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首页> 外文期刊>Physical Review C >Neutron effective single-particle energies above ~(78)Ni: A hint from lifetime measurements in the N = 51 isotones ~ (85)Se and ~(87)Kr
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Neutron effective single-particle energies above ~(78)Ni: A hint from lifetime measurements in the N = 51 isotones ~ (85)Se and ~(87)Kr

机译：中子有效的单粒子能量高于〜（78）Ni：n = 51同种子中的寿命测量的提示〜（85）Se和〜（87）Kr

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Background: While the N = 50 shell-gap evolution towards ~(78)Ni is presently in the focus of nuclear structure research, experimental information on the neutron effective single-particle energy sequence above the 78Ni core remain scarce. Direct nucleon-exchange reactions are indeed difficult with presently available post-accelerated radioactive-ion beams (especially for high orbital-momentum orbitals) in this exotic region. Purpose: In this study we probe the evolution of the ν1g7/2 effective single-particle energy which is a key to understanding the possible evolution of the spin-orbit splitting due to the proton- neutron interaction in the ~(78)Ni region. To achieve this goal, a method based on lifetime measurements is used for the first time. The obtained lifetimes of the 7/2~+_1 states in ~(87)Kr and ~(85)Se are used to investigate the ν1g_(7/2) evolution. Method: Yrast and near-yrast states in the light N = 51 isotones 85Se and ~(87)Kr were populated via multinucleon transfer reactions, using a ~(82)Se beam and a 238U target at the LNL tandem-ALPI facility. The prompt γ rays were detected by the AGATA Demonstrator and particle identification was performed using the PRISMA spectrometer. Lifetime measurements were performed by using the Cologne plunger device for deep inelastic reactions and the Recoil Distance Doppler Shift technique. Results: We obtain τ(7/2~+_1 )= 0.4~(+1.6)_(−0.4) ps for ~(87)Kr. In the case of 85Se an upper limit of 3(2) ps is obtained for the τ_(7/2~+_1) value. Conclusion: For ~(87)Kr, the measured (7/2~+_1 ) lifetime is consistent with a core- coupled 2~+ ⊕ ν2d_(5/2) configuration for this state. This result is consistent with that obtained by direct reaction, which validates our method. For ~(85)Se, the measured 7/2~+_1 lifetime limit indicates a very small contribution of the ν1g7/2 configuration to the wave function of this state.
机译：背景：虽然n = 50次壳间隙进化〜（78）NI目前在核结构研究的重点中，但在78NI核心上方的中子有效单粒子能量序列的实验信息仍然稀缺。直接核仁交换反应确实困难，目前可用的加速后的放射性离子束（特别是对于该异乎寻常的区域中的高眶动位轨道）。目的：在这项研究中，我们探讨了ν1G7/ 2的生效单粒子能量的演变，这是理解由于〜（78）Ni区域的质子中子相互作用导致的旋转轨道分裂的可能演变的关键。为了实现这一目标，首次使用基于寿命测量的方法。在〜（87）Kr和〜（85）kr和〜（85）e Se中获得的7/2〜+ _1态的寿命用于研究χ1g_（7/2）的演化。方法：使用〜（82）SE梁和LNL Tandem-Alpi设施的〜238U靶填充Yrast和近yrast 85se 85se和〜（87）Kr。通过agata演示器检测到提示γ射线，并使用prisma光谱仪进行粒子识别。通过使用用于深非弹性反应和反冲距离多普勒换档技术的古龙车柱塞装置进行寿命测量。结果：我们获得τ（7/2〜_1）= 0.4〜（+1.6）_（ - 0.4）PS，用于〜（87）KR。在85SE的情况下，为τ_（7/2〜+ _1）值获得3（2）ps的上限。结论：对于〜（87）KR，测量的（7/2〜_1）寿命与这种状态的核心耦合2〜+⊕⊕2d_（5/2）配置一致。该结果与直接反应获得的结果一致，验证我们的方法。对于〜（85）SE，测量的7/2〜+ _1寿命限制表示ν1G7/ 2配置对该状态的波函数的贡献非常小。

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  • 来源
    《Physical Review C》 |2017年第2017期|044320.1-044320.12|共12页
  • 作者

    F. Didierjean; D. Verney; G. Duchene; J. Litzinger; K. Sieja; et al;

  • 作者单位

    Universite de Strasbourg CNRS IPHC UMR 7178 F-67000 Strasbourg France;

    Institut de Physique Nucleaire CNRS/IN2P3 Univ. Paris Sud Universite Paris Saclay F-91406 Orsay France;

    Universite de Strasbourg CNRS IPHC UMR 7178 F-67000 Strasbourg France;

    Institut fuer Kernphysik Universitaet zu Koeln D- 50937 Koeln Germany;

    Universite de Strasbourg CNRS IPHC UMR 7178 F-67000 Strasbourg France;

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