Neutron complementary studies and neutral pion reconstruction. - PowerPoint PPT Presentation

Neutron complementary studies and neutral pion reconstruction. HPgTPC Meeting Eldwan Brianne DESY Hamburg, 14 th May 2019

Current status. Brief summary Software • Added few more options in the event display -> cluster display (with axis), tracks… • Track propagation calculation to ECAL Barrel and Endcap for track-cluster associations Proton • Tracking optimizations, bug corrections… Muon Other • Started an ECAL documentation (Note for DocDB) 𝛏 Pion � 2 Eldwan Brianne | HPgTPC meeting | 14/05/2019 Page

Neutron energy reconstruction. Reminder and setup Goals • Neutron energy reconstruction via TOF -> very critical • Improves neutrino energy reconstruction • Provides an handle to probe ν -Ar interactions • If demonstrated -> provides a direct constrain on ν µ -CC energy spectrum Setups • Looking at 3 setups • Di ff erent Sc thickness (5 and 10 mm) - keeping ECAL thickness the same (80 and 45 layers) • Enhance the neutron response with B 10 doping (5% in mass) for the 5 mm case • All have similar geometry -> HPgTPC + PV (0.5 X 0 ) + ECAL • Shooting neutrons at distance of 1 and 3 m from the ECAL - KE between 20 to 900 MeV • Looking at the first hit in time above 3 MeV � 3 Eldwan Brianne | HPgTPC meeting | 14/05/2019 Page

Neutron energy reconstruction. 1 Efficiency Reco level: At least one E > 3 MeV hit 0.9 First Setup All interactions First interactions Rescatters and others 0.8 First Setup 0.7 • 2 mm Cu + 5 mm Sc (80 layers) 0.6 • Overall e ffi ciency of above 50-60% 0.5 • Mostly dominated by rescatters 0.4 0.3 0.2 0.1 0 0 100 200 300 400 500 600 700 800 900 Neutron kinetic energy [MeV] � 4 Eldwan Brianne | HPgTPC meeting | 14/05/2019 Page

Nevts Neutron energy reconstruction. Reco level, KE = 50 MeV 3000 80 modules, 300 cm lever arm All interactions First Setup First interaction 2500 Rescatters and others First Setup 2000 • 2 mm Cu + 5 mm Sc (80 layers) 1500 • Overall e ffi ciency of above 50-60% 1000 • Mostly dominated by rescatters 500 • Energy reconstruction • 0 @ 50 MeV: large fraction at -1 (very delayed events due 1 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1 − − − − − to nucleus de-excitations) (Reco - True) / True KE • 2500 @ 400 MeV: Rescatter get more pronounced Nevts Reco level, KE = 400 MeV • Gets more and more pronounced at higher KE energies 80 modules, 300 cm lever arm All interactions 2000 • Systematic bias of the energy reconstruction to the left First interaction Rescatters and others 1500 1000 500 0 1 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1 − − − − − (Reco - True) / True KE � 5 Eldwan Brianne | HPgTPC meeting | 14/05/2019 Page

Neutron energy reconstruction. 0.6 First Setup Reco level: Bias and resolution All -bias 1st -bias scatter -bias 0.5 First Setup All resolution 1st resolution scatter resolution 0.4 • 2 mm Cu + 5 mm Sc (80 layers) • Overall e ffi ciency of above 50-60% 0.3 • Mostly dominated by rescatters 0.2 • Energy reconstruction • @ 50 MeV: large fraction at -1 (very delayed events due 0.1 to nucleus de-excitations) 0 • @ 400 MeV: Rescatter get more pronounced • Gets more and more pronounced at higher KE energies 0.1 − 0 100 200 300 400 500 600 700 800 900 • Systematic bias of the energy reconstruction to the left Neutron kinetic energy [MeV] • Overall picture • Bias increases with KE - RMS slightly increases • Adding rescatters worsen the bias and resolution � 6 Eldwan Brianne | HPgTPC meeting | 14/05/2019 Page

Neutron energy reconstruction. 1 Efficiency Second Setup Reco level: At least one E > 3 MeV hit 0.9 All interactions First interactions Rescatters and others 0.8 Second Setup 0.7 • 2 mm Cu + 5 mm Sc with 5% B 10 in weight (80 layers) 0.6 • Overall e ffi ciency of above 50-60% 0.5 • Mostly dominated by rescatters 0.4 • Slight improvement below 200 MeV -> mostly due to 0.3 gamma from neutron capture with the B 10 0.2 0.1 0 0 100 200 300 400 500 600 700 800 900 Neutron kinetic energy [MeV] � 7 Eldwan Brianne | HPgTPC meeting | 14/05/2019 Page

Neutron energy reconstruction. Nevts Reco level, KE = 50 MeV 3000 10 80 modules, 5% B , 300 cm lever arm Second Setup All interactions 2500 First interaction Rescatters and others Second Setup 2000 • 2 mm Cu + 5 mm Sc with 5% B 10 in weight (80 layers) 1500 • Overall e ffi ciency of above 50-60% 1000 • Mostly dominated by rescatters 500 • Slight improvement below 200 MeV -> mostly due to gamma from neutron capture with the B 10 0 1 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1 − − − − − • Energy reconstruction (Reco - True) / True KE • @ 50 MeV: smaller fraction at -1 Nevts 1800 Reco level, KE = 400 MeV • 10 @ 400 MeV: Rescatter get more pronounced 80 modules, 5% B , 300 cm lever arm 1600 All interactions • Rescatters seem more prononced First interaction 1400 Rescatters and others • Visible peak around -0.5 -> may be due to delayed 1200 neutron capture in B 10 (need to check) 1000 800 600 400 200 0 1 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1 − − − − − (Reco - True) / True KE � 8 Eldwan Brianne | HPgTPC meeting | 14/05/2019 Page

Neutron energy reconstruction. 0.6 Reco level: Bias and resolution Second Setup All -bias 1st -bias scatter -bias 0.5 All resolution 1st resolution scatter resolution Second Setup 0.4 • 2 mm Cu + 5 mm Sc with 5% B 10 in weight (80 layers) 0.3 • Overall e ffi ciency of above 50-60% • Mostly dominated by rescatters 0.2 • Slight improvement below 200 MeV -> mostly due to 0.1 gamma from neutron capture with the B 10 • Energy reconstruction 0 • @ 50 MeV: smaller fraction at -1 0.1 − 0 100 200 300 400 500 600 700 800 900 • @ 400 MeV: Rescatter get more pronounced Neutron kinetic energy [MeV] • Rescatters seem more prononced • Visible peak around -0.5 -> may be due to delayed neutron capture in B 10 (need to check) • Overall picture • 1st interaction resolution more flat • Very similar to 5 mm Sc w/o B 10 � 9 Eldwan Brianne | HPgTPC meeting | 14/05/2019 Page

Neutron energy reconstruction. 1 Efficiency Third Setup Reco level: At least one E > 3 MeV hit 0.9 All interactions First interactions Rescatters and others 0.8 Third Setup 0.7 • 2 mm Cu + 10 mm Sc (45 layers) 0.6 • Overall e ffi ciency of above 50-60% 0.5 • Still dominated by rescatters but smaller contribution -> 0.4 mainly due to less layers • 0.3 Slight improvement at low KE for first interactions? 0.2 0.1 0 0 100 200 300 400 500 600 700 800 900 Neutron kinetic energy [MeV] � 10 Eldwan Brianne | HPgTPC meeting | 14/05/2019 Page

Neutron energy reconstruction. Nevts Reco level, KE = 50 MeV 1800 45 modules, 10 mm Sc, 300 cm lever arm All interactions Third Setup 1600 First interaction 1400 Rescatters and others Third Setup 1200 1000 • 2 mm Cu + 10 mm Sc (45 layers) 800 • Overall e ffi ciency of above 50-60% 600 • Still dominated by rescatters but smaller contribution -> 400 mainly due to less layers 200 • Slight improvement at low KE for first interactions? 0 1 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1 − − − − − • Energy reconstruction (Reco - True) / True KE • @ 50 MeV: smaller fraction at -1 - sharper peak Nevts 1600 Reco level, KE = 400 MeV • @ 400 MeV: Rescatter get more pronounced 45 modules, 10 mm Sc, 300 cm lever arm 1400 All interactions • Rescatters seem more prononced - double peak -> First interaction 1200 needs investigations Rescatters and others 1000 • First interaction peak more gaussian-like 800 600 400 200 0 1 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1 − − − − − (Reco - True) / True KE � 11 Eldwan Brianne | HPgTPC meeting | 14/05/2019 Page

Neutron energy reconstruction. 0.6 Reco level: Bias and resolution Third Setup All -bias 1st -bias scatter -bias 0.5 All resolution 1st resolution scatter resolution Third Setup 0.4 • 2 mm Cu + 10 mm Sc (45 layers) 0.3 • Overall e ffi ciency of above 50-60% • Still dominated by rescatters but smaller contribution -> 0.2 mainly due to less layers • 0.1 Slight improvement at low KE for first interactions? • Energy reconstruction 0 • @ 50 MeV: smaller fraction at -1 - sharper peak • 0.1 − @ 400 MeV: Rescatter get more pronounced 0 100 200 300 400 500 600 700 800 900 Neutron kinetic energy [MeV] • Rescatters seem more prononced - double peak -> needs investigations • First interaction peak more gaussian-like • Overall picture • Similar conclusions as 5 mm Sc • Bias and resolution slightly more flat � 12 Eldwan Brianne | HPgTPC meeting | 14/05/2019 Page