Search for superheavy hydrogen isotopes in pion absorption reactions

摘要

Review of the experimental results on the search for and the spectroscopy of the superheavy hydrogen isotopes H4-7 obtained in stopped pi(-)-meson absorption by Be-9 and Be-11 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 H4-6 and indications on H-7 production. Comparison with other experimental and theoretical results is performed.