Missing mass spectroscopy of $^{4}$H via exothermic charge exchange reaction ($^{8}$He, $^{8}$Li$\gamma$)

Charge exchange reactions are powerful tools in the study of spin-isospin responses in nuclei. The RI beam induced reactions have the variety of spin-isospin and the high $Q$-Value with internal energy. We aimed to study the nuclear structure of unbound nuetron rich 4H. This work is the first measurement of ($^{8}$He(0$^{+}$), $^{8}$Li(1$^{+}$)) reaction at the energy of 190 MeV/u. This reaction has the feature of the large mass difference of 11 MeV and tagging $\Delta$ $S$ = $\Delta$ $T$ = 1 transition mode by detecting de-excited $\gamma$-rays (980~keV) form first 1$^{+}$ state in $^{8}$Li. The experiment was performed with the SHARAQ spectrometer combined with the $\gamma$-ray detector array DALI2 in RIBF. The $^{8}$He beam produced via thr projectile fragmentation of $^{18}$O was irradiated liquid $^{4}$He target at the intensity of about 2 MHz. Excitation energy was obtained by measuring the momenta of the $^{8}$He and $^{8}$Li beams in the beamline and the SHARAQ by using missing-mass method. In this presentation, the result of the present experiment will be reported.