Soft Dipole Resonance in 11Li

Kanungo, R.; Tanihata, I.; Samanta, C.

doi:10.1143/ptp.102.1133

Cited by 10 publications

(17 citation statements)

References 18 publications

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“…The values of parameters n, C l , C u , a, b, d are given in Table 1. These constants are found to reproduce the bulk properties of nuclear matter and of finite nuclei [11,12] and are known also to explain the p + 4,6,8 He, 6,7,9,11 Li scattering data successfully [2,4,[13][14][15][16]. The parameters are determined without exchange effects and thus they contain the effect indirectly though in a very approximate way.…”

Section: Theoretical Formulationmentioning

confidence: 94%

Folding model analysis of proton scattering from mirror nuclei 18Ne and 18O

Gupta

Basu

2005

Nuclear Physics A

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The elastic and inelastic scattering of protons from mirror nuclei 18 Ne and 18 O are studied in a folding model approach. For comparison, two different effective interactions are folded with Hartree-Fock densities to obtain the nuclear interaction potentials. Both of them provide equivalent descriptions to the data and the deformation parameters extracted from inelastic scattering are reasonable. The density dependence parameters obtained from nuclear matter calculations and used for present analysis also provide a good estimate for the nuclear mean free path. The present formalism unifies radioactivity, nuclear matter and nuclear scattering.

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Section: Theoretical Formulationmentioning

confidence: 94%

Folding model analysis of proton scattering from mirror nuclei 18Ne and 18O

Gupta

Basu

2005

Nuclear Physics A

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“…For the one-neutron halo nuclei 11 Be [9,12] and 19 C [11], the observed dipole strength at very low excitation energies was interpreted as a quantum-mechanical threshold effect, involving nonresonant transitions of the valence neutron into the continuum [3,13]. For the nuclei 6 He and 11 Li, a coherent dipole vibration of the two halo neutrons against the core was discussed as well [14][15][16][17][18]. The appearance of a collective soft-dipole resonance in general was predicted for heavier neutron-rich systems [19,20], located at excitation energies below the giant dipole resonance (GDR) [19].…”

Section: (Received 19 December 2000)mentioning

confidence: 99%

“…In a first attempt to study giant resonances and lower lying modes in exotic nuclei, we investigated systematically the dipole strength distributions of all neutron-rich oxygen isotopes up to 22 O. 16 O is a strongly bound doubly magic nucleus. For the heavier isotopes, one may expect a decoupling of the valence neutrons from the inert 16 O core.…”

Section: (Received 19 December 2000)mentioning

confidence: 99%

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Photoneutron Cross Sections for Unstable Neutron-Rich Oxygen Isotopes

et al. 2001

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The dipole response of stable and unstable neutron-rich oxygen nuclei of masses A = 17 to A = 22 has been investigated experimentally utilizing electromagnetic excitation in heavy-ion collisions at beam energies about 600 MeV/nucleon. A kinematically complete measurement of the neutron decay channel in inelastic scattering of the secondary beam projectiles from a Pb target was performed. Differential electromagnetic excitation cross sections d sigma/dE were derived up to 30 MeV excitation energy. In contrast to stable nuclei, the deduced dipole strength distribution appears to be strongly fragmented and systematically exhibits a considerable fraction of low-lying strength.

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“…A resonance due to the 'shakeoff' mechanism cannot appear in such pion induced reactions. In a microscopic framework we showed (figure 1) that this low-lying dipole resonance in ½½ Li arises due to a collective oscillation between the core and the halo neutrons giving rise to an 'isovector' SDR mode [11,12]. The controversy on the existence of the resonance state at 1.3 MeV mainly arose as the…”

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confidence: 95%

Physics with loosely bound nuclei

Samanta

2001

Pramana - J Phys

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The essential aspect of contemporary physics is to understand properties of nucleonic matter that constitutes the world around us. Over the years research in nuclear physics has provided strong guidance in understanding the basic principles of nuclear interactions. But, the scenario of nuclear physics changed drastically as the new generation of accelerators started providing more and more rare isotopes, which are away from the line of stability. These weakly bound nuclei are found to exhibit new forms of nuclear matter and unprecedented exotic behaviour. The low breakup thresholds of these rare nuclei are posing new challenges to both theory and experiments. Fortunately, nature has provided a few loosely bound stable nuclei that have been studied thoroughly for decades. Attempts are being made to find a consistent picture for the unstable nuclei starting from their stable counterparts. Some significant differences in the structure and reaction mechanisms are found.In last few decades, with the advent of more and more powerful accelerators, the world has witnessed an explosion of information on nuclei and it has created considerable influence on our day to day life. Nevertheless, complete understanding of the fundamental nucleonnucleon interaction has not been achieved yet. Exactly when it was felt that nuclear physics has possibly reached its saturation, a drastic change in scenario occurred in 1985 with the discovery of a loosely bound isotope of lithium, called ½½ Li. Lithium has two stable isotopes, Li and Li. With the addition of extra neutrons, the neutron-rich isotopes of Li go away from the line of stability and, finally reach the neutron drip line where the oneneutron separation energy´Ë Ò µ becomes zero. While most of the proton drip line´Ë Ô ¼ µ nuclei have been found, the neutron drip line has been reached for low nuclei only. The nuclei near the drip lines are found to delineate many properties that can not be explained by the conventional nuclear physics.The first surprising deviation from the conventional nuclear physics was noticed through measurement of the interaction cross section, which led to the discovery of the anomalously large radius of the ½½ Li nucleus and its exotic shape, called 'halo' [1]. Since then, several such nuclei have been discovered with exotic shape, size and internal structure. While the ½½ Li nucleus has a Li-core plus two neutron-halo, the ½½ Be has only one neutron halo. Recently, in ½¾ Be, a very elongated 'dimmer' configuration has been found at higher excitation energies. Another important discovery is the neutron-skin formation in the He nucleus although it has only a few nucleons [2]. Such a skin was not found even in the 519

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Soft Dipole Resonance in 11Li

Cited by 10 publications

References 18 publications

Folding model analysis of proton scattering from mirror nuclei 18Ne and 18O

Folding model analysis of proton scattering from mirror nuclei 18Ne and 18O

Photoneutron Cross Sections for Unstable Neutron-Rich Oxygen Isotopes

Physics with loosely bound nuclei

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