Angular Correlation of Nuclear Radiation

Frauenfelder, Hans

doi:10.1146/annurev.ns.02.120153.001021

Cited by 37 publications

(11 citation statements)

References 73 publications

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“…A full quantum treatment can be found in Refs. [22,23]. The experimental distribution does not follow any of these three possibilities and is quite remarkable having a distinct asymmetry about θ pp =90 • (cos θ pp =0).…”

Section: Distributions Of Relative Angle Between Protonsmentioning

confidence: 88%

Invariant-mass spectroscopy of O14 excited states

et al. 2019

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Excited states in 14 O have been investigated both experimentally and theoretically. Experimentally, these states were produced via neutron-knockout reactions with a fast 15 O beam and the invariant-mass technique was employed to isolate the 1p and 2p decay channels and determine their branching ratios. The spectrum of excited states was also calculated with the Shell Model Embedded in the Continuum that treats bound and scattering states in a unified model. By comparing energies, widths and decay branching patterns, spin and parity assignments for all experimentally observed levels below 8 MeV are made. This includes the location of the second 2 + state that we find is in near degeneracy with the third 0 + state. An interesting case of sequential 2p decay through a pair of degenerate 13 N excited states with opposite parities was found where the interference between the two sequential decay pathways produces an unusual relative-angle distribution between the emitted protons.

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Section: Distributions Of Relative Angle Between Protonsmentioning

confidence: 88%

Invariant-mass spectroscopy of O14 excited states

et al. 2019

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“…→ p + 8 Be g.s. decay axes gives some information on the spins of these levels [18,19]. The experimental angular correlation for the 5.22-MeV state is shown as the data points in all panels of Fig.…”

Section: Correlations For Sequential Two-proton Decaymentioning

confidence: 99%

Continuum spectroscopy with aC10beam: Cluster structure and three-body decay

et al. 2009

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Resonance-decay spectroscopy is used to study particle-unbound excited states produced in interactions of E/A = 10.7 MeV 10 C on Be and C targets. After inelastic scattering, structures associated with excited states in 10 C were observed at 5. 22, 5.29, 6.55, 6.56, 6.57, and 8.4 MeV which decay into the 2p + 2α final state. This final state is created via a number of different decay paths, which include prompt and sequential two-proton decay to the ground state of 8 Be, α decay to 6 Be g.s. , and proton decay to the 2.345-MeV state of 9 B. For the sequential two-proton decay states (5.22 and 6.55 MeV), angular correlations between the first two decay axes indicate that the spin of these states are nonzero. For the prompt two-proton decay of the 5.29-MeV state, the three-body correlations between the two protons and the core are intermediate between those measured for ground-state 6 Be and 45 Fe decays. The 6.55-and 6.57-MeV structures are most probably associated with the same level, which has a 14% two-proton decay branch with a strong "diproton" character and a 86% sequential two-proton decay branch. Correlations between the fragments following the three-body decay of the 2.345-MeV state of 9 B can be approximately described by sequential α decay to the 5 Li intermediate state. The 8.06-and 9.61-MeV 10 B states that decay into the d + 6 Li 2.186 channel are confirmed. Evidence for cluster structure in 13 N is obtained from a number of excited states that decay into the p + 3α exit channel.

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“…[20,21], we have used the Monte Carlo simulations to include the detector response. The detector bias is generally minor.…”

Section: B 8 Be Decaymentioning

confidence: 99%

Investigation of particle-unbound excited states in light nuclei with resonance-decay spectroscopy using aBe12beam

et al. 2008

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Resonance-decay spectroscopy is used to study particle-unbound excited states produced in interactions of E/A = 50 MeV 12 Be on polyethylene and carbon targets. The particle-unbound states are produced in a variety of reaction mechanisms, ranging from projectile fragmentation to proton pickup. New proton-decaying excited states are observed in 9 Li(E * = 14.1 ± 0.1 MeV, = 207 ± 49 keV) and 10 Be(E * = 20.4 ± 0.1 MeV, = 182 ± 74 keV). In addition a new α-decaying state is observed in 13 B(E * = 13.6 ± 0.1 MeV, 320 keV). Also found was a 8 Be state with E * = 23 MeV, = 616 ± 30 keV, which decays to the p + 3 H + α channel. Correlation between the fragments indicates that the decay is initiated by a proton emission to the 4.63-MeV state of 7 Li and the spin of the state is J > 2. A second T = 2 state was confirmed in 12 B at 14.82 MeV, which decays to the p + 11 Be, 3 H + 9 Be, and α + 8 Li channels. Its width was found to be 100 keV and its spin is consistent with J π = 2 + .

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Angular Correlation of Nuclear Radiation

Cited by 37 publications

References 73 publications

Invariant-mass spectroscopy of O14 excited states

Invariant-mass spectroscopy of O14 excited states

Continuum spectroscopy with aC10beam: Cluster structure and three-body decay

Investigation of particle-unbound excited states in light nuclei with resonance-decay spectroscopy using aBe12beam

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