Jason Surbrook UNC-CH TUNL-ORNL REU 2014

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Presentation transcript:

Jason Surbrook UNC-CH TUNL-ORNL REU 2014 Understanding neutron backgrounds at Oak Ridge National Laboratory's Spallation Neutron Source by assessing neutron activation in a p-type point-contact Germanium detector Jason Surbrook UNC-CH TUNL-ORNL REU 2014

Oak Ridge National Lab’s Spallation Neutron Source. What is the SNS Neutron production by Hg spallation Proton acceleration to 1 GeV, about 1.4 MWatts Each P “spalls” 20-30 N Oak Ridge National Lab’s Spallation Neutron Source. (courtesy of ORNL.gov) SNS is a source of intense PULSED neutrino flux!

Motivation COHERENT collaboration’s CEνNS [sĕns] Z0 COHERENT collaboration’s CEνNS [sĕns] Coherent Elastic Neutrino-Nucleus Scattering Assumed to be important in Supernovae Well calculable cross-section Strong test of the Standard Model Courtesy Wikimedia Commons

Coherent Elastic Neutrino Scattering Requires ν’s slower than 𝐸 ν =50MeV Faster, and it sees individual nucleons Deviations from cross section suggest at physics beyond SM SNS is a great location for neutrino research High intensity, pulsed neutrinos Free! Already being produced at SNS via pion decay SNS 𝐸 ν =30~50MeV; Ideal for scattering!!! M: Nuclear mass F: Form factor Qw: Weak charge E: n energy T: nuclear recoil energy GF: Fermi constant

Free Pulsed Neutrinos SNS beam operates at 60 Hz 2× 10 7 ν 𝑐 𝑚 2 𝑠 flux at 20 meters from target Pulsing allows for 2000x reduction of background

The Detector 0.825 kg High Purity Germanium (HPGe) Excellent energy resolution Established technology Needs to be LN cooled Has spent time unshielded in SNS target building Crystal Dislocations? Activation? Broad Energy Germanium (BEGe) detector cutaway from Canberra online catalogue

Detector Motivation HPGe and/or scintillators Is this particular detector viable? What exposure limits can we impose on HPGe? 2-Phase LXe CsI Crystal PPC HPGe Courtesy COHERENT collaboration

Crystal Damage Ge crystal dislocation due to fast neutrons Dislocation sites = charge traps Poor resolution Geometric irregularities Often skews observed energy peaks down

ν Measurement Noise Captured neutrons may cause detector radioactivity 68Ge e-captures to 68Ga, Ga emits x-ray at 10.4 keV Half Life is 271 days Coherent scattering is expected to be in the several keVee range Neutrons also impose prompt broad energy background Not measurable here, but requires attention!!

Good News, Everyone!

Looking more closely

Shielded Spectra

Shielded Spectra (<20 keV)

Well Defined Peak at 10.22 keV Cosmogenic Measured Counts per day 34.1±5.9 1547±78

Wrapping Up Results Detector energy resolution is adequate for CEνNS While at SNS, neutrons produced 5967±288 𝑎𝑡𝑜𝑚𝑠 𝑑𝑎𝑦 of 68Ge in this detector About 175x rate due to cosmic rays at sea-level Future Work Low energy calibration, to correct the 10.4 keV peak Explore T β-decay in low energy region of spectra Shielding effects on activation rates

Questions?