A windowless He-gas target for astrophysics experiments
POSTER
Abstract
In He-burning in stars $^{4}$He($^{12}$C,$^{16}$O)$\gamma $ reaction plays an important role, however, the reaction cross section at stellar energy has not been measured yet. This experiment is very difficult. To measure the $^{4}$He($^{12}$C,$^{16}$O)$\gamma $ cross section, a thick (24Torr x 3cm) windowless $^{4}$He gas target has been developed at Kyushu University. Structure of the windowless gas target and measurement of the target thickness using a proton beam will be reported.