ORCID Profile
0000-0002-4938-4266
Current Organisations
James Cook University
,
University of Queensland
,
Swinburne University of Technology
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Publisher: Springer Science and Business Media LLC
Date: 28-09-2023
Publisher: IOP Publishing
Date: 02-2023
DOI: 10.1088/1742-6596/2438/1/012061
Abstract: The Pyrate framework provides a dynamic, versatile, and memory-efficient approach to data format transformations, object reconstruction and data analysis in particle physics. The system is implemented with the Python programming language, allowing easy access to the scientific Python ecosystem and commodity big data technologies. Developed within the context of the SABRE South experiment for dark matter direct detection, Pyrate relies on a blackboard design pattern where algorithmic trees are dynamically generated throughout a run where root nodes are managed by a central control unit. The system guarantees an economical usage of memory allocated by algorithms where in idual algorithmic instances can be reused for multiple objects. The framework is intended to improve upon the user experience, portability and scalability of offline software systems currently available in the particle physics community with particular attention to medium to small-scale experiments.
Publisher: IOP Publishing
Date: 07-2021
DOI: 10.1088/1748-0221/16/07/P07034
Abstract: We have performed measurements of sodium nuclear recoils in NaI:Tl crystals, following scattering by neutrons produced in a 7 Li(p,n) 7 Be reaction. Understanding the light output from such recoils, which is reduced relative to electrons of equivalent energy by the quenching factor, is critical to interpret dark matter experiments that search for nuclear scattering interactions. We have developed a spectrum-fitting methodology to extract the quenching factor from our measurements, and report quenching factors for nuclear recoil energies between 36 and 401 keV. Our results agree with other recent quenching factor measurements that use quasi-monoenergetic neutron sources. The new method will be applied in the future to the NaI:Tl crystals used in the SABRE experiment.
Publisher: Elsevier BV
Date: 06-2021
Publisher: Elsevier BV
Date: 02-2021
Publisher: arXiv
Date: 2021
Publisher: arXiv
Date: 2022
Publisher: Springer Science and Business Media LLC
Date: 04-2021
DOI: 10.1140/EPJC/S10052-021-09098-5
Abstract: Ultra-pure NaI(Tl) crystals are the key element for a model-independent verification of the long standing DAMA result and a powerful means to search for the annual modulation signature of dark matter interactions. The SABRE collaboration has been developing cutting-edge techniques for the reduction of intrinsic backgrounds over several years. In this paper we report the first characterization of a 3.4 kg crystal, named NaI-33, performed in an underground passive shielding setup at LNGS. NaI-33 has a record low $$^{39}$$ 39 K contamination of 4.3 ± 0.2 ppb as determined by mass spectrometry. We measured a light yield of 11.1 ± 0.2 photoelectrons/keV and an energy resolution of 13.2% (FWHM/E) at 59.5 keV. We evaluated the activities of $$^{226}$$ 226 Ra and $$^{228}$$ 228 Th inside the crystal to be $$5.9\\pm 0.6~\\upmu $$ 5.9 ± 0.6 μ Bq/kg and $$1.6\\pm 0.3~\\upmu $$ 1.6 ± 0.3 μ Bq/kg, respectively, which would indicate a contamination from $$^{238}$$ 238 U and $$^{232}$$ 232 Th at part-per-trillion level. We measured an activity of 0.51 ± 0.02 mBq/kg due to $$^{210}$$ 210 Pb out of equilibrium and a $$\\alpha $$ α quenching factor of 0.63 ± 0.01 at 5304 keV. We illustrate the analyses techniques developed to reject electronic noise in the lower part of the energy spectrum. A cut-based strategy and a multivariate approach indicated a rate, attributed to the intrinsic radioactivity of the crystal, of $$\\sim $$ ∼ 1 count/day/kg/keV in the [5–20] keV region.
Publisher: IOP Publishing
Date: 02-03-2021
Publisher: Springer Science and Business Media LLC
Date: 03-2021
DOI: 10.1140/EPJC/S10052-021-08929-9
Abstract: A search for the pair production of heavy leptons as predicted by the type-III seesaw mechanism is presented. The search uses proton–proton collision data at a centre-of-mass energy of 13 TeV, corresponding to $$ 139\\,{\\text {fb}}^{-1} $$ 139 fb - 1 of integrated luminosity recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis focuses on the final state with two light leptons (electrons or muons) of different flavour and charge combinations, with at least two jets and large missing transverse momentum. No significant excess over the Standard Model expectation is observed. The results are translated into exclusion limits on heavy-lepton masses, and the observed lower limit on the mass of the type-III seesaw heavy leptons is 790 GeV at 95% confidence level.
Publisher: Sissa Medialab
Date: 22-02-2021
DOI: 10.22323/1.390.0279
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 06-2021
Publisher: Zenodo
Date: 2021
Publisher: Sissa Medialab
Date: 11-06-2020
DOI: 10.22323/1.369.0094
Publisher: Elsevier BV
Date: 04-2023
No related grants have been discovered for Louisa Handyside.