Elsevier

Nuclear Physics A

Volume 405, Issue 1, 22 August 1983, Pages 141-158
Nuclear Physics A

Resonant charged particle emission from 11B+p and 12C states at x = 20−23 MeV

https://doi.org/10.1016/0375-9474(83)90328-7Get rights and content

Abstract

Absolute differential cross sections of the reactions 11B(p, pi)11B(i), i = 0−3, and 11B(p, α0)8Be have been measured at about 20 angles for up to 37 bombarding energies Ep = 4.5−7.5 MeV corresponding to excitation energies Ex(12C) = 20.1−22.8 MeV. Several compound resonances are observed for which from their angular distributions the following spin and parity assignments were derived: Ex = 20.25 MeV (J)π = 1+), 20.63 (3), 21.52 (3), 21.99 (1), and 22.47 (3). The positions and widths of the resonances were determined by R-matrix formulae. In all cases the sum of the proton partial widths virtually exhausts the total width indicating dominant 1p1h configurations. The resonances at 20.25, 20.63 and, tentatively, 21.99 MeV are identified to be the Tz = 0 analog states of low-lying T = 1 multiplets. A strong Jπ = 2+ background was found throughout the whole energy range which was taken to be the low-energy tail of the isoscalar giant quadrupole resonance.

References (37)

  • F. Ajzenberg-Selove et al.

    Nucl. Phys.

    (1980)
  • D. Halderson et al.

    Nucl. Phys.

    (1980)
  • N. Vinh-Mau et al.

    Nucl. Phys.

    (1962)
  • V. Gillet et al.

    Nucl. Phys.

    (1964)
  • G.D. Symons et al.

    Nucl. Phys.

    (1963)
  • H. Fuchs et al.

    Nucl. Phys.

    (1974)
  • R.M. White et al.

    Nucl. Phys.

    (1980)
  • J.F. Cavaignac et al.

    Nucl. Phys.

    (1971)
  • W. Buck et al.

    Nucl. Phys.

    (1977)
  • G.J. Legge et al.

    Nucl. Phys.

    (1961)
  • J.K. Bair et al.

    Nucl. Phys.

    (1964)
  • J.C. Overley et al.

    Nucl. Phys.

    (1965)
  • W. Buck et al.

    Nucl. Phys.

    (1978)
  • M. Buenerd et al.

    Nucl. Phys.

    (1977)
  • E. Grecksch et al.

    Z. Phys.

    (1981)
  • J.E. Monahan et al.

    Phys. Rev.

    (1971)
  • C.F. Maguire et al.

    Phys. Rev.

    (1976)
  • R.E. Segel et al.

    Phys. Rev.

    (1965)
  • Cited by (0)

    View full text