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Monopole effects and cross-shell excitations in particle-hole systems 134–136Xe
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DOI：10.1007/s41365-026-02035-9.png)
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Abstract
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The particle-hole nuclei $$^{134-136}$$ Xe are studied using large-scale shell-model calculations with an extended pairing-plus-multipole interaction and monopole corrections. The negative-parity states $$2^{-}$$ to $$8^{-}$$ in $$^{136}$$ Xe are predicted at 3.4–3.9 MeV. The quantitative analysis reveals that the monopole effects provide the dominant contribution to reproducing the spectroscopic structure of $$^{135}$$ Xe. The monopole effects between the $$\pi g_{7/2}$$ and $$\nu h_{11/2}$$ orbits substantially improve the shell-model precision in these particle-hole nuclei $$^{134-136}$$ Xe near the doubly magic nucleus $$^{132}$$ Sn.
Keywords:
Monopole interaction effects
Cross-shell excitations
Particle-hole nuclei
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