Abstract The novel nuclear structure in neutron-rich nuclei — the new magicity N = 32 and 34 has been confirmed by the intensive experiment measurements (F. Wienholtz et al. (2013) [17] ; D. Steppenbeck et al. (2013) [22] ; S. Michimasa et al. (2018) [28] ; etc.). However, the underlying mechanism of the new magicity is still under discussion. In this letter, we present a new mechanism that the strong couplings between the s 1 / 2 (including both neutron and proton ones with different principle numbers) and neutron (ν) ν 2 p 1 / 2 orbits, referred as “Dirac inversion partners” (DIPs) which are of the same total angular momentums but opposite parity, play a key role in opening both subshells at N = 32 and 34. Such strong couplings originate from the inversion similarity between the DIPs, that the upper component of the Dirac spinor of one partner shares the same angular momentum as the lower component of the other, and vice versa. Following the revealed mechanism, it is predicted that on the proton deficient side ( Z ⩽ 20 ) the magicity N = 32 is reserved from 52Ca until 48S, but vanishes in 46Si.

中文翻译：

---

由于狄拉克反演伙伴之间的强耦合，新的魔法 N = 32 和 34

摘要 富中子核中的新核结构——新的神奇 N = 32 和 34 已被密集的实验测量证实（F. Wienholtz 等人 (2013) [17] ; D. Steppenbeck 等人 (2013) [22] ; S. Michimasa 等人 (2018) [28] ; 等)。然而，新魔法的潜在机制仍在讨论中。在这封信中，我们提出了一种新机制，即 s 1 / 2（包括具有不同原理数的中子和质子）与中子 (ν) ν 2 p 1 / 2 轨道之间的强耦合，称为“狄拉克反演伙伴” ”（DIP）具有相同的总角动量但相反的奇偶性，在 N = 32 和 34 处打开两个子壳中起着关键作用。这种强耦合源于 DIP 之间的反演相似性，一方的狄拉克旋量的上部分量与另一方的下部分量共享相同的角动量，反之亦然。根据揭示的机制，预测在质子缺陷侧（ Z ⩽ 20 ），神奇性 N = 32 从 52Ca 保留到 48S，但在 46Si 中消失。