Publications [#313680] of Anton P. Tonchev

Papers Published
  1. Tonchev, AP; Nelson, SO; Sabourov, K; Crowley, BT; Joshi, K; Weller, HR; Kelley, JH; Prior, RM; Spraker, M; Kalantar-Nayestanaki, N, The10B(p→, γ)11C reaction at astrophysically relevant energies, Physical Review C, vol. 68 no. 4 (January, 2003), pp. 458031-4580312 .

    The 10 B(p→, γ) 11 C reaction was studied by detecting the γ-rays produced when 100-, 130-, and 160-keV polarized protons were stopped in a thick 10 B target. Polarized and unpolarized incident beams were used to measure the cross section and vector analyzing power as a function of angle and energy for capture to the ground (J π =3/2 - ), the second (E=4319 keV, J π =5/2 - ), and the fifth (E=6478 keV, J π =7/2 - ) excited states of 11 C. The data were analyzed to obtain the amplitudes and phases of the contributing transition-matrix elements at each measured energy for all three transitions. Values of the astrophysical S factors were obtained from the cross section data and are compared to previous results. A direct capture plus resonance model calculation was performed in an attempt to account for all measured quantities. It was found that the large (∼32%) value of A y (90°) observed in the case of capture to the ground state could be accounted for by including the subthreshold resonance at 8420 keV.