Presentation is loading. Please wait.

Presentation is loading. Please wait.

An Array of Bolometers for Rare Event’s Search Peng Haiping,Xuzizong State Key Lab. of Particle Detection and Electronics(USTC) Collab. Innova. Center.

Similar presentations


Presentation on theme: "An Array of Bolometers for Rare Event’s Search Peng Haiping,Xuzizong State Key Lab. of Particle Detection and Electronics(USTC) Collab. Innova. Center."— Presentation transcript:

1 An Array of Bolometers for Rare Event’s Search Peng Haiping,Xuzizong State Key Lab. of Particle Detection and Electronics(USTC) Collab. Innova. Center for Particles and Interactions

2 1 Introduction 2 Bolometers for Rare Event Search 3 Outlooks

3 1. Introduction Interactions of Particles with Medium of Detector Heat(phonons) is really responding to energy deposit of particles in the detector Bolometer is most powerfull detectors with high energy resolution and low energy threshold in energy measurement 2D-output’s Bolometer of high capability to identify NR from ER events

4 Introduction1 §1.1 Interactions of Particles with Medium of Detector Elastic collisions : NR-Nuclear Recoils or ER- electron recoils Energy deposit in detector E R Mean phonon enengy: ɛ p =2.7k B T =0.23meVK -1 In the Debye approximation Inelastic collision : a small amount of deposit energy for ionization Ar:26eV/ion pair Semicon.Si: 3.6eV/e-h pair,30% Ed for e-h pair and 70% Ed for phonons Scinti.Crystal: a small amount of deposit energy Ed for fluor. Photons: 40000/MeVx3eV=0.12~12% for photons and 88% for phonons

5 Bolometer - the detectors are based on phonon or quasi-particle’s measurement Semiconductor -D - the detectors are based on eletcron–hole pair’s measurement Gas detetor - the detectors are based on electron - ion pair’s measurement Scintillaton-D - the detectors are based on fluoresence photon’s measurement Introduction2

6 For scintillation medium, Y even small of a few percentage. Introduction3 §1.2 Bolometer : realy responding to energy deposit Energies for Phonons =Recoil energy +additional N p eV

7 Introduction4 According to the statistics: The measurement statistics accuracy FWHM: F is Fano facctor of O (1), N is the numbers of statistics samples, w is the mean energy spent in e-h, e-ion pair and phonon production §1.3 Bolometer: High energy Resolution and Low enengy threshods w = 26eV forAr-gas D 3.6eV for Si-semi.D ~meV for phonon and Quasi particle-D Bolometer(Micro-calorimeter) has largest samples of phonons or quasi-particles for a given Ed.So It has the highest enengy resolution and lowest energy threshold over all other detectors

8 一个用蓝宝石( 32 克) 做吸收体,用 W-TES ( SPT )传感器的微量热器 (@12mK) 对 Al , Ti 等荧光的响应 (b) 和它们典型的脉冲波形 (a) 图 2.6 蓝宝石 +W-TES 微量热器的输出波形( a )上升,微妙,下降几毫秒(两种衰减成分) ; 以及对 Al , Ti 和 Mn 元素的特征 X- 射线的响应。对 0.5 keV 谱线可见 (b) Colling P, et al. Nucl. Instrum. Methods A354:408 (1995) Introduction5 Example1 High Resol. Low thresh.

9 Introduction6 §1.4 2D-readout Bolometer, High Capability to identify NR from ER events Most of dielectric crystals with a proper Debye temperture θ could be as the absorbers of Bolometer. There are three kinds of crystals could be chosen : 1. Semiconductor with diode junction : there are 2 signals produced in the absorber for one hit event: Heat signal proportional to E R and charge signal proportional to YE R.(Y~0.3). 2. Scintillation crystal: there are 2 signals produced in the absorber for one hit event : Heat signal proportional to E R and fluores.signal proportional to YE R.(Y~0.02). 3. Other without e-h pair and fluores.light produced Heat signal proportional to E R only (CUORE-TeO2)

10 Y 值和反冲的类型有明显的依赖性 一个用 Ge 半导体探测器和 NTD 温度传感器 @25mK 制作的双信号同时测量显示的 1334 个电子型反冲 ( 60Co 伽玛)事件 ( 黑 X) 和 616 中子引起和反冲型 事件 ( 灰点 ) 在相对电离能损 (Y) 和反冲动能的两维 散点图 [1] [1] D. Abrams, et al. Phys. Rev. D66, 122003 (2002) A bolometer with heat and charge signal readouts for one event Introduction7 ER-zone Phonon Charge

11 Introduction8 A bolometer with heat and fluorescensce photon signal’s readouts for one event ER-zone NR-zone G.Anglober et al.,Eur.Phys. J,C(2012) 72:1971 2D readouts is able to discriminate NR events from ER events

12 2. Bolometers for Rare Event Search A BGO bolometer Searching for Rare α-Decay A CaWO4-Bolometer for Dark Matter Search A TeO2-Bolometer Searching 0ν ββ Decay

13 §2.1 A BGO bolometer searching for rare α-decay 一直到 2003 年 Orsay Cedex 实验室采用 2D-BGO bolometer 确认 209 Bi 的 α 衰变之前,人们普遍认为 209 Bi 核素是稳定的最重的天然同位素。 他们在研发用于暗物质寻找的 2D 读出的 BGO-Bolometer 时, 在复杂的背景谱中,确认了一条 3.137MeV 的 α- 谱线是有 209 Bi 核素发射的。 Letter to Nature 2003

14 NTD-heat sensor NTD-fluo. sensor §2.1

15 a 2D (light S.~heat S.,E R ) display of background events 46g BGO-bolometer running 100hrs b Spectra of energy deposits ER of background From event scater plots a High fluo-quench NR evts are seperated fron ER-evts From Spectra b up-trace shows the mixed evts and down-trace shows evts with high fluo-quench( plot a evts under the dot-dash line 3Bq/kg 207 Bi ER-evts Trace α-isotopes NR-evts Neuton BK –low energy NR-evts 3.137MeV α-line from majourity target nuclides 209 Bi §2.1

16 According the number of target nuclides of 209 Bi containing in 46g-BGO bolometer and running time,courting the numbers of α-evts collected.The half life time of 209 Bi T1/2=(1.9+-0.2)x10 19 years

17 23 51keV ER- 60 CO NR-neutron EC-evts of 207 Bi 15,88keV 1. LAS 60m altitude 2. A seperation NR-evts from ER evts is guaranteed down to 23keV(CL >90%) up to 51keV(CL.>99.99%) Potential for D.M Search §2.1

18 §2.2 A CaWO4-Bolometer for Dark Matter Search E0E0 ERER E 0 -E R E R (θ=0)=0 ; E R (θ=180)= (1-α)E 0 带电 +Z 的反冲核获得动能 E(R) 从 0 一直到 E RMAX 连续分布。而且是低反冲 动能的事件占优势

19 Spectra of N-Recoiller (Evt’s rate via E R ) is Mχ -and M T ’-s dependent Evt’s rates are very low: cournts /10kg year!!! Energy thresholds have to be in range of { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/12/3369602/slides/slide_19.jpg", "name": "Spectra of N-Recoiller (Evt’s rate via E R ) is Mχ -and M T ’-s dependent Evt’s rates are very low: cournts /10kg year!!.", "description": "Energy thresholds have to be in range of

20 §2.2 CRESS

21 §2.2 CRESS CA- A array of bolometers CR-Cryostat CF-A cold Finger link CR to bolometer CU-/PB-/PE:Copper/Lead/Polyethylene shield RB-Gas-tight box from Rn –gas MV-Scintillation counter Veto Cosmic rays CRESS setup

22 CRESS §2.2 Acc. Low high eγ-BG band Neutron from AmB One of a calbration 2D plot

23 eγ-BG band CRESS §2.2 6evts accepted Acc. 12.9 to40kev

24 §2.2 CRESS Acceptance: from E min to 40keV

25 §2.2 CRESS 2D-bolometer is an able to identify various Bk

26 §2.2 CRESS M1 Mχ=25.3GeV σ wN =1.6x10 -6 pb M2 Mχ=11.6GeV σ wN =3.7x10 -5 pb

27 The CUORICINO is a prototype of CUORE. The target nuclide: 130 Te §2.3 A TeO2 bolometer searching for 0ν ββ Decay

28 FWHM=7keV for crystals of 5x5x5 and 9keV for one of 3x3x6 cm at 2615 keV §2.3

29

30 For 0νββ search eγ BK Is not able to discrimated But trace α-BK could be Problem if 1D only Target Nuclide be selected Q>2615keV !! §2.3

31 60 Co(1170+1330) has to be avoided BG of the signals of 0νββ evts of 130 Te §2.3 63 Cu(n,α) 60 Co, 2 γ from 60 Co will contribute BK to the sgnals. Cu-shielder has to be store in proper place where is neutron free And make sure there is no trace of 60Co

32 3. Outlooks Prelimilary consideration about DBD-search 2D readout of an Array of bolometers R&D of key Techs -Scintill. and thermo- sensors

33 §3.1 Prelimilary consideration about DBD-search 2νββ-second order weak Interac. 0 νββ-1 lepton number-violation,2 Majorana /Dirac 2νββ 0νββ

34 §3.1 Basic Physics to be explored: 1 Determine the neutrino mass or set its up limit 2 Inform about the neutrino mass order 3 Information on Majorana CPV phase Normal Invert Mass order Theory expect Experiment determination of T 1/2

35 2νββ has been observed §3.1

36 0νββ-not observed.set the limits to T 0νββ and §3.1

37 其中 a 是同位素丰度, M[kg] 是 衰变物质质量, W[g/mol] 是同位素的摩尔质量, ΔE[keV] 是 附近的能窗宽度, B[keV kg y] -1 是本底计数率, t[y] 是测量的有效时间。 n σ 是实验的标准方差数, n σ =3 ,置信水平 99.73% 提高探测器在 Qββ 能窗区的能量分辨 (ΔE 小 ) ,压低该区的背景事例率( b ) 可以大大提高 T 0νββ 的測量限。 The limits far from the expected ones by theroy,10 26~28 years So the experiment search is still long way to go

38 §3.1 Lisa J. Kaufman arXiv:1305.3306v1

39 §3.2 2D- readout of an Array of bolometers BK problems for experiments of the target nuclide 76Ge Shielding lead isotopes(A=206,207 and 208) capture background neutrons become exicited isotopes 207Pb*,208Pb* and 209Pb* and contributes γ-BK between 2~3MeV. They and their escapped peaks will mimic the signals of E 2β =2039keV and 63 Cu(n,α) 60 Co, 2 γ from 60 Co will contribute BK to the sgnals. Q ββ =2039keV

40 For 0νββ search eγ BK Is not able to discrimated But trace α-BK could be Problem if 1D only Target Nuclide be selected Q>2615keV !! §3.2 BK problems for experiments of the target nuclide 130 Te Qββ=2615keV

41 60 Co(1170+1330) has to be avoided BG of the signals of 0νββ evts of 130 Te §3.2 63 Cu(n,α) 60 Co, 2 γ from 60 Co will contribute BK to the sgnals. Cu-shielder has to be store in proper place where is neutron free And make sure there is no trace of 60Co

42 CdWO4 90% CL §3.2 Energy Resol. Much worse than CUORE

43 FWHM ~80keV much worse than 7~9keV from the Bolometer of CUORE §3.2

44 FWHM=7keV for crystals of 5x5x5 and 9keV for one of 3x3x6 cm at 2615keV §3.2

45 1. Improvent the energy resollution by using the bolometer like CUORE 2. To suppress the Alpha radiactive trace isotops BK and neutron-BK NR events could be discriminated by quenched fluo-light signals 3. Find the proper target nuclides: Q ββ- keV ~3000keV Abun.% as high as possible Nuclide116-Cd82-Se100-Mo96-Zr150-Nd48-Ca130-Te Q ββ- keV2804.72995.43034.83350.03367.142722528.9 Abun.%7.69.29.62.85.6.18733.8 Task to be attacked

46 CdWO4 and §3.3 CdWO4 as a bolometer with 116 Cd- target nuclides to search the rare deday A Unit of CdWO4-bolometer

47 1. Search the neutrino-less double beta decay of Cd-nuclides(1.32x10 22 /cm 3 ) ∆ -88.715 -88.248 -91.521 MeV 116 Cd 116 In 116 Sn E 2ß = Q 2ß =2.806MeV 0+ 1+ the nature abundence of 116 Cd is 7.6% §3.2 Signals are larger than max BK 2.615MeV ER -BK free

48 114 Cd,A=28.8% 0+ 1+ ∆ -90.014 -88.584 -90.565 MeV 114 Cd 114 In 114 Sn E 2ß = Q 2ß =0.55MeV DB events are not easy to identify from gamma-electron BG events §3.3

49 2. Search for Alpha decay of W-nuclides(1.32x10 22 /cm 3 ) A% 0.13 26.3 28.6 30.7 14.3 According to Q,the life time were longer than 10 19 y and event rate were about 2~3/day. cc §3.3

50 § 3.3 Technical issues to be attacked 3. Cryogenic) system(Guo Guoping –Lab.of Quantum Communication USTC) 2. Thermometers 0f TES (Zhou Xingxiang) and NTD sensors Collab.with IMPL 1. Search for new radio-pure scintillation crystals with proper target nuclides (Qββ and Abundence)— Collab.with SIC and IOPA Nuclide116-Cd82-Se100-Mo96-Zr150-Nd48-Ca130-Te Q ββ- keV2804.72995.43034.83350.03367.142722528.9 Abun.%7.69.29.62.85.6.18733.8

51 §3.3

52 Triton Dilution Refrigerator 17th 核电子学和核探测技术学术年会, 兰州,许咨宗 §3.3

53 自然科学基金: 11275199 基于声子探测的低温粒子探测器

54 谢谢!

55 EXO200 §3.3

56

57 KamLAND-Zen §3.3

58

59 GERDA §3.3

60 CRESST@ GRAN SASSO/ Italy N.MIRABOLFATHI, arXiv1308.0044v1 31 Jul.2013 17th 核电子学和核探测技术学术年会, 兰州,许咨宗

61 N.MIRABOLFATHI, arXiv1308.0044v1 31 Jul.2013 17th 核电子学和核探测技术学术年会, 兰州,许咨宗

62 N.MIRABOLFATHI, arXiv1308.0044v1 31 Jul.2013 17th 核电子学和核探测技术学术年会, 兰州,许咨宗

63 Pictures I Photon

64

65


Download ppt "An Array of Bolometers for Rare Event’s Search Peng Haiping,Xuzizong State Key Lab. of Particle Detection and Electronics(USTC) Collab. Innova. Center."

Similar presentations


Ads by Google