论文标题
$^{36} $ ca在库仑放大玻璃下的结构
The structure of $^{36}$Ca under the Coulomb magnifying glass
论文作者
论文摘要
Detailed spectroscopy of the neutron-deficient nucleus $^{36}$Ca was obtained up to 9 MeV using the $^{37}$Ca($p$,$d$)$^{36}$Ca and the $^{38}$Ca($p$,$t$)$^{36}$Ca transfer reactions.由LISE光谱仪在Ganil处产生的放射性核与液体氢靶加密的质子相互作用，以产生在MUST2检测器阵列中检测到的光弹出物（Deuteron $ d $或Triton $ t $），并与重量残基同时确定了由零度检测系统确定的重量残基。百分比已测量了9 MEV。我们的主要发现是：i）1 $^+_ 1 $和2 $^+_ 1 $状态的能量转变约为-250 kev，与镜像核$^{36} $ s，ii）发现了入侵者0 $^+_ 2 $ _ 2 $ state in 2.83（13）mev $ y $^$^$^$^$^$^$^$^$^$^$和iii）暂定0 $^+_ 3 $状态为4.83（17）MEV，建议在2s $ _ {1/2} $ orbit中展示带有两个中子空位的气泡结构。 0 $^+_ 2 $和2 $^+_ 1 $状态之间的反转是由于前者的大镜能差（MED）为-516（130）KeV。此功能由Shell Model（SM）计算复制，使用$ SD $ - $ PF $ Valence空间，预测0 $^+_ 2 $状态的几乎纯粹的入侵性质，其中两个质子（中子）在$^{36} $ CA（$^{$^{36} $ s）中激发了两个质子（中子）。如果排除连续体效应引起的少数病例，则该镜像系统具有有史以来观察到的最大药物。
Detailed spectroscopy of the neutron-deficient nucleus $^{36}$Ca was obtained up to 9 MeV using the $^{37}$Ca($p$,$d$)$^{36}$Ca and the $^{38}$Ca($p$,$t$)$^{36}$Ca transfer reactions. The radioactive nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid Hydrogen target CRYPTA, to produce light ejectiles (the deuteron $d$ or triton $t$) that were detected in the MUST2 detector array, in coincidence with the heavy residues %identified by a zero degree detection system. %States have been measured up to 9 MeV. Our main findings are: i) a similar shift in energy for the 1$^+_1$ and 2$^+_1$ states by about -250 keV, as compared to the mirror nucleus $^{36}$S, ii) the discovery of an intruder 0$^+_2$ state at 2.83(13) MeV, which appears below the first 2$^+$ state, in contradiction with the situation in $^{36}$S, and iii) a tentative 0$^+_3$ state at 4.83(17) MeV, proposed to exhibit a bubble structure with two neutron vacancies in the 2s$_{1/2}$ orbit. The inversion between the 0$^+_2$ and 2$^+_1$ states is due to the large mirror energy difference (MED) of -516(130) keV for the former. This feature is reproduced by Shell Model (SM) calculations, using the $sd$-$pf$ valence space, predicting an almost pure intruder nature for the 0$^+_2$ state, with two protons (neutrons) being excited across the $Z$=20 magic closure in $^{36}$Ca ($^{36}$S). This mirror system has the largest MEDs ever observed, if one excludes the few cases induced by the effect of the continuum.
