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arXiv 1801.08982nucl-th
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奇质量核的斜轴摆动

Tilted-axis wobbling in odd-mass nuclei

R. Budaca

摘要:

利用含时变分原理,利用角动量相干态,研究了含刚性排列高$j$准粒子的三轴转子哈密顿量。由此得到的经典能量函数在广义共轭坐标空间中有三个唯一的临界点,这可以使能量最小化,对于特定的惯性参数和固定的角动量状态。由于问题的对称性,只有两个唯一的解决方案,分别对应于围绕主轴和倾斜轴的摆动运动。量化过程后获得抖动频率,然后用于计算$E2$和$M1$跃迁概率。利用解析结果研究了$^{135}$ Pr核的摆动激发,发现它经历了从低角动量的绕主轴的横向摆动到高角动量的斜轴摆动的转变.

英文摘要:

A triaxial rotor Hamiltonian with a rigidly aligned high-$j$ quasiparticle is treated by a time-dependent variational principle, using angular momentum coherent states. The resulting classical energy function have three unique critical points in a space of generalized conjugate coordinates, which can minimize the energy for specific ordering of the inertial parameters and a fixed angular momentum state. Due to the symmetry of the problem, there are only two unique solutions, corresponding to wobbling motion around a principal axis and respectively a tilted-axis. The wobbling frequencies are obtained after a quantization procedure and then used to calculate $E2$ and $M1$ transition probabilities. The analytical results are employed in the study of the wobbling excitations of $^{135}$Pr nucleus, which is found to undergo a transition from low angular momentum transverse wobbling around a principal axis toward a tilted-axis wobbling at higher angular momentum.

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