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Canada’s national laboratory for particle and nuclear physics and accelerator-based science
Experience with GRIFFIN Adam Garnsworthy ARIEL Principal Scientist and TRIUMF Research Scientist FRIB Decay Station Workshop 25-26th January 2018
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Yield Chart of Nuclides
ISAC rare isotope facility
Isotopes delivered at ISAC (P.Kunz, Updated June 2016)
Target materials: SiC, TiC, NiO, Nb, ZrC, Ta, U Ion sources: Surface, FEBIAD, IG-LIS
TRIUMF-ISACIsotopeSeparatorandACcelerator
1 RIB delivery to experiments
SiC,NiO,Nb,ZrC,Ta,UCxTargetsSurface,FEBIAD,IG-LISionsources
500MeVp+at100μAonISOLtarget
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Yield Chart of Nuclides
Cyclotron
ISAC
ISAC
ISAC-I Low-Energy <60keV Ground state + decay, material science ISAC-I Medium E <1.5MeV/u Astrophysics ISAC-II SC LINAC <10MeV/u Nuclear reactions and structure 26Jan2018 FRIBdecaystaPonworkshop
3
ARIEL Project: § newelectronlinacdriverforphoto-fission§ new target stations and front end § newprotonbeamline
TRIUMF-ARIELAdvancedRare-IsotopELaboratory
E-linacandelectronbeamlineSept.2014
1 RIB è 3 simultaneous RIBs
Cyclotron
ISAC
e-linac
ISACARIELIARIELII
26Jan2018 FRIBdecaystaPonworkshop 4
500MeV Protons on UCx
Photo-fission of UCx
Rare-isotopebeamswillbeproducedbyfromprotonand
electrondriverbeams.
ARIEL beams to ISAC experiments
26Jan2018 FRIBdecaystaPonworkshop 5
ARIEL Completion to Science 1999 Low-energyISACbeams
10/2019 ISAC-CANREB-ISACbeams
03/2022 ARIELbeamtoβ-NMR
06/2022 ARIELphoto-fissionbeamstoISAC
03/2023 ARIELspallaPonbeamstoISAC
26 Jan 2018 FRIB decay station workshop 6
The 8π Spectrometer
PerformeddecayspectroscopyatTRIUMF-ISAC-Ifrom2000to2013
Researchersfrom24insPtuPonsfrom8countries.25post-docs,5PhD,12MSc,1MPhysSeveralGrad.StudentssPllinprogress26 Jan 2018 FRIB decay station workshop 7
The 8π Spectrometer at TRIUMF-ISAC
11Li beta-delayed neutron emission C.M. Mattoon et al., PRC 80, 034318 (2009) F. Sarazin et al., PRC 70, 031302 (2004)
High-statistics studies of Cd, Sn, Xe B. Jigmeddorj et al., Eur. Phys. J. A 52, 36 (2016). B.Jigmeddorj,et al., EPJWebConf.107,03014(2016). A.J. Radich et al., PRC 91, 044320 (2015) P.E. Garrett et al., PRC 86, 044304 (2012) P.E. Garrett et al., Acta Phys.Pol. B42, 799 (2011) P.E. Garrett et al., AIP Conf.Proc. 1377, 211 (2011) K.L. Green et al., PRC 80, 032502 (2009)
Island of inversion, 32Mg C.M. Mattoon et al., PRC 75, 017302 (2007)
Isomer decay in 174Tm, 178Hf, 179Lu R.S. Chakrawarthy et al., PRC 73, 024306 (2006) R.S. Chakrawarthy et al., EPJ. A 25, S1, 125 (2005) M.B. Smith et al., NPA746, 617c (2004) M.B. Smith et al., PRC 68, 031302 (2003)
Shape coexistence in neutron-rich Sr, Zr J. Park et al., PRC 93, 025802 (2016). A. Chakraborty et al., PRL 110, 022504 (2013)
Half Life of geochronometer, 176Lu G.F. Grinyer et al., PRC 67, 014302 (2003)
Technical and Overview Publications A.B.Garnsworthy, EPJ Web of Conf.s 93, 01032 (2015) P.E. Garrett et al., J. of Phys. Conf. Series 639, 012006 (2015). A.B. Garnsworthy and P.E. Garrett, Hyp. Int. 225, 121 (2014) G.C. Ball et al., J.Phys.:Conf.Ser. 387, 012014 (2012) D S Cross et al., JINST 6, P08008 (2011) P.E. Garrett et al., NIM Phys.Res. B261, 1084 (2007) G.C. Ball et al., J.Phys.(London) G31, S1491 (2005) S.J. Williams et al., J.Phys.(London) G31, S1979 (2005) C.E. Svensson et al., NIM Phys. Res. B204, 660 (2003)
Large Beta-Delayed neutron branching ratio observed from 102Rb Z.M.Wang et al., PRC 93, 054301 (2016).
Superallowed/Mirror Beta Decay 10C, 14O,18Ne, 19Ne, 26mAl, 38mK, 62Ga, 74Rb M.R.Dunlopetal,PRL.116,172501(2016).A.T. Laffoley et al., PRC 92, 025502 (2015) G.C. Ball, Hyp. Int 225, 133 (2014) R. Dunlop et al., PRC 88, 045501 (2013) G.F. Grinyer et al., PRC 87, 045502 (2013) A.T. Laffoley et al., PRC 88, 015501 (2013) P. Finlay et al., PRC 85, 055501 (2012) S. Triambak et al., PRL 109, 042301 (2012) P. Finlay et al, PRL 106, 032501 (2011) G.F. Grinyer et al., NIM A622, 236 (2010) P. Finlay et al., PRC 78, 025502 (2008) K.G. Leach et al., PRL 100, 192504 (2008) G.F. Grinyer et al., PRC 77, 015501 (2008) G.F. Grinyer et al., PRC 76, 025503 (2007) G.F. Grinyer et al., NIM A579, 1005 (2007) E.F. Zganyar et al., Acta Phys.Pol. B38, 1179 (2007) B. Hyland et al., PRL. 97, 102501 (2006) B. Hyland et al., AIP Conf.Proc. 819, 105 (2006) B. Hyland et al., J. Phys. G31, S1885 (2005) G.F. Grinyer et al., PRC 71, 044309 (2005) A. Piechaczek et al., PRC 67, 051305 (2003)
FRIB decay station workshop 8
GRIFFIN Timeline
StructureFabricaPonandProcurement Assembly InstallaPoninISAC
April2015Oct2012 Oct2014April2014April2013 Oct2013
8piOperaPon GRIFFINOperaPonGRIFFINInstallaPon
PrototypingandDevelopment FirmwareandDAQDevelopmentFabricaPonofProducPon
models
Receivefirst8Clovers Receiveanother4Clovers Acceptall16Clovers
ExperimentalHallPreparaPon InstallaPonofBeamlineandElectronicsShack
InstallaUonin2014,CommissioningrunsinFall2014,CompleUoninMay2015
PhaseTwo:SuppressionShields(CAD$3.57M).June2016–May2018
PhaseOne:Infrastructure+HPGe(CAD$8.7M).Oct2012–April2015
GRIFFIN Installation in 2014 Jan Feb Apr
May
July
FirstRIB24thSept2014
10 26 Jan 2018 FRIB decay station workshop
Dec2013,8pi
GRIFFIN Footprint
Supportstructure:5.2mx1.8m2.7mtallElectronicsShack:4.2mx2.1m3.2mtallTotalarea:9mx9m
26 Jan 2018 FRIB decay station workshop 11
GRIFFIN HPGe Clover Detectors
TesPngperformedatSFUDec2012 4AcceptedApril2013 8AcceptedJan2014 9AcceptedMay2014 13AcceptedOct2014 16Accepted6monthsaheadofschedule
AveragePerformanceofall64crystals(16clovers):EnergyresoluPon@121keV= 1.12(6)keVEnergyresoluPon@1.3MeV=1.89(6)keVPhoto-peakRel.Eff.@1.3MeV= 41(1)%
1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3Energy Resolution at 1.3 MeV (keV)
37.0
38.0
39.0
40.0
41.0
42.0
43.0
44.0
45.0
Rel
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e Ef
ficie
ncy
(%)
Average of all 64 Crystals
Minimum Acceptable Efficiency
Max
imum
Acc
epta
ble
Res
olut
ion
U.Rizwanetal.,NIMA820,126(2016).
Aclose-packedarrayof16large-volumeHPGeCloverdetectors,64crystals
GRIFFIN HPGe Clover Detectors
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olut
e Pho
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ak E
ffici
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Summed NeighboursClover DetectorsSingle Crystals8pi Spectrometer
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opea
k-to
-Tot
al R
atio
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100 1000 10000γ-ray Energy (keV)
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back
Fac
tor
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60Ef
ficie
ncy
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, GRI
FFIN
/8pi
a) b)
c) d)
4096crystalpairsat52uniqueanglesforγ-γangularcorrelaPons
0
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ak E
ffici
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100 1000 10000γ-ray Energy (keV)
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ienc
y Ra
tio, G
RIFF
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a) b)
c) d)0
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otop
eak
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ienc
y (%
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Summed NeighboursClover DetectorsSingle Crystals8pi Spectrometer
0
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opea
k-to
-Tot
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atio
(%)
100 1000 10000γ-ray Energy (keV)
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ddba
ck F
acto
r
100 1000 10000γ-ray Energy (keV)
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ienc
y R
atio
, GR
IFFI
N/8
pi
a) b)
c) d)
26 Jan 2018 FRIB decay station workshop 13
Low-Energy Thresholds
26Jan2018 FRIBdecaystaPonworkshop
Energy (keV)0 20 40 60 80 100 120 140
Co
un
ts p
er
0.2
4 k
eV
210
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510
121 keVSm X rays
Ge X rays
Escape peak
SingleGRIFFINHPGewith152EusourceFWHM=1.072(1)keV@121keV
14
Gamma-Gamma Angular Correlation Analysis
J.K.Smith,A.C.MacLeanetal.Inprepara>onforNIMA(2018).Developmentofγ-γangularcorrelaPonanalysistechniqueswithGRIFFIN.• Finitesizeandshapeofcrystalsmeans
theorePcaldistribuPonisamenuated.• Obtain‘template’fromhigh-staPsPcs
GEANT4simulaPon• Fittemplatetoexperimentaldata.
Ideally:• Fitexperimentaldata• PlugcoefficientsintosimpleequaPons• Obtaincorrected‘true’coefficients
θcos 1− 0.5− 0 0.5 1
Resid
ual
0.1−
0
0.1(b)
Nor
mal
ized
cou
nts
0.5
1
1.5
(a)Filledcircles=DataDomed=TheoryDashed=GEANT4
0+-2+-0+(pureE2)in62Zn
Compton Polarimetry using GRIFFIN
26 Jan 2018 FRIB decay station workshop 16
DefinePolarizaPonplanefromγ-γcoincidencedetecPon.ThenexamineazimuthalscameringangletodetermineelectricormagnePcnatureoftheradiaPon.
DanSouthall,TRIUMFresearchstudent,2016
)° (ξAzimuthal Compton Scattering Angle 0 10 20 30 40 50 60 70 80 90
)ξAs
ymm
etry
A(
0.08−
0.06−
0.04−
0.02−
00.020.040.060.08
(a)
)° (ξAzimuthal Compton Scattering Angle 0 10 20 30 40 50 60 70 80 90
)ξAs
ymm
etry
A(
0.08−
0.06−
0.04−
0.02−
00.020.040.060.08
(b)
207Bi567keVE2
207Bi1064keVM4
Compton Polarimetry using GRIFFIN
26 Jan 2018 FRIB decay station workshop 17
DefinePolarizaPonplanefromγ-γcoincidencedetecPon.ThenexamineazimuthalscameringangletodetermineelectricormagnePcnatureoftheradiaPon.
DanSouthall,TRIUMFresearchstudent,2016
)° (ξAzimuthal Compton Scattering Angle 0 10 20 30 40 50 60 70 80 90
)ξAs
ymm
etry
A(
0.08−
0.06−
0.04−
0.02−
00.020.040.060.08
(a)
)° (ξAzimuthal Compton Scattering Angle 0 10 20 30 40 50 60 70 80 90
)ξAs
ymm
etry
A(
0.08−
0.06−
0.04−
0.02−
00.020.040.060.08
(b)
207Bi567keVE2
207Bi1064keVM4
GRIFFIN Compton and Background Suppression Shields
18
GRIFFINHPGeBGOSet1atSFU
GRIFFINancillary-detectorBGOshield#1
• FirstSuppressionshieldsetshavebeenaccepted(March2017)!• AllperformanceacceptancetesPngcompletedatSFU
(KennethWhitmore,KevinOrtner,CorinaAndreoiu)• MechanicalcheckscompletedatTRIUMF.
• HPGe5setsaccepted.AllsetsexpectedbyMay2018.• Ancil.Det.setsexpectedbyApril2018.
26 Jan 2018 FRIB decay station workshop
GRIFFIN Compton and Background Suppression Shields
19 26 Jan 2018 FRIB decay station workshop
LaBr3shield
HPGeat11cm HPGeat14.5cm
SCEPTAR - SCintillating Electron-Positron Tagging ARray
26Jan2018 FRIBdecaystaPonworkshop
Energy (keV)1500 2000 2500 3000 3500 4000 4500
Cou
nts
/ keV
0
5000
10000
15000
HPGe
Beta-gated HPGe
132Inè132SnS1519,July2016
• Twohemispheresof10plasPcscinPllators
• DetectsbetaparPcleswith~80%solidanglecoverage
• Improvespeak-to-backgroundofHPGespectra
• Reducesrandombackgroundby~5ordersofmagnitude
20
PACES - Pentagonal Array for Conversion Electron Spectroscopy
26Jan2018 FRIBdecaystaPonworkshop
Five5mmthick,200mm2Si(Li),LN2-cooledSidiodeandFETSolidanglecoverage:1.4%each,7%total~2keVresoluPonforelectrons
J.Parketal.,PRC96,014315(2016).
Alpha-tagging
21
Gamma-Electron Angular correlations
0
175
544
3-
7+
2-198mTl
175keVM1ICE
283keVM4Gamma
300Ge-Si(Li)pairsat18uniqueanglesforγ-e-angularcorrelaPons
26Jan2018 FRIBdecaystaPonworkshop 22
LaBr3 Fast-Scintillator Array for Excited-State Lifetime Measurements
26Jan2018 FRIBdecaystaPonworkshop
• EightLaBr3(Ce)2”x2”cylindricalcrystal
• Source-detectordistance=12.5cm.
• GEANT4simulatedefficiency1.4%@1.3MeV
• Hybridanalogue+digitalelectronics,excellentPmeresoluPon
• EffortledbyBrunoOlaizola
T1/2for2+1statein146BaGRIFFIN:840(20)psLiterature:860(30)ps
Preliminary
146Csβdecay:GRIFFIN+DESCANT+LaBr3August2016
23
GRIFFIN+DESCANT
26Jan2018 FRIBdecaystaPonworkshop
• 70elementarrayofdeuteratedscinPllatorforneutrondetecPon• Enablesbeta-gamma-ICE-neutronspectroscopy• ~1πsolidangle• NeutronenergyfromPme-of-flight(50cmflightpath)• Onlineneutron-gammadiscriminaPonfrompulseshape
GRIFFIN+DESCANT,August2016
24
GRIFFIN Ancillary Detectors
Fast, in-vacuum tape system Enhances decay of interest
SCEPTAR: 10+10 plastic scintillators
Detects beta decays and determines branching ratios
Zero-Degree Fast scintillator Fast-timing signal for betas
PACES: 5 Cooled Si(Li)s Detects Internal Conversion Electrons and alphas/protons
HPGe: 16 Clovers Detect gamma rays and
determines branching ratios, multipolarities and mixing ratios
LaBr3: 8 LaBr3 Fast-timing of photons to measure level lifetimes
JπGS
JπISOMER
ISOBAR
T1/2
T1/2 Longer T1/2 Shorter
E,Jπ τ E,Jπ τ
γ γ e-
α,p
β
β
γ e-
γ γ γ
β
n
DESCANT Neutron array Detects neutrons to measure beta-delayed neutron branching ratios
β
β
GRIFFINreusesthefullsuiteofancillary
detectorsdevelopedforthe8πspectrometer
26 Jan 2018 FRIB decay station workshop 25
GRIFFIN DAQ System
26Jan2018 FRIBdecaystaPonworkshop
CustomDigitalElectronicsModulesdesignedandbuiltbyTRIUMFandUniversitédeMontréal
Highdatathrough-put:Eachcrystalrunningat50kHz
300MB/soffiltereddata,1TBperhour≈5x109gamma-gammacoincidences/hour…toenableultra-high-sta>s>csstudies
Highaccountability:AccuratedeadPmeknowledge
Pile-uphandlingEventtraceabilityfromthresholdcrossingtodisk
…toenablehigh-precisionhalf-life/BRmeasurements
26
GRIFFIN DAQ System
26Jan2018 FRIBdecaystaPonworkshop
CustomDigitalElectronicsModulesdesignedandbuiltbyTRIUMFandUniversitédeMontréal
MasterandCollectorModule
• 625MB/slinktoeachdigiPzer
• 1.25Gb/slinktodatastorage.
GRIF-16Module
GRIF-4GModule
ClockDistribuUonModule
10MHzAtomicClockLow-jimerfan-outtoallmodules
ProgrammableLogicPulseGenerator
32ChannelsNIMorTTL
4chans1GHz,12bit
16chans100MHz,14bit
27
Excellent Energy Resolution with GRIFFIN Digital DAQ
26Jan2018 FRIBdecaystaPonworkshop
s)µIntegration Length (0 2 4 6 8 10
FW
HM
(ke
V)
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6SingleGRIFFINHPGewith60Co,~0.3kHz
FWHM=1.87(1)keV@1332keV
0.195%0.188%0.180%0.173%0.165%0.158%0.150%0.143%0.135%0.128%
28
High counting rates
26 Jan 2018 FRIB decay station workshop 29
Count rate (kHz)
0 20 40 60 80
Ener
gy R
esol
utio
n (k
eV)
2
3
4
5(a)
Count rate (kHz)
10 20 30 40 50
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ncid
ent T
imin
g R
esol
utio
n (n
s)
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40
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80
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Count rate (kHz)
10 20 30 40 50
Peak
-to-to
tal r
atio
0.10
0.11
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0.13
0.14
0.15
0.16
(c)
all interactions
no pile-up
Energy (keV)
0 500 1000 1500 2000 2500 3000
Nor
mal
ised
cou
nts
1
10
210
310
410
510
(a)
1.1 kHz
62.4 kHz
Energy (keV)
0 500 1000 1500 2000 2500 3000
Nor
mal
ised
cou
nts
1
10
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410
510
(b)
1.1 kHz
62.4 kHz
“Pile-upreject”
Allhits
Count rate (kHz)10 15 20 25 30 35 40 45 50
Rel
ativ
e Ef
ficie
ncy
0.4
0.5
0.6
0.7
0.8
0.9
1.0
all interactions
no pile-up
The GRIFFIN Spectrometer for precision decay studies at ISAC
31,32Na:Islandofinversion
115,115mAg:Equilibriumof115,115mCdduringthes-process
TechnicalandOverviewPublicaPonsA.B.Garnsworthyetal.,NIMA853,85(2017).U.Rizwanetal.,NIMA820,126(2016).A.B.Garnsworthy,ActaPhys.Pol.B,47,713(2016).C.E.SvenssonandA.B.Garnsworthy,Hyp.Int.225,127(2014).
46,47K:Single-parPcleandpairstatesneardoubly-magic48Ca
CalibraPonsanddevelopmentwith
26Nabeams
GRIFFINisapowerfuldecayspectrometerfornuclearstructure,astrophysicsand
fundamentalinteracPonstudies.CommissionedFall2014.
2014
2014
2014
26 Jan 2018 30
The GRIFFIN Spectrometer for precision decay studies at ISAC
31,32Na,33,34,35Mg:Islandofinversion
115,115mAg:Equilibriumof115,115mCdduringthes-process
TechnicalandOverviewPublicaPonsA.B.Garnsworthyetal.,NIMA853,85(2017).U.Rizwanetal.,NIMA820,126(2016).A.B.Garnsworthy,ActaPhys.Pol.B,47,713(2016).C.E.SvenssonandA.B.Garnsworthy,Hyp.Int.225,127(2014).
46,47K:Single-parPcleandpairstatesneardoubly-magic48Ca
128,129,130,131,132Cd:Nuclearstructureandr-processnucleosynthesisattheN=82shellclosureR.Dunlopetal.,PRC93,062801(R)(2016).
CalibraPonsanddevelopmentwith
26Nabeams
GRIFFINisapowerfuldecayspectrometerfornuclearstructure,astrophysicsand
fundamentalinteracPonstudies.CommissionedFall2014.
2014
2014,2015
2014
2015
26 Jan 2018 31
The GRIFFIN Spectrometer for precision decay studies at ISAC
31,32Na,33,34,35Mg:Islandofinversion
115,115mAg:Equilibriumof115,115mCdduringthes-process
TechnicalandOverviewPublicaPonsA.B.Garnsworthyetal.,NIMA853,85(2017).U.Rizwanetal.,NIMA820,126(2016).A.B.Garnsworthy,ActaPhys.Pol.B,47,713(2016).C.E.SvenssonandA.B.Garnsworthy,Hyp.Int.225,127(2014).
46,47K,50Ca:Single-parPcleandpairstatesneardoubly-magic48CaA.B.Garnsworthyetal.,PRC96,044329(2017).
128,129,130,131,132Cd,129,130,131,132,133In:Nuclearstructureandr-processnucleosynthesisattheN=82shellclosureR.Dunlopetal.,PRC93,062801(R)(2016).
22Mg,62Ga:SuperallowedFermibetadecaysM.R.Dunlopetal.,PRC96,045502(2017).
145,146Cs:β-delayneutronmeasurementswithDESCANT,fast-PmingwithLaBr3
CalibraPonsanddevelopmentwith
9Li,26Na,66Gabeams
GRIFFINisapowerfuldecayspectrometerfornuclearstructure,astrophysicsand
fundamentalinteracPonstudies.CommissionedFall2014.
2016
2014,2016
2014,2015
20142016
2015,2016
26 Jan 2018 32
The GRIFFIN Spectrometer for precision decay studies at ISAC
31,32Na,33,34,35Mg:Islandofinversion
115,115mAg:Equilibriumof115,115mCdduringthes-process
TechnicalandOverviewPublicaPonsA.B.Garnsworthyetal.,NIMA853,85(2017).U.Rizwanetal.,NIMA820,126(2016).A.B.Garnsworthy,ActaPhys.Pol.B,47,713(2016).C.E.SvenssonandA.B.Garnsworthy,Hyp.Int.225,127(2014).
46,47K,50Ca:Single-parPcleandpairstatesneardoubly-magic48CaA.B.Garnsworthyetal.,PRC96,044329(2017).
128,129,130,131,132Cd,129,130,131,132,133In:Nuclearstructureandr-processnucleosynthesisattheN=82shellclosureR.Dunlopetal.,PRC93,062801(R)(2016).
22Mg,62Ga:SuperallowedFermibetadecaysM.R.Dunlopetal.,PRC96,045502(2017).
145,146Cs:β-delayneutronmeasurementswithDESCANT,fast-PmingwithLaBr3
CalibraPonsanddevelopmentwith
9Li,26Na,66Gabeams
228,230Fr:ProbingOctupoledeformaPonandcollecPvityinRadiumisotopes.
72Ga:Triaxialityandshapecoexistence
188-200Tl:DevelopmentofcollecPvityinHgisotopes
GRIFFINisapowerfuldecayspectrometerfornuclearstructure,astrophysicsand
fundamentalinteracPonstudies.CommissionedFall2014.
20172017
2017
2016
2014,2016
2014,2015
20142016
2015,2016
26 Jan 2018 33
GRIFFIN studies around doubly-magic 48Ca
50Ca-50Sc,Nov2016,1x106pps,~2hrs“Spectroscopyof50ScandthefirstcalculaPonofB(M3)strengthsusingabini>omethods”,A.B.Garnsworthy,Phys.Rev.C96,044329(2017).
50Sc-50Ti,Nov2016,1x106pps,~5hrs“SearchforparPcle-holeexcitaPonsacrosstheN=28shellclosure”,C.Jones,Mastersthesis(Jan2018),inpreparaPonforPhys.Rev.C(2018).
46K–46Ca,Dec2014,4x105pps,~40hrs“Detailedspectroscopyof46Ca:TheinvesPgaPonoftheβdecayof46KwiththeGRIFFINγ-rayspectrometer”,J.L.Pore,PhDthesis(2017),inpreparaPonforPhys.Rev.C(2018).
47K–47Ca,Dec2014,1x105pps,~90hrs“Detaileddecayspectroscopyof47Ca”,J.K.Smith,inpreparaPonforPhys.Rev.C(2018).
TwobeamUmeperiodswithGRIFFIN~5.5days• 1publicaUon,3inpreparaUon• 1PhDthesis,1Mastersthesis
26 Jan 2018 FRIB decay station workshop 34
1345
1227511774646
1674 2262
2200000
1400000
600000
PreviouslyReportedLevelScheme~36hoursofbeamPmetakeninDec2014
JenniferPore,CorinaAndreoiu,SFU
46Kto46CaBeta-DecayG-GCoincidences
46K to 46Ca Beta-Decay 46Kbeamof4x105ppsfor~40hrs~200gamma-raytransiPonsnewlyplaced.14previouslyunobservedexcitedstates(45totalobserved).
• States observed to within 815keV of the 7.7MeV Q value. • Branching ratios observed down to 10-3. • Weakest γ-ray observed has intensity of 0.0015% that of the 21
+ to 01+ transition.
• Compton-Suppression shields would have allowed observation of even weaker transitions.
• PhD thesis of J. Pore, Simon Fraser University. • In preparation for PRC.
26 Jan 2018 FRIB decay station workshop 36
GRIFFIN Results: Spectroscopy of 50Sc and ab initio calculations of B(M3) strengths
FirstcalculaPonofB(M3)strengthsusingabini>oValence-SpaceIn-MediumSimilarityRenormalizaPonGroupmethodandeffecPveoperator.
Gamma-gammaangularcorrelaPonswithGRIFFINconfirmM3isomerin50Sc.
γγ(θ):1519-71keV(1+-3+-2+)
A.B.Garnsworthy,M.Bowry,B.Olaizola,J.D.Holt,S.R.Strobergetal.,PRC96,44329(2017).
M3
26 Jan 2018 FRIB decay station workshop 37
Ultra-high statistics beta-decay spectroscopy of 72Ga-72Ge
T1/2=14hours.Datacollectedfor~12halflives.ThetwoGRIFFINandPACESspectrabeloweachrepresent10GBoutofatotalof8,000GB=0.125%!
A.B.Garnsworthy,J.Henderson,J.Smallcombe,J.K.Smith,M.Bowry,etal.,BeamPmeOct2017
Si(Li)HPGe
HighRate,~3MBq,~84μCi,80MB/stotalDAQrate16kHzSi(Li),24kHzHPGeperchannel
Si(Li)HPGe
LowRate,~25kBq,~0.7μCi,~2MB/stotalDAQrate0.5kHzSi(Li),0.2kHzHPGeperchannel
26 Jan 2018 FRIB decay station workshop 38
Thank you to Collaborators
30 June 2016 NUSPIN 2016 39
FRIB decay station workshop 39 26 Jan 2018
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