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LENS: m LENS Simulations, Analysis, and Results

LENS: m LENS Simulations, Analysis, and Results. B. Charles Rasco Louisiana State University on behalf of the LENS Collaboration. Why Low-Energy Neutrino Spectroscopy (LENS)?. To get n e energy information from the sun!.

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LENS: m LENS Simulations, Analysis, and Results

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  1. LENS: mLENS Simulations, Analysis, and Results B. Charles Rasco Louisiana State University on behalf of the LENS Collaboration

  2. Why Low-Energy Neutrino Spectroscopy (LENS)? To get ne energy information from the sun! Compare the photon luminosity of the sun to the luminosity of pp and CNO nenergy output from the sun. Measure the CNO n in order to get a direct measure of the metalicity of the sun.

  3. Why LENS? What signal are we looking for? Ee = En-Q En 497 keV 115 keV Phys. Rev. Lett. 37, 259 (1976). ne + 115In ® 115Sn* + b- Use 115In because reaction has a low Q value (~115 keV) In-loaded (~8% - 10 tons of Indium) liquid scintillator (LAB) In order to identify the electrons and gammas above background good position and time resolution are required. One way to accomplish position resolution is with a 3D segmented detector such as a scintillation lattice detector. LENS is a 60x60x60 scintillation lattice detector. (See R. Bruce Vogelaar’s Presentation J9-5)

  4. What is a Scintillation Lattice? Thin Container Filled with Liquid Scintillator Container Index of Refraction = n1 (Could be air) Liquid Scintillator Index of Refraction = n2 > n1

  5. What is a Scintillation Lattice? We call this a Scintillation Lattice (Though this animation just shows a Scintillation Plane)

  6. What Is LENS? (See Z. Yokley’s Presentation - J9-6)

  7. mLENS and miniLENS mLENS - 6x6x6 – 3” Cubes – Now miniLENS - 9x9x9 – 3” Cubes – Under Construction 4 m Water Tank LENS – mLENS and miniLENS will show the way... (See D. Rountree’s Presentation J9-7)

  8. Trigger PMT ~.5 mCi 137Cs Source Located Near Center Bottom of mLENS for ~ 1 hour What Was Measured? Background Run for ~ 1/2 hour Y=5 Plane Y=4 Plane Longer Background Run for ~ 1 week Y=3 Plane Y=2 Plane All Runs Triggered on Center Four Top PMT PMT All Approximately Normalized by Previous Measurements ~.5 mCi 137Cs Source

  9. Low E Bump Raw 137Cs Source (662 keV g) 137Cs (Compton Edge or Full E Deposit?) Background Subtracted 137Cs Source Background Subtracted 137Cs Data Background Normalized Over This Region 40K (1460 keV g) (Compton Edge or Full E Deposit?) Thorium (2.6 MeV g) (Compton Edge or Full E Deposit?)

  10. Simulation of 137Cs Source at Bottom of mLENS Low Trigger Threshold High Trigger Threshold Medium Trigger Threshold Relative height of low energy bump to high energy bump depends on the trigger level.

  11. Low Trigger Threshold Simulation of 137Cs Source at Bottom of mLENS Low Energy Peak is a Low Energy Deposit in the Plane. Most Likely Several Mostly Forward Compton Interactions (The Most Probable to Happen) in a Single Cell as the g Crosses the Plane. High Energy Peak is a Mixture of the Full Energy Deposit, Full Energy MinusLoss in the Outer Acrylic Shell, and the Compton Edge Deposit in the Plane.

  12. High Trigger Comparison of Simulation and First 137Cs Measurements Background Subtracted 137Cs Simulated 137Cs Simulated Number of PE / Proportionally Scaled Channel Number Measured data is proportionally normalized, not linearly normalized.

  13. The LENS Collaboration VT-- R. Bruce Vogelaar, Mark Pitt, Camillo Mariani, S. Derek Rountree, Laszlo Papp, Tristan Wright, Joey Heimburger, Lillie Robinson, Zach Yokley LSU -- Jeff Blackmon, B. Charles Rasco, Liudmyla Afanasieva, Kevin Macon, Matt Amrit BNL-- Minfang Yeh BNL NCCU--Diane Markoff UNC -- Art Champagne

  14. BACKUP SLIDES

  15. Sum Y=2+3+4 Planes Sum Y=2 Plane Sum Y=3 Plane Prediction for 3 Plane mLENS with Low Trigger Sum Y=4 Plane Measurement with Low Trigger Threshold And What it Translates to Measuring

  16. Sum Y=2+3+4 Planes Sum Y=2 Plane Sum Y=3 Plane Prediction for 3 Plane mLENS with High Trigger Sum Y=4 Plane Measurement with High Trigger Threshold And What it Translates to Measuring

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