Does the average distance that a neutron travels through fissionable material before escaping increase or decrease when

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Does the average distance that a neutron travels through fissionable material before escaping increase or decrease when two pieces of fissionable material are assembled into one piece? Does this assembly increase or decrease the probability of an explosion?
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Conceptual Physics

ISBN: 978-0321568090

11th edition

Authors: Paul G. Hewitt

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