Coincidence measurements for Gerda Phase II
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1 Coincidence measurements for Gerda Phase II Katharina von Sturm Università degli Studi di Padova June 26, 2014 Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
2 Table of contents 1 The 0νββ decay 2 The Gerda experiment 3 Motivation 4 Setup at LNL 5 Simulations 6 Summary Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
3 The 0νββ decay Some open questions we try to shed light on What is the mass of the neutrinos? Normal or inverted neutrino mass hierarchy? Are neutrinos Majorana or Dirac particles? Which physics beyond the Standard Model? Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
4 The 0νββ decay Some open questions we try to shed light on What is the mass of the neutrinos? Normal or inverted neutrino mass hierarchy? Are neutrinos Majorana or Dirac particles? Which physics beyond the Standard Model? Search for the 0νββ decay N (A,Z) N (A,Z+2) + 2e (+/////// 2ν e ) Lepton number violating L = 2 Physics beyond the standard model Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
5 The Gerda experiment The Gerda experiment BEGe Phase I T 0νββ 1/2 > yr 90% C.L. (med. sens. T 0νββ 1/2 > yr) Phase II 30 new detectors + improve background rejection Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
6 Motivation Pulse shape analysis to reduce background SSE Charge Current MSE rge rent MSE + p n + GERDA n + GERDA background SSE Charge Current + p signal Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
7 Motivation Pulse shape analysis to reduce background SSE Charge Current MSE rge rent MSE + p n + GERDA n + GERDA background Recognize and reject background events We want to know how signal like events look like in the detector SSE + Charge Current p signal Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
8 Motivation Single compton events with coincidence measurements Energy compton scattered photon E ν = E ν (1 + Eν m ec 2 (1 cos Θ) Energy electron E e = E ν E ν 661 kev γs from a 137 Cs source Coincidence measurements ) 1 Depending on the observation angle cut on energy to select single compton events Parameters A/E, rise-time etc. Neural network, pulse shape library Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
9 Setup at LNL LEGO... LEgnaro Germanium Observatory Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
10 Setup at LNL Laboratori Nazionali di Legnaro MC geometry Automatic filling every 14 h Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
11 Remote control Setup at LNL Everything is remote controllable Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
12 Simulations Tuning the MC simulations cts/0.1kev Cs measurement sim wo Cu-Holder sim w Cu-Holder energy [kev] 137 Cs Spectrum Comparison of uncollimated measurement and simulation Adding copper holder improves accordance Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
13 Collimated simulation Simulations Coaxial detectors collimated to 1 mm (left) and 10 mm (right) Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
14 Simulations Confinement of the events Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
15 Simulations Signal and Background events compton scatterings event radius [cm] About 85% are single compton events Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
16 Simulations Rate... Events where are thou? Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
17 Simulations Rate... Events where are thou? Events right energy confined in roughly 3x3x3 mm region roughly 85% are single compton events Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
18 Simulations Rate... Events where are thou? Events right energy confined in roughly 3x3x3 mm region roughly 85% are single compton events Event rate is on the order of 1 MBq 1 d 1 Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
19 Simulations Rate... Events where are thou? Events right energy confined in roughly 3x3x3 mm region roughly 85% are single compton events Event rate is on the order of 1 MBq 1 d 1 We can use a 740 MBq 137 Cs source Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
20 Simulations Rate... Events where are thou? Events right energy confined in roughly 3x3x3 mm region roughly 85% are single compton events Event rate is on the order of 1 MBq 1 d 1 We can use a 740 MBq 137 Cs source! Careful! Single rate cannot be too high pile-up! We cannot handle the source ourselves and need additional shielding Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
![Simulations Pulse shape simulations using adl3 charge [au] current [au] 60 50 40 30 20 10 pulse_1000v pulse_1500v pulse_2000v](/docs-images/86/94451157/images/21-0.jpg "pulse_2500v pulse_3000v pulse_3500v 0 0 200 400 600 800 1000 time [ns] 0.7 0.5 0.3 0.")
![1 pulse_1000v pulse_1500v pulse_2000v pulse_2500v pulse_3000v pulse_3500v 0 200 400 600 800 1000 time [ns] height [mm] height](/docs-images/86/94451157/images/21-1.jpg "[mm] height [mm] 28.0 24.0 2 16.0 12.0 8.0 4.0 Potential and Charge Path 1 2 3 4 5 6 7 length [mm] 28.0 24.0 2 16.0 12.0 8.0 4.0 1 2 3 4 5 6 7 length [mm] 28.")
21 Simulations Pulse shape simulations using adl3 charge [au] current [au] pulse_1000v pulse_1500v pulse_2000v pulse_2500v pulse_3000v pulse_3500v time [ns] pulse_1000v pulse_1500v pulse_2000v pulse_2500v pulse_3000v pulse_3500v time [ns] height [mm] height [mm] height [mm] Potential and Charge Path length [mm] length [mm] Potential and Charge Path Potential and Charge Path length [mm] Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
22 Summary Summary Background suppression with PSA is essential for Gerda Phase II Coincidence measurements to learn how Single Site events look like LEGO has been set up and is ready to go Compare with PS simulations Build a new method to do PSA and cross check other methods Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
23 Summary Summary Background suppression with PSA is essential for Gerda Phase II Coincidence measurements to learn how Single Site events look like LEGO has been set up and is ready to go Compare with PS simulations Build a new method to do PSA and cross check other methods DeltaTrigger cts Trigger [µs] trigger of a 22 Na measurement Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
24 Summary Thanks for your attention! Katharina von Sturm (Uni Padova) Coincidence measurements June 26, / 17
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