Spectroscopy of the ⁵H superheavy hydrogen isotope

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• 作者：M. G. Gornov (1)
  M. N. Ber (1)
  Yu. B. Gurov (1) Gurov@axpk40.mephi.ru
  S. V. Lapushkin (1)
  P. V. Morokhov (1)
  V. A. Pechkurov (1)
  N. O. Poroshin (1)
  V. G. Sandukovsky (2)
  M. V. Tel鈥檏ushev (1)
  B. A. Chernyshev (1)
• 关键词：PACS numbers 21.10.− ; k ; 25.80.Hp
• 刊名：JETP Letters
• 出版时间：April 2003
• 出版年：2003
• 期刊代码：20_00213640
• 类别：ph
• 卷：77
• 期：7
• 页码：344-348
• 数据来源：sp

摘要

The formation of the 5H superheavy hydrogen isotope was experimentally sought in the reactions induced by stopped π− mesons absorbed by 9Be nuclei. Peaks in missing-mass spectra were observed in two reaction channels, 9Be(π−, pt)X and 9Be(π−, dd)X, and were attributed to the 5H resonance states. The lowest state has parameters Er=5.5卤0.2 MeV and Г=5.4卤0.5 MeV [E _r is the resonance energy measured from the (triton + two neutrons) threshold]. Therefore, 5H is bound more weakly than 4H. Excited states of 5H were also observed. All three resonance levels (E _1r=10.6卤0.3 MeV, Г_1r=6.8卤0.5 MeV; E _2r=18.5卤0.4 MeV, Г_2r=4.8卤1.3 MeV; E _3r=26.7卤0.4 MeV, Г_3r=3.6卤1.3 MeV) can decay into five free nucleons.