A study of coupled-reaction channel effects in the36S +37Cl system, hybridization between single particle orbits

Oertzen, W. von; Wilpert, Th.; Bilwes, B.; Stuttgé, L.; Ferrero, J.L.; Ruiz, Juan A.C.; Thompson, I. J.; Imanishi, B.

doi:10.1007/bf01285149

Cited by 10 publications

(13 citation statements)

References 16 publications

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“…Other cases will be shown in the discussion of multi-nucleon transfer (figure 46) in section 5.10. Again enhanced multiple pair transfer is observed for a target with an open neutron shell, namely for 124 Sn; the odd-even effect in the yields is here observed for the transfer of up to three neutron pairs. In this case transfer is measured as a pick-up process from the heavy target, with the detection of the lighter fragment.…”

Section: Enhancement Of Two-nucleon Transfermentioning

confidence: 52%

“…Enhancement in this case is again obtained by the coherent action of the wavefunctions contributing to configuration mixing; the increased spatial correlations, however, are due to a unique effect specific for small systems (nuclei)-the mixing of configurations of different parity, hybridization (see in particular [31,86,118,124,167]), which induces a spatial distortion of the radial density distribution, as discussed extensively in physical chemistry. An example of configuration mixing in one-and two-proton transfer has been given by the study of proton transfers with nuclei at the end of the sd shell in [124,167]. Here mixing of sd with fp shells gives a dramatic increase of the two-proton transfer probability in the reaction 40 Ca( 37 Cl, 39 K) 38 Ar-as shown in figure 21.…”

Section: Cases With Configuration Mixingmentioning

confidence: 85%

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Pairing correlations of nucleons and multi-nucleon transfer between heavy nuclei

2001

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This review presents the status of the field of two-nucleon and multi-nucleon transfer reactions induced by heavy ions. The role of the pairing interaction in nuclei as a finite quantum system is illustrated. These reactions serve as a unique tool for the study of the dynamical aspects of pairing correlations in nuclei in particular for the cases of nuclear superfluidity. The new possibilities offered by the development of experimental techniques, e.g. the large gammaray detectors combined with charged particle detectors are presented, which allows the study of the enhanced pair transfer between well selected states, and the problem of the expected quenching of pairing correlation at high spin. Further, the new possibilities offered by the advent of radioactive beam facilities are discussed.

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Section: Enhancement Of Two-nucleon Transfermentioning

confidence: 52%

Section: Cases With Configuration Mixingmentioning

confidence: 85%

Pairing correlations of nucleons and multi-nucleon transfer between heavy nuclei

2001

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“…Some important features can be deduced from an energy diagram, as shown in Fig. 5, which shows the positions of the single particle orbits of the neutron at the two centers, namely for α and 16 17 O . We note that this particular situation is known as the quasi-resonance condition for the sharing of valence particles in molecular science.…”

Section: §3 Reflection Asymmetric Cases: Parity Doublets In 21 Nementioning

confidence: 99%

“…A comparison for one example can be found in Ref. 17). For the stationary cases, particularly for the beryllium case, many authors have dealed with the molecular orbital approach.…”

Section: §1 Introductionmentioning

confidence: 99%

Nuclear Clusters and Covalently Bound Nuclear Molecules

Oertzen

2002

Prog. Theor. Phys. Suppl.

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Light N=Z nuclei show pronounced clustering for exited states close to the decay thresholds. This fact is expressed in the Ikeda-Diagram. In neutron-rich nuclei, low lying states close to the neutron drip-line show also pronounced clustering with α-particles and heavier closed shell clusters. For the valence neutrons a concept based on molecular orbitals can be used for their single particle wave functions. Covalent binding between α-particles due to valence neutrons and a related shallow local potential is now known to be responsible for particular structures in light neutron rich nuclei, like dimers in Be-isotopes, and trimers in C-isotopes. A local potential as between two α-particles can be defined between other clusters, for example between α-particles and 16 O, giving rise to intrinsic reflection asymmetric molecular structures in 21 Ne as parity doublets. An Extended Ikeda Diagram can be constructed based on these concepts with clusters and covalent neutrons. §1. IntroductionWe can look back into 30 years of studies of clustering phenomena in nuclear physics. There has been a steady evolution of the field, with a particularly strong push in recent years due to the study of neutron rich exotic nuclei. The earlier work was focused on light nuclei with N=Z and their reactions, which has been on the forefront of research, in particular due to the observation of the heavy-ion resonances. Many theoretical concepts have been clarified in the last decades, specifically the equivalence of the shell model description with the cluster model approaches, once antisymmetrisation is considered in its full consequence (see also Ref. 1)).The shell model approaches made big progress because they were able to include larger and larger model space. However, the need for cluster models can be illustrated by the fact that the most extensive shell model calculations 2) do not produce the famous second 0 + -state of 12 C. The long standing problem how to define a cluster has been a line of thought all this time. 1) One approach is perfectly illustrated by the diagram 3), 4) proposed by Ikeda in 1968. In Fig. 1 this diagram is shown. The concept suggests that states of a particular cluster-(sub)structure appear close to the threshold for the decay of the composite system into these "fragments". This can actually be observed with rising excitation energy starting from the bound states of normal nuclei, as well as function of decreasing binding, when approaching the dripline. The main physical effect of the diagram resides in the properties of the nucleon-nucleon interaction, which gives rise to saturation and the stabilisation of clusters with particular "magic" numbers, and their mutually reduced interaction.

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“…The core-exchange symmetry and the associated transfer processes show up not only in the elastic scattering but also in the inelastic light HI scattering [2], which is dubbed as the inelastic transfer process. Although several experimental [8][9][10][11][12][13][14][15][16][17][18] and theoretical studies [19][20][21][22] were done to investigate the inelastic nucleon transfer, the inelastic α transfer process was rarely studied so far. The finite-range distorted wave Born approximation (DWBA) and, more recently, coupled reaction channels (CRC) method have been used to explore the impact of the inelastic α transfer on the 16 O+ 12 C [23][24][25], 9 Be+ 13 C [26], 16 O+ 20 Ne, and 14 N+ 10 B scattering at low energies [27].…”

Section: Introductionmentioning

confidence: 99%

Elastic and Inelastic Alpha Transfer in the 16o+12c Scattering

Phuc

Khoa

2021

Comm. in Phys.

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The elastic scattering cross section measured at energies $E\lesssim 10$ MeV/nucleon for some light heavy-ion systems having two identical cores like \oc exhibits an enhanced oscillatory pattern at the backward angles. Such a pattern is known to be due to the transfer of the valence nucleon or cluster between the two identical cores. In particular, the elastic $\alpha$ transfer has been shown to originate directly from the core-exchange symmetry in the elastic \oc scattering. Given the strong transition strength of the $2^+_1$ state of $^{12}$C and its large overlap with the $^{16}$O ground state, it is natural to expect a similar $\alpha$ transfer process (or inelastic $\alpha$ transfer) to take place in the inelastic \oc scattering. The present work provides a realistic coupled channel description of the $\alpha$ transfer in the inelastic \oc scattering at low energies. Based on the results of the 4 coupled reaction-channels calculation, we show a significant contribution of the $\alpha$ transfer to the inelastic \oc scattering cross section at the backward angles. These results suggest that the explicit coupling to the $\alpha$ transfer channels is crucial in the studies of the elastic and inelastic scattering of a nucleus-nucleus system with the core-exchange symmetry.\Keywords{optical potential, coupled reaction channels, inelastic $\alpha$ transfer

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A study of coupled-reaction channel effects in the36S +37Cl system, hybridization between single particle orbits

Cited by 10 publications

References 16 publications

Pairing correlations of nucleons and multi-nucleon transfer between heavy nuclei

Pairing correlations of nucleons and multi-nucleon transfer between heavy nuclei

Nuclear Clusters and Covalently Bound Nuclear Molecules

Elastic and Inelastic Alpha Transfer in the 16o+12c Scattering

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