Speaker
Description
Proton elastic scattering on $^{12}$C is a technique for obtaining detailed information about resonance states and energy levels of $^{13}$N. The interaction between protons and carbon nuclei is also important for ion-beam analysis (IBA) used for light element depth profiling in solids.
Discrepancies have emerged in cross-section data at laboratory scattering angles of $~$150$^o$ and 170$^o$$~$ between older and recent datasets [1-6] especially around the $E_p~=~1735~keV~$ $(\frac{5}{2}^+)$ resonance region. Evaluated data from [7], which is based on R-matrix combined with a potential model and is considered the most dependable by the IBA community, supports the older data. However, as this evaluation relies heavily on the quality and availability of experimental data, it has limitations, particularly in the interpretation of resonances, and inconsistencies with new data that keeps emerging.
In order to provide an external, data-independent analysis, we have undertaken a study employing the Multichannel Algebraic Scattering (MCAS) method [8]. This approach uses scattering potentials derived from structural models to predict resonance positions independent of amplitude evaluations or data fitting and to analyze the sensitivity of resonance magnitudes to structure model considerations.
References:
[1] S. Mazzoni, M. Chiari, L. Giuntini, P. Mando, and N. Taccetti, Proton elastic scattering cross section on carbon from 350 kev to 3 mev, Nucl. Instr. Meth. B 136-138, 86 (1998).
[2] S. Mazzoni, M. Chiari, L. Giuntini, P. Mando, and N. Taccetti, Erratum to: “proton elastic scattering cross-section on carbon from 350 kev to 3 mev” [nucl. instr. and meth. b 136–138(1998) 86–90], Nucl. Instr. Meth. B 159, 191 (1999).
[3] Z. Liu, L. Beijing, D. Zhenzhong, and H. He, Cross section measurements for 170° backscattering of protons from carbon in the energy range 0.3–3.0 mev, Nucl. Instr. Meth. B 74, 439 (1993).
[4] W. Jiang, V. Shutthanandan, S. Thevuthasan, D. E. McCready, and W. J. Weber, Carbon analysis using energetic ion beams, Nucl. Instr. Meth. B 222, 538 (2004).
[5] W. Jiang, V. Shutthanandan, S. Thevuthasan, D. E. McCready, and W. J. Weber, Erratum to: “carbon analysis using energetic ion beams”, Nucl. Instr. Meth. B 227, 450 (2005).
[6] A. Caciolli, G. Calzolai, M. Chiari, A. Climent-Font, Y. Z. Garcia, F. Lucarelli, and S. Nava, Proton elastic scattering and proton induced -ray emission cross-sections on na from 2 to 5mev, Nucl. Instr. Meth. B 266, 1392 (2008).
[7] A. Gurbich, Sigmacalc recent development and present status of the evaluated cross-sections for iba, Nucl. Instr. Meth. B 371, 27 (2016).
[8] S. Karataglidis, K. Amos, P. Fraser, and L. Canton, A New Development at the Intersection of Nuclear Structure and Reaction Theory (Springer Cham, 2019).
