Seminar Details

Searching for “Nuclear Molecules”: − Clustering in 10Be and 10B

Anthony Kuchera, Florida State University
Friday, July 19, 1:30 PM - Special Seminar
NSCL Seminar Room

Clustering of α particles can play a large role in light atomic nuclei. For example, multicenter structures built on the well-known low-lying states of 8Be can be formed. The addition of nucleons to the system may result in covalent-like bonding between the two α−cores. These structures have been called “nuclear molecules” because of their analog to atomic molecules. The results of two recent experiments are discussed. The T = 1 states in 10B between Ex = 8.7 − 12.1 MeV were studied using the 1H(9Be,α)6Li*(T = 1, 0+, 3.56 MeV) reaction. An R−matrix analysis was used to extract parameters for the five resonances observed. The widths of the known 2+ resonance at 8.9 MeV have been measured and support the theoretical predictions that it is a highly clustered state and can be identified as a member of the α – np − α rotational band. In a second experiment, 6He+4He elastic scattering was used to probe resonances in 10Be in search of α – 2n – α structures. Using the active target detector system, ANASEN, the excitation function was measured from Ex = 9.5 − 15.4 MeV. Preliminary results and interpretations of what has been observed will be discussed.