Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-03-18
Few Body Syst. 32 (2002) 83-117
Physics
Nuclear Physics
Nuclear Theory
46 pages, 21 figures
Scientific paper
10.1007/s00601-002-0109-1
Radiative nucleon-deuteron capture and photo disintegration of the three-nucleo n bound state with two-body final states are described. The description uses nucleon degrees of freedom extended to include the excitation of a single nucleon to a \diso. The baryonic interaction and the electromagnetic cu rrent couple nucleonic states and states with a \diso. Exact solutions of three-p article scattering equations are employed for the initial or final states of the reactions. The current has one-baryon and two-baryon contributions. The role of t he \diso in the description of the considered photo reactions is discussed and fo und to be moderate. The spin observables $A_{yy}$ and $T_{20}$ at $90^{\circ}$ la b scattering angle can be calculated model-independently from the $E1$ Siegert te rm in the long-wavelength limit.
Adam J. Jr.
Chmielewski K.
Fonseca Antonio C.
Oelsner M.
Sauer Peter U.
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