Study of the 18.30 and 19.40 MeV states in 12C in intermediate energy proton scattering

doi:10.1016/0370-2693(83)90260-5

Physics Letters B

Volume 128, Issue 5, 1 September 1983, Pages 281-284

https://doi.org/10.1016/0370-2693(83)90260-5 Get rights and content

Abstract

Angular distributions of the cross section and analyzing power have been measured for proton inelastic scattering from ¹²C at 398, 597, and 698 MeV. Angular distributions of the spin-flip probability have been measured at 398 MeV. Comparison of these data with DWIA calculations strongly suggests 2⁻(T = 0) and 2⁻(T = 1) assignments to states at 18.30 and 19.40 MeV, respectively; their wave functions are well described by recent calculations of Millener.

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Energy levels of light nuclei A = 12
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The deuteron single and double spin-flip probabilities, S₁ and S₂, have been measured for the ¹²C $(d →; d → ′)$ reaction at E_d=270 MeV for an excitation energy range between 4 and 24 MeV and a scattering angular range between Θ_lab=2.5° and 7.5°. The extracted S₁ exhibits characteristic values depending on the structure of the excited state. The S₂ is close to zero over the measured excitation energy range. The SFP angular distribution data for the 2⁺ (4.44 MeV) and 1⁺ (12.71 MeV) states are well described by the microscopic DWIA calculations.
Polarization transfer observables for proton inelastic scattering from 12C at 0°
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Polarization transfer (PT) observables in the $^{12} C (p,p′)$ reaction at 0° for 392 MeV protons have been measured. The excitation strengths are decomposed into the spin-flip part and the non-spin-flip part by using the obtained PT observables. The PT observables for excitation of the 1⁺, T=0 and 1⁺, T=1 states are compared with distorted wave impulse approximation calculations. The strength ratios of the isoscalar spin-dependent term to the isovector tensor term and the isovector tensor term to the isovector spin-dependent term are reasonably consistent with the Franey and Love interaction.
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The inclusive ¹²C(p,p′) and exclusive ¹²C(p,p′X) reactions have been studied with a beam energy of 156 MeV and for X = p and α. The study focuses on the (p,p′X) reaction mechanism and on the structure of ¹²C just above the particle-emission threshold, 14 ≤ E_x ≤ 28 MeV. Cross sections were simultaneously measured for all three reactions. The exclusive data were analyzed by making multiple-peak fits of the spectra and by Legendre-polynomial fits of the angular correlations. Multiple-peak fits were also made of the inclusive spectra. An analysis of the results shows that this region of E_x consists predominantly of resonant excitations, in contradiction to the findings of previous analyses.
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¹: Present address: Los Alamos National Laboratory and University of California at Los Angeles, CA 90024, USA.

²: Permanent address: Université de Grenoble, France.

³: Present address: University of Minnesota, Minneapolis, MN 55455, USA.

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Physics Letters B

Abstract

References (22)

Nucl. Phys.

Phys. Rev.

Bull. Am. Phys. Soc.

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Cited by (23)

Energy levels of light nuclei A = 12

Measurement of single and double spin-flip probabilities in inelastic deuteron scattering on <sup>12</sup>C at 270 MeV

Polarization transfer observables for proton inelastic scattering from <sup>12</sup>C at 0°

Study of continuum nuclear structure of <sup>12</sup>C via (p,p′X) at intermediate energies

Signatures for isoscalar spin transitions excited in (d, d') reactions

Inelastic scattering of antiprotons from <sup>12</sup>C and <sup>18</sup>O at 50 and 180 MeV