One-step energy scanning of wide low-lying 1- resonances in 13C+p and 13N+p scattering

摘要: Thick polyethylene targets have been bombarded with 8.2 MeV C-13 and N-13 beams accelerated by a cyclotron, i.e. having relatively large energy spread of about 200 keV. Recoil protons detected in order to observe the J(pi) = 1- wide resonances at E* 8.06 5.17 N-14 O-14 compound nuclei, respectively. It is shown that accurate values energy, width spin resonant states can be obtained under experimental conditions which, first glance, may seem inappropriate. The method well suited for resonance studies using radioactive beams. measured (GAMMA 33.7 +/- 1.0 keV) disagrees recent measurement 23 keV). was determined E(c.m) 526 3 keV instead 545 10 as quoted literature. A new parameter-free microscopic calculation undertaken solve an apparent discrepancy between proton previous calculation.