91̽»¨

Abstract:

Results from investigations of the Tz = 3 2 nuclei 5H, 7He and 9Li and of the T = 1 nuclide 4H employing the (6Li, 8B) reaction at 80 and 93 MeV are presented. In 9Li the locations of several low-lying Ip shell levels are indicated; in 7He and 4H the ground states are clearly observed. No evidence is found for the formation of a narrow 5H ground state. © 1977.

Abstract:

The ¹⁹F(p, p′γ)¹⁹F reaction and Ge(Li) detectors were used to study the decay schemes of the ¹⁹F 3.91 and 4.55 MeV levels. The 3.91 MeV level was observed to decay mainly to the ground state, and two closely spaced levels were found at 4.549 and 4.558 MeV excitation. The former is identified as a 5 2⁺ level and the assignment of the latter is limited to 3 2^- or 1 2^- with 3 2^- preferred. Lifetimes of states in ¹⁹F below 5 MeV were measured using the Doppler shift attenuation technique. Values of Ï„m = 60±15 fs (4.033 MeV), 270±40 (2.780), 100±20 (1.459), 3500±1300 (1.346) and limits of Ï„m < 30 fs (4.683 MeV), < 30 (4.558), < 30 (4.549), < 40 (3.999), < 50 (3.907) and < 40 (1.554) were obtained. © 1976.

Abstract:

Data for the (Li6, B8) reaction on targets of B10, C12, C13, and O16 at 80 and 93 MeV are presented. Spectroscopic selectivity is observed and evidence for the dominance of spatially symmetric transfer of the two protons is shown. On the Tz=0 targets a close similarity is found to the analogous (p, t) reaction, and the C13 results indicate the location of low-lying 1p-shell states in Be11. NUCLEAR REACTIONS B10(Li6, B8), C12(Li6, B8), C13(Li6, B8), O16(Li6, B8), E=80, 93 MeV; measured σ(Ef, θ); energy levels Li8, Be10, Be11, C14; assessed importance of spatially antisymmetric transfer; comparisons with two-neutron pickup reactions leading to analog states and with two-particle spectroscopic amplitudes; resolution 300 keV. © 1976 The American Physical Society.