Extended Theory of Finite Fermi Systems: Application to the collective and non-collective E1 strength in $^{208}$Pb

Physics – Nuclear Physics – Nuclear Theory

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

21 figures corrected typos in author field

Scientific paper

10.1103/PhysRevC.75.014315

The Extended Theory of Finite Fermi Systems is based on the conventional Landau-Migdal theory and includes the coupling to the low-lying phonons in a consistent way. The phonons give rise to a fragmentation of the single-particle strength and to a compression of the single-particle spectrum. Both effects are crucial for a quantitative understanding of nuclear structure properties. We demonstrate the effects on the electric dipole states in $^{208}$Pb (which possesses 50% more neutrons then protons) where we calculated the low-lying non-collective spectrum as well as the high-lying collective resonances. Below 8 MeV, where one expects the so called isovector pygmy resonances, we also find a strong admixture of isoscalar strength that comes from the coupling to the high-lying isoscalar electric dipole resonance, which we obtain at about 22 MeV. The transition density of this resonance is very similar to the breathing mode, which we also calculated. We shall show that the extended theory is the correct approach for self-consistent calculations, where one starts with effective Lagrangians and effective Hamiltonians, respectively, if one wishes to describe simultaneously collective and non-collective properties of the nuclear spectrum. In all cases for which experimental data exist the agreement with the present theory results is good.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Extended Theory of Finite Fermi Systems: Application to the collective and non-collective E1 strength in $^{208}$Pb does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Extended Theory of Finite Fermi Systems: Application to the collective and non-collective E1 strength in $^{208}$Pb, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extended Theory of Finite Fermi Systems: Application to the collective and non-collective E1 strength in $^{208}$Pb will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-476594

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.