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AGATA Performance C ommissioning @ PRESPEC. AGATA Commissioning WG. Demonstrate the performance of AGATA in a RIB facility at relativistic beam energies .

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aim of the agata performance commissioning

Demonstratethe performance of AGATA in a RIB facility at relativisticbeamenergies.

Experimentally determine typicalbackgroundlevels, P/N-ratios and detectionsensitivityforCoulex and fragmentationexperiments.

Optimisebackgroundconditionsiffeasible.

Obtainfirst data-set fortheoptimisation of Pulse-ShapeAnalysis and Gamma-Ray Tracking algorithms(new conditions at the GSI environment).

Aim of the AGATA performance commissioning

two common techniques @ frs

RelativisticCoulomb Excitation

Au, Pb Target

250-500 mg/cm2

FRS: RIB

RIB: LYCCA

Twocommontechniques @ FRS

(Z,A)

(Z,A)

(Z,A)*

  • Secondaryfragmentationorparticleknockout

Be Target

250-500 mg/cm2

FRS: RIB

RIB: LYCCA

(Z,A)

(Z,A-2)

(Z,A-2)*

slide5

AGATA S2' @ GSI: efficiency vs. # triple (double) clusters

EFFICIENCY RESOLUTION

  • “Reference physics case”: Eg,o = 1 MeV, recoil nucleus at b = 0.43 (E = 100 MeV/u), Mg = 1

(GEANT4 AGATA code from NIMA 621 (2010) 331-343, E.Farnea et al.)

two common techniques @ frs1

RelativisticCoulomb Excitation

Au, Pb Target

250-500 mg/cm2

FRS: RIB

RIB: LYCCA

Twocommontechniques @ FRS

(Z,A)

(Z,A)

(Z,A)*

  • Secondaryfragmentationorparticleknockout

Be Target

250-500 mg/cm2

FRS: RIB

RIB: LYCCA

(Z,A)

(Z,A-2)

(Z,A-2)*

two common techniques @ frs2

Relativistic Coulomb Excitation

Au, Pb Target

250-500 mg/cm2

Energy

Degrader

FRS: RIB

RIB: LYCCA

Twocommontechniques @ FRS

(Z,A)

(Z,A)

(Z,A)*

300 MeV/u 100 MeV/u

  • Secondaryfragmentationorparticleknockout

Be Target

250-500 mg/cm2

Bremsstrahlungsbackground

FRS: RIB

RIB: LYCCA

(Z,A)

(Z,A-2)

(Z,A-2)*

two common techniques @ frs3

Relativistic Coulomb Excitation

Au, Pb Target

250-500 mg/cm2

Energy

Degrader

FRS: RIB

RIB: LYCCA

Twocommontechniques @ FRS

(Z,A)

(Z,A)

(Z,A)*

300 MeV/u 100 MeV/u

Counts

Smoothbackground

Eg

slide9

Effect of the lead absorber

No shielding

2mm Pb shielding

Really needed? how thick? Test it !

10+5

5+5

0+5

coulex benchmark case

Relativistic Coulomb Excitation (justanexample)

Energy

Degrader

Au Target

500 mg/cm2

FRS: RIB

RIB: LYCCA

Coulexbenchmark case

54Cr

54Cr

54Cr*

300 MeV/u 100 MeV/u

104particles/spill

pg-rate@AGATA = I54xNatxsCoulexxeg

2+

839.9 keV, 7.9 ps,

B(E2) = 14.6 W.u.

0+

54Cr

coulex benchmark case1

Relativistic Coulomb Excitation

Au Target

500 mg/cm2

Energy

Degrader

FRS: RIB

RIB: LYCCA

Coulexbenchmark case

54Cr

54Cr

54Cr*

300 MeV/u 100 MeV/u

104particles/spill

pg-rate@AGATA = I54xNatxsCoulexxeg

2+

839.9 keV, 7.9 ps,

B(E2) = 14.6 W.u.

0+

716 C/hour

54Cr

coulex benchmark case2

Relativistic Coulomb Excitation

Au Target

500 mg/cm2

Energy

Degrader

FRS: RIB

RIB: LYCCA

Coulexbenchmark case

54Cr

54Cr

54Cr*

300 MeV/u 100 MeV/u

104particles/spill

pg-rate@AGATA = I54xNatxsCoulexxeg

RAW

2+

839.9 keV, 7.9 ps,

B(E2) = 14.6 W.u.

0+

716 C/hour

54Cr

coulex benchmark case3

Relativistic Coulomb Excitation

Highefficiencyconfiguration

(d = 8.5 cm)

Au Target

500 mg/cm2

Energy

Degrader

FRS: RIB

RIB: LYCCA

Coulexbenchmark case

54Cr

54Cr

54Cr*

300 MeV/u 100 MeV/u

104particles/spill

pg-rate@AGATA = I54xNatxsCoulexxeg

RAW

2+

839.9 keV, 7.9 ps,

B(E2) = 14.6 W.u.

0+

716 C/hour

54Cr

coulex benchmark case4

Relativistic Coulomb Excitation

Highefficiencyconfiguration

(d = 8.5 cm)

Au Target

500 mg/cm2

Energy

Degrader

FRS: RIB

RIB: LYCCA

Coulexbenchmark case

54Cr

54Cr

54Cr*

300 MeV/u 130 MeV/u

104particles/s

pg-rate@AGATA = I54xNatxsCoulexxeg

AGATA Simulation

2+

RISING Exp.

839.9 keV, 7.9 ps,

B(E2) = 14.6 W.u.

0+

54Cr

PhD A. Buerger

beam candidates from nndc database

Up to A<90 (tokeepgood A resolution in LYCCA)

  • Eg in typicalCoulex/Fragmentationenergyrangei.e. 400keV-1.5 MeV
  • Large B(E2) in ordertooptimisebeam-time
  • Lifetime of thelevelabove 4 ps (todecayafterthe target)
  • Stablebeam (tofacilitate FRS start-up, etc)

Beamcandidates (fromnndcdatabase)

s ~ B(E2h)xZ2

concomitant aspects

Simultaneous Coulomb excitation of the Au-target atoms online inspection of the ARRAY performance (notDopplershifted).

Concomitantaspects

  • Ensure (online, butaftersomehoursduetothelowyield) thatparticle-gamma coincidences are workingproperly.
  • Allowsto determine Peak/Total-ratio and backgroundlevelforthe RAW spectrum, althoughtheseparameters are actuallyrelevant in theDopplerCorrectedspectrum.
concomitant aspects1

Simultaneous Coulomb excitation of the Au-target atoms online inspection of the ARRAY performance (notDopplershifted).

  • Secondaryfragmentationreactions in Au-target  same P/N-studyforfragmentationreactions, e.g.54Cr 50,52Cr, 50,52V, etc.

Concomitantaspects

  • Secondaryfragmentationorparticleknockout

Au Target

500 mg/cm2

FRS: RIB

RIB: LYCCA

(Z,A)

(Z,A-2)

(Z,A-2)*

counting rates summary example

Au Target

500 mg/cm2

Energy

Degrader

FRS: RIB

RIB: LYCCA

Countingratessummary (example)

54Cr

54Cr

54Cr*

300 MeV/u 100 MeV/u

104particles/spill

Beam time request: about 1 weektocollectenoughstatistics in everycrystal, and haveenough data to test PSA and tracking algorithms.

summary

The plan istoperforman “easy” Coulomb excitationexperiment in orderto determine experimentallythedetectionsensitivity of the AGATA arrayunder real experimental conditions at GSI, as well as Peak/Noise ratio in the gamma-rayenergyrangearound 1 MeV. Thestatistics/crystalshouldbelargeenoughtooptimise and tostudythe performance of PSA and Tracking algorithms.

  • Thisbenchmark-measurementwillbeperformed at thetwo “extreme” configurations of high-resolution (d=23.5cm) and high-efficiency (d=8.5cm). Twolongruns.
  • Simultaneouslyweshouldbeabletosee Coulomb excitationfromtheGold target (no Doppler-shift), whichallowsonetoconfirm online thatparticle-gamma correlationsare madeproperly.
  • At thesame time, selectingknockoutchannelsvia LYCCA we can studyalsotheseaspectsforsecondaryfragmentationexperiments.
  • Further ideas are welcome.

Summary

origin of the background radiation determined with hector

11000

7000

3000

1850

1950

2050

2150

2250

Disentanglement of thebackgroundcomponentsvia BaF2 HECTOR detectors (RISING)

Origin of the background radiation determined with HECTOR

Target area

Pb shield

BaF2 (HECTOR) projectile –gtime

10 ns

FRS area

T

  • downstream radiation
  • target radiation
  • neutrons
  • upstream-beam stopper radiation
slide21

11000

7000

3000

1850

1950

2050

2150

2250

Disentanglement of thebackgroundcomponentsvia BaF2 HECTOR detectors (PRESPEC)

HECTOR

  • Relativistic Coulomb Excitation

Energy

Degrader

Au Target

500 mg/cm2

FRS: RIB

RIB: LYCCA

54Cr

54Cr

54Cr*

300 MeV/u 130 MeV/u

104particles/s

BaF2 (HECTOR) projectile –gtime

?

  • downstream radiation
  • target radiation
  • neutrons
  • upstream-beam stopper radiation

10 ns

T

  • Proper time-gatefor gamma-rayspectrum in
  • AGATA (?)
lycca a and z id around 100 sn
LYCCA A and Z ID around100Sn

Slidefrom LYCCA Collaboration

slide25

AGATA S2' @ GSI: efficiency vs. # triple (double) clusters

  • “Reference physics case”: Eg,o = 1 MeV, recoil nucleus at b = 0.43 (E = 100 MeV/u), Mg = 1

(GEANT4 AGATA code from NIMA 621 (2010) 331-343, E.Farnea et al.)