共查询到20条相似文献,搜索用时 343 毫秒
1.
D. R. Tovey C. D. Peak J. W. Roberts N. J. C. Spooner 《Nuclear Physics B - Proceedings Supplements》1999,70(1-3)
We present the results of development work on the CASPAR (‘Cocktail with Alkali-halide Scintillating PARticles’) WIMP Dark Matter detector. The results of Monte Carlo simulations and neutron-scattering tests indicate that even a modest sized detector should provide improved spin-dependent WIMP sensitivity. 相似文献
2.
杨丽桃 李浩斌 岳骞 康克军 程建平 李元景 王子敬 M.Agartioglu 安海鹏 常建平 陈景瀚 陈云华 邓智 杜强 宫辉 何力 胡津纬 胡庆东 黄瀚雄 贾历平 江灏 李红 李荐民 李金 李霞 李学潜 李玉兰 林枫凯 林兴德 刘书魁 刘仲智 马豪 马菁露 潘辉 任杰 阮锡超 B.Sevda Vivek Sharma 申满斌 Lakhwinder Singh Manoj Kumar Singh 唐昌建 唐维优 田阳 王继敏 王力 王青 王轶 吴世勇 吴玉成 幸浩洋 徐音 薛涛 杨松伟 易难 喻纯旭 于海军 岳剑峰 曾雄辉 曾鸣 曾志 张云华 赵明刚 赵伟 周济芳 周祖英 朱敬军 朱忠华 《中国物理C(英文版)》2018,(2)
We report results of a search for light weakly interacting massive particle(WIMP) dark matter from the CDEX-1 experiment at the China Jinping Underground Laboratory(CJPL). Constraints on WIMP-nucleon spin-independent(SI) and spin-dependent(SD) couplings are derived with a physics threshold of 160 eVee, from an exposure of 737.1 kg-days. The SI and SD limits extend the lower reach of light WIMPs to 2 GeV and improve over our earlier bounds at WIMP mass less than 6 GeV. 相似文献
3.
Kim SC Bhang H Choi JH Kang WG Kim BH Kim HJ Kim KW Kim SK Kim YD Lee J Lee JH Lee JK Lee MJ Lee SJ Li J Li J Li XR Li YJ Myung SS Olsen SL Ryu S Seong IS So JH Yue Q;KIMS Collaboration 《Physical review letters》2012,108(18):181301
New limits are presented on the cross section for weakly interacting massive particle (WIMP) nucleon scattering in the KIMS CsI(T?) detector array at the Yangyang Underground Laboratory. The exposure used for these results is 24?524.3 kg·days. Nuclei recoiling from WIMP interactions are identified by a pulse shape discrimination method. A low energy background due to alpha emitters on the crystal surfaces is identified and taken into account in the analysis. The detected numbers of nuclear recoils are consistent with zero and 90% confidence level upper limits on the WIMP interaction rates are set for electron equivalent energies from 3 to 11 keV. The 90% upper limit of the nuclear recoil event rate for 3.6-5.8 keV corresponding to 2-4 keV in NaI(T?) is 0.0098 counts/kg/keV/day, which is below the annual modulation amplitude reported by DAMA. This is incompatible with interpretations that enhance the modulation amplitude such as inelastic dark matter models. We establish the most stringent cross section limits on spin-dependent WIMP-proton elastic scattering for the WIMP masses greater than 20 GeV/c2. 相似文献
4.
Behnke E Behnke J Brice SJ Broemmelsiek D Collar JI Cooper PS Crisler M Dahl CE Fustin D Hall J Hinnefeld JH Hu M Levine I Ramberg E Shepherd T Sonnenschein A Szydagis M;COUPP Collaboration 《Physical review letters》2011,106(2):021303
Data from the operation of a bubble chamber filled with 3.5 kg of CF3I in a shallow underground site are reported. An analysis of ultrasound signals accompanying bubble nucleations confirms that alpha decays generate a significantly louder acoustic emission than single nuclear recoils, leading to an efficient background discrimination. Three dark matter candidate events were observed during an effective exposure of 28.1 kg day, consistent with a neutron background. This observation provides strong direct detection constraints on weakly interacting massive particle (WIMP)-proton spin-dependent scattering for WIMP masses >20 GeV/c2. 相似文献
5.
O. V. Suvorova M. M. Boliev S. V. Demidov S. P. Mikheyev 《Physics of Atomic Nuclei》2013,76(11):1367-1376
The results of a neutrino experiment that involved 24.12 yr of live time of observation of muons from the lower Earth’s hemisphere with the aid of the Baksan Underground Scintillator Telescope are presented. In the problem of searches for a signal from the annihilation of dark matter in the Sun, an upper limit on the cross section for the elastic scattering of a weakly interacting massive particle (WIMP) on a nucleon was obtained at a 90% confidence level from an analysis of data accumulated within 21.15 yr of live time of observation. A neutralino in a nonminimal supersymmetric theory was considered for a WIMP. The best limit at the Baksan Underground Scintillator Telescope on the cross section for spin-dependent neutralino interactionwith a proton corresponds to 3×10?4 pb for the neutralino mass of 210 GeV/c 2. This limit is three orders of magnitude more stringent than similar limits obtained in experiments that detected directly WIMP scattering on target nuclei. 相似文献
6.
V. A. Bednyakov 《Physics of Atomic Nuclei》2004,67(11):1931-1941
The Weakly Interacting Massive Particle (WIMP) is the main candidate for the relic dark matter. A set of exclusion curves currently obtained for cross sections of spin-dependent WIMP-proton and WIMP-neutron interaction is given. A two-orders-of-magnitude improvement of the sensitivity of the dark matter experiment is needed to reach the SUSY predictions for relic neutralinos. It is noted that new experiments with the high-spin isotope 73Ge can yield a new important constraint on the neutralino-neutron effective coupling and the SUSY parameter space. 相似文献
7.
Weakly Interacting Massive Particles (WIMPs) are among the main candidates for the relic dark matter (DM). The idea of the
direct DM detection relies on elastic spin-dependent (SD) and spin-independent (SI) interaction of WIMPs with target nuclei.
In this review paper the relevant formulae for WIMP event rate calculations are collected. For estimations of the WIMP-proton
and WIMP-neutron SD and SI cross sections the effective low-energy minimal supersymmetric standard model is used. The traditional
one-coupling-dominance approach for evaluation of the exclusion curves is described. Further, the mixed spin-scalar coupling
approach is discussed. It is demonstrated, taking the high-spin 73Ge dark matter experiment HDMS as an example, how one can drastically improve the sensitivity of the exclusion curves within
the mixed spin-scalar coupling approach, as well as due to a new procedure of background subtraction from the measured spectrum.
A general discussion on the information obtained from exclusion curves is given. The necessity of clear WIMP direct detection
signatures for a solution of the dark matter problem, is pointed out. 相似文献
8.
G. Angloher M. Altmann M. Bruckmayer C. Bucci S. Cooper C. Cozzini P. Di Stefano F. von Feilitzsch T. Frank D. Hauff Th. Jagemann J. Jochum R. Keeling H. Kraus J. Macallister F. Pröbst Y. Ramachers J. Schnagl W. Seidel I. Sergeyev M. Stark L. Stodolsky H. Wulandari 《Physics of Atomic Nuclei》2003,66(3):494-496
Results of the CRESST experiment at Gran Sasso using 262-g sapphire calorimeters with tungsten phase transition thermometers are presented. Calibration and analysis methods are described. Data taken in 2000 have been used to place limits on WIMP dark matter particles in the Galactic halo. The sapphire detectors are especially sensitive to low-mass WIMPs with spin-dependent interaction and improve on existing limits in this region. 相似文献
9.
The signals observed at the direct detection experiments DAMA, CoGeNT and CRESST could be explained by light WIMPs with sizeable spin-independent cross sections with nucleons. The capture and subsequent annihilation of such particles in the Sun would induce neutrino signals in the GeV range which may be observed at Super-Kamiokande. We determine the rate of upward stopping muons and fully contained events at Super-Kamiokande for various possible WIMP annihilation channels. This allows us to provide strong constraints on the cross section of WIMPs with nucleons. We find that the DAMA and CoGeNT signals are inconsistent with standard thermal WIMPs annihilating dominantly into neutrino or tau pairs. We also provide limits for spin-dependent WIMP nucleus scattering for masses up to 80 GeV. These exclude the DAMA favored region if WIMPs annihilate even subdominantly into neutrinos, taus, bottoms or charms. 相似文献
10.
We study the prospects for detecting weakly interacting massive particles (WIMPs) in a number of phenomenological scenarios, with a detector composed of a target simultaneously sensitive to both spin-dependent and spin-independent couplings, as is the case of COUPP (Chicagoland Observatory for Underground Particle Physics). First, we show that sensitivity to both couplings optimizes chances of initial WIMP detection. Second, we demonstrate that, in case of detection, a comparison of the signal on two complementary targets, such as in COUPP CF3I and C4F10 bubble chambers, allows a significantly more precise determination of the dark matter axial and scalar couplings. This strategy would provide crucial information on the nature of the WIMPs and possibly allow discrimination between neutralino and Kaluza-Klein dark matter. 相似文献
11.
V. A. Bednyakov H. V. Klapdor-Kleingrothaus I. V. Krivosheina 《Physics of Atomic Nuclei》2008,71(1):111-116
In the mixed spin-scalar coupling approach the data from HDMS (Heidelberg Dark Matter Search) experiments performed in the
years 1996, 1997, 2001–2003 both with natural Ge and with enriched 73Ge were simultaneously analyzed. This analysis together with a new procedure for background identification and subtraction
from the measured 73Ge spectrum allowed us to obtain a significant (about one order of magnitude) improvement for the limits on the WIMP-neutron
spin-dependent coupling. As a result, the HDMS experiment is now giving the most sensitive limits on the WIMP-neutron spin
coupling for WIMP masses larger than 60–65 GeV/c
2.
The text was submitted by the authors in English. 相似文献
12.
Angle J Aprile E Arneodo F Baudis L Bernstein A Bolozdynya A Coelho LC Dahl CE DeViveiros L Ferella AD Fernandes LM Fiorucci S Gaitskell RJ Giboni KL Gomez R Hasty R Kastens L Kwong J Lopes JA Madden N Manalaysay A Manzur A McKinsey DN Monzani ME Ni K Oberlack U Orboeck J Plante G Santorelli R dos Santos JM Shagin P Shutt T Sorensen P Schulte S Winant C Yamashita M;XENON Collaboration 《Physical review letters》2008,101(9):091301
XENON10 is an experiment to directly detect weakly interacting massive particles (WIMPs), which may comprise the bulk of the nonbaryonic dark matter in our Universe. We report new results for spin-dependent WIMP-nucleon interactions with 129Xe and 131Xe from 58.6 live days of operation at the Laboratori Nazionali del Gran Sasso. Based on the nonobservation of a WIMP signal in 5.4 kg of fiducial liquid xenon mass, we exclude previously unexplored regions in the theoretically allowed parameter space for neutralinos. We also exclude a heavy Majorana neutrino with a mass in the range of approximately 10 GeV/c2-2 TeV/c2 as a dark matter candidate under standard assumptions for its density and distribution in the galactic halo. 相似文献
13.
Spin-dependent elastic scattering of weakly interacting massive dark matter particles (WIMP) off nuclei is reviewed. All available, within different nuclear models, structure functions S(q) for finite momentum transfer (q > 0) are presented. These functions describe the recoil energy dependence of the differential event rate due to the spin-dependent WIMP-nucleon interactions. This paper, together with the previous paper “Nuclear Spin Structure in Dark Matter Search: The Zero Momentum Transfer Limit,” completes our review of the nuclear spin structure calculations involved in the problem of direct dark matter search. 相似文献
14.
V. A. Bednyakov 《Physics of Particles and Nuclei》2007,38(3):326-363
Weakly interacting massive particles (WIMPs) are among the main candidates for the relic dark matter (DM). The idea of direct
DM detection relies on elastic spin-dependent (SD) and spin-independent (SI) interaction of WIMPs with target nuclei. In this
review, formulas for the DM event rate calculations are collected. The importance of the SD WIMP-nucleus interaction for reliable
DM detection is argued and the spin nuclear structure functions relevant to DM search are discussed. The effective low-energy
minimal supersymmetric standard model (MSSM) is used for calculation of the DM cross sections, provided the lightest neutralino
is the WIMP. It is shown that the absolute lower bound for the rate of direct DM detection is due to the SD WIMP-nucleon interaction
and a new-generation experiment aimed at detecting DM with sensitivity higher than 10−5 event/day/kg should have a non-zero-spin target to avoid missing of the DM signal. The mixed spin-scalar couplings approach
is argued. Prospects of DM experiments with high-spin Ge-73 are discussed in the mixed coupling scheme. The DAMA experiment
has claimed observation of WIMPs due to annual signal modulation. Some important consequences of the DAMA claim for the other
DM searches as well as for collider physics are considered.
The text was submitted by the author in English. 相似文献
15.
G. Gerbier A. Benoît L. Bergé A. Broniatowski L. Chabert B. Chambon B. Chardin M. Chapellier P. Charvin M. De Jésus H. Deschamps P. Di Stefano D. Drain L. Dumoulin S. Fiorucci J. Gascon E. Gerlic C. Goldbach M. Goyot M. Gros J. P. Hadjout S. Hervé A. Juillard A. de Lesquen J. Mallet S. Marnieros O. Martineau L. Mosca X. -F. Navick G. Nollez P. Pari C. Riccio V. Sanglard L. Schoeffel M. Stern L. Vagneron 《Physics of Atomic Nuclei》2004,67(11):2027-2031
The latest results obtained by the EDELWEISS WIMP (weakly interacting massive particles) direct detection experiment using three heat-and-ionization 320-g germanium bolometers are given. Presently the most sensitive WIMP direct detection experiment for WIMP mass >30 GeV, EDELWEISSI is testing a first region of SUSY models compatible with accelerator constraints. The status and main characteristics of EDELWEISS-II, involving in a first stage 28 germanium bolometers and able to accommodate up to 120 detectors, are briefly presented, together with neutron background estimates. 相似文献
16.
Weakly interacting massive particle (WIMP) is well known to be a good candidate for dark matter, and it is also predicted by many new physics models beyond the standard model at the TeV scale. We found that, if the WIMP is a vector particle (spin-one particle) which is associated with some gauge symmetry broken at the TeV scale, the Higgs mass is often predicted to be 120–125 GeV, which is very consistent with the result of Higgs searches recently reported by ATLAS and CMS Collaborations at the Large Hadron Collider experiment. In this Letter, we consider the vector WIMP using a non-linear sigma model in order to confirm this result as general as possible in a bottom-up approach. Near-future prospects to detect the vector WIMP at both direct and indirect detection experiments of dark matter are also discussed. 相似文献
17.
We show that self-annihilating weakly interacting massive particle (WIMP) dark matter accreted onto neutron stars may provide a mechanism to seed compact objects with long-lived lumps of strange quark matter, or strangelets, for WIMP masses above a few GeV. This effect may trigger a conversion of most of the star into a strange star. We use an energy estimate for the long-lived strangelet based on the Fermi-gas model combined with the MIT bag model to set a new limit on the possible values of the WIMP mass that can be especially relevant for subdominant species of massive neutralinos. 相似文献
18.
Akerib DS Attisha MJ Bailey CN Baudis L Bauer DA Brink PL Brusov PP Bunker R Cabrera B Caldwell DO Chang CL Cooley J Crisler MB Cushman P Daal M Dixon R Dragowsky MR Driscoll DD Duong L Ferril R Filippini J Gaitskell RJ Golwala SR Grant DR Hennings-Yeomans R Holmgren D Huber ME Kamat S Leclercq S Lu A Mahapatra R Mandic V Meunier P Mirabolfathi N Nelson H Nelson R Ogburn RW Perera TA Pyle M Ramberg E Rau W Reisetter A Ross RR Sadoulet B Sander J Savage C Schnee RW Seitz DN Serfass B 《Physical review letters》2006,96(1):011302
We report new results from the Cryogenic Dark Matter Search (CDMS II) at the Soudan Underground Laboratory. Two towers, each consisting of six detectors, were operated for 74.5 live days, giving spectrum-weighted exposures of 34 (12) kg d for the Ge (Si) targets after cuts, averaged over recoil energies 10-100 keV for a weakly interacting massive particle (WIMP) mass of 60 GeV/c2. A blind analysis was conducted, incorporating improved techniques for rejecting surface events. No WIMP signal exceeding expected backgrounds was observed. When combined with our previous results from Soudan, the 90% C.L. upper limit on the spin-independent WIMP-nucleon cross section is 1.6 x 10(-43) cm2 from Ge and 3 x 10(-42) cm2 from Si, for a WIMP mass of 60 GeV/c2. The combined limit from Ge (Si) is a factor of 2.5 (10) lower than our previous results and constrains predictions of supersymmetric models. 相似文献
19.
Abusaidi R Akerib DS Barnes PD Bauer DA Bolozdynya A Brink PL Bunker R Cabrera B Caldwell DO Castle JP Clarke RM Colling P Crisler MB Cummings A Da Silva A Davies AK Dixon R Dougherty BL Driscoll D Eichblatt S Emes J Gaitskell RJ Golwala SR Hale D Haller EE Hellmig J Huber ME Irwin KD Jochum J Lipschultz FP Lu A Mandic V Martinis JM Nam SW Nelson H Neuhauser B Penn MJ Perera TA Perillo Isaac MC Pritychenko B Ross RR Saab T Sadoulet B Schnee RW Seitz DN Shestople P Shutt T Smith A Smith GW 《Physical review letters》2000,84(25):5699-5703
The Cryogenic Dark Matter Search (CDMS) employs Ge and Si detectors to search for weakly interacting massive particles (WIMPs) via their elastic-scattering interactions with nuclei while discriminating against interactions of background particles. CDMS data, accounting for the neutron background, give limits on the spin-independent WIMP-nucleon elastic-scattering cross section that exclude unexplored parameter space above 10 GeV/c2 WIMP mass and, at >75% C.L., the entire 3sigma allowed region for the WIMP signal reported by the DAMA experiment. 相似文献
20.
W. Seidel M. Bravin M. Bruckmayer C. Bucci S. Cooper P. DiStefano F. V. Feilitzsch T. Frank J. Jochum R. Keeling H. Kraus M. Loidl J. Marchese O. Meier P. Meunier U. Nagel D. Pergolesi F. Pröbst Y. Ramachers J. Schnagl I. Sergeyev M. Sisti L. Stodolsky S. Uchaikin L. Zerle 《Physics of Atomic Nuclei》2000,63(7):1242-1248
We discuss the short-and long-term perspectives of the CRESST (Cryogenic Rare Event Search using Superconducting Thermometers) project and present the current status of the experiment and new results concerning detector development. In the search for elementary particle dark matter, CRESST is presently the most advanced deep underground, low-background, cryogenic facility. The basic technique involved is to search for WIMPs (Weakly Interacting Massive Particles) by the measurement of nonthermal phonons, as created by WIMP-induced nuclear recoils. Combined with our newly developed method for the simultaneous measurement of scintillation light, strong background discrimination is possible, resulting in a substantial increase in WIMP detection sensitivity. This will allow a test of the reported positive evidence for a WIMP signal by the DAMA Collaboration in the near future. In the long term, the present CRESST setup permits the installation of a detector mass up to 100 kg. In contrast to other projects, CRESST technology allows the employment of a large variety of detection materials. This offers a powerful tool in establishing a WIMP signal and in investigating WIMP properties in the event of a positive signal. 相似文献