High-spin isomers in p>212p>Rn in the region of triple neutron core-excitations

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• 作者：G.D. Dracoulis ; G.J. Lane ; A.P. Byrne ; P.M. Davidson ; T. Kib&#xe9 ; di ; P. Nieminen ; H. Watanabe ; A.N. Wilson
• 关键词：High-spin isomers ; p>212p>Rn ; Multi-particle states ; Empirical shell-model
• 刊名：Physics Letters B
• 出版年：2008
• 期刊代码：58_03702693
• 类别：ph
• 出版时间：10 April 2008
• 卷：662
• 期：1
• 页码：19-25
• 文件大小：254 K

摘要

The level scheme of p>212p>Rn has been extended to spins of p://www.sciencedirect.com/scidirimg/entities/223c.gif" alt="not, vert, similar" title="not, vert, similar" border="0">38p://www.sciencedirect.com/scidirimg/entities/210f.gif" alt="planck constant over two pi" title="planck constant over two pi" border="0"> and excitation energies of about 13 MeV using the p>204p>Hg(p>13p>C, 5n)p>212p>Rn reaction and γ-ray spectroscopy. Time correlated techniques have been used to obtain sensitivity to weak transitions and channel selectivity. The excitation energy of the 22p>+p> core-excited isomer has been established at 6174 keV. Two isomers with τ=25(2) ns and τ=12(2) ns are identified at 12211 and 12548 keV, respectively. These are the highest-spin nuclear isomers now known, and are attributed to configurations involving triple neutron core-excitations coupled to the aligned valence protons. Semi-empirical shell-model calculations can account for most states observed, but with significant energy discrepancies for some configurations.