Relativistic mean field study of clustering in light nuclei

Arumugam, P.; Sharma, B. K.; Patra, S. K.; Gupta, Raj K.

doi:10.1103/physrevc.71.064308

Cited by 70 publications

(88 citation statements)

References 39 publications

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“…Surprisingly, at higher excitation energies clustering get changed drastically in these systems, due to decreasing pairing strength. Figures 3(a) and 6(a) for 20 Ne * system at different T-values, clearly demonstrate the probable binary symmetric cluster configuration with the IMF 10 B (≡2α+p+n) at higher T-value showing the large preformation yield in comparison to at the lower T-values, as observed also in the relativistic mean field calculations for intrinsic excited states of 20 N e [9], and also for the calculations within formalism of energy density functionals which clearly presents the similar kind of results for the 20 N e [10]. Moreover, the IMF 14 N (≡3α+p+n) appear as the most probable cluster followed by IMF / α-clusters 12 C and 16 O which are anyhow most probable at resonant state energies.…”

Section: Calculations and Discussionsupporting

confidence: 50%

“…Two of us (SKP and RKG) have studied [9] the clustering in light, stable and exotic nuclei within the relativistic mean field approach which explains the well established cluster structures in both the ground and intrinsic excited states of these nuclei. In this study, α-clustering and halo structures have also been explored for the 6−14 Be and 11,13,15,17,19 B isotopes, respectively, having α+α+xn structures with α+α as the core and α+α+p+xn structures with α+α+p as the core.…”

Section: Introductionmentioning

confidence: 99%

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Clustering effects and decay analysis of the light-mass N=Z and N≠Z composite systems formed in heavy ion collisions

et al. 2017

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respectively, formed in low energy heavy ion reactions at different excitation energies, within the collective clusterization approach of the dynamical cluster-decay model (DCM) of Gupta and collaborators based on quantum mechanical fragmentation theory (QMFT). Considering quadrupole deformated and compact orientated nuclei, a comparative decay analysis of these systems has been undertaken for the emission of different intermediate mass fragments ( 16 O cluster and non-α cluster 14 C (more so in 22 Ne * N =Z composite system), supported by the Ikeda diagrams, taking into account the proper pairing strength in the temperature dependent liquid drop energies. Within the DCM, we notice that at higher excitation energies in addition to xα (where x is an integer) type clusters from N=Z composite systems and xn-xα type clusters from N =Z composite systems, np-xα type clusters are relatively quite dominant, with larger preformation probability due to the decreased pairing strength at higher temperatures in the liquid drop energies. Also, the study reveals the presence of competing reaction mechanisms of compound nucleus (fusion-fission, FF ) and of noncompound nucleus origin (deep inelastic orbiting, DIO) in the decay of very light mass composite systems 20,21,22 Ne * and 28 Si * at different excitation energies. The DIO contribution in the intermediate mass fragments (IMFs) cross section σIMF s is extracted for these composite systems, σIMF s is given as the sum of FF cross section σF F and DIO cross section σDIO. The DCM calculated FF cross-sections σ DCM F F are in good agreement with the available experimental data.

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Section: Calculations and Discussionsupporting

confidence: 50%

Section: Introductionmentioning

confidence: 99%

Clustering effects and decay analysis of the light-mass N=Z and N≠Z composite systems formed in heavy ion collisions

et al. 2017

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“…This figure represents the microscopic EDF-based analogue of the original Ikeda diagram, which illustrates the coexistence of the nuclear mean-field and various cluster structures that appear close to the (multi) α-separation threshold energies [29]. For instance, already the equilibrium density of 8 Be displays a two-α cluster configuration [44][45][46]. In the case of 12 C, the equilibrium self-consistent mean-field configuration exhibits a slightly oblate triangular distribution of the three α particles (i.e.…”

Section: B Quadrupole and Octupole Deformations And Parity-projectedmentioning

confidence: 99%

“…In the last decade EDFs have also been successfully applied to studies of clustering phenomena, and this framework enables a consistent microscopic analysis of the formation and evolution of cluster structures that is not limited to the lightest nuclei [1][2][3][4][5][6][7][8][9]. To describe the phenomenon of nuclear clustering already in the most basic EDF implementation, the self-consistent mean-field level, it is necessary to break as many spatial symmetries of the nuclear system as possible, and this implies a considerable computational cost.…”

Section: Introductionmentioning

confidence: 99%

Density functional theory studies of cluster states in nuclei

et al. 2014

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The framework of nuclear energy density functionals is applied to a study of the formation and evolution of cluster states in nuclei. The relativistic functional DD-ME2 is used in triaxial and reflection-asymmetric relativistic Hartree-Bogoliubov calculations of relatively light N = Z and neutron-rich nuclei. The role of deformation and degeneracy of single-nucleon states in the formation of clusters is analyzed, and interesting cluster structures are predicted in excited configurations of Be, C, O, Ne, Mg, Si, S, Ar and Ca N = Z nuclei. Cluster phenomena in neutron-rich nuclei are discussed, and it is shown that in neutron-rich Be and C nuclei cluster states occur that are characterized by molecular bonding of α-particles by the excess neutrons.

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“…This type of prescription is already done in Ref. [53]. However, to include continuum effects fully more work has to be done (by use of basis of finite potentials and inclusion of correlation effects in a Hartree-Bogoliubov scheme [54]).…”

Section: Pauli Blocking and Harmonic Oscillator Basismentioning

confidence: 99%

Superdeformed structures and low Ω parity doublet in Ne-S nuclei near neutron drip-line

2014

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Abstract:The structures of Ne, Na, Mg, Al, Si, P and S nuclei near the neutron drip-line region are investigated in the frame-work of relativistic mean field theory and non-relativistic Skyrme Hartree-Fock formalism. The recently discovered nuclei 40 Mg and 42 Al, which are beyond the drip-line predicted by various mass formulae are located within these models. We find many largely deformed neutron-rich nuclei, whose structures are analyzed. From the structure anatomy, we find that at large deformation low Ω orbits of opposite parities (e.g. IntroductionThe structure of light nuclei near the neutron drip-line is an interesting topic for a good number of exotic phenomena. Nuclei in this region are quite different in collectivity and clustering features than their stable counterpart in the nuclear chart. For example, the neutron magic property is lost for N = 8 in 12 Be [1][2][3] and N = 20 in 32 Mg [4]. The unexpectedly large reaction cross-section for 22 C gives an indication of neutron halo structure [5]. The discovery of large collectivity of 34 Mg by Iwasaki et al. [6] is another example of such exotic properties. The deformed structures, core excitation, and the location of the drip-line for * E-mail: shailesh@iopb.res.in Mg and neighboring nuclei are a few of the interesting properties for investigation. In this context, the discovery of 40 Mg and 42 Al, once predicted to be nuclei beyond the drip-line by various mass formulae [7,8], show the need for modification of the mass models.

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Relativistic mean field study of clustering in light nuclei

Cited by 70 publications

References 39 publications

Clustering effects and decay analysis of the light-mass N=Z and N≠Z composite systems formed in heavy ion collisions

Clustering effects and decay analysis of the light-mass N=Z and N≠Z composite systems formed in heavy ion collisions

Density functional theory studies of cluster states in nuclei

Superdeformed structures and low Ω parity doublet in Ne-S nuclei near neutron drip-line

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