Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2011-08-08
Phys. Rev. C 83, 064316 (2011)
Physics
Nuclear Physics
Nuclear Theory
Scientific paper
10.1103/PhysRevC.83.064316
The E1 strength function for 15 stable and unstable Sn even-even isotopes from A=100 till A=176 are calculated using the self-consistent microscopic theory which, in addition to the standard (Q)RPA approach, takes into account the single-particle continuum and the phonon coupling. Our analysis shows two distinct regions for which the integral characteristics of both the giant and pygmy resonances behave rather differently. For neutron-rich nuclei, starting from $^{132}$Sn, we obtain a giant E1 resonance which significantly deviates from the widely-used systematics extrapolated from experimental data in the $\beta$-stability valley. We show that the inclusion of the phonon coupling is necessary for a proper description of the low-energy pygmy resonances and the corresponding transition densities for $A<$132 nuclei, while in the $A>132$ region the influence of phonon coupling is significantly smaller. The radiative neutron capture cross sections leading to the stable $^{124}$Sn and unstable $^{132}$Sn and $^{150}$Sn nuclei are calculated with both the (Q)RPA and the beyond-(Q)RPA strength functions and shown to be sensitive to both the predicted low-lying strength and the phonon coupling contribution. The comparison with the widely-used phenomenological Generalized Lorentzian approach shows considerable differences both for the strength function and the radiative neutron capture cross section. In particular, for the neutron-rich $^{150}$Sn, the reaction cross section is found to be increased by a factor greater than 20. We conclude that the present approach may provide a complete and coherent description of the $\gamma$-ray strength function for astrophysics applications. In particular, such calculations are highly recommended for a reliable estimate of the electromagnetic properties of exotic nuclei.
Avdeenkov A.
Goriely Stephane
Kamerdzhiev Sergei
Krewald Siegfried
No associations
LandOfFree
Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes 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 Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-190253