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- W4221036267 abstract "Materials selection for rare event physics requires high performance detectors and customized analyses. In this context a novel $ensuremath{beta}text{ensuremath{-}}ensuremath{gamma}$ detection system, composed of a liquid scintillator in coincidence with a high-purity germanium (HPGe) detector, was developed with the main purpose of studying ultratrace contamination of uranium, thorium, and potassium in liquid samples. In the search for $^{238}mathrm{U}$ contaminations through neutron activation analysis, since the activation product $^{239}mathrm{Np}$ decays to a relatively long-lived isomeric state of $^{239}mathrm{Pu}$, it is possible to perform a time selection of these events, obtaining a strong background suppression. Investigating the time distribution of the coincidences between the ${ensuremath{beta}}^{ensuremath{-}}$ decay of $^{239}mathrm{Np}$ and the delayed events following the deexcitation of the $^{239}mathrm{Pu}$ isomeric level at 391.6 keV, a precision measurement of the half-life of this level was conducted. The resulting half-life of the 391.6 keV $^{239}mathrm{Pu}$ level is $190.2ifmmodepmelsetextpmfi{}0.2$ ns, thus increasing the precision by about a factor of 20 over previous measurements." @default.
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- W4221036267 date "2022-03-31" @default.
- W4221036267 modified "2023-09-28" @default.
- W4221036267 title "High precision measurement of the half-life of the 391.6 keV metastable level in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mmultiscripts><mml:mi>Pu</mml:mi><mml:mprescripts /><mml:none /><mml:mn>239</mml:mn></mml:mmultiscripts></mml:math>" @default.
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- W4221036267 doi "https://doi.org/10.1103/physrevc.105.034346" @default.
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