William A. Peters

Area of research

Nuclear and High Energy Physics · Radiation

Research interest

Research topics from publications: First Observation of Ground State Dineutron Decay:Be16; First observation of the13Li ground state; Determining the7Li(n,γ) cross section via Coulomb dissociation of8Li; Spyrouet al.Replies:; Structure and decay correlations of two-neutron systems beyond the dripline; Exploring the neutron dripline two neutrons at a time: The first observations of the26O and16Be ground state resonances. Representative work: We report on the first observation of dineutron emission in the decay of 16Be. A single-proton knockout reaction from a 53 MeV/u 17B beam was used to populate the ground state of 16Be. 16Be is bound with respect to the emission of one neutron and unbound to two-neutron emission. The dineutron character of the decay is evidenced by a small emission angle between the two neutrons. The two-neutron separation energy of 16Be was measured to be 1.35(10) MeV, in good agreement with shell model calculations, using standard interactions for this mass region The ground state of neutron-rich unbound ${}^{13}$Li was observed for the first time in a one-proton removal reaction from ${}^{14}$Be at a beam energy of 53.6 MeV/u. The ${}^{13}$Li ground state was reconstructed from ${}^{11}$Li and two neutrons giving a resonance energy of 120${}_{\ensuremath{-}80}^{+60}$ keV. All events involving single- and double-neutron interactions in the Modular Neutron Array (MoNA) were analyzed, simulated, and fitted self-consistently. The three-body (${}^{11}\text{Li}+n+n$) correlations within Jacobi coordinates showed strong dineutron characteristics. The decay energy spectrum of the intermediate ${}^{12}$Li system (${}^{11}\text{Li}+n$) was described with an $s

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