Invent the LENS: Science Scope and Future Development Stages LENS Collaboration Collaboration VT - R. Bruce Vogelaar, Mark Pitt, Camillo Mariani, S. Derek Rountree, Laszlo Papp, Zachary Yokley, Tristan Wright, Joey Heimburger, Lillie Robinson LSU - Jeff Blackmon, Charles Rasco, Liudmyla Afanasieva, Kevin Macon, Matt Amrit BNL - Minfang Yeh, Lianming Hu NCCU - Diane Markoff, Israel Esan UNC - Art Champagne HBNI, India – Vivek Datar NSF supported R B Vogelaar Jun 9, 2014 1
Invent Why 115 In? the Future Advantages • Measures neutrino energy with low threshold • Taggable against internal & external backgrounds Solved (being demonstrated with mini-LENS) LENS Collaboration • Lattice construction • Scintillator Loading with In Remaining Challenges • Cross section uncertainty • Quenching effects • Size required for ‘precision’ • … never turn down more light … . 25 years ago, with current design, THIS would have been the experiment do to … 2
Invent the Future LENS Collaboration the 115 I charged current neutrino detector manifested in a “Scintillation Lattice” detector (Conceived by the late Raju Raghavan) 3
Invent the Future E e1 Δ t LENS Collaboration prompt trigger tag e 1 (neutrino event) Pulse vs Time correlated random single trigger tag In beta (false) 4
What makes a ‘trigger tag’? Invent the Future LENS Collaboration A1: 1 In beta (with Bremsstrehlung) A2: 1 In beta (to 497 plus gamma) B: 2 In betas (with Brem.) C: 3 In betas NOTE: all the ‘tag’ cells must fire within a 10 ns window ( Δ t w ) Internal ‘false tags’ due to In dominate 5 External ‘false tags’ eliminated by shielding
Invent the Future LENS Collaboration 6
Invent the Future LENS Collaboration YYY YYY YYY X X X X Y Z Z Z Y Y Y Z Configuration: C0 C1 C3 C5 # XP3330: 28 120 120 112 # 9821B: 0 6 78 150 Wall Index: 1.35 1.0/1.257 1.0/1.257 1.0/1.257 Scint: LAB 1% InLAB 1% InLAB 1%(10%) InLAB Figure 1 Staged configurations for micro-LENS (C0) and mini-LENS (C1,3,5 ). The yellow squares represent Photonis XP3330 tubes, which have poor timing characteristics. The blue squares represent 7 Electron Tubes 9821B PMTs. See supporting text for an explanation of this staged approach.
Invent Traditional 3% design: the Future • 5x5x5 m central detector • 10% by mass 115 In • 5 years of data LENS Collaboration Can 115 In be used to measure the “complete” solar neutrino spectrum to “1%”? 8
Invent quenching impact on pp ν the Future LENS Collaboration 9
Invent quenching impact on pp ν the Future LENS Collaboration Peak A: Single Photo-Electric interaction (about 1% of the time), slightly quenched ¡ Peak B: Compton, followed by Photo-Electric ¡ Peak C: two Comptons, followed by Photo-Electric ¡ Everything else: combination of Compton and Photo-Electric ¡ Notice how requiring 3 ‘hits’ removes Peaks A & B ¡ 10
Invent quenching impact on pp ν the Future LENS Collaboration 11
Invent the Future Calibration • Normalize to 7 Be results of Borexino • Neutrino source at detector LENS Collaboration • “LENS-Cal” per Raghavan • Mini-LENS next to reactor with short lived neutrino source ‘rabbit’ into core … • Serious challenge … 12
Invent the Future Other Scintillation Lattice LENS Collaboration applications … . 13
Invent the Future LENS Collaboration Figure 20: Expected signal in the SNO+ detector for enriched 150 Nd and a 150 meV Majorana mass.. Note (in addition to the 8 Be neutrino background) the broad peak caused by untagged internal 208 Tl decays which obscures the 0nu ββ peak. The modular design of the LENS detector affords a veto mechanism due to its ability to discriminate between cascade (beta + high e gamma) events such as the Tl background. (ZUB07) ¡ 14
Invent the Future LENS Collaboration 15
Invent the Future LENS Collaboration 16
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