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Title: Electromagnetic two-body currents of one- and two-pion range

Journal Article · · Physical Review C

Nuclear electromagnetic currents are derived in time-ordered perturbation theory within an effective-field-theory framework including explicit nucleons, $$\Delta$$ isobars, and pions up to one loop, or N$^3$LO. The currents obtained at N$^2$$LO, {\it i.e.}~ignoring loop corrections, are used in a study of neutron radiative captures on protons and deuterons at thermal energies, and of $$A$$=2 and 3 nuclei magnetic moments. The wave functions for $$A$$=2 are derived from solutions of the Schr\"odinger equation with the Argonne $$v_{18}$ (AV18) or CD-Bonn (CDB) potentials, while those for $$A$$=3 are obtained with the hyperspherical-harmonics-expansion method from a realistic Hamiltonian including, in addition to the AV18 or CDB two-nucleon, also a three-nucleon potential. With the strengths of the $$\Delta$$-excitation currents occurring at N$^2$LO determined to reproduce the $$n$$-$$p$$ cross section and isovector combination of the trinucleon magnetic moments, we find that the cro

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-060R23177
OSTI ID:
956079
Report Number(s):
JLAB-THY-08-885; arXiv:0810.1941; DOE/OR/23177-0499
Journal Information:
Physical Review C, Vol. 78
Country of Publication:
United States
Language:
English

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