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![arXiv:hep-ex/0404039v1 29 Apr 2004 · a shield of liquid nitrogen [Heu 95]; the Geniusand Gemproposals [Kla 99, Zde 01] were based on this idea. Since nitrogen can be purified extremely](https://static.fdocuments.ec/doc/165x107/5eb55f696d1b1f5f5a404ee4/arxivhep-ex0404039v1-29-apr-2004-a-shield-of-liquid-nitrogen-heu-95-the-geniusand.jpg)
