Regular Article - Experimental Physics

New determination of the astrophysical ¹³C( p, γ) ¹⁴N S(E) factors and reaction rates via the ¹³C(⁷Li, ⁶He) ¹⁴N reaction

¹ China Institute of Atomic Energy (CIAE), P. O. Box 275(10), 102413, Beijing, PRC
² Institute of Modern Physics, Chinese Academy of Sciences (CAS), 730000, Lanzhou, PRC

^* e-mail: zhli@ciae.ac.cn

Received: 23 October 2011
Revised: 8 January 2012
Accepted: 23 January 2012
Published online: 9 February 2012

Abstract

The ¹³C(⁷Li, ⁶He) ¹⁴ N_0,1 reactions were measured at E (⁷Li) = 34 MeV with the Q3D magnetic spectrometer of the HI-13 tandem accelerator, and the first peaks of the angular distributions were obtained for the first time. The ¹⁴N_0,1 proton spectroscopic factors were extracted to be 0.67±0.09 and 0.73±0.10 , respectively. Using the ¹³C(p, γ) ¹⁴N direct capture S _dc(E) factors derived by the spectroscopic factors, the direct measurement data for both 1⁻ and 0⁻ resonances were well fitted via updating the resonance parameters, and then the total astrophysical ¹³C(p, γ) ¹⁴N S(E) factors and reaction rates were determined at stellar energies. The present work offers an independent examination to the existing results of the ¹³ C(p, γ) ¹⁴N reaction.