Improved spin-dependent limits from the PICASSO dark matter search experiment

Barnabé‐Heider, M.; Marco, M. Di; Doane, P.; Genest, M. H.; Gornea, R.; Guénette, R.; Leroy, C.; Lessard, L.; Martín, J. P.; Wichoski, U.; Zacek, V.; Clark, K.; Krauss, C. B.; Noble, A. J.; Behnke, E.; Feighery, William G.; Levine, I.; Muthusi, C.; Kanagalingam, S.; Noulty, R.

doi:10.1016/j.physletb.2005.08.021

Cited by 88 publications

(80 citation statements)

References 21 publications

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“…The dashed curves show the combined Xe limits using the alternate form factor. Also shown are the results from the CDMS experiment [20] (diamonds), ZEPLIN-II [21] (circles), KIMS [22] (triangles), NAIAD [23] (squares), PICASSO [24] (stars), COUPP [25] (pluses), SuperK [31] (crosses), as well as the DAMA evidence region under the assumption of standard WIMP nuclear recoils and dark halo parameters (green filled region) [18]. The theoretical regions (blue filled) for the neutralino (in the constrained minimal supersymmetric model) are taken from [32].…”

Section: Fig 1: Xenon10 Combined 90% CL Exclusion Limits Formentioning

confidence: 99%

“…detection experiments such NAIAD [23], PICASSO [24], KIMS [22] and COUPP [25], all containing nuclei with unpaired protons. We also show the DAMA evidence region for standard WIMP interactions and halo parameters [18], as well as predictions of neutralino-nucleon cross sections in the constrained minimal super-symmetric model (CMSSM) [32].…”

Section: Fig 1: Xenon10 Combined 90% CL Exclusion Limits Formentioning

confidence: 99%

“…In Fig.1 we show the combined upper limit curves in the WIMP-nucleon cross section versus WIMP mass plane, for the simple case of pure neutron (left) and pure proton (right) couplings for the 129 Xe and 131 Xe isotopes. We also include limits from CDMS [20], ZEPLIN-II [21], KIMS [22], NAIAD [23], PICASSO [24], COUPP [25] as well as the indirect detection limits from Super-Kamiokande [31] for the case of pure proton couplings. Given that 129 Xe and 131 Xe both contain an unpaired neutron, XENON10 is mostly sensitive to WIMPneutron spin-dependent couplings and excludes previously unexplored regions of parameter space.…”

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confidence: 99%

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Limits on Spin-Dependent WIMP-Nucleon Cross Sections from the XENON10 Experiment

Angle¹,

Aprile²,

Arneodo³

et al. 2008

Phys. Rev. Lett.

188

160

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XENON10 is an experiment to directly detect weakly interacting massive particle (WIMPs), which may comprise the bulk of the non-baryonic dark matter in our Universe. We report new results for spin-dependent WIMP-nucleon interactions with 129 Xe and 131 Xe from 58.6 live-days of operation at the Laboratori Nazionali del Gran Sasso (LNGS). Based on the non-observation 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 ∼10 GeV/c 2 -2 TeV/c 2 as a dark matter candidate under standard assumptions for its density and distribution in the galactic halo.PACS numbers: 95.35.+d, 29.40.Mc, 95.55.Vj Evidence for a significant cold dark matter component in our universe is stronger than ever [1, 2, 3], a wellmotivated particle candidate being the lightest neutralino from super-symmetric extensions to the Standard Model [4]. Such a particle is neutral, non-relativistic, stable, and more generally classified as a Weakly Interacting Massive Particle (WIMP). The open question of the nature of WIMPs is being addressed by numerous direct and indirect detection experiments [5,6,7].Among these, the XENON10 experiment aims to directly detect galactic WIMPs scattering elastically from Xe atoms. Moving with velocities around 10 −3 c, WIMPs can couple to nucleons via both spin-independent and spin-dependent (axial vector) interactions. Spinindependent WIMP-nucleon couplings are in general smaller than axial vector couplings [4]. However, for low momentum transfer, they benefit from coherence across the nucleus, and therefore the overall event rate for WIMP interactions is expected to be dominated by the spin-independent coupling for target nuclei with A≥30. The sensitivity of XENON10 to spin-independent interactions is published in [8].We report here on a spin-dependent analysis of 58.6 live-days of WIMP-search data, taken in low-background conditions at LNGS, which provides ∼3100 meters water equivalent rock overburden. XENON10 is a dual phase (liquid and gas) xenon time projection chamber, discriminating between the predominantly electron-recoil background and the expected nuclear-recoil WIMP signal via the distinct ratio of ionization to scintillation for each type of interaction [8]. A nuclear recoil energy threshold of 4.5 keV was achieved, and 10 candidate events were recorded for an exposure of about 136 kg days after analysis cuts (the fiducial mass was 5.4 kg). Although all observed events are consistent with expected background from electron recoils (see [8] for details on the analysis and the candidate events), no background subtraction is employed for calculating the WIMP upper limits. In the following analysis, we use identical data quality, fiducial volume, and physics cuts as reported in [8].For axial WIMP-nuclei interactions, the WIMPs couple to the spins of the nucleons. Although the interaction with the nucleus is coherent (as it is in the s...

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Section: Fig 1: Xenon10 Combined 90% CL Exclusion Limits Formentioning

confidence: 99%

Section: Fig 1: Xenon10 Combined 90% CL Exclusion Limits Formentioning

confidence: 99%

mentioning

confidence: 99%

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Limits on Spin-Dependent WIMP-Nucleon Cross Sections from the XENON10 Experiment

Angle¹,

Aprile²,

Arneodo³

et al. 2008

Phys. Rev. Lett.

188

160

View full text Add to dashboard Cite

show abstract

“…Some of them, such as DAMA [2], CDMSSi [3], CoGeNT [4], and CRESST-II [5] have claimed positive results while others including CDMS-Ge, Xenon100, LUX [6][7][8], and SuperCDMS [9] have ruled out those claims. Many experiments have set an upper limit on the mass cross-section contour of WIMPs interacting with normal matters [6][7][8][9][10][11][12][13][14][15]. The next generation ton-scale experiments aim to achieve a sensitivity of ∼10 −48 cm 2 to WIMP-Nucleon cross-section for WIMP mass of ∼100 GeV.…”

Section: Introductionmentioning

confidence: 99%

Measuring muon-induced neutrons with liquid scintillation detector at Soudan mine

Zhang

Mei

2014

Phys. Rev. D

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We report a direct detection of muon-induced high energy neutrons with a 12-liter neutron detector fabricated with EJ-301 liquid scintillator operating at Soudan Mine for about two years. The detector response to energy from a few MeV up to ∼ 20 MeV has been calibrated using radioactive sources and cosmic-ray muons. Subsequently, we have calculated the scintillation efficiency for nuclear recoils, up to a few hundred MeV, using Birks' law in the Monte Carlo simulation. Data from an exposure of 655.1 days were analyzed and neutron-induced recoil events were observed in the energy region from 4 MeV to 50 MeV, corresponding to fast neutrons with kinetic energy up to a few hundred MeV, depending on the scattering angle. Combining with the Monte Carlo simulation, the measured muon-induced fast neutron flux is determined to be (2.23 ± 0.52(sta.) ± 0.99(sys.)) × 10 −9 cm −2 s −1 (En > 20 MeV), in a reasonable agreement with the model prediction. The muon flux is found to be (1.65 ± 0.02(sta.) ± 0.1(sys.)) × 10 −7 cm −2 s −1 (Eµ > 1 GeV), consistent with other measurements. As a result, the muon-induced high energy gamma-ray flux is simulated to be 7.08 ×10 −7 cm −2 s −1 (Eγ > 1 MeV) for the depth of Soudan.

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“…3 and 4 in the cases of pure proton coupling and pure neutron coupling, respectively. We also show the results obtained from CDMS [19], NAIAD [20], SIMPLE [21], and PICASSO [22]. The DAMA signal region is taken from Ref [23].…”

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confidence: 99%

Limits on Interactions between Weakly Interacting Massive Particles and Nucleons Obtained with CsI(Tl) Crystal Detectors

Lee¹,

Kwak²,

Lee³

et al. 2007

Phys. Rev. Lett.

178

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The Korea Invisible Mass Search (KIMS) experiment presents new limits on the WIMP-nucleon cross section using data from an exposure of 3409 kg·d taken with low-background CsI(Tl) crystals at Yangyang Underground Laboratory. The most stringent limit on the spin-dependent interaction for a pure proton case is obtained. The DAMA signal region for both spin-independent and spindependent interactions for the WIMP masses greater than 20 GeV/c 2 is excluded by the single experiment with crystal scintillators. I are sensitive to the spin-independent (SI) and spin-dependent (SD) interactions of WIMPs. Recently, the role of CsI in the direct search for SD WIMP for pure proton coupling has been pointed out [8]. It is worth noting that 127 I is the dominant target for the SI interactions in the DAMA experiment. The pulse shape discrimination (PSD) technique allows us to statistically separate nuclear recoil (NR) signals of WIMP interactions from the electron recoil (ER) signals due to the gamma ray background [9][10].The KIMS experiment is located at the Yangyang Undeground Laboratory (Y2L) at a depth of 700 m under an earth overburden. Details of the KIMS experiment and the first limit with 237 kg·d exposure data can be found in the previous publication [11]. Four low-background CsI(Tl) crystals are installed in the Y2L and operated at a temperature of T = 0• C. Throughout the exposure period, the temperature of the detector was kept stable to within ±0

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Improved spin-dependent limits from the PICASSO dark matter search experiment

Cited by 88 publications

References 21 publications

Limits on Spin-Dependent WIMP-Nucleon Cross Sections from the XENON10 Experiment

Limits on Spin-Dependent WIMP-Nucleon Cross Sections from the XENON10 Experiment

Measuring muon-induced neutrons with liquid scintillation detector at Soudan mine

Limits on Interactions between Weakly Interacting Massive Particles and Nucleons Obtained with CsI(Tl) Crystal Detectors

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