Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.
Phys Rev Lett. 2012 Sep 7;109(10):102501. doi: 10.1103/PhysRevLett.109.102501. Epub 2012 Sep 4.
Isochronous mass spectrometry has been applied to neutron-deficient 58Ni projectile fragments at the HIRFL-CSR facility in Lanzhou, China. Masses of a series of short-lived T(z)=-3/2 nuclides including 41Ti, 45Cr, 49Fe, and 53Ni have been measured with a precision of 20-40 keV. The new data enable us to test for the first time the isobaric multiplet mass equation (IMME) in fp-shell nuclei. We observe that the IMME is inconsistent with the generally accepted quadratic form for the A=53, T=3/2 quartet. We perform full space shell model calculations and compare them with the new experimental results.
等时性质谱已应用于中国兰州重离子研究装置（HIRFL-CSR）中缺失中子的 58Ni 射弹碎片。我们利用精度为 20-40keV 的方法测量了包括 41Ti、45Cr、49Fe 和 53Ni 在内的一系列短寿命 T(z)=-3/2 核素的质量。新数据使我们首次能够对 fp 壳核的等压多重线质量方程（IMME）进行测试。我们观察到，IMME 与普遍接受的 A=53，T=3/2 四重线的二次形式不一致。我们进行了全空间壳模型计算，并将其与新的实验结果进行了比较。
