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Evolution of collectivity is Xe-118

机译:集体的演变是XE-118

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摘要

A recoil-distance Doppler shift experiment has been performed using the Pd-102(F-19, p2n) reaction at a beam energy of 73 MeV to measure the lifetime of excited states in Xe-118. The differential decay-curve method using gamma gamma coincidences and a gating procedure that allows to extract the lifetime without feeding assumptions has been employed. The lifetimes obtained for the yrast states up to spin-parity 8(+) are compared with interacting boson model calculations and Xe-118 can be classified as a transitional nucleus between the spherical and a deformed shape. Systematics of the B(E2) values for the 2(+) -> 0(+) and 4(+) -> 2(+) transitions in the isotopic chains of tin, tellurium and xenon are presented. It is proposed that a "critical point" exists at which the B(E2; 4(+) -> 2(+))/B(E2; 2(+) -> 0(+)) ratio drops to unity for lower neutron numbers within the isotopic chain. The position of the "critical point" varies with proton number, i.e., it is presumed to be located at the same mass number A = 114 in the Sn, Te, and Xe isotopes.
机译:利用Pd-102(F-19,p2n)反应在73MeV束流能量下进行了反冲距离多普勒频移实验,以测量Xe-118中激发态的寿命。采用了使用伽马-伽马重合和门控程序的微分衰减曲线法,该门控程序允许在没有馈电假设的情况下提取寿命。通过与相互作用玻色子模型计算结果的比较,得到了自旋宇称为8(+)的yrast态的寿命,Xe-118可以归类为球形和变形形状之间的过渡核。给出了锡、碲和氙同位素链中2(+)->0(+)和4(+)->2(+)跃迁的B(E2)值的系统分类。建议存在一个“临界点”,在该点上,同位素链中较低的中子数的B(E2;4(+)->2(+))/B(E2;2(+)->0(+))比值下降到一。“临界点”的位置随质子数的变化而变化,即在Sn、Te和Xe同位素中,它被假定位于相同的质量数A=114处。

著录项

  • 来源
    《Physical review, C》 |2020年第6期|共9页
  • 作者单位

    Argonne Natl Lab Div Phys 9700 South Cass Ave Lemont IL 60439 USA;

    Univ Cologne Inst Kernphys Zulpicher Str 77 D-50937 Cologne Germany;

    Univ Cologne Inst Kernphys Zulpicher Str 77 D-50937 Cologne Germany;

    Univ Cologne Inst Kernphys Zulpicher Str 77 D-50937 Cologne Germany;

    Univ Cologne Inst Kernphys Zulpicher Str 77 D-50937 Cologne Germany;

    Univ Cologne Inst Kernphys Zulpicher Str 77 D-50937 Cologne Germany;

    Univ Cologne Inst Kernphys Zulpicher Str 77 D-50937 Cologne Germany;

    Univ Cologne Inst Kernphys Zulpicher Str 77 D-50937 Cologne Germany;

    Univ Cologne Inst Kernphys Zulpicher Str 77 D-50937 Cologne Germany;

    Argonne Natl Lab Div Phys 9700 South Cass Ave Lemont IL 60439 USA;

    Univ Cologne Inst Kernphys Zulpicher Str 77 D-50937 Cologne Germany;

    Univ Cologne Inst Kernphys Zulpicher Str 77 D-50937 Cologne Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
  • 关键词

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