Park Kang SoonSeokyeong Univ.

Status of the RENO

WIN09 @ San Clemente, Pelugia

Sep. 14-19, 2009

New Reactor Neutrino New Reactor Neutrino 1313 Experiment Experiment

Lower background - Improved detector design - Increased overburden

CHOOZ : Rosc = 1.01 ± 2.8% (stat) ± 2.7% (syst)

Larger statistics - More powerful reactors (multi-core) - Larger detection volume - Longer exposure

Smaller experimental errors - Identical multi detectors

→ Obtain ~1% precision !!!

Detection of Reactor

Neutrinos

8MeV30μs

1~8MeV

t

Signal Propertyp

νe

e+

e-

γ(0.511MeV)

γ(0.511MeV)

n

Gd

γ

γ γ

γ

E ~ 8MeV

30μs

prompt signal

Delayed signal

data from CHOOZ hep-ex/0301017v1

(1) 0.7<Eprompot <9MeV (2) 5<Edelayed <11MeV

(3) 1μs<ΔT <200μs

e+ energy n capture energy

Experiments Location

Thermal

Power(GW)

DistancesNear/Far

(m)

DepthNear/Far

(mwe)

Target Mass(tons)

Double-CHOOZ

France 8.7 280/1050 60/300 10/10

RENO Korea 16.4 290/1380 120/450 16/16

Daya Bay China 11.6 360(500)/1985(1613)

260/910 402/80

Comparison of Reactor Neutrino Experiments

RENO CollaborationRENO Collaboration

11 institutions and 40 persons Chonnam National University Dongshin University Gyeongsang National University Kyungpook National University Pusan National University Sejong University Seoul National University Sungkyunkwan University Seokyeong University Institute of Nuclear Research RAS (Russia) Institute of Physical Chemistry and Electrochemistry RAS (Russia) +++ http://neutrino.snu.ac.kr/RENO

Summary of Construction StatusSummary of Construction Status

•03~10, 2007 : Geological survey and tunnel design are completed.

•05, 2008 ~ 02, 2009 : Completion of tunnel construction

•Hamamatsu 10” PMTs have been ordered. (expect to be delivered from Nov. 2009)•SK new electronics are ready.•09, 2009 : Steel containers are ready to be assembled.

•Acrylic containers and mechanical structure are under construction. ( will be done at the end of Nov. 2009 )

•Liquid scintillator handling system is being designed in detail.

•Mock-up detector (~1/10 in volume) is made in Oct. 2008.

Schematic View of Underground FacilitySchematic View of Underground Facility

100m 300m

70m high

200m high

1,380m

290m Far Detector

Near Detector Reactor

s

Design of Tunnels

Experimental hall

Experimental hall

Detector

Win

g

tun

nel(L

)

Wing tunnel(C)

Detector

Win

g

tun

nel(C

)

Construction for the Far Tunnel

(July, 2008) (July, 2008) (Aug, 2008)

(Aug, 2008) (92m)(Sep., 2008)

                                                                                                                                      

그림 1) 원거리 입구 모습

Done !

Construction for the Near Tunnel

(40m)(Oct., 2008)

(90m)(Oct., 2008)

(Sep., 2008)(July, 2008)

Tunnel head(Dec., 2008)

Done !

Construction for Experimental Hall

Done !

RENO Detector

Inner Diameter (cm)

Inner Heigh

t (cm)

Filled with

Mass (tons

)

Target Vesse

l

280 320 Gd(0.1%) + LS

16.5

Gamma catch

er

400 440 LS 30.0

Buffer tank

540 580 Mineral oil

64.4

Veto tank

840 880 water 352.6total ~460 tons

421 PMTs in total

Buffer tankProceeding of construction

by NIVAK Co. Korea

Almost done

Swing method of construction

Cover leak test with water & oil

Buffer

Veto

Acrylic container

Proceeding of construction by KOATECH Co. Korea

It will be completely done at the end of Nov.

Target

Gam

ma c

atc

her

A half of target

Banding acrylic plate

Electronics Use SK new electronics(all hardwares are ready)

Conceptual design of the system

Mockup Detector

Target + Gamma Catcher Acrylic Containers(PMMA: Polymethyl Methacrylate or Plexiglass)

Target Diameter

61 cm

Height 60 cm

Gamma

Catcher

Diameter

120 cm

Height 120 cm

Buffer Diameter

220 cm

Height 220 cm

Buffer Stainless Steel Tank

Mockup Detector Assembly

Being under fine tuning the energy calibration with MC

Gd Loaded Liquid Scintillator

Recipe of Liquid Scintillator :

Aromatic Solvent

Flour WLS Gd-compound

LAB PPO(3g/L)

Bis-MSB(30mg/L)

0.1% Gd+TMHA

(trimethylhexanoic acid)

Optical parameters are checked up.

R&D on LAB(Linear Alkyl Benzene) properties :

CnH2n+1-C6H5 (n=10~14)• High Light Yield : not likely Mineral oil(MO)• replace MO and even Pseudocume(PC)• Good transparency (better than PC)• High Flash point : 147oC (PC : 48oC)• Environmentally friendly (PC : toxic)• Components well known (MO : not well known)• Domestically available: Isu Chemical Ltd.

Raw/MCRaw/MCDataData

ProductionProductionModulesModules

ReconstructionReconstructionModulesModules

UserUserAnalysisAnalysisModulesModules

UserUserntuplesntuples

RACFrameWork

default modules default modules data input and output, database data input and output, database access for run configuration and calibrationaccess for run configuration and calibration

Has Has talk-to functiontalk-to function for changing input parameters for changing input parameters without recompilingwithout recompiling

Addition of modules by userAddition of modules by user

Modules can be set as Modules can be set as filter modulefilter module for selecting for selecting eventsevents

Easy to use and build in RENO software environmentEasy to use and build in RENO software environment

RRENO AAnalysisnalysis CControlontrol

Jμ [cm-2s-1] <Eμ> [GeV]

Far 200 m 8.5×10-5 65.2

Near 70 m 5.5×10-4 34.3

Calculation of Muon Rate at the RENO Underground

Muon intensity at the sea level using modified Gaisser parametrization + MUSIC or Geant4 (the code for propagating muon through rock)

Systematic ErrorsSystematic ErrorsSystematic SourceSystematic Source CHOOZ (%)CHOOZ (%) RENO (%)RENO (%)

Reactor related Reactor related absolute absolute

normalizationnormalization

Reactor antineutrino Reactor antineutrino flux and cross sectionflux and cross section

1.91.9 < 0.1< 0.1

Reactor powerReactor power 0.0.77 < 0.< 0.44

Energy released per Energy released per fissionfission

0.60.6 < 0.1< 0.1

Detector relatedDetector related

H/C ratioH/C ratio 0.80.8 0.0.11

Target massTarget mass 0.30.3 0.10.1

Positron energyPositron energy 0.80.8 0.0.0505

Positron geode distancePositron geode distance 0.10.1 0.00.0

Neutron capture (H/Gd Neutron capture (H/Gd ratio)ratio)

1.01.0 < 0.< 0.33

Capture energy Capture energy containmentcontainment

0.40.4 0.10.1

Neutron geode distanceNeutron geode distance 0.10.1 0.00.0

Neutron delayNeutron delay 0.40.4 0.10.1

Positron-neutron Positron-neutron distancedistance

0.30.3 0.00.0

Neutron multiplicityNeutron multiplicity 0.50.5 0.050.05

combinedcombined 2.72.7 < 0.6< 0.6

Calculation of Background Rates due to RadioactivityConcentration Concentration

4040K (ppb) K (ppb) Concentration Concentration

232232Th (ppb) Th (ppb) Concentration Concentration

238238U (ppb) U (ppb) 4040K [Hz] K [Hz] 232232Th [Hz] Th [Hz] 238238U [Hz] U [Hz]

Total Total [Hz] [Hz]

RockRock 4.33(ppm)4.33(ppm) 7.58(ppm)7.58(ppm) 2.32(ppm)2.32(ppm) 1.061.06 7.147.14 0.990.99 9.199.19

LS in Target LS in Target 0.001 0.001 0.001 0.001 0.001 0.001 0.90 0.90 0.09 0.09 0.26 0.26 1.25 1.25

Target Contatiner Target Contatiner 0.008 0.008 0.05 0.05 0.008 0.008 0.08 0.08 0.06 0.06 0.03 0.03 0.17 0.17

LS in Gamma Catcher LS in Gamma Catcher 0.001 0.001 0.001 0.001 0.001 0.001 1.52 1.52 0.13 0.13 0.38 0.38 2.03 2.03

Gamma Catcher Gamma Catcher Container Container

0.008 0.008 0.05 0.05 0.008 0.008 0.07 0.07 0.04 0.04 0.03 0.03 0.14 0.14

LS in Buffer LS in Buffer 0.001 0.001 0.001 0.001 0.001 0.001 0.08 0.08 ~ 0~ 0 0.03 0.03 0.110.11

Buffer Tank Buffer Tank 0.06 0.06 0.9 0.9 0.9 0.9 0.03 0.03 0.10 0.10 0.20 0.20 0.33 0.33

PMT PMT 13.6 13.6 208.5 208.5 49.4 49.4 2.50 2.50 5.23 5.23 2.99 2.99 10.72 10.72

Total Total ~24~24

RENO Expected Sensitivity

10x better sensitivity than current limit

New!! (full analysis)

GLoBES group workshop@Heidelberg – Mention’s talk

SK m2

Status Report of RENOStatus Report of RENO RENO is suitable for measuring 13 (sin2(213) > 0.02)

RENO is under construction phase.

Geological survey and design of access tunnels & detector cavities are completed → Tunnel construction has been finished in February, 2009.

International collaborators are being invited.

Data –taking is expected to start in mid 2010.