sin VALUE LIMIT IN DOUBLE CHOOZ EXPERIMENT Pi-Jung Chang

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1 sn 3 VALU LIMIT IN DOUBL CHOOZ XPRIMNT P-Jung Chang

2 OUTLIN Dscovry nutrno Nutrno oscllaton Doubl Chooz xprnt Dtctor structur Nutrno sourc Backgrounds Systc uncrtants Uncrtants n Doubl Chooz xprnt Snstvty odls Rcnt work nrgy scal nvronntal ontorng syst Fnal fttng procss Concluson

Rns(956) lctron ant-nutrno fro nuclar ractors p ) 96 uon

3 DISCOVRY NUTRINO Th nutrno was frst postulatd thortcally. Paul ->Bta dcay n 930 M( A, Z) D( A, Z prov by Cowan and Rns(956) lctron ant-nutrno fro nuclar ractors p ) 96 uon nutrnos (Danby t al 96) 975 tau lpton-> tau nutrnos(kodaa t al 00) n

4 NUTRINO OSCILLATION Thr known flavor nutrnos fro W boson dcays W W μ W τ Nutrno Flavor Chang If nutrno has asss and lptons x. W μ L dstanc τ dtctor Nutrno Phnonology Facts, and Quston Bors Kaysr 009 nutrno sur school

5 NUTRINO OSCILLATION Lnar suprpostons of ass gnstats l=,τ,μ ; =3,4. Wak gnstats, ass gnstats, lptonc xng atrx, at last =3 ass gnstats. Probablty l l U, l l U, 3 (Mass)^ l l l L l L l l L pl t U U U L t ' * ', ) / (, ) / (, ) / ( ) ( j j j j j j j j j j L l l l l U U U U K L L K L K U U L P * *, 3, ) ( 3, / * ',, ) ( ' ) ( 4 cos 4 sn I 4 4 sn R 4 ) ) ( ( Ractor-basd Nutrno Oscllaton xprnts Carlo Bporad t al.

6 NUTRINO OSCILLATION Th Mxng Matrx U 0 0 c 3 0 s3 c s U 0 c3 s3 0 0 s c 0 s 0 3 c3 s3 c3 0 0 c j Atosphrc Cross-Mxng Solar cos j, sj snj, ~ sol, 3 ~ at δ would lad to P P. CP volaton CP volaton dsappars : sn Nutrno Phnonology Facts, and Quston Bors Kaysr 009 nutrno sur school

7 RACTOR NUTRINO XPRIMNTS PROPRTIS -> bta dcay of th nutron-rch fsson fragnt nrgy s low(fw MV)-> only dsapparanc Flux->larg sold angl and low sgnal rats Thr s no ba algnnt probl L dstanc Ractor-basd Nutrno Oscllaton xprnt Carlo Bporad t al.. Nutrno Physcs Ka Zubr.

8 RACTOR XPRIMNTS Ractor nutrno xprnt 4 L P cos sn sn sn 3 cos 3 sn 3L 4 3L sn 3sn 4 Dosn t dpnd on th δ-cp phas sn Short basln xprnt xprntal data at.40,sn 3 V, sol sn 3L sn 4 Chooz data 3 3 Fundantals of Nutrno Physcs and Astrophyscs Carlo Gunt and Chung W. K 4 0.8,sn V 0. sn 3 at sol

9 LOCATION

10 Introducton Doubl CHOOZ Antnutrno flux th two nuclar cors of th Chooz powr plant rsults fro β dcay of th fsson products of four an sotops 35 U, 39 Pu, 4 Pu and 38 U. p n.0 k 40. k

11 Dtctor structur vto p targt n buffr γcatchr Scntllator (targt): Proton -> 0% PX(C 6 H 8 ), 80% of dodcan(c H 6 ), sall aount gadolnu Nutron captur -> sall aount gadolnu Γ catchr: p th sa optcal proprts as targt. gt th full postron annhlaton nrgy. ost of th nutron nrgy rlasd aftr nutron captur. n PMT

12 Dtctor structur Buffr (stanlss stl and PMT support, nral ol ): γcatchr rduc th sngl rat n targt and gaa catchr. Lowr th postron thrshold down to 500kV vto targt buffr Innr vto (nral ol): uon taggng and fast nutron background rjcton. achv a lght yld about 00 p/mv PMT Total PMT nubr 468 for ach.

13 XPRIMNTAL MTHOD p Postron : dposts kntc nrgy -> scntllaton lght and annhlaton.. 93 Nutrno MV Nutron capturs on hydrogn n p d. 3MV Nutron captur on Gd n Gd n Gd * n... 8MV Two nrgy nd to b corrlatd n t and spac->nutrno vnts

14 ANTINUTRINO VNTS PRDICTIONS Spctru fro sourc β dcay U n Zr C n lctron spctra assocatd wth th thral nutron -> spctra. dn d dn d Ractor-basd Nutrno Oscllaton xprnts Carlo Bporad t al.

15 ANTINUTRINO VNTS PRDICTIONS(NO OSCILLATION) Antnutrno cross-scton on proton fsson c Nubr of fsson pr scond(pth~4.7gwth,w~03.87mv) 8 N 6.40 sc P MW W MV f th / Antnutrno vnts rat N f n fsson p RL 60vnts / day 4L

16 N ANTINUTRINO VNTS PRDICTIONS(OSCILLATION) F 0 S F: noralzaton factor S:nrgy rsoluton ffct 3, cross scton for nvrs β- p 5 dcay f n φ: antnutrno flux, ', L P, L d d' P: antnutrno flux survval probablty

17 000DAYS MC NUTRINO SPCTRUM

18 BACKGROUNDS Intracton dposts at lastmv and 8MV nutron captur n gadolnu. Background -> nutron lk vnts Into t wndow(fw 00 μs) Ovr MV Bta and gaa background U, Th and K fro scntllator ass, acrylc vssls, photoultplr and structur atral.(>mv) 08 Tl n buffr rgon.6mv gaa sson.

19 NUTRON BACKGROUND: NUTRON LIK VNTS xtrnal cosc uons Through gong uons -> spallaton procss statd by uon fluxs, an nrgs and shldng factors Stoppd ngatv uons ->capturd by nucl n targt statd by dpth of shldng, μ-lf t and μ-captur ts. μ μ vto 8MV p n p n buffr Γ catchr + p n targt

20 Bta-nutron cascads 8 Muon spallaton on C H dcay wth a nutron sson 9, L, undrgo bta Uncorrlatd uon vnts: on vnt pr day for far and 9~3 vnts pr day for nar. L

21 XPRIMNT SYSTMATIC UNCRTAINTIS Man rrors of CHOOZ Antnutrno flux and spctru(.9%) Cross scton of nutrnos on th targt protons.(0.8% nubr of protons, dtctor ffcncy.5%) CHOOZ total rror.7%->doubl CHOOZ rducs to 0.6%. rduc th systatc rrors and background. Two dntcal dtctors ->nglgbl ractor flux and cross scton of nutrnos on th targt protons.

22 ANALYSIS CUTS TO SLCT TH ANTINUTRINO 7 analyss cuts (CHOOZ)-> 3 analyss cuts Rduc analyss cuts -> rduc uncrtanty Propt postron sgnal nrgy cut at 500kV and 00μs.(Antnutrno ntracton last MV) Nutron dlayd sgnal, cut at 6MV Nutron captur on hydrogn at.mv Nutron captur on gadolnuat 8MV nutron captur on gadolnu s lss than 00μs. Propt and dlay vnt dstanc.()

23 OTHR UNCRTAINTIS Sold angl Dstanc btwn ractors and dtctors.(kp blow 0.%) Uncrtanty on th scntllator dnsty W nd to know th ass of th targt to <0.%. Nutron ffcncy(capturd by H and Gd) CHOOZ Doubl CHOOZ Ractor powr 0.7% Nglgbl nrgy pr fsson 0.6% Nglgbl Antnutrno/Fsson 0.% Nglgbl Nutrno cross scton 0.% Nglgbl Nubr of protons/c3 0.8% 0.% Nutron t captur 0.4% Nglgbl Nutron ffcncy 0.85% 0.% Nutron nrgy cut 0.4% 0.%

24 SNSITIVITY Last squars Mnzaton t p r skk : asurnt of data-background, t: th odl prdcton, σ: th uncorrlatd (statstcal)rror, Δ:corrlatd(systatc rror) fro sourc k. Probablty dnsty functon of asurnts P C xp, k j t V t j, V Corrlatd : thortcal cross scton of dtctor, ractor fluxs( spctru of antnutrno flux) Uncorrlatd: proton nubrs, basln lngths, a part of dtctor ffcncy, background.. j j j j k k jk

25 SNSITIVITY MODLS on dtctor on ractors odl For : Systatc lt on n nutrno oscllaton xprnts wth ult-ractor H. Sugyaa t al. 4, 4 sn sn / u r c r u c u r c r u c u r c r u c V L t t V t ' 4 sn, ', 4 sn 0 d d L L S F L 3 sn

26 SNSITIVITY MODLS two dtctor on ractor odl For : Systatc lt on n nutrno oscllaton xprnts wth ult-ractor H. Sugyaa t al. 4 4 sn 4 sn sn / / / /, u n f u f f n n u r c r u c f f n n f f n n f f n n L L t t t t t t V t t 3 sn

SNSITIVITY OF sn 3(ON DTCTOR VS. TWO DTCTOR ON RACTOR MODL) 00days MC data, 0.6 3 3.

27 SNSITIVITY OF sn 3(ON DTCTOR VS. TWO DTCTOR ON RACTOR MODL) 00days MC data, V.7 90% C.L. 70% C.L. Two dtctor 0.0~ ~0.009 On dtctor 0.0~ ~0.04

28 Rcnt work: nrgy scal To rconstruct th convrson functon btwn a asurabl dtctor quantty and nrgy. procsss Th nrgy of asurd partcls Qunchng of th scntllaton lght Crnkov lght vsbl ral SQ K, C P A prcs dtrnaton of th Kaland nrgy scal Tothy M. Classn thss. b

29 Scntllator Solvnts 0% PX(C 6 H 8 ) :collct nrgy, conduct nrgy to fluor. 80% of dodcan(c H 6 ): prov th chcal copatblty wth th acrylc, ncras th nubr of fr protons. ( 0.3~% ) Fluor Prary-> PPO(sson λ 357 n): abl to b xctd to a lght ttng stat by xctd solvnt olculs. Scondary-> Bs-MSB(sson λ 40 n): wavlngth shftr.

30 IONIZATION QUNCHING Whn a larg aount of nrgy s dpostd n a sall ara, so of olculs n scnllator wll shd thr xcss nrgy thrally through a qunchd nrgy. Brks Law vsbl ral S ral 0 d d Kb dx Kb s Brks constant, S scntllaton ffcncy, s partcl nrgy, and x s th rang n scntllator. c Sulaton by MC A prcs dtrnaton of th Kaland nrgy scal Tothy M. Classn thss.

31 Crnkov lght Crnkov radaton s producd whnvr a chargd partcl s travlng fastr than th local spd of lght. d N dxd z n( ) N s nubr of photons, x s track lngth, α s th fn structur constant and z s th partcl s charg. Th lght wll absorb by PX and rt by fluor

32 QUNCH AND CRNKOV LIGHT FLUX IN DTCTOR Only Qunch lght Only Crnkov lght

33 NRGY SCAL WORK Qunch th qunchng bnch asurnts->valus of Brk's paratr Kb for MC. Calbraton sourc natural alpha sourcs-> produc no Crnkov lght. Copar calbraton data->adjust Kb constants. Crnkov lght Calbratd by Copton scattrng

34 RCNT WORK: NVIRONMNTAL MONITORING Slowon syst, nvronntal ontorng syst nstallaton s don n far dtctor. nvronntal ontorng syst, Control systatc ffcts and Provd alars, warnngs, dagnostcs Dtctd ts: tpratur, agntc fld around PMT, voltag valus of Front-nd boards and hall and control roo tpratur and hudty.

36 BMON_3~0 (z>=500) BMON_4(z=000) BMON_5(z=500) BMON_6(z=0) BMON_7(z=-500) BMON_8(z=-000) BMON_9(z=-500) BMON_0(botto) BMON_(botto)

37 Buffr tank thral trs data fro /5~/9-83.4, ph4.6 Buffr , ph 86.3 Buffr -500., ph-66. Buffr -000., ph-50. Buffr

38 MAGNTIC FILD IN BUFFR TANK FROM /~9/

39 RCNT PROCSS Tpratur Auto-warnng syst s don n lab Fllng procss (spcal targt tank)dpnd on th tpratur changng n th tanks. Magntc ontorng s provd workng wll n IV ld opn prod. IV and Buffr thral data-> thral odl of dtctor-> proton nubr.

40 FINAL FITTING PROCSS Constructng a Covaranc Matrx Paratrs dtrnd drctly fro calb. Data Paratrs should b sultanously vard n MC to atch calb. Data k jk k j j j j j j V t V t C P,, xp

41 CONCLUSION 3 ass gnstat odl s th splst odl to xplan thr flavor nutrno oscllaton Ractor nutrno xprnt advantags Dosn t dpnd on th δ-cp phas Unfor antnutrno flux no CP f sn 3 0 Doubl Chooz xprnt Nar dtctor-> ras snstvty fro Snstvty odls sn ~ 0.05 Buffr rang -> rduc background and thrshold nrgy

42 CONCLUSION Rcnt work nvronntal ontorng Hardwar and databas ar don Thral nforaton analyss for fllng syst Warnng syst Thral odl of dtctor-> nubr of protons n dtctor nrgy scal and fnal fttng Paratrs dtrnd drctly fro calb. Data Constructng a Covaranc Matrx

43 RFRNC Doubl Chooz: A Sarch for th Nutrno Mxng Angl θ3 F. Ardllr t al. Lttr of Intnt for Doubl-CHOOZ: a Sarch for th Mxng Angl θ3 F. Ardllr t al. Ractor-basd Nutrno Oscllaton xprnts Carlo Bporad t al. arxv:hp-hp/00777 v Systatc lt on sn 3 n nutrno oscllaton xprnts wth ult-ractor H. Sugyaa t al. rror stats on Parton Dnsty Dstrbutons M Botj t al. A prcs dtrnaton of th Kaland nrgy scal Tothy M. Classn thss. Nutrno Phnonology Facts, and Quston Bors Kaysr 009 nutrno sur school

44 SYSTMATIC RRORS Global noralzaton rror: uncrtanty of antnutrno flux and dtctor cross scton(no pact) Rlatv noralzaton rror: xprnt rror, uncrtants on th dtctor dsgn and vnt slct cuts. Spctral shap rror: antnutrno spctru shap ->th nrgy bn w tak. nrgy scal: nrgy scal calbraton uncrtanty of vsbl nrgy(sn n th dtctor) Background subtracton stp: only on uncorrlatd rror rror typ Global noralzaton % Rlatv noralzaton 0.6% Spctru shap % nrgy scal 0.5% background 0.5%

45 RACTOR NUTRINO XPRIMNT PROPRTIS flux and cross scton Nutrno snstvty Ractor-basd Nutrno Oscllaton xprnt Carlo Bporad t al.

46 MUON SPALLATION AND PHOTO- ABSORPTION spallaton Photo-absorpton μ γ n,π γ n,π N N N N

47 CROSS SCTION FOR NUTRINO ABSORPTION Racton rat cross scton cross scton d v Vq V d d d JN dw f f f f f r r 3 8,, p n n p 3 3 c p c p G c d d f F 3 c p G c d d f F u p d u d n d u n d d u W p u d u W

48 CONFIDNC INTRVAL 90%=.8σ 68.7%~ σ α δ σ 0..8σ 0..64σ σ σ σ δ σ Fro: Rvsd Sptbr 009 by G. Cowan (RHUL).

49 TH MTHOD OF LAST SQUARS LS stator ->nu of Ch^ s qual to zro->ls stators t V t T N k j jk k j T T T T j j j V x h g H V H DVD U Ug D V H H V H x h x t, ; ˆ ; ; Fro: Rvsd Sptbr 009 by G. Cowan (RHUL).

50 MONT CARLO TCHNIQUS Sapl rando varabls govrnd by coplcatd probablty dnsty functon F(x) s a unfor dstrbuton (0,) f(x) dsrd probablty dnsty functon. u x F F x u Rvsd Sptbr 009 by G. Cowan (RHUL).

Neutrinos. Overview. Pauli postulates Neutrino Discovery of neutrino flavours. Neutrino Interactions. Neutrino mass. Neutrino oscillations

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