texas a&m university is involved in two of the three dark matter experiments including both of the ones searching for weakly interacting dark matter particles selected for future funding by the us department of energy and the national science foundation on friday (july 11) the does office of science and nsfs physics division jointly announced they will back the super cryogenic dark matter search or supercdms-snolab experiment; the lux-zeplin experiment or lz; and the next iteration of the axion dark matter experiment admx-gen2 all three are classified as second-generation dark matter experiments because each will be at least 10 times as sensitive as the current standard in dark matter detection texas a&m scientists are longtime collaborators in the lz and supercdms experiments both of which are located underground and searching for wimps or weakly interacting massive particles admx-gen2 will search for a different kind of dark matter particles called axions two of the three dark matter experiments earmarked for funding support last week by the us department of energy and the national science foundation (including both of the ones searching for weakly interacting dark matter particles) are represented at texas a&m university (credit: nasa) closeup of a next-generation 4-inch detector in its mount fabricated at texas a&m university by high-energy physicist rupak mahapatra and his team for use in the generation 2 (g2) experiment at snolab texas a&ms robert c webb holder of the ed rachal chair in high-energy physics is a principal investigator in lz which is based in south dakota and managed by does lawrence berkeley national laboratory in addition texas a&m high-energy physicists rupak mahapatra and david toback and condensed matter physicist h rusty harris are principal investigators in supercdms now situated in ontario canada and managed by another doe power player fermi national accelerator laboratory the doe and nsf have selected the programs best suited to take the hunt for these elusive particles to the next level of sensitivity and texas a&m is involved with two of them webb said this is a very exciting time for dark matter research and both teams are hopeful that going to this next level of sensitivity will enhance our chances of discovering these objects webb and the late texas a&m physicist james white were two of the founding members of the large underground xenon (lux) experiment which joined forces with the united kingdom-based zeplin (zoned proportional scintillation in liquid noble gases) project shortly after revealing luxs first results in october 2013 that established it as the most sensitive dark matter detector in the world selection excitement notwithstanding the synergistic multidisciplinary research of two texas a&m departments physics and astronomy and electrical & computer engineering is underscored by the collaboration between mahapatra and harris (who holds joint appointments in both departments) that is helping to establish texas a&m and its george p and cynthia woods mitchell institute for fundamental physics and astronomy as a driving force as the hunt for dark matter intensifies dark matter if discovered could be the lynchpin between particle physics astronomy and cosmology and thus is at the very center of mitchell institute activities noted toback who joined mahapatra and harris as a pi in the experiment last year and brings decades of collider-based research experience at the fermilab tevatron indeed without the institutes crucial support the proposals would not been nearly as strong which is vital in competition not every dark matter experiment was selected to move forward but all the ones in the mitchell institute were program directors from the two federal funding agencies decided which experiments to pursue based on the advice of a panel of outside experts both agencies have committed to working to develop the new projects as expeditiously as possible according to jim whitmore program director for particle astrophysics in the division of physics at nsf the funding agencies opted for a varied particle-hunting approach because although physicists have seen plenty of evidence of the existence of dark matter through its strong gravitational influence they do not yet know what it looks like as individual particles we wanted to pool limited resources to put together the most optimal unified national dark matter program we could create said michael salamon who manages does dark matter program lz is capable of identifying wimps with a wide range of masses including those much heavier than any particle the large hadron collider at cern could produce supercdms which reported observation of the first concrete hint of wimps in 2013 will specialize in looking for light wimps with masses lower than 10 gev [gigaelectronvolts] (and of course both lz and supercdms are willing to stretch their boundaries a bit if called upon to double-check one anothers results) if a wimp hits the lz detector a high-tech barrel of liquid xenon it will produce quanta of light called photons if a wimp hits the supercdms detector a collection of hockey-puck-sized integrated circuits made with silicon or germanium and currently being fabricated at texas a&m it will produce quanta of sound called phonons texas a&ms supercdms group which currently features three pis and is set to add a fourth this fall is the largest among all collaboration members their activities in the experiment span a wide range of technical and scientific aspects from detector fabrication to cryogenic detector testing electronics data acquisition and data analysis we are very excited about the detector technology we are developing and how crucial it is to the success of the low-threshold detectors ideally suited for the low-mass wimp search mahapatra said the large investments from doe nsf and the texas a&m college of science in our group are finally leading us to play a major role in this world-leading dark matter search experiment despite the fact that both supercdms and lz will be located underground insuring that their detectors will be shielded from cosmic rays and the resulting potential of false positives they will still need to deal with natural radiation from the decay of uranium and thorium in the rock around them to combat this both experiments collect a second signal in addition to light or sound charge the ratio of the two signals lets them know whether the light or sound came from a dark matter particle or something else supercdms will be especially skilled at this kind of differentiation which is why the experiment should excel at searching for hard-to-hear low-mass particles we have been able to apply techniques used in the chip technology sector to vastly improve the quality cost and throughput of detectors for the cdms collaboration said harris who has extensive experience in the semiconductor industry in addition the creative interplay of high-energy particle physics and condensed matter physics has resulted in new innovative ideas to make detectors that can potentially detect dark matter particles lzs strength on the other hand stems from its size dark matter particles are constantly flowing through the earth so their interaction points in a dark matter detector should be distributed evenly throughout quanta of radiation however can be stopped by much less significant barriers alpha particles by a piece of paper beta particles by a sandwich even gamma ray particles which are harder to stop cannot reach the center of lzs 7-ton detector when a particle with the right characteristics interacts in the center of lz scientists will know to get excited for more information on the lux-zeplin experiment and webbs related research visit dr robert webb to learn more about the supercdms experiment and texas a&ms involvement go to https://physicstamuedu/research/high-energy-physics/ # # # # # # # # # # about research at texas a&m university: as one of the worlds leading research institutions texas a&m is in the vanguard in making significant contributions to the storehouse of knowledge including that of science and technology research conducted at texas a&m represents annual expenditures of more than $820 million that research creates new knowledge that provides basic fundamental and applied contributions resulting in many cases in economic benefits to the state nation and world to learn more visit http://researchtamuedu -atm- (story contains excerpts from original that appears in symmetry magazine) contact: shana k hutchins (979) 862-1237 or shutchins@sciencetamuedu; dr robert c webb (979) 845-4012 or webb@physicstamuedu; or dr rupak mahapatra (979) 229-4196 or mahapatra@physicstamuedu