Analysis tool of AMoRE Pilot - Agenda (Indico) · AMoRE-II - Total 200kg • We are continuing our...
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− − Analysis tool of AMoRE Pilot K. R. Woo 1,2 with AMoRE collaboration 1 ℎ, , 2 & ℎ, Low Temperature Detector 1. Metallic Magnetic Calorimeter(MMC) using paramagnetic materials(Au:Er). 2. When energy is released in the crystal, its temperature increases. 3. And it changes the MMC’s magnetization. 4. Induces current change in Superconducting Quantum Interference Device(SQUID) loops. Data processing 40 Ca 100 MoO 4 Event Phonon collector Photon collector MMC SQUID = − 0 = 40 Ca 100 MoO 4 crytals SB28 S35 SS68 SE01 SB29 SE02 50 mK plate 10 mK 50 K plate 3 K plate Template signal(left) obtained by averaging a set of particle signals selected in the time domain. Template signal and noise power spectrum in the frequency domain(Right). 2 = 1 1+ 2 = ∗ () − : The noise power spectrum ∗ ( ) : The DFT of template : The maximum index : Cutoff frequency : Order number Optimum filter Butterworth Bandpass filter Neutrinoless Double Beta-Decay(0 ) Discovery of neutrino oscillation - Neutrinos have non-zero mass - Show very small values of neutrino mass-squared differences - Does not determine the nature of neutrinos Dirac : Fermions are known to exist in two forms particle and antiparticle Majorana : Neutrinos may be an exception, particle and antiparticle being identical. The most sensitive approach 0 experiment − − ҧ = 0 2 42 100 Mo 44 100 Ru = 3.034 MeV 43 100 Tc Energy [keV] Source 75 Pb k 239 212 Pb (Thorium Series) 352 214 Pb (Uranium Series) 511 208 Tl (Thorium Series) 583 208 Tl (Thorium Series) 609 214 Bi (Thorium Series) 1173 60 Co 1332 60 Co 1461 40 K (EC) 2615 208 Tl (Thorium Series) Muon veto system tag Changes from Run 5 to Run 6 1. Stabilization heater 2. Pin connector 3. Stycast → Lead-tin solder 4. Stainless steel screw → Cu screw 1 2 4 1 Neutron Shielding - Boric acid H 3 BO 3 - Borated PE (Boron 28%) Detection sensitivity on the AMoRE Pilot – Run 5 The solid green line is the fitted response function describing the flat background and the excluded 0 peak corresponding to the 90% confidence level (C.L.) limit of 1/2 0 > 9.5 × 10 22 y. 1/2 0 = log2 ∙ ∙∙∙ det ∙ det ∙ ∙ ∆ : The abundance of the isotope of interest : The detector efficiency : The number of the nuclide of interest in one absorber molecule det : The total molar mass of the detector material det ∙ : Exposure : The level of background ∆ : The energy resolution Official . ∙ Additional . ∙ 1/2 0 > 1.1 × 10 23 y 1/2 0 > 1.2 × 10 23 y Background Level (ROI) /( ∙ ∙ ) Run5 Run6 Run6 with neutron shield SE01 1.5 ± 0.39 0.60 ± 0.25 0.61 ± 0.35 The neutron shield is more effective in a wide energy region. Summary & Future plans for the AMoRE AMoRE-I - 18 crystals - CMO, LMO - ~2.9 kg of 100 Mo AMoRE-II - Total 200 kg • We are continuing our MMC and light detector research to improve the resolution. • Improved low background by using low-radioactivity materials and shielding against external radioactivity. • The AMoRE-I, the next phase of the project, which has a larger mass of crystals, is being prepared. # 264 Background level Event-by-Event identification
Transcript of Analysis tool of AMoRE Pilot - Agenda (Indico) · AMoRE-II - Total 200kg • We are continuing our...
𝑝
𝑝
𝑛
𝑛
𝑒−
𝑒−
Analysis tool of AMoRE PilotK. R.Woo1,2 with AMoRE collaboration
1 𝐶𝑒𝑛𝑡𝑒𝑟 𝑓𝑜𝑟 𝑈𝑛𝑑𝑒𝑟𝑔𝑟𝑜𝑢𝑛𝑑 𝑃ℎ𝑦𝑠𝑖𝑐𝑠, 𝐼𝑛𝑠𝑡𝑖𝑡𝑢𝑡𝑒 𝑓𝑜𝑟 𝐵𝑎𝑠𝑖𝑐 𝑆𝑐𝑖𝑒𝑛𝑐𝑒, 𝐾𝑜𝑟𝑒𝑎2 𝑈𝑛𝑖𝑣𝑒𝑟𝑠𝑖𝑡𝑦 𝑜𝑓 𝑆𝑐𝑖𝑒𝑛𝑐𝑒 & 𝑇𝑒𝑐ℎ𝑛𝑜𝑙𝑜𝑔𝑦, 𝐾𝑜𝑟𝑒𝑎
Low Temperature Detector
1. Metallic Magnetic Calorimeter(MMC) using paramagnetic materials(Au:Er).2. When energy is released in the crystal, its temperature increases.3. And it changes the MMC’s magnetization.4. Induces current change in Superconducting Quantum Interference Device(SQUID) loops.
Data processing
40Ca100MoO4
Event
Phonon collector
Photon collector
MMC SQUID
𝑡
𝜏 =𝐶
𝐺𝑇 − 𝑇0 =
𝐸
𝐶
40Ca100MoO4 crytals
SB28
S35
SS68
SE01
SB29
SE02
50 mK plate
10 mK
50 K plate
3 K plate
Template signal(left) obtained by averaging a set of particle signals selected in the time domain. Template signal and noise power spectrum in the frequency domain(Right).
𝐻 𝜔 2 =1
1 +𝜔𝜔𝑐
2𝑁
𝐻 𝜔 = 𝐴𝑠∗(𝜔)
𝑁 𝜔𝑒−𝑗𝜔𝑘𝑖𝑀
𝑁 𝜔 : The noise power spectrum𝑠∗(𝜔𝑘) : The DFT of template𝑖𝑀 : The maximum index
𝜔𝑐 : Cutoff frequency𝑁 : Order number
Optimum filter
Butterworth Bandpass filter
Neutrinoless Double Beta-Decay(0𝜈𝛽𝛽)
𝜈𝑒 𝜈𝜇
𝜈𝜏
Discovery of neutrino oscillation- Neutrinos have non-zero mass- Show very small values of neutrino mass-squared differences- Does not determine the nature of neutrinos
Dirac : Fermions are known to exist in two forms particle and antiparticleMajorana : Neutrinos may be an exception, particle and antiparticle being identical.
The most sensitive approach 0𝜈𝛽𝛽 experiment
𝑝
𝑝
𝑛
𝑛
𝑒−
𝑒−
ҧ𝜈𝑒 = 𝜈𝑒
0𝜈𝛽𝛽2𝜈𝛽𝛽
42100Mo
44100Ru
𝑄𝛽𝛽 = 3.034 MeV
𝑀
43100Tc
Energy [keV] Source
75 Pb k𝛼
239 212Pb (Thorium Series)
352 214Pb (Uranium Series)
511 208Tl (Thorium Series)
583 208Tl (Thorium Series)
609 214Bi (Thorium Series)
1173 60Co
1332 60Co
1461 40K (EC)
2615 208Tl (Thorium Series)
Muon veto system𝟐𝟏𝟐𝐁𝐢 tag
Changes from Run 5 to Run 6
1. Stabilization heater2. Pin connector3. Stycast → Lead-tin solder4. Stainless steel screw → Cu screw
1
2
4
1
Neutron Shielding- Boric acid H3BO3- Borated PE (Boron 28%)
Detection sensitivity on the AMoRE Pilot – Run 5
The solid green line is the fitted response function describing the flat background and the excluded
0𝜈𝛽𝛽 peak corresponding to the 90% confidence level (C.L.) limit of 𝑇1/20𝜈 > 9.5 × 1022 y.
𝑇1/20𝜈 = log2 ∙
𝑎 ∙ 𝜖 ∙ 𝜂 ∙ 𝑁𝐴𝐴det
∙𝑀det ∙ 𝑡
𝑏 ∙ ∆𝐸
𝑎 : The abundance of the isotope of interest𝜖 : The detector efficiency𝜂 : The number of the nuclide of interest in one absorber molecule𝐴det : The total molar mass of the detector material𝑀det ∙ 𝑡 : Exposure𝑏 : The level of background∆𝐸 : The energy resolution
Official 𝟓𝟐. 𝟏 𝐤𝐠 ∙ 𝐝 𝐨𝐟 𝟏𝟎𝟎𝐌𝐨 Additional 𝟔𝟕. 𝟏 𝐤𝐠 ∙ 𝐝 𝐨𝐟 𝟏𝟎𝟎𝐌𝐨
𝑇1/20𝜈 > 1.1 × 1023 y 𝑇1/2
0𝜈 > 1.2 × 1023 y
Background Level (ROI)𝐂𝐨𝐮𝐧𝐭𝐬/(𝐤𝐞𝐕 ∙ 𝐤𝐠 ∙ 𝐲)
Run5 Run6Run6
with neutron shield
SE01 1.5 ± 0.39 0.60 ± 0.25 0.61 ± 0.35
The neutron shield is more effective in a wide energy region.
Summary & Future plans for the AMoRE
AMoRE-I- 18 crystals- CMO, LMO- ~2.9 kg of 100Mo
AMoRE-II- Total 200 kg
• We are continuing our MMC and light detector research to improve the resolution. • Improved low background by using low-radioactivity materials and shielding against
external radioactivity.• The AMoRE-I, the next phase of the project, which has a larger mass of crystals, is being
prepared.
# 264
Background level
Event-by-Event identification
