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James A. Van Allen journal, December 1954-October 1955
Page 109
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Called Stewart at Harshaw. He hopes to get the crystals to us within a week. Foil will be in intimate contact with crystal face ! Might be slightly thicker to assure this? Specifications 0.001 inch thick Aluminum foil 0.6 inch Diameter = 1.524 cm 0.0625 inch thick = 0.159 cm = (0.159)(3.667) = 0.58 g / (cm squared) Flat Face Area = 1.82 (cm squared) A. Hudson and R. Hofstadter : "Energy Loss of Cosmic Ray Mu-Mesons in Sodium Iodide Crystals" Phys. Rev. 88, pages 589-596 (1952) Value of minimum energy loss (most probable) for µ mesons occurs at p ~ 0.5 x (10 exponent 9) [M?][ev?]/c. and is 26 Mev for a crystal 2.17 inch in thickness
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Called Stewart at Harshaw. He hopes to get the crystals to us within a week. Foil will be in intimate contact with crystal face ! Might be slightly thicker to assure this? Specifications 0.001 inch thick Aluminum foil 0.6 inch Diameter = 1.524 cm 0.0625 inch thick = 0.159 cm = (0.159)(3.667) = 0.58 g / (cm squared) Flat Face Area = 1.82 (cm squared) A. Hudson and R. Hofstadter : "Energy Loss of Cosmic Ray Mu-Mesons in Sodium Iodide Crystals" Phys. Rev. 88, pages 589-596 (1952) Value of minimum energy loss (most probable) for µ mesons occurs at p ~ 0.5 x (10 exponent 9) [M?][ev?]/c. and is 26 Mev for a crystal 2.17 inch in thickness
Van Allen Papers
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