Decay neutrons from the Ca-40(e,e'n)Ca-39 reaction were studied in the
giant resonance region. The cross sections and angular distributions,
separated for n0 and n1 decays, were obtained for excitation energies
between 19 and 27 MeV, at the effective momentum transfer of 0.35 fm-
1. Legendre polynomial coefficients obtained from fitting the data are
compared with those from the (e,e'p) reaction. In the energy range 19
-21 MeV, the interference coefficients b1 and b3 for the ground state
transition are in agreement, but the noninterference coefficient b2 is
different. The different behavior of the angular distribution for pro
tons and neutrons may suggest the interference of the decay from a T =
0 quadrupole resonance and the T = 1 giant dipole resonance. A simila
r tendency was also seen in comparing with the (e, e'p1) reaction. The
Legendre polynomial coefficients for the no decay in the (e,e'n) reac
tion, transformed to the photon point, agree well with those of the (g
amma,n0) reaction. The reduced total cross section is-consistent betwe
en the (e,e'n) and (gamma,n) reactions, but the cross section for (e,e
'n0) is larger than that of (gamma,n0) near the peak of the resonance.
The values of the longitudinal-transverse interference term are close
to zero in the present region, which is rather small compared with th
e value near the resonance of the (e,e'p) reaction.