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