Abstract
Review of the experimental results on the search for and the spectroscopy of the superheavy hydrogen isotopes 4–7H obtained in stopped π−-meson absorption by 9Be and 11Be nuclei is presented. Study of light neutron-rich nuclei is a principal line in developing modern views on the properties of nuclear forces and determination of nuclear properties near the drip line. The present method of investigation relies on precision measurements of energy of charged particles emitted after pion absorption by nuclei. Important advantages of this method are the practically accurate initial state energy and momentum, as well as the possibility to study a wide range of excitation energy. In the frames of this method new results were obtained on level structures of the isotopes 4–6H and indications on 7H production. Comparison with other experimental and theoretical results is performed.
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