Detection of Dark Matters by Nuclear Emulsions with Knowledge and Methods of Photographic Science

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  • TANI Tadaaki
    Fellow, The Society of Photography and Imaging of Japan
  • NAKA Tatsuhiro
    Institute for Origin of Particles and Universe, Center for Experimental Studies/Institute for Advanced Research, Nagoya University

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  • 原子核乳剤による暗黒物質の検出─写真科学の知見と手法の適用─
  • 原子核乳剤による暗黒物質の検出 : 写真科学の知見と手法の適用
  • ゲンシカク ニュウザイ ニ ヨル アンコク ブッシツ ノ ケンシュツ : シャシン カガク ノ チケン ト シュホウ ノ テキヨウ

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Abstract

<p>In the light of the mechanism of highly efficient latent image formation by light, an analysis has been made on the mechanism of the latent image formation by dark matters in nuclear emulsions with 40 nm AgX grains. It has been estimated that dark matters form recoil atoms and finally create 〜1000 electron-hole pairs in each AgX grain for 〜10 fs, while neutrinos create only 〜6 electron-hole pairs in each grain after forming minimum ionizing particles. The analysis has indicated that the highly efficient latent image formation process should not take place and even is not required for dark matter detection owing to the following reasons. The concentration of electron-hole pairs is too high for Coulomb force to work, for sensitization centers to treat created electrons and positive holes, and for ionic processes to depress the recombination between electrons and positive holes. Instead of chemical sensitizations for efficient latent image formation by light, effective hole-trapping and halogen-accepting technologies should be indispensable to dark matter detection．</p>

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