Space and laboratory observation of the deuterated cyanomethyl radical HDCCN

Our observations of TMC-1 with the Yebes 40 m radio telescope in the 31.0–50.3 GHz range allowed us to detect a group of unidentified lines, showing a complex line pattern indicative of an open-shell species. The observed frequencies of these lines and the similarity of the spectral pattern with that of the 20, 2–10, 1 rotational transition of H2CCN indicate that the lines arise from the deuterated cyanomethyl radical, HDCCN. Using Fourier transform microwave spectroscopy experiments combined with electric discharges, we succeeded in producing the radical HDCCN in the laboratory and observed its 10, 1–00, 0 and 20, 2–10, 1 rotational transitions. From our observations and assuming a rotational temperature of 5 K, we derive an abundance ratio H2CCN/HDCCN = 20 ± 4. The high abundance of the deuterated form of H2CCN is well accounted for by a standard gas-phase model, in which deuteration is driven by deuteron transfer from the H2D+ molecular ion.

Measurement and analysis of 10B +12C elastic scattering at energy of 41.3MeV

Angular distribution of the [Formula: see text] elastic scattering was measured at [Formula: see text][Formula: see text]MeV. Experimental data showed a significant increase in differential cross-sections at backward angles. The optical model with phenomenological potentials reproduces well the experimental cross-sections in the region of the angles of the forward hemisphere, but is not able to explain the increase in cross-sections at large angles. The distorted wave Born approximation method was used to reproduce the experimental data at large angles [Formula: see text] by taking into consideration a deuteron transfer. Spectroscopic amplitude has been extracted for the configuration [Formula: see text]C[Formula: see text]B + [Formula: see text] from the analysis.

NEAR BARRIER REACTIONS INDUCED BY WEAKLY BOUND CLUSTER NUCLEI

Experimental excitation functions are presented for complete fusion and transfer reactions in the interaction of 6 He and 6,8,9 Li with 206 Pb , 209 Bi , and nat Pt targets. The data on fusion in the 6 He -induced reactions at energies close to the Coulomb barrier differ from predictions within the framework of the statistical model for compound nucleus decay. For these exit channels a strong enhancement has been observed. Enhancement of the cross section for neutron transfer (with the 6 He and 8,9 Li beams) and deuteron transfer (with the 6 Li beam) reactions is observed at deep sub-barrier energies. The results are discussed from the viewpoint of how the nuclear cluster structure influences the probability of interaction at near-barrier energies.