Multi-ħω shell model analyses of elastic and inelastic proton scattering fromN14and

Signatures of Medium Effects on NN Interactions in Proton Scattering from Nuclei

“…Recall that the effective interaction has been used to define the optical potentials (initial and final channels) in these DWA calculations and we stress again that no arbitrary scaling has been used nor have the bound state wave functions been adjusted seeking better fits to data. Similarly good results have been found with a number of other transitions in 12 C, not only at 200 MeV but also for energies up to 800 MeV [9].…”

“…The spectrum and OBDME for 6,7,9,11 Li, 12 C, 14 N and 16 O have been calculated using the code OXBASH [8] and a standard MK3W force [9]. The spectrum of 12 C so obtained up to 20 MeV excitation energy has been displayed and discussed in some detail [10].…”

Very low-energy nucleon-O16coupled-channel scattering: Results with a phenomenological vibrational model

“…Nevertheless, the spectrum they obtained was reasonable and confirmed the Brown and Green result. An extension of that shell model calculation to include negative parity states [14] also found reasonable agreement for the states in the spectrum. While the single particle basis assumed was complete for the (0 + 2 + 4) ω space for the calculation of the positive parity states, there was one restriction in the calculation of the negative parity states, which was done in the same single particle basis.…”

“…With this in mind, it is instructive to compare the extreme shell-model picture, with one particle in the (0d1s)-shell, or the more general (0 + 2) ω model, to the collective model description contained in the MCAS theory [7], which describes low-energy nucleon-nucleus scattering, and the spectrum of the compound system (both bound-states and resonances). However, it is well known that the description of the spectrum of 16 O requires a 4 ω shell model at the minimum [12][13][14]. We discuss aspects of both the 2 ω and 4 ω shell-model results for 16 O to frame discussion of the 2 ω results we have been able to obtain, so far, for the mass-17 systems.…”

Coupling to two target-state bands in the study of then+Ne22system at low energy

“…Often the latter models require a significant polarisation charge to give a match to measured B(E2) rates and electron scattering form factors, for example, while some studies using larger space structures do not [18,19]. Nevertheless we next present results obtained using a 0 ω model (only the 1d − 2s-shell active with the USD interaction of Brown and Wildenthal [23]) to illustrate that the 2 quantities are defined by the (doubly reduced) matrices for ∆T = 0, namely…”