? We must make a unique and important
contribution. Is there local interest and
expertise? Who wants to do it? Is it within
the realm of possibility? Prospects for funding,
interdivisional/UCB collaboration, resources,
national need (long range plans), etc.
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Priorities
The first requirement in addressing the future is
to meet the commitments implicit in the present
program. Success in meeting present commitments
provides the basis on which we build the future
--- a future that will contain elements of the
present program and new initiatives.
Priority for opportunities 1. Neutrinoless
double beta decay 2. A reactor measurement of
q13 3. Measurements of q12 and tests of the
Standard Solar Model 4. Development of
scientific and tech. infrastructure for NUSEL
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Double Beta Decay
Opportunities
The next generation of 0n-bb detectors will have
the sensitivity to detect effective masses of
10's of meV -- in the mass range suggested by
oscillation experiments.
CUORE (Cryogenic Underground Observatory for Rare
Events) 760kg of 130Te TeO2 crystals at 10omK
10M proposal in preparation 40kg
(Cuoricino) has begun taking data
Majorana 500kg 76Ge cooled crystals, enriched
isotope, 100M LBNL Ge detector technology
(GRETA, g-ray tracking) ideal for Majorana
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Reactor n meas. of q13
Opportunities
Two detectors appropriately positioned between 2
and 10 km. Secondary oscillations determine q13.
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Opportunities
Solar Neutrino Measurements of q12
Increase precision on fundamental matrix
element. Definitive tests of Standard Solar Model.
KamLAND-II -- reduce backgrounds to enable
detection of 7Be solar neutrinos. Next Generation
Solar Neutrino detector -- detection of pp solar
neutrinos. LBNL involved in RD on HERON.
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NUSEL
Opportunities
The longstanding goal of a national underground
laboratory may be achieved in the near future in
a facility that would be funded by the NSF.
LBNL will likely be involved in experiments to
be sited there. LBNL could further the cause of
NUSEL by participating in the development of the
scientific and technical infrastruture of the
underground laboratory.
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History
We have made good choices in the past 1989 -
Sudbury Neutrino Observatory 1990 - NTD
Thermistors for Cuoricino (NSD joined in
1998) 1995 - Neutrino Factory RD 1997 -
AMANDA/IceCube 1999 - KamLAND
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FUTURE
We have excellent opportunities to pursue now
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Neutrino Science Effort
Presently 34 FTE

• IceCube 14
• KamLAND 9
• SNO 5
• Factory 3
• Cuoricino 1.5
• Solar n RD 1.5

• Scientists 14
• PostDocs 6
• GSRA 3
• Engineers 10