In free space, this particle has a mean life of approximately 887 seconds and decays by the standard mechanism of transformation of one of its two down quarks to an up quark. The "prompt" spectrum of 
In free space, this particle has a mean life of approximately 887 seconds and decays by the standard mechanism of transformation of one of its two down quarks to an up quark. The "prompt" spectrum of these particles goes as the hyperbolic sine of their kinetic energy even in the presence of electromagnetic fields, and the interaction probability for many nuclei with this particle is inversely proportional to its speed relative to them, so they are called 1/v absorbers. For ten points, name the particle first identified in 1932 by Chadwick; a neutral nucleon.
In free space, this particle has a mean life of approximately 887 seconds and decays by the standard mechanism of transformation of one of its two down quarks to an up quark.
{neutron} (or {n})