[Triumf-seminars] TRIUMF Seminar today at 14:00

[postmaster at admin.triumf.ca]

Date/Time: Mon 2007-02-12 at 14:00

Location:  Auditorium          

Speaker:   Simone Baroni (Università degli Studi and INFN, Milano)

Title:     Induced pairing interaction in finite nuclei and neutron stars

Abstract: Medium fluctuations corrections renormalize pairing correlations in an important way, both in uniform matter and in finite nuclei. In uniform matter, spin fluctuations play the leading role, reducing the pairing gap in a conspicuous way. In atomic nuclei, the presence of low-lying density collective modes reverses the situation, leading to an enhancement of the gap. In the  inner crust of neutron stars, nuclei are immersed in a sea of free neutrons. The role played by medium polarization effects on pairing correlations in this system are studied, taking into account, on equal footing, both the sea of free neutrons and the nuclear lattice. Preliminary results show that the presence of nuclei (finite size effects) tends to counteract the suppression of the pairing gap determined by the spin fluctuations of the neutron sea.

Stimulants available 15 minutes before the talk.

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