We describe a novel ionization signal capture and waveform digitization scheme for kiloton-scale ... more We describe a novel ionization signal capture and waveform digitization scheme for kiloton-scale liquid argon Time Projection Chamber (TPC) detectors. The scheme is based on a pixel-scale self-triggering `charge integrate/reset' block, local clocks running at unconstrained frequencies and dynamically established data networks. The scheme facilitates detailed capture of waveforms of arbitrary complexity from a sequence of varying time intervals, each of which corresponds to a fixed charge integral. An absolute charge auto-calibration process based on intrinsic $^{39}$Ar decay current is a major benefit. A flat electronic architecture with self-guided network generation provides exceptionally high resilience against single-point failure. Integrated photon detection, although highly speculative, may also be possible. The goal is optimized discovery potential. Much might be at stake.
Single molecule fluorescence detection of barium is investigated for enhancing the sensitivity an... more Single molecule fluorescence detection of barium is investigated for enhancing the sensitivity and robustness of a neutrinoless double beta decay ($0\nu\beta\beta$) search in $^{136}$Xe, the discovery of which would alter our understanding of the nature of neutrinos and the early history of the Universe. A key developmental step is the synthesis of barium-selective chemosensors capable of incorporation into ongoing experiments in high-pressure $^{136}$Xe gas. Here we report turn-on fluorescent naphthalimide chemosensors containing monoaza- and diaza-crown ethers as agents for single Ba$^{2+}$ detection. Monoaza-18-crown-6 ether naphthalimide sensors showed sensitivity primarily to Ba$^{2+}$ and Hg$^{2+}$, whereas two diaza-18-crown-6 ether naphthalimides revealed a desirable selectivity toward Ba$^{2+}$. Solution-phase fluorescence and NMR experiments support a photoinduced electron transfer mechanism enabling turn-on fluorescence sensing in the presence of barium ions. Changes in i...
Ultraviolet (UV) photon detection is becoming increasingly important in the quest to understand t... more Ultraviolet (UV) photon detection is becoming increasingly important in the quest to understand the fundamental building blocks of our universe. Basic properties of neutrinos and Dark Matter are currently being explored through interactions with noble elements. In response to interactions with fundamental particles, these elements emit scintillation photons in the UV range. However, most available detectors have poor response in the UV so it is typically necessary to shift UV to a wavelength, matching the sensitivity of the viable detectors. We report on development of UV-enhanced photosensors using wavelength-shifting properties of nanoparticles. Several nanoparticle coatings were tested for absorption of UV light with subsequent emission in the visible wavelength for high energy particle detection. ZnS:Mn,Eu, ZnS:Mn, CuCy (Copper Cysteamine) and CdTe nanoparticles all exhibited enhanced detection for wavelengths in the range 200-320 nm in several different tests, while ZnS:Ag and ...
It is noted that the nonzero charge asymmetry in the (KL)e3 decay demonstrates the nonorthogonali... more It is noted that the nonzero charge asymmetry in the (KL)e3 decay demonstrates the nonorthogonality of the KL0 and KS0 states. The result of the foregoing Letter on the charge asymmetry, combined with other measurements relevant to CP nonconservation in K decay, are found to be consistent with a phenomenological analysis, which yields a pion-pion scattering phase shift consistent with
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009
... Because quenching is likely to be strong for any molecular additive, this paper focuses prima... more ... Because quenching is likely to be strong for any molecular additive, this paper focuses primarily on pure xenon. ... 3.5. Impact for WIMP search. ... large fluctuations for energetic electrons in LXe directly and irretrievably degrade the resolution in the S 2 /S 1 ionization/scintillation ratio ...
Energy resolution is determined by fluctuations in the transformation of deposited energy to ioni... more Energy resolution is determined by fluctuations in the transformation of deposited energy to ionization and excitation. For noble gases, adding a molecular impurity that introduces a strong Penning effect reduces the Fano factor, improving energy resolution. I show that in xenon, adding trimethylamine (TMA) may provide a strong Penning effect and also permit electroluminescence (EL) at wavelengths characteristic of TMA. This combination may permit a large TPC to be operated with better than "intrinsic" energy resolution in the search for neutrino-less double beta decay in 136Xe. This path is being explored within the context of the NEXT collaboration.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1999
The possibility of using drift times for electrons and holes in an edge-on double-sided silicon s... more The possibility of using drift times for electrons and holes in an edge-on double-sided silicon strip detector to achieve a high resolution X-ray image has been investigated with help of computer simulations. The detector is in a scanned slit X-ray imaging geometry and collects ...
We describe a novel ionization signal capture and waveform digitization scheme for kiloton-scale ... more We describe a novel ionization signal capture and waveform digitization scheme for kiloton-scale liquid argon Time Projection Chamber (TPC) detectors. The scheme is based on a pixel-scale self-triggering `charge integrate/reset' block, local clocks running at unconstrained frequencies and dynamically established data networks. The scheme facilitates detailed capture of waveforms of arbitrary complexity from a sequence of varying time intervals, each of which corresponds to a fixed charge integral. An absolute charge auto-calibration process based on intrinsic $^{39}$Ar decay current is a major benefit. A flat electronic architecture with self-guided network generation provides exceptionally high resilience against single-point failure. Integrated photon detection, although highly speculative, may also be possible. The goal is optimized discovery potential. Much might be at stake.
Single molecule fluorescence detection of barium is investigated for enhancing the sensitivity an... more Single molecule fluorescence detection of barium is investigated for enhancing the sensitivity and robustness of a neutrinoless double beta decay ($0\nu\beta\beta$) search in $^{136}$Xe, the discovery of which would alter our understanding of the nature of neutrinos and the early history of the Universe. A key developmental step is the synthesis of barium-selective chemosensors capable of incorporation into ongoing experiments in high-pressure $^{136}$Xe gas. Here we report turn-on fluorescent naphthalimide chemosensors containing monoaza- and diaza-crown ethers as agents for single Ba$^{2+}$ detection. Monoaza-18-crown-6 ether naphthalimide sensors showed sensitivity primarily to Ba$^{2+}$ and Hg$^{2+}$, whereas two diaza-18-crown-6 ether naphthalimides revealed a desirable selectivity toward Ba$^{2+}$. Solution-phase fluorescence and NMR experiments support a photoinduced electron transfer mechanism enabling turn-on fluorescence sensing in the presence of barium ions. Changes in i...
Ultraviolet (UV) photon detection is becoming increasingly important in the quest to understand t... more Ultraviolet (UV) photon detection is becoming increasingly important in the quest to understand the fundamental building blocks of our universe. Basic properties of neutrinos and Dark Matter are currently being explored through interactions with noble elements. In response to interactions with fundamental particles, these elements emit scintillation photons in the UV range. However, most available detectors have poor response in the UV so it is typically necessary to shift UV to a wavelength, matching the sensitivity of the viable detectors. We report on development of UV-enhanced photosensors using wavelength-shifting properties of nanoparticles. Several nanoparticle coatings were tested for absorption of UV light with subsequent emission in the visible wavelength for high energy particle detection. ZnS:Mn,Eu, ZnS:Mn, CuCy (Copper Cysteamine) and CdTe nanoparticles all exhibited enhanced detection for wavelengths in the range 200-320 nm in several different tests, while ZnS:Ag and ...
It is noted that the nonzero charge asymmetry in the (KL)e3 decay demonstrates the nonorthogonali... more It is noted that the nonzero charge asymmetry in the (KL)e3 decay demonstrates the nonorthogonality of the KL0 and KS0 states. The result of the foregoing Letter on the charge asymmetry, combined with other measurements relevant to CP nonconservation in K decay, are found to be consistent with a phenomenological analysis, which yields a pion-pion scattering phase shift consistent with
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009
... Because quenching is likely to be strong for any molecular additive, this paper focuses prima... more ... Because quenching is likely to be strong for any molecular additive, this paper focuses primarily on pure xenon. ... 3.5. Impact for WIMP search. ... large fluctuations for energetic electrons in LXe directly and irretrievably degrade the resolution in the S 2 /S 1 ionization/scintillation ratio ...
Energy resolution is determined by fluctuations in the transformation of deposited energy to ioni... more Energy resolution is determined by fluctuations in the transformation of deposited energy to ionization and excitation. For noble gases, adding a molecular impurity that introduces a strong Penning effect reduces the Fano factor, improving energy resolution. I show that in xenon, adding trimethylamine (TMA) may provide a strong Penning effect and also permit electroluminescence (EL) at wavelengths characteristic of TMA. This combination may permit a large TPC to be operated with better than "intrinsic" energy resolution in the search for neutrino-less double beta decay in 136Xe. This path is being explored within the context of the NEXT collaboration.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1999
The possibility of using drift times for electrons and holes in an edge-on double-sided silicon s... more The possibility of using drift times for electrons and holes in an edge-on double-sided silicon strip detector to achieve a high resolution X-ray image has been investigated with help of computer simulations. The detector is in a scanned slit X-ray imaging geometry and collects ...
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