UltracoldNeutron Research at LANSCEneutron.physics.ncsu.edu/LUG2015/UCN_Research... ·...
Transcript of UltracoldNeutron Research at LANSCEneutron.physics.ncsu.edu/LUG2015/UCN_Research... ·...
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Ultracold NeutronResearchatLANSCEBradPlaster,UniversityofKentucky
LANSCEUserGroupMeetingNovember3,2015
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LANSCEUCNSource
OperatingSince2004
ProtonBeam
UCNGuide
ToExperiments
Ultracold Neutrons(UCN)T<340nano‐eVv<8m/s
A.R.Youngetal.,J.Phys.G:Nucl.Part.Phys.41(2014)114007A.Saundersetal,Rev.Sci.Instrum.84(2013)013304A.Saundersetal.,Phys.Lett.B593(2004)55 2
SolidDeuteriumUCNSource
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UCNasaProbeofFundamentalInteractions
Electromagnetic
E B
Strong
Gravity
g
nnn EH ˆVg =mgz
dpn
THe3 pn
S.Burles,K.M.Nollett,andM.S.Turner,astro‐ph/9903300
Weak
J.S.NicoandW.M.Snow,Annu.Rev.Nucl.Part.Sci.55(2005)27H.Abele,Prog.Part.Nucl.Phys.60(2008)1D.Dubbers andM.Schmidt,Rev.Mod.Phys.83(2011)1111 3
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LANSCEUCNSourcePerformance
A.R.Youngetal.,J.Phys.G:Nucl.Part.Phys.41(2014)114007 4
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ManyUsers!
5
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TheUCNScienceProgram
“ReachingfortheHorizon”,The2015LongRangePlanforNuclearSciencehttp://science.energy.gov/~/media/np/nsac/pdf/2015LRP/2015_LRPNS_091815.pdf 6
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TheExperiments
7
UCNB/Nab
NeutronEDM
UCNS
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PrecisionNeutron‐Decay:UCNAσ
n e–
θe
p
e
θp
“V– A”Law
ep
8
“A”
M.P.Mendenhalletal.,PRC87(2013)032501B.Plasteretal.,PRC86(2012)055501
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PrecisionNeutron‐Decay:UCNB,Nab(SNS)σ
n e–
θe
p
e
θp
e
e
EmbBB 0
νp
10.6 xray
481.7 CE 975.7 CE553.8 CE565.8 CE
56.7 CE72.8 xray75.0 xray84.9 xray
1047.8 CE
9
T.Bhattacharyaetal.,PRD85(2012)054512
S.Profumo,M.J.Ramsey‐Musolf,andS.Tulin,PRD75(2007)075107
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PrecisionNeutron‐Decay:UCN
“CounttheLiving”
/0)( teNtN
“CounttheDead”
0N
dtdN
10R.H.Cyburt etal.,arXiv:1505.01076K.Nollett.updateofarXiv:1312.5725
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PrecisionNeutron‐Decay:UCN
P.Walstrom etal,NIMA599 (2009) 82D.J.Salvat etal.,PRC89(2014)052501 11
Magneto‐ GravitationalTrap
Halbacharray
g
steNtN /0)(
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10B UCN Detector
Al Shutter AFP Spin Flipperin 130G (370 kHz)
Trap Door
Polarized UCN from 6T PPM
The UCN Experiment is operational since 2013
UCN Spectrum Cleaner (Polyethylene sheet)
He Drift Tubesnot pictured)
“Fill‐Store‐Count” cycle1. Fill polarized UCN into the trap2. Clean the UCN spectrum3. Store UCN4. Count UCN
B/ZnS UCN detector
V-foil in-situ UCN
detector
Detector R&D:2013: External UCN detector2014‐2015: V‐foil in‐situ UCN detector2015‐2016: 10B/ZnS in‐situ UCN detector
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SourceUpgradeinProgress
13LDRDProject#20140015DR:“ProbingNewSourcesofTime‐ReversalViolationwithNeutronEDM”,T.Ito(PI)
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SourceUpgradeinProgress NeutronEDM
NTEd
1~δ
Figures:“ReachingfortheHorizon”,The2015LongRangePlanforNuclearSciencehttp://science.energy.gov/~/media/np/nsac/pdf/2015LRP/2015_LRPNS_091815.pdf 14
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SourceUpgradeinProgress NeutronEDM
NewEDMExperiment
15
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OtherExcitingOpportunities
z (m)
n =1 n =2 n =3 n =41.4peV 2.5peV 3.3peV 4.1peV
nnn EH ˆVg =mgzg
V.Nesvizhevsky etal.,Nature415 (2002)297T.Jenke etal.,NaturePhys.7 (2011)468A.R.Youngetal. L.J.Broussardetal. 16
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UCNFacility“WishList”
Abilitytorun24/7(beamcurrentlyswitchedfrompRAD)
Abilitytorunwithhigherbeamcurrents
Cryogenicplant(2LHe liquefiers +3compressors)=veryloudenvironment
17
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Summary
BroadscopeofresearchusingUCNaddressingfundamentalproblemsattheforefrontofnuclearphysicsresearch
IacknowledgesupportunderDOEAwardNumberDE‐SC0014622
Largeandactivecommunityofusers
18
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ExtraSlides
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UCNB / Nab Collaborations
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UCNS
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Coldvs.Ultracold
2
ultracold cold fast
MeV0.05–25meV
1– 300KmK
<350neV
T=20K
v2exp(−v2)
Superfluid4He
B.Plaster
p2/2m
dispersioncurve
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4V.Nesvizhevsky etal.,Nature415,297(2002)
GravityandShort‐RangeInteractions
z (m)
n =1 n =2 n =3 n =41.4peV 2.5peV 3.3peV 4.1peV
nnn EH ˆVg =mgzg
B.Plaster
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GravityandShort‐RangeInteractions
5
Spectroscopy
T.Jenke etal.,NaturePhys.7,468(2011)
Epq =Ep – Eq
NewShort‐RangeInteractions:
WeakEquivalencePrinciple:
nnn Emgzdzd
m
2
22
2
Chameleons,Axions,… Neutronsq =0NoEM
backgrounds!
“GravitationalResonanceSpectroscopy”
Casimir,vanderWaals
UCN
pqpq
Eω
B.Plaster
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GravityandShort‐RangeInteractions
6
DarkEnergyChameleonFields
Gravityasapracticaltool…
T.Jenke etal.,PRL112,151105(2014);K.Tullney etal.,PRL111,100801(2013);A.N.Ivanovetal.,PRD87,105013(2013);T.Jenke etal.,arXiv:1208.3875
Axion DarkMatter
torsionpendulum
KE.00006:T.SakutaKE.00007:S.SaibaKE.00008:E.DeesKE.00009:M.Kitaguchi
B.Plaster
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Neutron‐Decay: Lifetime
7
“V– A”Law
Parameters:
2) =gA /gVVud
WhatifthereareScalar, Tensor?
W.MarcianoandA.Sirlin,PRL96,032002(2006);W.Marciano,talkatSantaFeLifetimeWorkshop(2012)B.Plaster
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Lifetime:Techniques
8A.Serebrov etal.,Phys.Lett.B605,72(2005);J.S.Nico etal.,PRC71,055502(2005);A.Yueetal.,PRL111,222501(2013)
“CounttheLiving”
t
N/
0)( teNtN
“CounttheDead”
/0NN
B.Plaster
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Lifetime:BBNandNeff
9A.Coc etal.,arXiv:1403.6694;A.R.Youngetal.,J.Phys.G(inpress)B.Plaster
StandardModel:Neff =3.046
K.Nollett,talkatACFIWorkshopon“MeasuringtheNeutronLifetime”;updateofarXiv:1312.5725
~8s Neff ~0.12
n
n
p
p
YY
73.039.0
BBN
2
eff
eff
eff
eff 04.019.0
NN
NN
CMBBBN
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Lifetime:Beam
10A.Yueetal.,PRL111,22(2013);J.S.Nico etal.,PRC71,055502(2005);F.Wietfeldt talkatACFIWorkshopon“MeasuringtheNeutronLifetime”
BL2ExperimentNIST:n ~1s
200increaseinprotonrate FE.00006:K.MishimaFE.00007:G.TanakaFE.00008:J.MulhollandFE.00011:T.YamadaKE.00010:R.Sakakibara
BL3ExperimentNIST:n <0.3s
B.Plaster
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Lifetime:UCNStorage
11
Material‐wallUCNstorageexperiments
D.Salvat etal.,PRC89,052501(R)(2014)
Next‐generation:(nearly)eliminatewalllosses!
UCN
ED.00008:S.SeestromFE.00004:D.SalvatFE.00005:A.HolleyKE.00011:R.PattieKE.00012:Z.WangME.00013:N.Callahan
B.Plaster
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Neutron‐Decay: AngularCorrelations
12
Differentialdistribution:
EEppD
EpB
EpA
Emb
EEppaEEEp
dEddd
e
e
e
en
e
e
e
eeee
ee
1)( 20
BSM BSM
BSM
νe
e bEmBB 0
20 3λ1)1|λ(||λ|2A
B.Plaster
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Vud
13T.Bhattacharyaetal.,PRD85,054512(2012)
Vud (10–4)
10
20
30
Pion
experiment theory
Superallowed
nucleusdependent EW
Whatisneeded?
Neutron
EW
T=½Mirror
EW
nucleusdependent
a/a,A/A<0.1%
<0.3s
B.Plaster
PDG :
PDG :
4.1ν/χ 2
9.1ν/χ 2
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AngularCorrelations: BSMPhysics
14T.Bhattacharyaetal.,PRD85,054512(2012);S.GardnerandB.Plaster,PRC87,065504(2013)
EEppD
EpB
EpA
Emb
EEppaEEEp
dEddd
e
e
e
en
e
e
e
eeee
ee
1)( 20
νe
e bEmBB 0
“a”,“A”to0.03%+n to…b,b(disentangled)
Neutronsvs.LHC
BP,S.K.L.Sjue,andA.R.Young,inpreparation
FE.00010:K.Hickerson
Nab:b~3 10–3
pp e +X
B.Plaster
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A0
15
FE.00002:M.BrownFE.00003:A.SaundersME.00006:X.Ding
UCNAatLANL
DNPThesisPrize:M.P.Mendenhall
S/B:124
2010:0.94%
2011– 2013
Statistics~0.45%Systematics<0.5%
M.P.Mendenhalletal.PRC87,032501(R)(2013);BPetal.,PRC86,055501(2012)B.Plaster
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a0
16
aCORN atNIST
Courtesy:F.Wietfeldt
2013:~3%
movingtonewguidehall
2015:~1%
B.Plaster
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TheProblemoftheBaryonAsymmetry
17
Howcanthisbe?
Funtidbit:1975NobelPeacePrize!
0
BaryonNumberViolation
CandCPViolation
InteractionsoutofThermalEquilibrium
B.Plaster
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BViolation:n‐n Oscillations
18
Canonicalidea:2 2matrix
2222
2
δ~)(sin)(
δ~)( ttEE
tPn
nn
EE
nn
in
nt
nn EEE δ
D.G.Phillipsetal.,arXiv:1410.1100[hep‐ex];S.GardnerandE.Jafari,arXiv:1408.2264
ILL(1994): >8.6 107 s EuropeanSpallationSource:
1011/s;t~0.1s
58Niguidem~6supermirrorsIncreaseinflightpathGainFactorsof100–1000
But…alsonewidea!nandnofoppositespinsinanexternalmagneticfieldhavesameenergy!
KE.00001:S.Gardner
B.Plaster
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CPViolation:NeutronEDM
19
Sensitivitypermeasurementcycle:
NTEdn
1~δ
ILL:
E~10kV/cmT~130sN~14000density~0.7/cm3
Therefore,for~10–28 e‐cm:
E~5T~4N~25
Minimum:HigherUCNdensities!
ME.00001:M.MakelaME.00002:T.ItoME.00003:E.PierreME.00004:J.Martin
B.Plaster
Stat:1.6 10–26 e‐cm
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WorldwideEffort:~10Experiments
20Tablefrom:B.Filippone etal.,SNSnEDM ExperimentPositionPaper
Differencesinexperimentaltechniques:Measure oraccumulatedphase =t?Magneticfieldmonitoring?“Co‐magnetometer”?UCNproduction/transport?
LANL SolidD2 Vacuum R&D ~30
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SNSnEDM Experiment
21
Stronginteraction
UCN 3He
superfluid4He
8.9Å n
BE
3He
3n
3
n
,BE
,BE
3Hen + p+T
ED.00006:A.ReidED.00007:R.DipertME.00010:C.SwankME.00011:N.NouriME.00012:S.Slutsky
R.Golub andS.K.Lamoreaux,Phys.Rept.237,1(1994)B.Plaster
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Hadronic ParityViolation
22
ParityConserving
B.R.Holstein,J.Phys.G36,104003(2009);J.S.Nico andW.M.Snow,Annu.Rev.Nucl.Part.Sci.55,27(2005)
ParityViolatingWeakCouplings
Wikipedia!
DDH:QuarkModel+SU(6) “DDHReasonableRange”
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Hadronic ParityViolation:NPDGamma
23Courtesy:C.Crawford
pn + d+
θcos141
Add
n k
fA 11.0DDH
KE.00003:D.Blyth
NPDGammaSensitivity:
A ~1 10–8
J.Wasem,PRC85,022501(R)(2012)f =(1.099 0.505 0.061) 10–7
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Hadronic ParityViolation:n‐3He
24
3Hen + p +T
ProtonAsymmetry!
n pp
Single‐WireSpinAsymmetries!
KE.00005:M.McCrea
Courtesy:C.CrawfordB.Plaster