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38 results on '"Lorenzon, Wolfgang"'

1. DarkQuest: A dark sector upgrade to SpinQuest at the 120 GeV Fermilab Main Injector

Author

Apyan, Aram, Batell, Brian, Berlin, Asher, Blinov, Nikita, Chaharom, Caspian, Cuadra, Sergio, Demiragli, Zeynep, Duran, Adam, Feng, Yongbin, Fernando, I. P., Gori, Stefania, Harris, Philip, Hoang, Duc, Keller, Dustin, Kowalczyk, Elizabeth, Leys, Monica, Liu, Kun, Liu, Ming, Lorenzon, Wolfgang, Maksimovic, Petar, Suarez, Cristina Mantilla, Marukyan, Hrachya, Mitra, Amitav, Miyachi, Yoshiyuki, McCormack, Patrick, Moreno, Eric A., Morales, Yasser Corrales, Paladino, Noah, Rai, Mudit, Rotella, Sebastian, Saunders, Luke, Sawada, Shinaya, Smith, Carli, Sperka, David, Tesarek, Rick, Tran, Nhan, Tsai, Yu-Dai, Wan, Zijie, and Wynne, Margaret

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

Expanding the mass range and techniques by which we search for dark matter is an important part of the worldwide particle physics program. Accelerator-based searches for dark matter and dark sector particles are a uniquely compelling part of this program as a way to both create and detect dark matter in the laboratory and explore the dark sector by searching for mediators and excited dark matter particles. This paper focuses on developing the DarkQuest experimental concept and gives an outlook on related enhancements collectively referred to as LongQuest. DarkQuest is a proton fixed-target experiment with leading sensitivity to an array of visible dark sector signatures in the MeV-GeV mass range. Because it builds off of existing accelerator and detector infrastructure, it offers a powerful but modest-cost experimental initiative that can be realized on a short timescale., Comment: Contribution to Snowmass 2021; 37 pages, 35 figures, 2 tables

Published
2022

2. Timing Detectors with SiPM read-out for the MUSE Experiment at PSI

Author

Rostomyan, Tigran, Cline, Ethan, Lavrukhin, Ievgen, Atac, Hamza, Atencio, Ariella, Bernauer, Jan C., Briscoe, William J., Cohen, Dan, Cohen, Erez O., Collicott, Cristina, Deiters, Konrad, Dogra, Shraddha, Downie, Evangeline, Erni, Werner, Fernando, Ishara P., Flannery, Anne, Gautam, Thir, Ghosal, Debdeep, Gilman, Ronald, Golossanov, Alexander, Hirschman, Jack, Kim, Minjung, Kohl, Michael, Krusche, Bernd, Li, Lin, Lin, Win, Liyanage, Anusha, Lorenzon, Wolfgang, Mohanmurthy, Prajwal, Nazeer, Jesmin, Or, Paz, Patel, Tanvi, Piasetzky, Eli, Pilip, Nikolay, Reid, Haley, Reimer, Paul E., Ron, Guy, Rooney, Ethan, Shamai, Yair, Solazzo, Peter, Strauch, Steffen, Vidne, Dan, and Wuerfel, Noah

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The Muon Scattering Experiment at the Paul Scherrer Institut uses a mixed beam of electrons, muons, and pions, necessitating precise timing to identify the beam particles and reactions they cause. We describe the design and performance of three timing detectors using plastic scintillator read out with silicon photomultipliers that have been built for the experiment. The Beam Hodoscope, upstream of the scattering target, counts the beam flux and precisely times beam particles both to identify species and provide a starting time for time-of-flight measurements. The Beam Monitor, downstream of the scattering target, counts the unscattered beam flux, helps identify background in scattering events, and precisely times beam particles for time-of-flight measurements. The Beam Focus Monitor, mounted on the target ladder under the liquid hydrogen target inside the target vacuum chamber, is used in dedicated runs to sample the beam spot at three points near the target center, where the beam should be focused., Comment: Fixed typos, added references, and rephrased some sections to be clearer. Changed numbering of tables and figures in Appendix

Published
2020
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3. Reflectance dependence of polytetrafluoroethylene on thickness for xenon scintillation light

Author

Haefner, Jonathan, Neff, Alissa, Arthurs, Maris, Batista, Elizabeth, Morton, Daniel, Okunawo, Matt, Pushkin, Kirill, Sander, Aaron, Stephenson, Scott, Wang, Yuhan, and Lorenzon, Wolfgang

Subjects
Physics - Instrumentation and Detectors
Abstract

Many rare event searches including dark matter direct detection and neutrinoless double beta decay experiments take advantage of the high VUV reflective surfaces made from polytetrafluoroethylene (PTFE) reflector materials to achieve high light collection efficiency in their detectors. As the detectors have grown in size over the past decade, there has also been an increased need for ever thinner detector walls without significant loss in reflectance to reduce dead volumes around active noble liquids, outgassing, and potential backgrounds. We report on the experimental results to measure the dependence of the reflectance on thickness of two PTFE samples at wavelengths near 178 nm. No change in reflectance was observed as the thickness of a cylindrically shaped PTFE vessel immersed in liquid xenon was varied between 1 mm and 9.5 mm., Comment: 7 pages, 10 figures

Published
2016
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4. Dark Matter Results from First 98.7-day Data of PandaX-II Experiment

Author

Collaboration, PandaX-II, Tan, Andi, Xiao, Mengjiao, Cui, Xiangyi, Chen, Xun, Chen, Yunhua, Fang, Deqing, Fu, Changbo, Giboni, Karl, Giuliani, Franco, Gong, Haowei, Hu, Shouyang, Huang, Xingtao, Ji, Xiangdong, Ju, Yonglin, Lei, Siao, Li, Shaoli, Li, Xiaomei, Li, Xinglong, Liang, Hao, Lin, Qing, Liu, Huaxuan, Liu, Jianglai, Lorenzon, Wolfgang, Ma, Yugang, Mao, Yajun, Ni, Kaixuan, Ren, Xiangxiang, Schubnell, Michael, Shen, Manbin, Shi, Fang, Wang, Hongwei, Wang, Jiming, Wang, Meng, Wang, Qiuhong, Wang, Siguang, Wang, Xuming, Wang, Zhou, Wu, Shiyong, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yang, Yong, Yue, Jianfeng, Zeng, Xionghui, Zhang, Hongguang, Zhang, Hua, Zhang, Huanqiao, Zhang, Tao, Zhao, Li, Zhou, Jing, Zhou, Ning, and Zhou, Xiaopeng

Subjects
High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

We report the WIMP dark matter search results using the first physics-run data of the PandaX-II 500 kg liquid xenon dual-phase time-projection chamber, operating at the China JinPing Underground Laboratory. No dark matter candidate is identified above background. In combination with the data set during the commissioning run, with a total exposure of 3.3$\times10^4$ kg-day,the most stringent limit to the spin-independent interaction between the ordinary and WIMP dark matter is set for a range of dark matter mass between 3.5 and 1000 GeV/c$^2$. The best upper limit on the scattering cross section is found $2.5\times 10^{-46}$ cm$^2$ for the WIMP mass 40 GeV/c$^2$ at 90% confidence level., Comment: version accepted by PRL, 12 pages, 5+11 figures (including supplementary materials), 4 tables

Published
2016
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5. Dark Matter Search Results from the Commissioning Run of PandaX-II

Author

PandaX Collaboration, Tan, Andi, Xiao, Xiang, Cui, Xiangyi, Chen, Xun, Chen, Yunhua, Fang, Deqing, Fu, Changbo, Giboni, Karl, Giuliani, Franco, Gong, Haowei, Hu, Shouyang, Huang, Xingtao, Ji, Xiangdong, Ju, Yonglin, Lei, Siao, Li, Shaoli, Li, Xiaomei, Li, Xinglong, Liang, Hao, Lin, Qing, Liu, Huaxuan, Liu, Jianglai, Lorenzon, Wolfgang, Ma, Yugang, Mao, Yajun, Ni, Kaixuan, Pushkin, Kirill, Ren, Xiangxiang, Schubnell, Michael, Shen, Manbin, Shi, Fang, Stephenson, Scott, Wang, Hongwei, Wang, Jiming, Wang, Meng, Wang, Qiuhong, Wang, Siguang, Wang, Xuming, Wang, Zhou, Wu, Shiyong, Xiao, Mengjiao, Xie, Pengwei, Yan, Binbin, Yang, Yong, Yue, Jianfeng, Zeng, Xionghui, Zhang, Hongguang, Zhang, Hua, Zhang, Huanqiao, Zhang, Tao, Zhao, Li, Zhou, Jing, and Zhou, Xiaopeng

Subjects
High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

We present the results of a search for WIMPs from the commissioning run of the PandaX-II experiment located at the China Jinping underground Laboratory. A WIMP search data set with an exposure of 306$\times$19.1 kg-day was taken, while its dominant $^{85}$Kr background was used as the electron recoil calibration. No WIMP candidates are identified, and a 90\% upper limit is set on the spin-independent elastic WIMP-nucleon cross section with a lowest excluded cross section of 2.97$\times$10$^{-45}$~cm$^2$ at a WIMP mass of 44.7~GeV/c$^2$., Comment: 7 pages, 6 figures, v2 as accepted by PRD

Published
2016
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6. Low-mass dark matter search results from full exposure of PandaX-I experiment

Author

PandaX Collaboration, Xiao, Xiang, Chen, Xun, Tan, Andi, Chen, Yunhua, Cui, Xiangyi, Fang, Deqing, Fu, Changbo, Giboni, Karl L., Gong, Haowei, Guo, Guodong, He, Ming, Ji, Xiangdong, Ju, Yonglin, Lei, Siao, Li, Shaoli, Lin, Qing, Liu, Huaxuan, Liu, Jianglai, Liu, Xiang, Lorenzon, Wolfgang, Ma, Yugang, Mao, Yajun, Ni, Kaixuan, Pushkin, Kirill, Ren, Xiangxiang, Schubnell, Michael, Shen, Manbin, Shi, Yuji, Stephenson, Scott, Wang, Hongwei, Wang, Jiming, Wang, Meng, Wang, Siguang, Wang, Xuming, Wang, Zhou, Wu, Shiyong, Xiao, Mengjiao, Xie, Pengwei, Yan, Binbin, You, Yinghui, Zeng, Xionghui, Zhang, Tao, Zhao, Li, Zhou, Xiaopeng, and Zhu, Zhonghua

Subjects
High Energy Physics - Experiment, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

We report the results of a weakly-interacting massive particle (WIMP) dark matter search using the full 80.1\;live-day exposure of the first stage of the PandaX experiment (PandaX-I) located in the China Jin-Ping Underground Laboratory. The PandaX-I detector has been optimized for detecting low-mass WIMPs, achieving a photon detection efficiency of 9.6\%. With a fiducial liquid xenon target mass of 54.0\,kg, no significant excess event were found above the expected background. A profile likelihood analysis confirms our earlier finding that the PandaX-I data disfavor all positive low-mass WIMP signals reported in the literature under standard assumptions. A stringent bound on the low mass WIMP is set at WIMP mass below 10\,GeV/c$^2$, demonstrating that liquid xenon detectors can be competitive for low-mass WIMP searches., Comment: v3 as accepted by PRD. Minor update in the text in response to referee comments. Separating Fig. 11(a) and (b) into Fig. 11 and Fig. 12. Legend tweak in Fig. 9(b) and 9(c) as suggested by referee, as well as a missing legend for CRESST-II legend in Fig. 12 (now Fig. 13). Same version as submitted to PRD

Published
2015
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7. First dark matter search results from the PandaX-I experiment

Author

PandaX Collaboration, Xiao, Mengjiao, Xiao, Xiang, Zhao, Li, Cao, Xiguang, Chen, Xun, Chen, Yunhua, Cui, Xiangyi, Fang, Deqing, Fu, Changbo, Giboni, Karl L., Gong, Haowei, Guo, Guodong, Hu, Jie, Huang, Xingtao, Ji, Xiangdong, Ju, Yonglin, Lei, Siao, Li, Shaoli, Lin, Qing, Liu, Huaxuan, Liu, Jianglai, Liu, Xiang, Lorenzon, Wolfgang, Ma, Yugang, Mao, Yajun, Ni, Kaixuan, Pushkin, Kirill, Ren, Xiangxiang, Schubnell, Michael, Shen, Manbing, Stephenson, Scott, Tan, Andi, Tarle, Greg, Wang, Hongwei, Wang, Jimin, Wang, Meng, Wang, Xuming, Wang, Zhou, Wei, Yuehuan, Wu, Shiyong, Xie, Pengwei, You, Yinghui, Zeng, Xionghui, Zhang, Hua, Zhang, Tao, and Zhu, Zhonghua

Subjects
High Energy Physics - Experiment, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

We report on the first dark-matter (DM) search results from PandaX-I, a low threshold dual-phase xenon experiment operating at the China Jinping Underground Laboratory. In the 37-kg liquid xenon target with 17.4 live-days of exposure, no DM particle candidate event was found. This result sets a stringent limit for low-mass DM particles and disfavors the interpretation of previously-reported positive experimental results. The minimum upper limit, $3.7\times10^{-44}$\,cm$^2$, for the spin-independent isoscalar DM-particle-nucleon scattering cross section is obtained at a DM-particle mass of 49\,GeV/c$^2$ at 90\% confidence level., Comment: 7 pages, 6 figures, final version as appeared in the journal publication

Published
2014
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8. High Resolution Gamma Ray Detection in a Dual Phase Xenon Time Projection Chamber

Author

Lin, Qing, Wei, Yuehuan, Bao, Jie, Hu, Jie, Li, Xinran, Lorenzon, Wolfgang, Ni, Kaixuan, Schubnell, Michael, Xiao, Mengjiao, and Xiao, Xiang

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

Dual phase Xenon Time Projection Chambers (XeTPCs) are being used by several experiments as a promising technique for direct detection of dark matter. We report on the design and performance of a small 3-D sensitive dual phase XeTPC. The position resolution is 2 mm in the center of detector, limited by the hole size of the mesh at the proportional scintillation region. An energy resolution of 1.6%({\sigma} /E) for 662 keV gamma rays is achieved by combining the ionization and scintillation signals at a drift field of 0.5 kV/cm. This represents the best energy resolution achieved among liquid xenon detectors. The energy resolution is only slightly dependent on drift field. Better than 2% energy resolution ({\sigma} /E) for 662 keV gamma rays can be achieved for drift fields between 100 V/cm and 2 kV/cm. With high position and energy resolutions, a dual phase XeTPC has also potential applications in surveys for neutrinoless double-beta decay and in gamma ray imaging.

Published
2013
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9. Project X: Physics Opportunities

Author

Kronfeld, Andreas S., Tschirhart, Robert S., Al-Binni, Usama, Altmannshofer, Wolfgang, Ankenbrandt, Charles, Babu, Kaladi, Banerjee, Sunanda, Bass, Matthew, Batell, Brian, Baxter, David V., Berezhiani, Zurab, Bergevin, Marc, Bernstein, Robert, Bhattacharya, Sudeb, Bishai, Mary, Blum, Thomas, Bogacz, S. Alex, Brice, Stephen J., Brod, Joachim, Bross, Alan, Buchoff, Michael, Burgess, Thomas W., Carena, Marcela, Castellanos, Luis A., Chattopadhyay, Subhasis, Chen, Mu-Chun, Cherdack, Daniel, Christ, Norman H., Chupp, Tim, Cirigliano, Vincenzo, Coloma, Pilar, Coppola, Christopher E., Cowsik, Ramanath, Crabtree, J. Allen, de Gouvêa, André, Delahaye, Jean-Pierre, Denisov, Dmitri, deNiverville, Patrick, Dharmapalan, Ranjan, Diefenthaler, Markus, Dolgov, Alexander, Dvali, Georgi, Eichten, Estia, Engelfried, Jürgen, Ferguson, Phillip D., Gabriel, Tony, Gal, Avraham, Gallmeier, Franz, Ganezer, Kenneth S., Gardner, Susan, Glenzinski, Douglas, Godfrey, Stephen, Golubeva, Elena S., Gori, Stefania, Graves, Van B., Greene, Geoffrey, Griffard, Cory L., Haisch, Ulrich, Handler, Thomas, Hartfiel, Brandon, Hatzikoutelis, Athanasios, Hawari, Ayman, Heilbronn, Lawrence, Hill, James E., Huber, Patrick, Jaffe, David E., Jiang, Xiaodong, Johnson, Christian, Kamyshkov, Yuri, Kaplan, Daniel M., Kerbikov, Boris, Kiburg, Brendan, Kirk, Harold G., Klein, Andreas, Knoepfel, Kyle, Kopeliovich, Boris, Kopeliovich, Vladimir, Kopp, Joachim, Korsch, Wolfgang, Kribs, Graham, Lipton, Ronald, Liu, Chen-Yu, Lorenzon, Wolfgang, Lu, Zheng-Tian, Makins, Naomi C. R., McKeen, David, Mills, Geoffrey, Mocko, Michael, Mohapatra, Rabindra, Mokhov, Nikolai V., Muhrer, Guenter, Mumm, Pieter, Neuffer, David, Okun, Lev, Palmer, Mark A., Palmer, Robert, Pattie Jr., Robert W., Phillips II, David G., Pitts, Kevin, Pospelov, Maxim, Pronskikh, Vitaly S., Quigg, Chris, Ramberg, Erik, Ray, Amlan, Reimer, Paul E., Richards, David G., Ritz, Adam, Roy, Amit, Ruggles, Arthur, Ryne, Robert, Sarkar, Utpal, Saunders, Andy, Semertzidis, Yannis K., Serebrov, Anatoly, Shimizu, Hirohiko, Shrock, Robert, Sikdar, Arindam K., Snopok, Pavel V., Snow, William M., Soha, Aria, Spanier, Stefan, Striganov, Sergei, Tang, Zhaowen, Townsend, Lawrence, Urheim, Jon, Vainshtein, Arkady, Van de Water, Richard, Van de Water, Ruth S., Van Kooten, Richard J., Wehring, Bernard, Wester III, William C., Whitehead, Lisa, Wilson, Robert J., Worcester, Elizabeth, Young, Albert R., and Zeller, Geralyn

Subjects
High Energy Physics - Experiment, High Energy Physics - Lattice, High Energy Physics - Phenomenology, Nuclear Experiment, Nuclear Theory, Physics - Accelerator Physics
Abstract

Part 2 of "Project X: Accelerator Reference Design, Physics Opportunities, Broader Impacts". In this Part, we outline the particle-physics program that can be achieved with Project X, a staged superconducting linac for intensity-frontier particle physics. Topics include neutrino physics, kaon physics, muon physics, electric dipole moments, neutron-antineutron oscillations, new light particles, hadron structure, hadron spectroscopy, and lattice-QCD calculations. Part 1 is available as arXiv:1306.5022 [physics.acc-ph] and Part 3 is available as arXiv:1306.5024 [physics.acc-ph]., Comment: 209 pp. with many figures; prepared in part for the DPF Community Summer Study; v2 corrects typos (including one author surname), adds an author, and conforms with the version being printed; v3 includes two more chapter authors in full list at the top

Published
2013

10. Investigating reciprocity failure in 1.7-micron cut-off HgCdTe detectors

Author

Schubnell, Michael, Biesiadzinski, Tomasz, Lorenzon, Wolfgang, Newman, Robert, and Tarle, Greg

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Flux dependent non-linearity (reciprocity failure) in HgCdTe NIR detectors with 1.7 micron cut-off was investigated. A dedicated test station was designed and built to measure reciprocity failure over the full dynamic range of near infrared detectors. For flux levels between 1 and 100,000 photons/sec a limiting sensitivity to reciprocity failure of 0.3%/decade was achieved. First measurements on several engineering grade 1.7 micron cut-off HgCdTe detectors show a wide range of reciprocity failure, from less than 0.5%/decade to about 10%/decade. For at least two of the tested detectors, significant spatial variation in the effect was observed. No indication for wavelength dependency was found. The origin of reciprocity failure is currently not well understood. In this paper we present details of our experimental set-up and show the results of measurements for several detectors., Comment: 11 pages, 10 figures, to appear in " Astronomical Telescopes and Instrumentation: High Energy, Optical, and Infrared Detectors for Astronomy IV", Proceedings of SPIE Vol. 7742

Published
2010
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11. Pentaquark Search at HERMES

Author

Lorenzon, Wolfgang

Subjects
High Energy Physics - Experiment
Abstract

Evidence for a narrow baryon state at 1528 +- 2.6(stat) +- 2.1(syst) MeV is presented in quasi-real photoproduction on a deuterium target through the decay channel p,K0 to p,pi+,pi-. The statistical significance of the peak in the p,K0 invariant mass spectrum is 4 standard deviations and its extracted intrinsic width Gamma = 17 +- 9(stat) +- 3(syst) MeV. This state may be interpreted as the predicted S=+1 exotic Theta+ (uudd\bar{s}) pentaquark baryon., Comment: 9 pages, 6 figures, International Workshop PENTAQUARK04, SPring-8, Japan, July 2004

Published
2004
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12. Improved Spatial Resolution in Thick, Fully-Depleted CCDs with Enhanced Red Sensitivity

Author

Fairfield, Jessamyn A., Groom, Donald E., Bailey, Stephen J., Bebek, Christopher J., Holland, Stephen E., Karcher, Armin, Kolbe, William F., Lorenzon, Wolfgang, and Roe, Natalie A.

Subjects
Instrumentation related to nuclear science and technology, charge coupled device diffusion processes high-resistivity silicon optical transfer functions
Published
2008

14. An Electromagnetic Induction Flashlight Experiment

Author

Alden, Emily, Kennedy, Mark, and Lorenzon, Wolfgang

Abstract

In the last several years, the electronics industry has released hand generator-powered flashlights, which are advertised as the end of battery-powered flashlights. This has become possible because of recent advances in capacitor, magnet, and LED technology. Nevertheless, the physics behind these flashlights is fairly simple.

Published
2007
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15. First dark matter search results from the PandaX-I experiment

Author

Xiao, MengJiao, Xiao, Xiang, Zhao, Li, Cao, XiGuang, Chen, Xun, Chen, YunHua, Cui, XiangYi, Fang, DeQing, Fu, ChangBo, Giboni, Karl L., Gong, HaoWei, Guo, GuoDong, Hu, Jie, Huang, XingTao, Ji, XiangDong, Ju, YongLin, Lei, SiAo, Li, ShaoLi, Lin, Qing, Liu, HuaXuan, Liu, JiangLai, Liu, Xiang, Lorenzon, Wolfgang, Ma, YuGang, Mao, YaJun, Ni, KaiXuan, Pushkin, Kirill, Ren, XiangXiang, Schubnell, Michael, Shen, ManBing, Stephenson, Scott, Tan, AnDi, Tarlé, Greg, Wang, HongWei, Wang, JiMin, Wang, Meng, Wang, XuMing, Wang, Zhou, Wei, YueHuan, Wu, ShiYong, Xie, PengWei, You, YingHui, Zeng, XiongHui, Zhang, Hua, Zhang, Tao, Zhu, ZhongHua, and The PandaX Collaboration

Published
2014
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17. PandaX: a liquid xenon dark matter experiment at CJPL

Author

Cao, XiGuang, Chen, Xun, Chen, YunHua, Cui, XiangYi, Fang, DeQing, Fu, ChangBo, Giboni, Karl L., Gong, HaoWei, Guo, GuoDong, He, Ming, Hu, Jie, Huang, XingTao, Ji, XiangDong, Ju, YongLin, Li, ShaoLi, Lin, Qing, Liu, HuaXuan, Liu, JiangLai, Liu, Xiang, Lorenzon, Wolfgang, Ma, YuGang, Mao, YaJun, Ni, KaiXuan, Pushkin, Kirill, Ren, XiangXiang, Schubnell, Michael, Shen, ManBing, Shi, YuJie, Stephenson, Scott, Tan, AnDi, Tarlé, Greg, Wang, HongWei, Wang, JiMing, Wang, Meng, Wang, XuMing, Wang, Zhou, Wei, YueHuan, Wu, ShiYong, Xiao, MengJiao, Xiao, Xiang, Xie, PengWei, Ye, Tao, You, YingHui, Zen, XiongHui, Zhang, Hua, Zhang, Tao, Zhao, HaiYing, Zhao, Li, Zhou, XiaoPeng, and Zhu, ZhongHua

Published
2014
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18. An electromagnetic induction flashlight experiment

Author

Alden, Emily, Kennedy, Mark, Lorenzon, Wolfgang, and Smith, Warren

Subjects
Capacitors -- Usage, Energy transformation -- Study and teaching, Flashlights -- Design and construction, Electricity -- Study and teaching, Electric generators -- Usage, Light-emitting diodes -- Usage, Electric current rectifiers -- Usage, Rectifier instruments -- Usage, Education, Physics
Abstract

A shaker flashlight is made using a hand generator, a light emitting diode, a capacitor, a switch, and a full-wave bridge rectifier. Design of the flashlight involves the understanding of conversion of mechanical energy to electrical energy and the storage of electrical energy.

Published
2007

19. Polarization and relaxation of 209Rn

Author

Tardiff, Eric R., Chupp, Timothy E., Lorenzon, Wolfgang, Nuss-Warren, Sarah R., Behr, John A., Pearson, Matthew R., Gulyuz, Kerim, Lefferts, Richard S., Pietralla, Norbert, Rainovski, Georgi, Sell, Jerry F., and Sprouse, Gene D.

Published
2007
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20. Reduced charge diffusion in thick, fully depleted CCDs with enhanced red sensitivity

Author

Fairfield, Jessamyn A., Groom, Donald E., Bailey, Stephen J., Bebek, Christopher J., Holland, Stephen E., Karcher, Armin, Koble, William F., Lorenzon, Wolfgang, and Roe, Natalie A.

Subjects
Charge coupled devices -- Research, Diffusion processes -- Research, Silicon -- Properties, Business, Electronics, Electronics and electrical industries
Abstract

Lateral charge diffusion in charge-coupled devices (CCDs) dominates the device point-spread function (PSF), which can affect both image quality and spectroscopic resolution. We present new data and theoretical interpretations for lateral charge diffusion in thick, fully depleted CCDs developed at Lawrence Berkeley National Laboratory (LBNL). Because they can be overdepleted, the LBNL devices have no field-free region and diffusion is controlled through the application of an external bias voltage. Recent improvements in CCD design at LBNL allow the application of bias voltages exceeding 200 V. We give results for a 3512 x 3512 format, 10.5 [micro]m pixel back-illuminated p-channel CCD developed for the SuperNova/Acceleration Probe (SNAP), a proposed satellite-based experiment designed to study dark energy. Lateral charge diffusion, which is well described by a symmetric two-dimensional (2-D) Gaussian function, was measured at substrate bias voltages between 3 and 115 V. At a bias voltage of 115 V, we measure a root-mean square (rms) diffusion of 3.7 [+ or -] 0.2[micro]m. Lateral charge diffusion in LBNL CCDs will meet the SNAP requirements. Index Terms--Charge-coupled device (CCD), diffusion processes, high-resistivity silicon, optical transfer functions.

Published
2006

22. Spin tracking of polarized protons in the Main Injector at Fermilab

Author

Xiao, Meiqin, Aldred, Callum, and Lorenzon, Wolfgang

Subjects
Accelerator Physics (physics.acc-ph), FOS: Physical sciences, Physics::Accelerator Physics, Physics - Accelerator Physics, 7. Clean energy, Beam Dynamics in Rings, 3. Good health, Accelerator Physics
Abstract

The Main Injector (MI) at Fermilab currently produces high-intensity beams of protons at energies of 120 GeV for a variety of physics experiments. Acceleration of polarized protons in the MI would provide opportunities for a rich spin physics program at Fermilab. To achieve polarized proton beams in the Fermilab accelerator com-plex, shown in Fig.1.1, detailed spin tracking simulations with realistic parameters based on the existing facility are required. This report presents studies at the MI using a single 4-twist Siberian snake to determine the depolariz-ing spin resonances for the relevant synchrotrons. Results will be presented first for a perfect MI lattice, followed by a lattice that includes the real MI imperfections, such as the measured magnet field errors and quadrupole misa-lignments. The tolerances of each of these factors in maintaining polarization in the Main Injector will be discussed., Proceedings of the 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, HB2016, Malmö, Sweden

Published
2017

24. Dark Matter Results from First 98.7-day Data of PandaX-II Experiment

Author

II Collaboration, Tan, Andi, Xiao, Mengjiao, Cui, Xiangyi, Chen, Xun, Chen, Yunhua, Fang, Deqing, Fu, Changbo, Giboni, Karl, Giuliani, Franco, Gong, Haowei, Hu, Shouyang, Huang, Xingtao, Ji, Xiangdong, Ju, Yonglin, Lei, Siao, Li, Shaoli, Li, Xiaomei, Li, Xinglong, Liang, Hao, Lin, Qing, Liu, Huaxuan, Liu, Jianglai, Lorenzon, Wolfgang, Ma, Yugang, Mao, Yajun, Ni, Kaixuan, Ren, Xiangxiang, Schubnell, Michael, Shen, Manbin, Shi, Fang, Wang, Hongwei, Wang, Jiming, Wang, Meng, Wang, Qiuhong, Wang, Siguang, Wang, Xuming, Wang, Zhou, Wu, Shiyong, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yang, Yong, Yue, Jianfeng, Zeng, Xionghui, Zhang, Hongguang, Zhang, Hua, Zhang, Huanqiao, Zhang, Tao, Zhao, Li, Zhou, Jing, Zhou, Ning, and Zhou, Xiaopeng

Subjects
High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), High Energy Physics - Experiment
Abstract

We report the WIMP dark matter search results using the first physics-run data of the PandaX-II 500 kg liquid xenon dual-phase time-projection chamber, operating at the China JinPing Underground Laboratory. No dark matter candidate is identified above background. In combination with the data set during the commissioning run, with a total exposure of 3.3$\times10^4$ kg-day,the most stringent limit to the spin-independent interaction between the ordinary and WIMP dark matter is set for a range of dark matter mass between 3.5 and 1000 GeV/c$^2$. The best upper limit on the scattering cross section is found $2.5\times 10^{-46}$ cm$^2$ for the WIMP mass 40 GeV/c$^2$ at 90% confidence level., version accepted by PRL, 12 pages, 5+11 figures (including supplementary materials), 4 tables

Published
2016

28. Status of the Dark Energy Survey Camera (DECam) project

Author

Flaugher, Brenna L., primary, Abbott, Timothy M. C., additional, Angstadt, Robert, additional, Annis, Jim, additional, Antonik, Michelle L., additional, Bailey, Jim, additional, Ballester, Otger, additional, Bernstein, Joseph P., additional, Bernstein, Rebecca A., additional, Bonati, Marco, additional, Bremer, Gale, additional, Briones, Jorge, additional, Brooks, David, additional, Buckley-Geer, Elizabeth J., additional, Campa, Juila, additional, Cardiel-Sas, Laia, additional, Castander, Francisco, additional, Castilla, Javier, additional, Cease, Herman, additional, Chappa, Steve, additional, Chi, Edward C., additional, da Costa, Luis, additional, DePoy, Darren L., additional, Derylo, Gregory, additional, de Vincente, Juan, additional, Diehl, H. Thomas, additional, Doel, Peter, additional, Estrada, Juan, additional, Eiting, Jacob, additional, Elliott, Anne E., additional, Finley, David A., additional, Flores, Rolando, additional, Frieman, Josh, additional, Gaztanaga, Enrique, additional, Gerdes, David, additional, Gladders, Mike, additional, Guarino, V., additional, Gutierrez, G., additional, Grudzinski, Jim, additional, Hanlon, Bill, additional, Hao, Jiangang, additional, Holland, Steve, additional, Honscheid, Klaus, additional, Huffman, Dave, additional, Jackson, Cheryl, additional, Jonas, Michelle, additional, Karliner, Inga, additional, Kau, Daekwang, additional, Kent, Steve, additional, Kozlovsky, Mark, additional, Krempetz, Kurt, additional, Krider, John, additional, Kubik, Donna, additional, Kuehn, Kyler, additional, Kuhlmann, Steve E., additional, Kuk, Kevin, additional, Lahav, Ofer, additional, Langellier, Nick, additional, Lathrop, Andrew, additional, Lewis, Peter M., additional, Lin, Huan, additional, Lorenzon, Wolfgang, additional, Martinez, Gustavo, additional, McKay, Timothy, additional, Merritt, Wyatt, additional, Meyer, Mark, additional, Miquel, Ramon, additional, Morgan, Jim, additional, Moore, Peter, additional, Moore, Todd, additional, Neilsen, Eric, additional, Nord, Brian, additional, Ogando, Ricardo, additional, Olson, Jamieson, additional, Patton, Kenneth, additional, Peoples, John, additional, Plazas, Andres, additional, Qian, Tao, additional, Roe, Natalie, additional, Roodman, Aaron, additional, Rossetto, B., additional, Sanchez, E., additional, Soares-Santos, Marcelle, additional, Scarpine, Vic, additional, Schalk, Terry, additional, Schindler, Rafe, additional, Schmidt, Ricardo, additional, Schmitt, Richard, additional, Schubnell, Mike, additional, Schultz, Kenneth, additional, Selen, M., additional, Serrano, Santiago, additional, Shaw, Terri, additional, Simaitis, Vaidas, additional, Slaughter, Jean, additional, Smith, R. Christopher, additional, Spinka, Hal, additional, Stefanik, Andy, additional, Stuermer, Walter, additional, Sypniewski, Adam, additional, Talaga, R., additional, Tarle, Greg, additional, Thaler, Jon, additional, Tucker, Doug, additional, Walker, Alistair R., additional, Weaverdyck, Curtis, additional, Wester, William, additional, Woods, Robert J., additional, Worswick, Sue, additional, and Zhao, Allen, additional

Published
2012
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29. Status of the dark energy survey camera (DECam) project

Author

Flaugher, Brenna L., primary, Abbott, Timothy M. C., additional, Annis, Jim, additional, Antonik, Michelle L., additional, Bailey, Jim, additional, Ballester, Otger, additional, Bernstein, Joseph P., additional, Bernstein, Rebecca, additional, Bonati, Marco, additional, Bremer, Gale, additional, Briones, Jorge, additional, Brooks, David, additional, Buckley-Geer, Elizabeth J., additional, Campa, Julia, additional, Cardiel-Sas, Laia, additional, Castander, Francisco, additional, Castilla, Javier, additional, Cease, Herman, additional, Chappa, Steve, additional, Chi, Edward C., additional, da Costa, Luis, additional, DePoy, Darren L., additional, Derylo, Gregory, additional, De Vicente, Juan, additional, Diehl, H. Thomas, additional, Doel, Peter, additional, Estrada, Juan, additional, Eiting, Jacob, additional, Elliott, Anne, additional, Finley, David, additional, Frieman, Josh, additional, Gaztanaga, Enrique, additional, Gerdes, David, additional, Gladders, Mike, additional, Guarino, V., additional, Gutierrez, G., additional, Grudzinski, Jim, additional, Hanlon, Bill, additional, Hao, Jiangang, additional, Holland, Steve, additional, Honscheid, Klaus, additional, Huffman, Dave, additional, Jackson, Cheryl, additional, Karliner, Inga, additional, Kau, Daekwang, additional, Kent, Steve, additional, Krempetz, Kurt, additional, Krider, John, additional, Kozlovsky, Mark, additional, Kubik, Donna, additional, Kuehn, Kyler W., additional, Kuhlmann, Stephen E., additional, Kuk, Kevin, additional, Lahav, Ofer, additional, Lewis, Peter, additional, Lin, Huan, additional, Lorenzon, Wolfgang, additional, Marshall, Stuart, additional, Martínez, Gustavo, additional, McKay, Timothy, additional, Merritt, Wyatt, additional, Meyer, Mark, additional, Miquel, Ramon, additional, Morgan, Jim, additional, Moore, Peter, additional, Moore, Todd, additional, Nord, Brian, additional, Ogando, R., additional, Olsen, Jamieson, additional, Peoples, John, additional, Plazas, Andreas, additional, Roe, Natalie, additional, Roodman, Aaron, additional, Rossetto, B., additional, Sanchez, E., additional, Scarpine, Vic, additional, Schalk, Terry, additional, Schindler, Rafe, additional, Schmidt, Ricardo, additional, Schmitt, Richard, additional, Schubnell, Mike, additional, Schultz, Kenneth, additional, Selen, M., additional, Serrano, S., additional, Shaw, Terri, additional, Simaitis, Vaidis, additional, Slaughter, Jean, additional, Smith, R. Christopher, additional, Spinka, Hal, additional, Stefanik, Andy, additional, Stuermer, Walter, additional, Sypniewski, Adam, additional, Talaga, Rick, additional, Tarle, Greg, additional, Thaler, Jon, additional, Tucker, Doug, additional, Walker, Alistair R., additional, Weaverdyck, Curtis, additional, Wester, William, additional, Woods, Robert J., additional, Worswick, Sue, additional, and Zhao, Allen, additional

Published
2010
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33. Project X: Physics Opportunities

Author

Kronfeld, Andreas S., Tschirhart, Robert S., Al-Binni, Usama, Altmannshofer, Wolfgang, Ankenbrandt, Charles, Babu, Kaladi, Banerjee, Sunanda, Bass, Matthew, Batell, Brian, Baxter, David V., Berezhiani, Zurab, Bergevin, Marc, Bernstein, Robert, Bhattacharya, Sudeb, Bishai, Mary, Blum, Thomas, Bogacz, S. Alex, Brice, Stephen J., Brod, Joachim, Bross, Alan, Buchoff, Michael, Burgess, Thomas W., Carena, Marcela, Castellanos, Luis A., Chattopadhyay, Subhasis, Chen, Mu-Chun, Cherdack, Daniel, Christ, Norman H., Chupp, Tim, Cirigliano, Vincenzo, Pilar Coloma, Coppola, Christopher E., Cowsik, Ramanath, Crabtree, J. Allen, Delahaye, Jean-Pierre, Denisov, Dmitri, Deniverville, Patrick, Gouvêa, André, Dharmapalan, Ranjan, Diefenthaler, Markus, Dolgov, Alexander, Dvali, Georgi, Eichten, Estia, Engelfried, Jürgen, Ferguson, Phillip D., Gabriel, Tony, Gal, Avraham, Gallmeier, Franz, Ganezer, Kenneth S., Gardner, Susan, Glenzinski, Douglas, Godfrey, Stephen, Golubeva, Elena S., Gori, Stefania, Graves, B., Greene, Geoffrey, Griffard, Cory L., Haisch, Ulrich, Handler, Thomas, Hartfiel, Brandon, Hawari, Ayman, Heilbronn, Lawrence, Hill, James E., Huber, Patrick, Jaffe, David E., Jiang, Xiaodong, Johnson, Christian, Kamyshkov, Yuri, Kaplan, Daniel M., Kerbikov, Boris, Kiburg, Brendan, Kirk, Harold G., Klein, Andreas, Knoepfel, Kyle, Kopeliovich, Boris, Kopeliovich, Vladimir, Kopp, Joachim, Korsch, Wolfgang, Kribs, Graham, Lipton, Ronald, Liu, Chen-Yu, Lorenzon, Wolfgang, Lu, Zheng-Tian, Makins, Naomi C. R., Mckeen, David, Mills, Geoffrey, Mohapatra, Rabindra, Mokhov, Nikolai V., Mocko, Michael, Muhrer, Guenter, Mumm, Pieter, Okun, Lev, Neuffer, David, Palmer, Mark A., Palmer, Robert, Pattie, Robert W., Phillips, David G., Pronskikh, Vitaly, Pitts, Kevin, Pospelov, Maxim, Quigg, Chris, Ramberg, Erik, Ray, Amlan, Reimer, Paul E., Richards, David G., Ritz, Adam, Roy, Amit, Ruggles, Arthur, Ryne, Robert, Sarkar, Utpal, Saunders, Andy, Semertzidis, Yannis K., Serebrov, Anatoly, Shimizu, Hirohiko, Shrock, Robert, Snopok, Pavel V., Snow, William M., Sikdar, Arindam K., Soha, Aria, Spanier, Stefan, Striganov, Sergei, Tang, Zhaowen, Townsend, Lawrence, Urheim, Jon, Vainshtein, Arkady, Kooten, Richard J., Water, Richard, Water, Ruth S., Wehring, Bernard, Whitehead, Lisa, Wilson, Robert J., Worcester, Elizabeth, Young, Albert R., Wester, William C., and Zeller, Geralyn

34. Seeing the Nature of the Accelerating Physics: It's a SNAP

Author

Albert, J., Aldering, G., Allam, Sahar S., Althouse, W., Amanullah, R., Annis, J., Astier, P., Aumeunier, M., Bailey, S., Baltay, C., Barrelet, E., Basa, S., Bebek, C., Bergstom, L., Bernstein, G., Bester, M., Besuner, B., Bigelow, B., Blandford, R., Bohlin, R., Bonissent, Alain, Bower, C., Brown, M., Campbell, M., Carithers, William C., Cole, D., Commins, E., Craig, W., Davis, T., Dawson, K., Day, C., Deharveng, M., Dejongh, Don Frederic, Deustua, S., Diehl, H., Dobson, T., Dodelson, Scott, Ellis, R., Emmet, W., Figer, D., Fouchez, Dominique, Frerking, M., Frieman, Joshua A., Fruchter, A., Gerdes, David W., Gladney, Larry D., Goldhaber, Gerson, Goobar, A., Groom, Donald Eugene, Heetderks, H., Hoff, M., Holland, S., Huffer, M., Hui, L., Huterer, Dragan, Jain, B., Jelinsky, P., Juramy, C., Karcher, A., Kent, S., Kahn, S., Kim, A., Kolbe, W., Krieger, B., Kushner, G., Kuznetsova, N., Lafever, R., Lamoureux, J., Lampton, M., Le Fevre, O., Lebrun, V., Levi, Michael Edward, Limon, P., Lin, H., Linder, Eric, Loken, S., Lorenzon, Wolfgang B., Malina, R., Marian, Laura, Marriner, J., Marshall, P., Massey, R., Mazure, A., Mcginnis, B., Mckay, T., Mckee, S., Miquel, Ramon, Mobasher, B., Morgan, N., Edvard Mörtsell, Mostek, N., Mufson, Stuart Lee, Musser, J., Nakajima, R., Nugent, P., Oluseyi, H., Pain, Reynald, Palaio, N., Pankow, D., Peoples, John, Perlmutter, Saul, Peterson, D., Prieto, E., Rabinowitz, D., Refregier, A., Rhodes, J., Roe, Natalie A., Rusin, D., Scarpine, V., Schubnell, Michael Siegfried Georg, Seiffert, M., Sholl, M., Shukla, H., Smadja, G., Smith, R. M., Smoot, George F., Snyder, J., Spadafora, Anthony L., Stabenau, F., Stebbins, Albert, Stoughton, C., Szymkowiak, A., Tarle, G., Taylor, K., Tilquin, A., Tomasch, A., Tucker, Douglas L., Vincent, D., Lippe, H., Walder, J-P, Wang, G., Weinstein, A., Wester, William Carl, and White, Martin J.

35. Probing dark energy via weak gravitational lensing with the Supernova Acceleration Probe (SNAP)

Author

Albert, J., Aldering, G., Allam, Sahar S., Althouse, W., Amanullah, R., Annis, J., Astier, P., Aumeunier, M., Bailey, S., Baltay, C., Barrelet, E., Basa, S., Bebek, C., Bergstom, L., Bernstein, G., Bester, M., Besuner, B., Bigelow, B., Blandford, R., Bohlin, R., Bonissent, Alain, Bower, C., Brown, M., Campbell, M., Carithers, William C., Cole, D., Commins, E., Craig, W., Davis, T., Dawson, K., Day, C., Deharveng, M., Dejongh, Don Frederic, Deustua, S., Diehl, H., Dobson, T., Dodelson, Scott, Ealet, Anne, Ellis, R., Emmet, W., Figer, D., Fouchez, Dominique, Frerking, M., Frieman, Joshua A., Fruchter, A., Gerdes, David W., Gladney, Larry D., Goldhaber, Gerson, Goobar, A., Groom, Donald Eugene, Heetderks, H., Hoff, M., Holland, S., Huffer, M., Hui, L., Huterer, Dragan, Jain, B., Jelinsky, P., Juramy, C., Karcher, A., Kent, S., Kahn, S., Kim, A., Kolbe, W., Krieger, B., Kushner, G., Kuznetsova, N., Lafever, R., Lamoureux, J., Lampton, M., Le Fevre, O., Lebrun, V., Levi, Michael Edward, Limon, P., Lin, H., Linder, Eric, Loken, S., Lorenzon, Wolfgang B., Malina, R., Marian, Laura, Marriner, J., Marshall, P., Massey, R., Mazure, A., Mcginnis, B., Mckay, T., Mckee, S., Miquel, Ramon, Mobasher, B., Morgan, N., Edvard Mörtsell, Mostek, N., Mufson, Stuart Lee, Musser, J., Nakajima, R., Nugent, P., Oluseyi, H., Pain, Reynald, Palaio, N., Pankow, D., Peoples, John, Perlmutter, Saul, Peterson, D., Prieto, E., Rabinowitz, D., Refregier, A., Rhodes, J., Roe, Natalie A., Rusin, D., Scarpine, V., Schubnell, M., Seiffert, M., Sholl, M., Shukla, H., Smadja, G., Smith, R. M., Smoot, George F., Snyder, J., Spadafora, Anthony L., Stabenau, F., Stebbins, Albert, Stoughton, C., Szymkowiak, A., Tarle, G., Taylor, K., Tilquin, A., Tomasch, A., Tucker, Douglas L., Vincent, D., Lippe, H., Walder, J-P, Wang, G., Weinstein, A., Wester, William Carl, and White, Martin J.

36. Polarization and relaxation of 209Rn

Author

Tardiff, Eric R., Chupp, Timothy E., Lorenzon, Wolfgang, Nuss-Warren, Sarah R., Behr, John A., Pearson, Matthew R., Gulyuz, Kerim, Lefferts, Richard S., Pietralla, Norbert, Rainovski, Georgi, Sell, Jerry F., and Sprouse, Gene D.

Subjects
*POLARIZATION (Nuclear physics), *RADON, *DIPOLE moments, *DIELECTRICS
Abstract

Abstract: The study of the nuclear polarization of radon is motivated by the expected large enhancement of sensitivity to a CP-violating electric dipole moment (EDM) in isotopes with octupole deformation or vibrational strength. In preparation for EDM measurements, the polarization of radon by spin exchange with laser-polarized alkali metals is studied. The measurement of the alignment of 209Rn using HPGe detectors to observe the resulting anisotropy in the 337 and 745keV gamma rays emitted following electron-capture decay of 209Rn to 209At is demonstrated. Radon is polarized via spin-exchange collisions with rubidium atoms in an uncoated Pyrex optical pumping cell. Anisotropy measurements at several temperatures are used to study polarization and relaxation. [Copyright &y& Elsevier]

Published
2007
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37. Low-mass dark matter search results from full exposure of the PandaX-I experiment.

Author

Xiang Xiao, Xun Chen, Tan, Andi, Yunhua Chen, Xiangyi Cui, Deqing Fang, Changbo Fu, Giboni, Karl L., Haowei Gong, Guodong Guo, Ming He, Xiangdong Ji, Yonglin Ju, Siao Lei, Shaoli Li, Qing Lin, Huaxuan Liu, Jianglai Liu, Xiang Liu, and Lorenzon, Wolfgang

Subjects
*DARK matter, *WEAKLY interacting massive particles, *STANDARD model (Nuclear physics)
Abstract

We report the results of a weakly interacting massive particle (WIMP) dark matter search using the full 80.1 live-day exposure of the first stage of the PandaX experiment (PandaX-I) located in the China Jin-Ping Underground Laboratory. The PandaX-I detector has been optimized for detecting low-mass WIMPs, achieving a photon detection efficiency of 9.6%. With a fiducial liquid xenon target mass of 54.0 kg, no significant excess events were found above the expected background. A profile likelihood ratio analysis confirms our earlier finding that the PandaX-I data disfavor all positive low-mass WIMP signals reported in the literature under standard assumptions. A stringent bound on a low-mass WIMP is set at a WIMP mass below 10 GeV/c², demonstrating that liquid xenon detectors can be competitive for low-mass WIMP searches. [ABSTRACT FROM AUTHOR]

Published
2015
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38. Dark Matter Results from First 98.7 Days of Data from the PandaX-II Experiment.

Author

Tan A, Xiao M, Cui X, Chen X, Chen Y, Fang D, Fu C, Giboni K, Giuliani F, Gong H, Guo X, Han K, Hu S, Huang X, Ji X, Ju Y, Lei S, Li S, Li X, Li X, Liang H, Lin Q, Liu H, Liu J, Lorenzon W, Ma Y, Mao Y, Ni K, Ren X, Schubnell M, Shen M, Shi F, Wang H, Wang J, Wang M, Wang Q, Wang S, Wang X, Wang Z, Wu S, Xiao X, Xie P, Yan B, Yang Y, Yue J, Zeng X, Zhang H, Zhang H, Zhang H, Zhang T, Zhao L, Zhou J, Zhou N, and Zhou X

Abstract

We report the weakly interacting massive particle (WIMP) dark matter search results using the first physics-run data of the PandaX-II 500 kg liquid xenon dual-phase time-projection chamber, operating at the China JinPing underground laboratory. No dark matter candidate is identified above background. In combination with the data set during the commissioning run, with a total exposure of 3.3×10^{4}  kg day, the most stringent limit to the spin-independent interaction between the ordinary and WIMP dark matter is set for a range of dark matter mass between 5 and 1000  GeV/c^{2}. The best upper limit on the scattering cross section is found 2.5×10^{-46}  cm^{2} for the WIMP mass 40  GeV/c^{2} at 90% confidence level.

Published
2016
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