Abstract
To accumulate experimental data for theoretical investigation of threshold phenomena in nuclear reactions the excitation function of the 11B(t, p)13B reaction has been measured in the triton energy range Et=2.6-4.2 MeV which includes the threshold of the 11B(t, n)13C*(15.108 MeV, Jπ=3/2’, T=3/2) reaction at Et=3.42 MeV. With that purpose the boron layer (375 µgcm-2 thick and enriched to 92% in 11B) on tantalum backing (0.2 mm thick) were bombarded with tritons of the electrostatic tandem accelerator. Using pulsed mode of target irradiation delayed 3.681 MeV ϒ-rays after γ-decay of 13B were observed with a Ge-detector. The expected strong anomaly was seen in the range Et=3.6-4.0 MeV. It is probably threshold anomaly which owes its origin to the threshold reaction and the observed isobaric- analog state of 14C with T=2.
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