![]() ![]() Our expertise in xenon detector characterisation brings new analysis opportunities “from the ground up”. LZ represents a fantastic opportunity to observe new physics and our group is central to this effort. The group will be fully involved in the main dark matter searches, as well as in optimising and conducting a neutrinoless double beta decay search. We led several of the main physics analyses in ZEPLIN-III and in LUX, and have been contributing to preparing for data in LZ. Working with other UK colleagues, our GridPP computing team have been developing the LZ data infrastructure. We host the UK Data Centre that will store and process some 10 petabytes of LZ data and Monte Carlo simulations. We also contributed to the System Test platforms where key R&D was conducted prior to construction, focusing on the critical issue of spurious electron emission from electrodes operating in liquid xenon. The group delivered a fraction of the low-background photomultiplier tubes (PMTs) for the Xenon Detector and manufactured all the low-background voltage-divider PMT bases for the xenon space. He has also co-led the Xenon Detector work package in the international project, helping convene the large team that designed and built the main detector. Henrique Araújo led the R&D project (2012-2015) and then the construction project (2015-19) that delivered the various UK contributions to the experiment, and continues to represent the team as UK Spokesperson. Tim Sumner started discussions with the LUX collaboration leading to the formation of LZ in 2008. The Imperial group had a central role in the development of LZ. ![]() LZ Xenon Detector integrated at the Surface Assembly Lab at SURF, August 2019. We will be involved in several of the main physics analyses. The group was involved in the development of the Xenon Detector, and Imperial hosts one of the two data centres that will store, process and distribute data to the collaboration. Henrique Araújo leads LZUK, the team of nine UK institutes contributing to the experiment. In 2012 we joined LUX, which was about to operate at SURF – and LZ started to be planned at that time. ZEPLIN-III operated at the Boulby Mine (UK) around a decade ago the instrument was designed and built at Imperial. LZ was formed from the merger of the ZEPLIN-III and LUX collaborations. ![]() We have major expertise in this world-leading technology, and the group is centrally involved in all aspects of the experiment. We are also exploring the possibility of hosting such an experiment in the UK. This R&D effort takes place in our Liquid Xenon Laboratory at Imperial, working closely with our UK and international partners. Our Xenon Futures R&D project will be making important measurements and developing new technologies towards what could be the ‘ultimate’ experiment. The group is already looking forward to a next-generation experiment beyond LZ. LZ is sensitive to other rare physics processes, such as the neutrinoless double beta decay of Xe-136 – which would reveal, for example, that the neutrino is its own antiparticle – and to the interactions of astrophysical neutrinos via coherent elastic neutrino-nucleus scattering (CEvNS) – from solar neutrinos and, perhaps, from a nearby supernova! Together with the very low backgrounds achieved at the core of the detector, this allows LZ to achieve unrivalled sensitivity to WIMP interactions – giving us the best chance to detect our galactic dark matter. Schematic of the LZ experiment at SURF, showing the various detector components. This detector technology – partly pioneered by our group – provides high sensitivity to very faint collisions with the xenon atoms. Located under the Black Hills of South Dakota, nearly 1 mile underground, LZ operates in a very quiet environment, ideal for searching for rare interactions between dark matter particles and its large liquid xenon target.Īt the centre of LZ is a liquid xenon Time Projection Chamber (LXe-TPC) with 7 tonnes of active mass, surrounded by an Outer Detector ‘veto’ system. WIMPs would solve the dark matter puzzle in all its glory: explaining perfectly the diverse astrophysical evidence, fitting in seamlessly with the standard model of cosmology, and linking sensibly to the standard model of particle physics.Īfter several years of design and construction, the experiment has been taking data at the Sanford Underground Research Facility, USA. If the dark matter consists of Weakly Interacting Massive Particles (WIMPs), then LZ has a good chance of making a first detection in the coming years. LZ is a flagship experiment designed to hunt for the mysterious dark matter particles that we believe compose most of the matter in the universe. ![]()
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