Discovery of Heavy Isotopes of 4H and 5H

    “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=18º–32º and detected in coincidence with tritons.
    A valuable fraction of protons detected in t+t reaction at θlab=18º–32º 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”.
    From “Hydrogen-4 and Hydrogen-5 from t+t and t+d transfer reactions studied with a 57.5-MeV triton beam”. G. M. Ter-Akopian, Yu. Ts. Oganessian, A. S. Fomichev, M. S. Golovkov, A. M. Rodin, S. I. Sidorchuk, R. S. Slepnev, S. V. Stepantsov, et al.
    AIP Conf. Proc. 610, 920 (2002); http://dx.doi.org/10.1063/1.1470062 Conference date: 30 Jul-3 Aug 2001. Location: Berkeley. California (USA)