Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2012-03-16
Physics
Nuclear Physics
Nuclear Theory
23 pages, 7 figures, 3 tables, submitted to Physical Review C
Scientific paper
The relativistic proton-neutron quasiparticle random phase approximation (pn-RQRPA) is applied in the calculation of the L=0 strength in charge-exchange reactions on $^{48}$Ca, $^{90}$Zr, $^{208}$Pb and nuclei in the Sn isotopic chain. The microscopic theoretical framework is based on the relativistic Hartree-Bogoliubov (RHB) model for the nuclear ground state. The calculation is fully self-consistent, i.e. the same interaction is used both in the RHB equations that determine the quasiparticle basis, and in the matrix equations of the pn-RQRPA. The inclusion of the higher-order terms that include the effect of finite momentum transfer, primarily the isovector spin monopole (IVSM) term, in the transition operator shifts a portion of the strength to the high-energy region above the Gamow-Teller (GT) resonance. The total strength is slightly enhanced in nuclei with small neutron-to-proton ratio but remains unchanged with increasing neutron excess. Based on the strength obtained using the full L=0 transition operator in the pn-RQRPA calculation, we have estimated the impact of the IVSM on the strength measured in the charge-exchagne reactions on $^{90}$Zr and found that the data are consistent with the Ikeda sum rule.
Marketin T.
Martinez-Pinedo Gabriel
Paar Nils
Vretenar Dario
No associations
LandOfFree
Role of momentum transfer in the quenching of Gamow-Teller strength 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 Role of momentum transfer in the quenching of Gamow-Teller strength, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Role of momentum transfer in the quenching of Gamow-Teller strength will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-351769