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Chiral Lagrangian Approach to Exchange Vector Currents in Nuclei | | Tae-Sun Park
; Dong-Pil Min
; Mannque Rho
; | | Date: |
12 May 1995 | | Journal: | Nucl.Phys. A596 (1996) 515-552 | | Subject: | nucl-th hep-ph | | Abstract: | Exchange vector currents are calculated up to one-loop order (corresponding to next-to-next-to-leading order) in chiral perturbation theory. As an illustration of the power of the approach, we apply the formalism to the classic nuclear process $n+p
ightarrow d +gamma$ at thermal energy. The exchange current correction comes out to be $(4.5 pm 0.3)$ in amplitude giving a predicted cross section $sigma= (334pm 3) {mbox mb}$ in excellent agreement with the experimental value $(334.2pm 0.5) {mbox mb}$. Together with the axial charge transitions computed previously, this result provides a strong support for the power of chiral Lagrangians in nuclear physics. As a by-product of our results, we suggest an open problem in the application of chiral Lagrangian approach to nuclear processes that has to do with giving a physical meaning to the short-range correlations that play an important role in nuclei. | | Source: | arXiv, nucl-th/9505017 | | Services: | Forum | Review | PDF | Favorites | |
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