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arXiv 2108.07360nucl-thnucl-ex
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二能级形状共存模型中$^{43}$ P和$^{42}$ Si的结构

Structure of $^{43}$P and $^{42}$Si in a two-level shape-coexistence model

A. O. Macchiavelli, H. L. Crawford, C. M. Campbell, R. M. Clark, M. Cromaz, P. Fallon, I. Y. Lee, A. Gade, A. Poves, E. Rice

摘要:

排他性截面的$^{43}$ P $(-1p)^{42}$ Si反应的最低的$0^+$和$2^+$状态,测量在NSCL与GRETINA和S800,解释在一个两级混合(集体)模型的扁圆和扁长共存的形状。使用变形核的形式,我们计算了强耦合极限下的光谱振幅和排他截面,其中对于$^{43}$ P,示意波函数包括Nilsson [211] $\frac{1}{2}$质子轨道的耦合。与实验数据吻合良好时,扁圆配置的振幅为$\gtrsim$ 80\%,表明这两个核主要是扁圆,符合理论预期。

英文摘要:

Exclusive cross sections for the $^{43}$P$(-1p)^{42}$Si reaction to the lowest $0^+$ and $2^+$ states, measured at NSCL with GRETINA and the S800, are interpreted in terms of a two-level mixing (collective) model of oblate and prolate co-existing shapes. Using the formalism developed for deformed nuclei we calculate the spectroscopic amplitudes and exclusive cross-sections in the strong coupling limit, where for $^{43}$P the schematic wavefunction includes the coupling of the Nilsson [211]$\frac{1}{2}$ proton orbit. Good agreement with the experimental data is obtained when the amplitude of the oblate configuration is $\gtrsim$ 80\%, suggesting that both nuclei are predominantly oblate, in line with theoretical expectations.

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