论文标题
$^{36} $ ca的第一个笔记陷阱质量测量
First Penning trap mass measurement of $^{36}$Ca
论文作者
论文摘要
同型五重五线集提供了同质多重质量方程(IMME)的最佳测试,并且可以独特地识别出核汉密尔顿核中均质对称性破坏作用的高阶校正。广义Imme(Gimme)是一种新型的微观相互作用理论,可以预测Imme的二次形式的扩展。只有$ a = 20,32 $ $ t = 2 $五重奏具有异国情调的$ t_z = -2 $成员基质量质量,通过penning陷阱质谱法确定为高精度。在这项工作中,我们将$ a = 36 $建立为第三个高精度$ t = 2 $ iSobaric五重奏组,其中$ t_z = -2 $成员基质量质量是通过PENNING陷阱质谱测量的,并提供了GIMME的预测能力的首次测试。中子缺陷的$^{36} $ Ca的放射性光束是在国家超导回旋实验室中通过弹丸碎片制作而产生的。光束被热化,质量为$^{36} $ ca $^+$和$^{36} $ ca $^{2+} $,按飞行时间-Libit 9.4 t Penning陷阱中的ION CYCLOTRON RESONANCE方法测量。我们测量$^{36} $ ca的质量过量为我$ = -6483.6(56)$ kev,精确度的提高了6倍。新基准以及对$ a = 36 $,$ t = 2 $五重奏的评估核数据进行了考虑。我们发现与Impin对称性给出的IMME的二次形式一致,但仅与gimme的预测相同的粗糙定性一致。总共三个同质五重奏组具有通过笔陷阱质谱法测量的最外来成员。 $ t = 2 $五重奏中的gimme预测似乎以$ a = 32 $及更大的速度分解。
Isobaric quintets provide the best test of the isobaric multiplet mass equation (IMME) and can uniquely identify higher order corrections suggestive of isospin symmetry breaking effects in the nuclear Hamiltonian. The Generalized IMME (GIMME) is a novel microscopic interaction theory that predicts an extension to the quadratic form of the IMME. Only the $A=20, 32$ $T=2$ quintets have the exotic $T_z = -2$ member ground state mass determined to high-precision by Penning trap mass spectrometry. In this work, we establish $A=36$ as the third high-precision $T=2$ isobaric quintet with the $T_z = -2$ member ground state mass measured by Penning trap mass spectrometry and provide the first test of the predictive power of the GIMME. A radioactive beam of neutron-deficient $^{36}$Ca was produced by projectile fragmentation at the National Superconducting Cyclotron Laboratory. The beam was thermalized and the mass of $^{36}$Ca$^+$ and $^{36}$Ca$^{2+}$ measured by the Time of Flight - Ion Cyclotron Resonance method in the LEBIT 9.4 T Penning trap. We measure the mass excess of $^{36}$Ca to be ME$ = -6483.6(56)$ keV, an improvement in precision by a factor of 6 over the literature value. The new datum is considered together with evaluated nuclear data on the $A=36$, $T=2$ quintet. We find agreement with the quadratic form of the IMME given by isospin symmetry, but only coarse qualitative agreement with predictions of the GIMME. A total of three isobaric quintets have their most exotic members measured by Penning trap mass spectrometry. The GIMME predictions in the $T = 2$ quintet appear to break down for $A = 32$ and greater.