Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 71: Nuclear Structure and Dynamics I

HK 71.6: Talk

Thursday, March 19, 2009, 18:30–18:45, H-ZO 40

Time-dependent-Hartree-Fock-Bogoliubov monopole response in even-even superfluid spherical nuclei — •Sara Fracasso and Paul D. Stevenson — University of Surrey, Guildford, Surrey, GU27XH (UK)

The monopole linear response has been investigated in even-even spherically symmetric systems, such as Oxygen and Calcium isotopes, by means of a radial Time-dependent-Hartree-Fock-Bogoliubov (TDHFB) approach, based on a Skyrme functional complemented with a zero-range density dependent pairing force [1]. A new code (TDHFBrad) has been developed to perform the time evolution of the HFB solutions, currently obtained with HFBRAD [2].

Our calculations, the first of their kind and which follow the recent TDHFB predictions for the pairing-vibrations [3], are compared with the available experimental data. Consequences of the complex character of the anomalous densities are in particular discussed.

A comparison with results from the self-consistent HFB+QRPA of [4] has also been performed. Besides the inclusion of both the residual spin-orbit and Coulomb terms in QRPA, the same energy density functional in both the normal and the anomalous sector has been implemented in the two models, whose parameters have been tuned to allow a reasonable comparison. These features allow us to draw quite robust conclusions.

[1] S. Fracasso et al., in preparation; [2] K. Bennaceur et al., Comp. Phys. Comm. 168, 96 (2005); [3] B. Avez et al., Phys. Rev. C 78, 044318 (2008); [4] J. Li et al., Phys. Rev. C 78, 064304 (2008).