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Isovector part of optical potentials studied through analog transitions in the (p, n) reaction at 35-MeV

  • Jon, G. C.
  • Orihara, H.
  • Yun, C. C.
  • Terakawa, A.
  • Itoh, K.
  • Yamamoto, A.
  • Suzuki, H.
  • Mizuno, H.
  • Kamurai, G.
  • Ishii, K.
  • Ohnuma, H.
Publication Date
Jan 01, 2000
DOI: 10.1103/PhysRevC.62.044609
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Quasielastic (p, n) reactions were studied at an incident proton energy of 35 MeV. Differential cross sections for isobaric analog ΔJπ=0+ (Fermi-type) transitions and their angular distributions were measured in 27 N>Z target nuclei 7Li, 9Be, 13,14C, 15N, 50Cr, 54,56Fe, 58,60,62,64Ni, 70Zn, 71Ga, 92Zr, 110,112,114,115Cd, 116,118,120Sn, 140Ce, 172,174,176Yb, and 208Pb. Pure ΔJπ=0+ Fermi-type transitions were observed in 23 of them. As for the four light odd-A nuclei, contributions from mixed ΔJπ≠0+ components were evaluated by microscopic distorted-wave Born approximation (DWBA) calculations to subtract them from the raw data and extract pure Fermi-type transition strengths. Thus 27 ΔJπ=0+ angular distributions were obtained, and fitted by macroscopic DWBA calculations with the Lane-model optical potential to derive systematically the isovector part of the potential. The best-fit parameters for each target are presented. The present results combined with our previous analysis on 13 other nuclei in the 17<~A<~48 region cover almost the entire mass region. They were used to obtain A-dependent global parameters by least-squares fit.

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