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Daya  Bay Reactor Neutrino Experiment Daya  Bay Reactor Neutrino Experiment

Daya Bay Reactor Neutrino Experiment - PowerPoint Presentation

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Daya Bay Reactor Neutrino Experiment - PPT Presentation

On behalf of the DayaBay collaboration Virginia Polytechnic Institute and State University Joseph ykHor YuenKeung Hor Virginia Tech Daya Bay collaboration APS SouthEast meeting 2009 ID: 627713

daya bay virginia collaboration bay daya collaboration virginia meeting yuenkeung southeast aps tech hor 2009 amp detector site baseline design sensitivity sin

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Slide1

Daya Bay Reactor Neutrino ExperimentOn behalf of the DayaBay collaboration

Virginia Polytechnic Institute and State UniversityJoseph ykHor

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

1Slide2

Table of Content

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS

SouthEast meeting 2009

2

Physics Goal

Relative measurement & disappearance probability

Baseline

& detector design

Sensitivity

Current status, schedule and dates

Background and energy cutSlide3

Physics Goal

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

3

Angra, Brazil

R&D phase

Diablo Canyon, USA

Braidwood, USA

Double Chooz, France

sin

2

2

13

~

0.03

Krasnoyarsk, Russia

Daya Bay, China

sin

2

2

13

~

0.01

8

proposals

4 cancelled

3

in progress

KASKA, Japan

RENO, Korea

sin

2

2

13

~

0.03Slide4

Physics Goal

Determine θ

13 better than any past experiments

θ

23

~ 45

o

θ

12

~ 35

o

Super K + Accelerator

KamLand

+ Solar

+ atmospheric

CP-phase + small

θ

13

DayaBay

Double

Chooz

PMNS Matrix Parameterization:

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

4

Neutrinoless

double beta decaySlide5

Relative measurement & disappearance probability

near detectors measure

e flux and spectrum to

reduce reactor-related systematic uncertainties

far detector

at the oscillation maximumprovides the highest sensitivity

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

5Slide6

Relative measurement & disappearance probability

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 20096

Ratio of measured event rate from far and near site detectors

Ratio of number of protons in

Gd

-LS.

Obtained by mass

flow measurements

Ratio of the detector efficiency

Obtained by calibration

Probability ratio

determine

sin

2

(2

θ

13

)

ν

e

distance L ~

1.8

km

~ 0.4

kmSlide7

Baseline & detector design YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

7

Ling

Ao

II NPP:

2

2.9

GW

th

Ready by 2010-2011

Ling

Ao

NPP:

2

2.9

GW

th

1

GW

th

generates 2 × 10

20



e

per sec

currently running at

11.6 GW one of the top five most powerful by 2011 (17.4 GW

)

Adjacent to mountain, easy to construct tunnels to reach underground labs

with

sufficient overburden to suppress cosmic raysSlide8

Baseline & detector design

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 20098

Deep down the mountain to suppress

cosmogenic

background

Deploy identical detectors in all sites to isolate systematic uncertainties

Optimize baseline distance for disappearance oscillation

Daya

Bay Near site

363 m from

Daya

Bay

Overburden: 98 m

Ling

Ao

Near site

~500 m from Ling

Ao

Overburden: 112 m

Far site

1615 m from Ling

Ao

1985 m from

Daya

Bay

Overburden: 350 m

Slide9

Baseline & detector design

Antineutrino Detector(AD)

Automatic calibration systemTop and bottom reflectors

192 8” PMTs

Three-zone design:

Gd-doped LS, 20 tons

Inner acrylic vessel

LS as Gamma Catcher, 20 tons

Outer acrylic vessel

Mineral oil as buffer, 40 tons

Stainless steel tank

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

9

5 m

5 mSlide10

Baseline & detector design

Muon tagging

Shielding of background radiationRPC as

muon veto on top of water

Cherenkov

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

10

Resistive plate chambers (RPC)

AD

2.5m water shield

8” PMTs

289 PMTs in near site

384 PMTs in far siteSlide11

Sensitivity

sin22θ

13 < 0.008

@ 90% CL

after 3 years of data taking

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

11

0 1 2 3 4 5

0.05

0.04

0.03

0.02

0.01

0.

Number of years of data taking

Sensitivity in sin

2

2

13

(90%CL)

Rapid

convergence

Δ

m

31

2

=2.5 x 10

-3

eV

2Slide12

Sensitivity YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

12

sin

2

2

θ

13

<

0.008

@ 90% CL

after 3 years of data takingSlide13

Current status, schedule and dates YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

13

CD-0 (DOE Mission Need): 11/2005

Daya

Bay proposed at OHEP Briefing 4/2006

Successful Physics Review 10/16/06

CD-1 site selection approved 9/2007

Groundbreaking for civil construction 10/2007

CD-2 & 3a Baseline approved 3/2008

CD-3b Construction start 8/2008

Occupancy of SAB 3/2009

Occupancy of first underground halls

, 2009

Expected start of first operations,

2010

Full operations start,

2011Slide14

Current status, schedule and dates

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

14Slide15

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

15

Current status, schedule and dates

Red indicates current construction progressSlide16

DayaBay experiment

is the most sensitive

θ13

experiment under construction

Specifically designed to achieve the sensitivity of

sin2 (2

θ

13

)

down

to 0.01(goal) at 90% C.L. and 0.008(projected) in three years of data taking

It is now on track to

take

initial data in the

next year and become fully operational in 2 years

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

16

SummarySlide17

The EndThank You

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

17Slide18

Back up

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 200918Slide19

Back up

Accidental coincidence:

natural radioactivity

neutrons from cosmic

muons

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

19

Correlated events:

Fast neutron capture + recoil proton

Beta + neutron decay from Helium & LithiumSlide20

Back up

Energy spectrum of two processes in inverse-beta decay

YuenKeung, Hor Virginia Tech. Daya Bay collaboration APS SouthEast meeting 2009

20

Prompt Energy Signal

1 MeV

8 MeV

6 MeV

10 MeV

Delayed Energy Signal



e

 p 

e

+

+

n

(prompt)

+ p

D

+

(2.2

MeV

)

(delayed)

+ Gd

Gd*

Gd

+

’s

(8 MeV)

(delayed)

0.3b

50,000b