Phenomenology of $n$-${\bar n}$ Oscillations Revisited
  We revisit the phenomenology of $n$-${\bar n}$ oscillations in the presence of external magnetic fields, highlighting the role of spin. We show, contrary to long-held belief, that the $n$-${\bar n}$ transition rate need not be suppressed, opening new opportunities for its empirical study. 
S. Gardner and E. Jafari
hep-ph nucl-ex nucl-th