ELECTROMAGNETIC PROCESSES IN _χEFT

Conference · Wed Apr 01 00:00:00 EDT 2009 · Mod. Phys. Lett. A

DOI:https://doi.org/10.1142/s0217732309000310· OSTI ID:2000732

PASTORE, S. ^[1]; SCHIAVILLA, R. ^[2]; GOITY, J. L. ^[3]

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1. Physics Department, Old Dominion University, Norfolk, VA 23529, USA
2. Physics Department, Old Dominion University, Norfolk, VA 23529, USA;Theory Center, Jefferson Laboratory, Newport News, VA 23606, USA
3. Theory Center, Jefferson Laboratory, Newport News, VA 23606, USA;Physics Department, Hampton University, Hampton, VA 23668, USA

Nuclear electromagnetic currents derived in a chiral-effective-field-theory framework including explicit nucleons, $$\Delta$$ isobars, and pions up to 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$$=2 and 3 nuclei magnetic moments. With the strengths of the $$\Delta$$-excitation currents determined to reproduce the $$n$$-$$p$$ cross section and isovector combination of the trinucleon magnetic moments, we find that the cross section and photon circular polarization parameter, measured respectively in $$n$$-$$d$$ and $$\vec{n}$$-$$d$ processes, are significantly underpredicted by theory.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 2000732
• Report Number(s): JLAB-THY-08-878; arXiv:0809.2555; DOE/OR/23177-0492
• Journal Information: Mod. Phys. Lett. A, Vol. 24, Issue 11-13; Conference: 4th Asia-Pacific Conference on Few-Body Problems in Physics 2008 (APFB 08) 19-23 August 2008. Depok, Indonesia; ISSN 0217-7323
• Country of Publication: United States
• Language: English