Arguments for a "U.S. Kamioka": SNOLab and its Implications for North American Underground Science Planning

Details Arguments for a "U.S. Kamioka": SNOLab and its Implications for North American Underground Science Planning Arguments for a "U.S. Kamioka": SNOLab and its Implications for North American Underground Science Planning

2006-04-10

arxiv.org/abs/nucl-ex/0604004v4

Physics

Nuclear Physics

Nuclear Experiment

23 pages, 10 figures; revised version includes discusion about neutrino-factory magic baselines

Scientific paper

We argue for a cost-effective, long-term North American underground science strategy based on partnership with Canada and initial construction of a modest U.S. Stage I laboratory designed to complement SNOLab. We show, by reviewing the requirements of detectors now in the R&D phase, that SNOLab and a properly designed U.S. Stage I facility would be capable of meeting the needs of North America's next wave of underground experiments. We discuss one opportunity for creating a Stage I laboratory, the Pioneer tunnel in Washington State, a site that could be developed to provide dedicated, clean, horizontal access. This unused tunnel, part of the deepest (1040 m) tunnel system in the U.S., would allow the U.S. to establish, at low risk and low cost, a laboratory at a depth (2.12 km.w.e., or kilometers of water equivalent) quite similar to that of the Japanese laboratory Kamioka (2.04 km.w.e.). We describe studies of cosmic ray attenuation important to properly locating such a laboratory, and the tunnel improvements that would be required to produce an optimal Stage I facility. We also discuss possibilities for far-future Stage II (3.62 km.w.e.) and Stage III (5.00 km.w.e.) developments at the Pioneer tunnel, should future North American needs for deep space exceed that available at SNOLab.

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