Scholarlink

<p>We report the discovery of a new atomic nucleus <sup>188</sup>At, which is the heaviest proton-emitting isotope known to date. The new activity was observed through the <sup>107</sup>Ag(<sup>84</sup>Sr, 3n)<sup>188</sup>At fusion-evaporation reaction using the focal-plane spectrometer of the gas-filled recoil separator in the Accelerator Laboratory of the University of Jyväskylä, Finland. To fully interpret the experimental data, we have expanded the non-adiabatic quasiparticle model to treat nuclei in the beyond-lead region. The description reproduced the measured decay rate and pointed towards emission from an extremely prolate-deformed state with a dominant <i>s</i><sub>1/2</sub> proton component in the wave function. The Thomas-Ehrman shift can be enhanced in low angular momentum states, but such effects have not been observed in heavy nuclei. The single-proton separation energy of <sup>188</sup>At deviates from that extrapolated from the systematics, which can be interpreted as the first evidence of this effect in heavy nuclei.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

New proton emitter 188At implies an interaction unprecedented in heavy nuclei

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年5月29日

查看全文
  • Henna Kokkonen,
  • Kalle Auranen,
  • Pooja Siwach,
  • Paramasivan Arumugam,
  • Andrew D. Briscoe,
  • Sarah Eeckhaudt,
  • Lidia S. Ferreira,
  • Tuomas Grahn,
  • Paul T. Greenlees,
  • Pete Jones,
  • Rauno Julin,
  • Sakari Juutinen,
  • Matti Leino,
  • Ari-Pekka Leppänen,
  • Enrico Maglione,
  • Markus Nyman,
  • Robert D. Page,
  • Janne Pakarinen,
  • Panu Rahkila,
  • Jan Sarén,
  • Catherine Scholey,
  • Juha Sorri,
  • Juha Uusitalo,
  • Martin Venhart

摘要

We report the discovery of a new atomic nucleus 188At, which is the heaviest proton-emitting isotope known to date. The new activity was observed through the 107Ag(84Sr, 3n)188At fusion-evaporation reaction using the focal-plane spectrometer of the gas-filled recoil separator in the Accelerator Laboratory of the University of Jyväskylä, Finland. To fully interpret the experimental data, we have expanded the non-adiabatic quasiparticle model to treat nuclei in the beyond-lead region. The description reproduced the measured decay rate and pointed towards emission from an extremely prolate-deformed state with a dominant s1/2 proton component in the wave function. The Thomas-Ehrman shift can be enhanced in low angular momentum states, but such effects have not been observed in heavy nuclei. The single-proton separation energy of 188At deviates from that extrapolated from the systematics, which can be interpreted as the first evidence of this effect in heavy nuclei.