Random matrix analysis of the monopole strength distribution in 208Pb
- Severyukhin, A. P.
- Aberg, S.
- Arsenyev, N. N.
- Nazmitdinov,Rashid
- Pichugin, K. N.
DOI Publisher
Pleiades Publishing LtdAbstract
[eng] We study statistical properties of the 0+ spectrum of 208Pb in the energy region Ex <20 MeV. We use the Skyrme interaction SLy4 as our model Hamiltonian to create a single-particle spectrum and to analyze excited states. The finite-rank separable approximation for the particle-hole interaction enables us to perform the calculations in large configuration spaces. We show that while the position of the monopole resonance centroid is determined by one-phonon excitations of 0+, the phonon-phonon coupling is crucial for the description of the strength distribution of the 0+ spectrum. In fact, this coupling has an impact on the spectral rigidity Δ3(L) which is shifted towards the random matrix limit of the Gaussian orthogonal ensembles
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