Analog of the giant dipole resonance in {sup 4}He

We studied the giant dipole resonance (GDR) in {sup 4}He by observing its analog via the {sup 4}He({sup 7}Li,{sup 7}Be) reaction at an incident energy of 455 MeV and at forward scattering angles. The spin-nonflip ({delta}S=0) spectrum was deduced by measuring the 0.43-MeV {sup 7}Be {gamma}-ray in coincidence with the scattered {sup 7}Be. The total cross section of photodisintegration to the GDR in {sup 4}He was derived from the {delta}S=0 and {delta}L=1 spectrum. The result agrees well with the previous total photodisintegration data in which the GDR has a pronounced peak at E{sub {gamma}}{approx}27 MeV.