Hydrogen-4 and Hydrogen-5 from $t+t$ and $t+d$ transfer reactions studied with a 57.5-MeV triton beam

An environmentally safe liquid/solid tritium target suitable for beams of radioactive nuclei was created and used in the study of $t+d$ and $t+t$ transfer reactions with putting emphasis on the observation of $4H$ and $5H$ resonance states. A state of $4H$ with $Eres=3.22±0.15 MeV$ and $Γobs=3.33±0.25 MeV$ was obtained in $t+d$ reaction from the spectra of protons leaving the target at $θlab=18°–32°$ and detected in coincidence with tritons. A valuable fraction of protons detected in $t+t$ reaction at $θlab=18°–32°$ in ptn coincidence events was attributed to the states of $5H$ nucleus. At ∼2.5 MeV above the tnn decay threshold the $5H$ spectrum shows up a narrow maximum followed by a wide structure at 4–7 MeV. One can not exclude that interference effects could modify the observed $5H$ resonance maximum resulting in its energy shift and width reduction.