Design and simulation of windowless gas jet target for experimental nuclear physics

Recent measurement for the gamma transition between the 4 and 2 states of Be in the He+He reaction using a gas cell target addressed the first electromagnetic signature of its dumbbell-like shape [1]. In the gas cell target the chamber is isolated from the beam line vacuum using Kapton foils at the entry and the exit, which is the main source of background for the gamma ray measurement. There is a need to develop the windowless gas jet target for the measurement of radiative capture cross section. The development of windowless gas jet target is also useful for nuclear physics experiments for the measurement of cross sections of astrophysical interest, production mono-energetic neutron by inverse kinematics using gaseous targets.