# High-spin structures of $^{136} {54}$Xe, $^{137} {55}$Cs, $^{138} {56}$Ba, $^{139} {57}$La, and $^{140} {58}$Ce : A shell model description

High-spin structures of $^{136} {54}$Xe, $^{137} {55}$Cs, $^{138} {56}$Ba, $^{139} {57}$La, and $^{140} {58}$Ce : A shell model description - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

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In the present work recently available experimental data A. Astier et al, Phys. Rev. C 85, 064316 (2012) for high-spin states of five N=82 isotones, $^{136} {54}$Xe, $^{137} {55}$Cs, $^{138} {56}$Ba, $^{139} {57}$La, and $^{140} {58}$Ce have been interpreted with state-of-the-art shell model calculations. The calculations have been performed in the 50-82 valence shell composed of $1g {7-2}$, $2d {5-2}$, $1h {11-2}$, $3s {1-2}$, and $2d {3-2}$ orbitals. We have compared our results with the available experimental data for excitation energies including high-spin states, occupancy numbers and transition probabilities. As expected the structure of these isotones are due to proton excitations across Z=50 shell. The structure of the positive-parity states are mainly from $(\pi g {7-2}\pi d {5-2})^n$ and $(\pi g {7-2}\pi d {5-2})^{n-2}(\pi h {11-2})^2$ configurations, while the negative-parity states have $(\pi g {7-2}\pi d {5-2})^{n}(\pi h {11-2})^1$ configuration. Additionally, for the $^{136} {54}$Xe, $^{137} {55}$Cs and $^{138} {56}$Ba isotones the excitation of the neutrons across N=82 gap is important.

Autor: P. C. Srivastava; M. J. Ermamatov; Irving O. Morales

Fuente: https://archive.org/