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Highly Excited States in C11. Elastic Scattering of Protons by B10

Overley, J. C. and Whaling, Ward (1962) Highly Excited States in C11. Elastic Scattering of Protons by B10. Physical Review, 128 (1). pp. 315-324. ISSN 0031-899X. doi:10.1103/PhysRev.128.315.

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Excitation functions for the elastic scattering of protons by B10 have been measured at center-of-mass scattering angles near 90°, 125°, and 160° for proton energies between Ep=0.15 MeV and Ep=3.0 MeV. Scattering angular distributions were measured at 43 selected energies in this range. An excitation function for the reaction B10(p, α0)Be7 was also measured between Ep=1.5 MeV and Ep=2.6 MeV at a laboratory angle of 90°. The atomic stopping cross section of boron for protons has been determined between Ep=0.1 MeV and Ep=3.0 MeV. The elastic scattering excitation functions exhibit conspicuous anomalies at Ep=1.50 MeV and Ep=2.180 MeV. The α0 transition to the ground state of Be7 is also resonant at Ep=2.180 MeV. The behavior of the cross sections in these regions has been analyzed in terms of compound states of C11. Satisfactory agreement is achieved with level assignments of Jπ=7/2+ with ER=1.50 MeV, Γp=90 keV, ΓT=250 keV; and Jπ=9/2+ with ER=2.180 MeV, Γp=100 keV, Γα0=100 kev, and ΓT=200 keV. Although complete analysis of the scattering is hindered by the influence of unknown background processes, the negative parity assignment for the previously reported state at Ep=1.17 MeV, derived from other reaction experiments, appears inconsistent with the scattering.

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Additional Information:©1962 The American Physical Society Received 21 May 1962 We wish to thank the staff of the Kellogg Radiation Laboratory for the interest shown in this woprk, In particular, we should like to thank Professor T. Lauritsen for many valuable discussions, and Mrs. Barbara Zimmerman for indispenable aid in programming the Burroughs 220 Digital Computer.
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Deposited On:30 Aug 2006
Last Modified:08 Nov 2021 20:18

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