Lineshape response of plastic scintillator to pair production of 4.44 MeV gamma's

Abstract

We measure the distribution of energy deposited in a 40x88 mm plastic scintillator by e+ e- pair production of 4.44 MeV gamma-rays. We observe the double-escape peak of 3.42 MeV from pair production by tagging 511 keV annihilation radiation in two high-Z scintillators. The source is a standard commercial neutron source using alpha-emitting 241Am encapsulated with 9Be, which has a reaction branch feeding the first Ipi=2+ state of 12C making the 4.44 MeV gamma-rays. We demonstrate the extraction of the double-escape peak from the large neutron-produced backgound, and explore some of the features and difficulties of this technique with our apparatus.

arXiv comment7 pages, 5 figures, published in NIM A

References in corpus (4)

• Precision measurement of the $\beta$-asymmetry in spin-polarized ${}^{37}\mathrm{K}$ decay
• A comparison of untagged gamma-ray and tagged-neutron yields from 241AmBe and 238PuBe sources
• Dependence of polytetrafluoroethylene reflectance on thickness at visible and ultraviolet wavelengths in air
• Reflectance dependence of polytetrafluoroethylene on thickness for xenon scintillation light

Cited by in corpus (2)

• Analog-antianalog isospin mixing in ${}^{47}$K ${\beta }^{-}$ decay
• $A_{\beta }[E_{\beta }]$ in ${}^{37}$K decay: new physics with opposite $\beta$ helicity