In-beam γ-ray spectroscopy at the proton dripline: 40Sc

In-beam γ-ray spectroscopy at the proton dripline: 40Sc
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质子滴管处的束内 γ 射线光谱:40Sc

DOI:
10.1016/j.physletb.2020.135637
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发表时间:
2020
期刊:
影响因子:
4.4
通讯作者:
Li, J.
Li, J.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gade, A.;Weisshaar, D.;Brown, B.A.;Tostevin, J.A.;Bazin, D.;Brown, K.;Charity, R.J.;Farris, P.J.;Hill, A.M.;Li, J.

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本文报道了质子滴线核40 Sc的首次在束γ能谱测量。在60.9 MeV/核子中靶能量下的9 Be(38 Ca,40 Sc+γ)X反应选择性地在40 Sc中布居态,对于这些态,转移的质子和中子耦合到高轨道角动量。反过来,由于质子发射中的角动量选择规则以及39 Ca的核结构和能量学,40 Sc中的这些态随后表现出γ衰变分支,尽管它们远高于质子分离能。这项工作独特地补充了40 Ca和40 Ti EC/β+衰变的电荷交换反应后粒子光谱学的结果,这两种反应都显示出非常不同的选择性。与镜像核和壳模型计算相比,讨论了先前已知的892 keV第一(5-)态的粒子数和γ射线衰变以及在2744 keV观察到的新能级。在实验方面,这项工作表明,使用新一代Ge阵列,可以在几μB横截面水平上进行稀有同位素束诱导的反应的高分辨率在束γ射线光谱学。
We report on the first in-beam γ-ray spectroscopy of the proton-dripline nucleus 40 Sc using two-nucleon pickup onto an intermediate-energy rare-isotope beam of 38 Ca. The 9 Be (38 Ca, 40 Sc+γ) X reaction at 60.9 MeV/nucleon mid-target energy selectively populates states in 40 Sc for which the transferred proton and neutron couple to high orbital angular momentum. In turn, due to angular-momentum selection rules in proton emission and the nuclear structure and energetics of 39 Ca, such states in 40 Sc then exhibit γ-decay branches although they are well above the proton separation energy. This work uniquely complements results from particle spectroscopy following charge-exchange reactions on 40 Ca as well as 40 Ti EC/β+ decay which both display very different selectivities. The population and γ-ray decay of the previously known first (5−) state at 892 keV and the observation of a new level at 2744 keV are discussed in comparison to the mirror nucleus and shell-model calculations. On the experimental side, this work shows that high-resolution in-beam γ-ray spectroscopy is possible with new generation Ge arrays for reactions induced by rare-isotope beams on the level of a few μb of cross section.
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