Search for Excited States in 3He

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A search has been made for excited states in 3He by investigating proton-induced reactions on 6Li. The investigation consisted of two parts. In the first part, a kinematically incomplete experiment, the 3He and α-particle continua from the 6Li(p,3He) and 6Li(p,α) reactions at an incident proton energy of 45.0 MeV have been studied for structure due to excited states in 4He and 3He, respectively. The 3He and α-particle spectra were measured from 15 to 90° (lab) in steps of 5° using a ΔE-E detector telescope. The 3He spectra exhibit clearly discernible peaks due to the 20.2-MeV (0+, T=0) and 21.4-MeV (0-, T=0) excited states in 4He. In the α-particle spectra no structure has been observed that could be interpreted as due to excited states in 3He for excitation energies up to 17.5 MeV. An upper limit of 30 μb/sr could be set for the excitation of states in 3He having a width <~1.0 MeV. In the second part, a kinematically complete experiment, a study has been made of the 6Li(p,αd)p reaction at an incident proton energy of 45.0 MeV. This investigation was carried out to study final-state interactions and, in particular, to search for a possible p-d final-state interaction corresponding to a resonance in 3He. Coincidence spectra from the 6Li(p,αd)p reaction were measured in coplanar geometry with the α-particle detector set at 50° (lab), while the deuteron-detector telescope was moved in steps of 10° from -100 to -50° (lab), and with the α-particle detector set at 30° (lab) and the deuteron-detector telescope at -100 and -80° (lab). The measured coincidence spectra show a prominent p-α final-state interaction corresponding to the ground state of 5Li. No other strong p-α final-state interaction was observed. The coincidence spectra do not exhibit a p-d final-state interaction corresponding to a T=12 resonance in 3He of excitation between 5.5 and 20 MeV.

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