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• W2383256319 abstract "We present an extension of the random-phase approximation (RPA) where the RPA phonons are used as building blocks to construct the excited states. In our model, that we call double RPA (DRPA), we include up to two RPA phonons. This is an approximate and simplified way, with respect to the full second random-phase approximation (SRPA), to extend the RPA by including two-particle--two-hole configurations. Some limitations of the standard SRPA model, related to the violation of the stability condition, are not encountered in the DRPA. We also verify in this work that the energy-weighted sum rules are satisfied. The DRPA is applied to low-energy modes and giant resonances in the nucleus $^{16}mathrm{O}$. We show that the model (i) produces a global downwards shift of the energies with respect to the RPA spectra and (ii) provides a shift that is, however, strongly reduced compared to that generated by the standard SRPA. This model represents an alternative way of correcting for the SRPA anomalous energy shift, compared to a recently developed extension of the SRPA, where a subtraction procedure is applied. The DRPA provides results in good agreement with the experimental energies, with the exception of those low-lying states that have a dominant two-particle--two-hole nature. For describing such states, higher-order calculations are needed." @default.
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• W2383256319 date "2016-02-09" @default.
• W2383256319 modified "2023-10-18" @default.
• W2383256319 title "Nuclear excitations as coupled one and two random-phase-approximation modes" @default.
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• W2383256319 doi "https://doi.org/10.1103/physrevc.93.024309" @default.
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