Invariant-mass spectroscopy of ${}^{18}$Ne, ${}^{16}$O, and ${}^{10}$C excited states formed in neutron transfer reactions

Abstract

Neutron transfer reactions with fast secondary beams of ${}^{17}$Ne, ${}^{15}$O, and ${}^9$C have been studied with the HiRA and CAESAR arrays. Excited states of ${}^{18}$Ne, ${}^{16}$O, and ${}^{10}$C in the continuum have been identified using invariant-mass spectroscopy. The best experimental resolution of these states is achieved by selecting events where the decay fragments are emitted transverse to the beam direction. We have confirmed a number of spin assignments made in previous works for the negative-parity states of ${}^{18}$Ne. In addition we have found new higher-lying excited states in ${}^{16}$O and ${}^{18}$Ne, some of which fission into two ground-state ${}^8$Be fragments. Finally for ${}^{10}$C, a new excited state was observed. These transfer reactions were found to leave the remnant of the ${}^9$Be target nuclei at very high excitation energies and maybe associated with the pickup of a deeply-bound ${}^9$Be neutron.

21 pages, 18 figures

References in corpus (6)

• Systematics of intermediate-energy single-nucleon removal cross sections
• Investigations of three, four, and five-particle exit channels of levels in light nuclei created using a 9C beam
• The observation of long-range three-body Coloumb effects in the decay of 16Ne
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Cited by in corpus (5)

• Invariant-mass spectroscopy of ${}^{14}$O excited states
• Unstable states in dissociation of relativistic nuclei. Recent findings and prospects of researches
• Prospects of searching for unstable nucleus states in relativistic nuclear fragmentation
• Using spin alignment of inelastically-excited fast beams to make spin assignments: the spectroscopy of 13O as a test case
• The ${}^8$Be nucleus and the Hoyle state in dissociation of relativistic nuclei