The Nikhef Dark Matter Group Patrick Decowski decowski@nikhef.nl - - PowerPoint PPT Presentation

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The Nikhef Dark Matter Group Patrick Decowski decowski@nikhef.nl - - PowerPoint PPT Presentation

Jul 22, 2023 519 likes •947 views

The Nikhef Dark Matter Group Patrick Decowski decowski@nikhef.nl Nikhef Jamboree 2015, Amsterdam Auke-Pieter Colijn Patrick Decowski Andrew Brown Jelle Aalbers Andrea Tiseni Daniela Erik Hogenbirk Remenska Dorine Schenk Frank Linde

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The Nikhef Dark Matter Group

Patrick Decowski

decowski@nikhef.nl

Nikhef Jamboree 2015, Amsterdam

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Sander Breur Jelle Aalbers Andrea Tiseni Chris Tunnell Erik Hogenbirk Andrew Brown Daniela Remenska

MSc student PhD candidate Postdoc Rest

Auke-Pieter Colijn Frank Linde Patrick Decowski

Dorine Schenk

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Sander Breur Jelle Aalbers Andrea Tiseni Chris Tunnell Erik Hogenbirk Andrew Brown Daniela Remenska

MSc student PhD candidate Postdoc Rest

Auke-Pieter Colijn Frank Linde Patrick Decowski

Dorine Schenk Bart Pelssers Maria Bader Left the group:

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Patrick Decowski - Nikhef/UvA

Our Activities

10cm 30cm 100cm XENON100 (160kg Xe): Analysis XENON1T (3500kg Xe), XENONnT (7000kg Xe) Cryostat & Support DAQ / Trigger Dataprocessor XAMS (0.5kg Xe): ALL

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Patrick Decowski - Nikhef/UvA

Use annual modulation: DM claim

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Patrick Decowski - Nikhef/UvA

Use annual modulation: DM claim

Aug 2013: 9.2σ significance of modulation signal Modulation present in 2-6 keV, absent above 6 keV

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Patrick Decowski - Nikhef/UvA

DM γ-source n-source

Nuclear Recoils

Identifying Electronic and Nuclear Recoils

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Patrick Decowski - Nikhef/UvA

DM DM γ-source n-source

Nuclear Recoils Electronic Recoils

Identifying Electronic and Nuclear Recoils

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Patrick Decowski - Nikhef/UvA

ER vs NR discr. Parameter

DM DM γ-source n-source

Nuclear Recoils Electronic Recoils

Identifying Electronic and Nuclear Recoils

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DM-electron scattering limits

XENON100 Coll, Science 2015 vol. 349 no. 6250, 851, arXiv:1507.07747

Mar May Jul Sep Nov Jan Mar 5 10 15 20 25 30 35 40 Rate (counts/(keV tonne day)) 995 1000 1005 1010 1015 1020 1025 1030

DAMA/LIBRA XENON100

  • Excl. @ 4.4σ

“DC Analysis”: Xe vs NaI

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DM-electron scattering limits

XENON100 Coll, Science 2015 vol. 349 no. 6250, 851, arXiv:1507.07747

Mar May Jul Sep Nov Jan Mar 5 10 15 20 25 30 35 40 Rate (counts/(keV tonne day)) 995 1000 1005 1010 1015 1020 1025 1030

DAMA/LIBRA XENON100

  • Excl. @ 4.4σ

“DC Analysis”: Xe vs NaI

Phase [Days]

20 40 60 80 100 120 140 160 180 200

Amplitude [events/(keV·tonne·day)]

2 4 6 8 10 12

Expected expected phase from DM halo

XENON100 95% C.L. 99.73% C.L. best fit

20 40 60 80 100 120 140 160 180 200

2 4 6 8 10 12

σ 1 σ 2 σ 3

2 4 6 81012

2 4 6 8 10 12

σ 1 σ 2 σ 3

  • 2log(L1/Lmax)
  • 2log(L1/Lmax)

DAMA/LIBRA XENON100 Coll, Phys. Rev. Lett. 115, 091302 (2015), arXiv:1507.07748

  • Excl. @ 4.8σ

“AC Analysis”

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Detailed Calibration program

88YBe (γ, n) source:

mono-energetic neutrons

5 10 15 20

Count/(0.25 keV)

1000 2000 3000 4000 5000

Data Tritium Beta Energy (keV)

  • J. Collar, arXiv: 1303.2686

LUX Coll, arXiv: 1512.03133

  • Use XENON100 to test many different calibrations and technologies
  • Neutron calibration through 88YBe - study low mass WIMPs
  • Electronic recoil calibration
  • 83mKr
  • Tritiated methane: CH3T
  • Radon spike tests to do cryogenic distillation of radon
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Ongoing Analyses

  • XENON100:
  • Low-mass WIMP analysis (Andrea, Chris)
  • Response to very low energy nuclear recoils (Andrew)
  • Update of “vanilla” WIMP analysis (Andrew)
  • XENON1T:
  • Data Acquisition System (Chris)
  • Data processing software (Chris, Jelle)
  • Event classification, statistics (Jelle)
  • Radon background analysis (Sander)
  • Gain Calibration (Erik)
  • Prototype Amplifier (Sander)
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Ongoing Analyses

  • XENON100:
  • Low-mass WIMP analysis (Andrea, Chris)
  • Response to very low energy nuclear recoils (Andrew)
  • Update of “vanilla” WIMP analysis (Andrew)
  • XENON1T:
  • Data Acquisition System (Chris)
  • Data processing software (Chris, Jelle)
  • Event classification, statistics (Jelle)
  • Radon background analysis (Sander)
  • Gain Calibration (Erik)
  • Prototype Amplifier (Sander)

Chris Tunnell became XENON1T analysis co-coordinator

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Patrick Decowski - Nikhef/UvA

XENON1T

Shown @ Jamboree’13

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Patrick Decowski - Nikhef/UvA

XENON1T

Shown @ Jamboree’13 Shown @ Jamboree’14

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Patrick Decowski - Nikhef/UvA

XENON1T

Shown @ Jamboree’13 Shown @ Jamboree’14 Inauguration on Nov 11, 2015

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Patrick Decowski - UvA/Nikhef

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Patrick Decowski - UvA/Nikhef

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Patrick Decowski - UvA/Nikhef

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Patrick Decowski - UvA/Nikhef

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Patrick Decowski - UvA/Nikhef

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Thank You’s to Technical Dept!

  • PDP / CT Group:
  • Under Ground → Above Ground network installation and optimization, Best LNGS

connectivity to any institute, DAQ hardware, general computing advice -

Tristan Suerink

  • GRID support, Tier-0 etc. - Jeff Templon, Jan-Just Keijser, David Groep
  • eScience:
  • (through PathFinder Grant) ROOT - Python integration - Daniela Remenska
  • ET Group:
  • Prototype XENON1(n)T amplifier - Guido Visser, Frans Schreuder
  • MT Group:
  • Design of XENON1T calibration system - Boudewijn vd Kroon, Rob Walet
  • Manufacture of many tiny TPC parts - Rob Leguijt, Rob Buis

And many more!

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XAMS: LXe R&D @ Nikhef

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XAMS TPC

Design by Rob Walet

Main improvement: tagged γ-source

22 10Na → 22 11Ne∗ + β+ + νe

Just received permit for an AmBe n-source

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Patrick Decowski - Nikhef/UvA

XAMS Data

17 22Na

Gas Liquid

S1 S2 E

e- e- e- Same dataprocessing SW as XENON1T

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Patrick Decowski - Nikhef/UvA

XAMS Data

17 22Na

Gas Liquid

S1 S2 E

e- e- e- Same dataprocessing SW as XENON1T

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Patrick Decowski - Nikhef/UvA

XAMS Data

17 22Na

Gas Liquid

S1 S2 E

e- e- e- Electron lifetime of 429 μs Same dataprocessing SW as XENON1T

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Patrick Decowski - Nikhef/UvA

Modulation Experiment

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Cobalt-60 Half life from experiment 5.11 ± 0.17 year Half life from literature 5.27 year 4 iden'cal experiments:

60Co

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Summary

  • Dark Matter Group entering interesting time
  • XENON100 is a useful test facility and still some analyses coming
  • ut
  • XENON1T entering commissioning phase
  • Preparations for XENONnT - 2019
  • XAMS facility a testbed for analyses and becoming R&D facility
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Summary

  • Dark Matter Group entering interesting time
  • XENON100 is a useful test facility and still some analyses coming
  • ut
  • XENON1T entering commissioning phase
  • Preparations for XENONnT - 2019
  • XAMS facility a testbed for analyses and becoming R&D facility
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Patrick Decowski - Nikhef/UvA

XENON100 Eletro-phillic DM

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S1 (PE) 5 10 15 20 25 30 Rate (counts/PE/tonne/day) 2 4 6 8 10 12 Mean electronic recoil energy (keV) 1 2 3 4 5 6 7 8 9 10 DAMA/LIBRA annually modulated spectrum (2-6)keV interpreted as leptophilic DM, axial-vector coupling mirror DM XENON100 70 summer live days

XENON100 Coll, Science 2015 vol. 349 no. 6250, 851, arXiv:1507.07747

)

2

(GeV/c

χ

WIMP Mass m 0.6 1 2 3 4 5 6 7 10 20 30 100 200 1000 )

2

(cm

e χ

σ Axial-Vector cross-section

  • 39

10

  • 38

10

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10

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10

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10

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10

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10

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10

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10

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10 ) σ DAMA/LIBRA (3 XENON100 (90% C.L.) (90% C.L.) τ τ → χ χ SK, (90% C.L.) ν ν → χ χ SK,

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Patrick Decowski - Nikhef/UvA

Yesterday’s New LUX results

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3 5 10 Qy (e / keV) 3 5 10 Ly (ph / keV) 1 10 100 0.001 0.01 0.1 1 Nuclear recoil energy (keV) Efficiency

10

1

10

2

10

3

10

−1

10 10

1

10

2

10

3

10

4

10

5

8B

SuperCDMS 2014 CDMSlite 2015 PandaX 2015 DarkSide−50 2015 XENON100 2012 LUX 2014 This Result

mWIMP ( GeV/c2 ) WIMP−nucleon cross section ( zb ) 10

−45

10

−44

10

−43

10

−42

10

−41

10

−40

WIMP−nucleon cross section ( cm 2 )

LUX Coll, arXiv:1512.03506

New low E data