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arXiv 0809.1831astro-ph
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在与WIMP暗物质搜寻有关的能量处头-尾定向核反冲特征的首次测量

First measurement of the Head-Tail directional nuclear recoil signature at energies relevant to WIMP dark matter searches

S. Burgos, E. Daw, J. Forbes, C. Ghag, M. Gold, C. Hagemann, V. A. Kudryavtsev, T. B. Lawson, D. Loomba, P. Majewski, D. Muna, A. StJ. Murphy, G. G. Nicklin, S.… 展开作者

S. Burgos, E. Daw, J. Forbes, C. Ghag, M. Gold, C. Hagemann, V. A. Kudryavtsev, T. B. Lawson, D. Loomba, P. Majewski, D. Muna, A. StJ. Murphy, G. G. Nicklin, S. M. Paling, A. Petkov, S. J. S. Plank, M. Robinson, N. Sanghi, D. P. Snowden-Ifft, N. J. C. Spooner, J. Turk, E. Tziaferi

摘要:

我们使用1 m^3 DRIFT-IIc暗物质探测器首次提供了中子诱导核反冲轨道在能量低至1.5 keV/amu时的所谓头尾不对称特征的证据。这种机制适用于由弱相互作用大质量粒子(WIMPs)引起的反冲,但对差分电离的理解却很少。我们表明,反冲能量和方向的分布引起的Cf-252中子匹配以及预期从大质量WIMP。这些结果为寻找WIMP的星系特征提供了一种强有力的新方法。

英文摘要:

We present first evidence for the so-called Head-Tail asymmetry signature of neutron-induced nuclear recoil tracks at energies down to 1.5 keV/amu using the 1m^3 DRIFT-IIc dark matter detector. This regime is appropriate for recoils induced by Weakly Interacting Massive Particle (WIMPs) but one where the differential ionization is poorly understood. We show that the distribution of recoil energies and directions induced here by Cf-252 neutrons matches well that expected from massive WIMPs. The results open a powerful new means of searching for a galactic signature from WIMPs.

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