Energy levels of light nuclei A = 16-17

We present an interpretation of oscillations in the energy autocorrelation functions for 12 C1 24 Mg scattering assuming that the scattering process can be treated in terms of formation and decay of a dinucleus with strongly overlapping resonances. It is shown that these oscillations can be interpreted in terms of a slow spin decoherence and time-space localization of a coherently rotating hyperdeformed intermediate system. This coherent rotation allows us to reconstruct the time evolution of the long-lived intermediate dinucleus back into the past as far as the moment of its formation. Our analysis indicates that for spin values .20‐ 25\ and at .50 MeV excitation energy hyperdeformation ~3:1! of 36 Ar terminates and is replaced by ~2:1! deformation. New ex

Coherently rotating hyperdeformed quasimolecules in 12 C1 24 Mg scattering

The orbiting cluster model is applied to the basic presently available data on resonances in heavy-ion-induced reactions. The model is shown to correctly predict the presence of resonances and give a good overall agreement with the measured resonance energies.

Persistent success of the orbiting cluster model of heavy-ion resonances

Elastic excitation functions have been measured for the 14C+16O colliding system at incident energies from 38-54 MeV in energy steps of 1 MeV. Evidence was found for resonances at Ecm=18.2, 19.1, 22.9 and 23.8 MeV, to which a Legendre polynomial analysis allowed the assignment of L=11, 13, 17 and (15) respectively. The data were compared to model predictions: good agreement was found with the group theoretical approach to resonances and, equivalently, with the anharmonic vibrator-rotator model.

https://iopscience.iop.org/article/10.1088/0954-3899/16/10/015/pdf

Search for resonances in the 14C+16O reaction

The Airy structure in ${}^{16}\mathrm{O}+{}^{14}\mathrm{C}$ rainbow scattering is studied with an extended double-folding (EDF) model that describes all the diagonal and off-diagonal coupling potentials derived from the microscopic realistic wave functions for ${}^{16}\mathrm{O}$ by using a density-dependent nucleon-nucleon force. The experimental angular distributions at ${E}_{L}=132$, 281, and 382.2 MeV are well reproduced by the calculations. By studying the energy evolution of the Airy structure, the Airy minimum around $\ensuremath{\theta}={76}^{\ensuremath{\circ}}$ in the angular distribution at ${E}_{L}=132$ MeV is assigned as the second-order Airy minimum $A2$ in contrast to the recent literature which assigns it as the third order $A3$. The Airy minima in the ${90}^{\ensuremath{\circ}}$ excitation function is investigated in comparison with well-known ${}^{16}\mathrm{O}+{}^{16}\mathrm{O}$ and ${}^{12}\mathrm{C}+{}^{12}\mathrm{C}$ systems. Evolution of the Airy structure into the molecular resonances with the ${}^{16}\mathrm{O}+{}^{14}\mathrm{C}$ cluster structure in the low-energy region around ${E}_{\mathrm{c}.\mathrm{m}.}=30$ MeV is discussed. It is predicted theoretically for the first time for a non-$4N\phantom{\rule{0.16em}{0ex}}^{16}\mathrm{O}+{}^{14}\mathrm{C}$ system that Airy elephants in the ${90}^{\ensuremath{\circ}}$ excitation function are present.

Airy structure in $^{16}$O +$^{14}$C nuclear rainbow scattering

Elastic and inelastic excitation functions have been measured for the32S+24Mg colliding system at incident energies from 110 to 137 MeV. Evidence has been found for a broad resonance (Γc.m.⋍2 MeV) atEinc=130 MeV, in both the elastic and the inelastic channels. The excitation energy of this resonance in the composite system56Ni corresponds very well to that observed in the28Si+28Si reaction.

Resonances in the32S+24Mg reaction

In a search for possible resonant behavior in medium and heavy composite systems, the 46Ti(58Ni, 58Ni)46Ti elastic scattering was studied in the 58Ni incident energy range from 216.2 to 240 MeV. A kinematic coincidence technique employing position sensitive silicon detectors was used to obtain the mass identification of the binary events. Evidence was found for two structures of non-statistical nature in the elastic excitation function at, respectively, incident 58Ni energies of 223.9 and 227.4 MeV (Ecm=99.0 and 100.6 MeV). A statistical analysis of the corresponding angular distributions disclosed periodical behavior analogous to that caused by single partial waves of J=(36 ± 1) and (47 ± 1), respectively.

ELASTIC SCATTERING OF 58Ni ON 46Ti AT ENERGIES NEAR THE COULOMB BARRIER: SEARCH FOR RESONANT STATES

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Search for resonances in the 14C+16O reaction

Resonances in the32S+24Mg reaction

ELASTIC SCATTERING OF 58Ni ON 46Ti AT ENERGIES NEAR THE COULOMB BARRIER: SEARCH FOR RESONANT STATES