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PSD Study of GSO

PSD Study of GSO. Sejong Univ. DaeSung Lim. Introduction. Test of GSO crystal for double β decay experiment α - γ separation is important for 0 ν double β decay experiment. Measurement. Used GSO(Gd 2 SiO 5 : Ce) crystal length : 3cm , diameter : 3cm Used 3inch RbCs PMT

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PSD Study of GSO

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  1. PSD Study of GSO Sejong Univ. DaeSung Lim

  2. Introduction • Test of GSO crystal for double β decay experiment • α-γ separation is important for 0ν double β decay experiment

  3. Measurement • Used GSO(Gd2SiO5 : Ce) crystal length : 3cm , diameter : 3cm • Used 3inch RbCs PMT • Measured α-events from 241Am source • Measured γ-events from 60Co source • Digital Oscilloscope (2µs,1GHz sampling) PMT GSO

  4. Sigma : 37.9 KeV Energy resolution : 5.7% Energy resolution : 137Cs # of event E(KeV)

  5. Alpha & Gamma data of GSO Accumulated spectra (1076KeV~1276KeV) Ref : M. Moszynski et al. Nucl. Instr. And Meth A 372 (1996) 51-58 Pulse height,A α(241Am source) τ1 = 42ns τ2 = 373ns time(µs) Pulse height,A γ(60Co source) τ1 = 38ns τ2 = 379ns time(µs)

  6. Reference Spectrum Ref : T. Fazzini et al. Nucl. Instr. And Meth A 410 (1998) 213-219 Pulse height,A Pulse height,A α γ time(ns) time(ns) Normalized Spectra Reference spectrum = Fα- Fγ Fα: function of α – pulse shape Fγ : function of γ– pulse shape

  7. PSD Result PSD parameter R α γ E(KeV) : pulse height in each time bin

  8. Comparison with Meantime PSD & Chisquare PSD # of event # of event α α γ γ meantime(µs) R # of event α γ chisquare

  9. Summary & Future • R-value PSD is similar to Meantime PSD. • PSD power is limited for GSO crystal. • Future Test of ZnSe(Te), ZrO2, PbMoO4 etc…

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