On the photo-disintegration of Li6

Costa, S.; Ferroni, S.; Wataghin, V.; Malvano, R.

doi:10.1016/0031-9163(63)90613-9

Cited by 33 publications

(11 citation statements)

References 10 publications

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“…In our interpretation, in the low-lying energy regions below the h + t threshold (15.8 MeV), the soft GT-dipole transitions dominate that the out-of-phase transition between the valence nucleons around the α cluster, which is consistent with the interpretation given in Ref. [16] for the lower energy peak. This can be realized as all the spectroscopic factors, S 2 αpn , of the final states in this energy regions are almost unity.…”

Section: Photoabsorption Cross Sectionssupporting

confidence: 92%

“…Let us compare the interpretation given in Refs. [15,16] and our findings. The measured cross sections of Ref.…”

Section: Photoabsorption Cross Sectionssupporting

confidence: 81%

“…In Ref. [16], the lower peak is interpreted as the disintegration to the α + p + n channels, whereas the higher peak is the GDR of 6 Li due to the disintegration of the α core. From the theoretical point of view, it is difficult to say whether this GDR mode is the GDR of the α cluster in 6 Li or not in the high energy regions because identical fermions cannot be distinguished where they belong to.…”

Section: Photoabsorption Cross Sectionsmentioning

confidence: 99%

“…Recently, the photoabsorption reaction cross sections of 6 Li were measured [15] in the energy range up to ∼ 60 MeV, where the E1 transitions are dominant. A twopeak structure in the photoabsorption cross sections was found and the peak at the lower and higher energies were respectively conjectured as the GDR of 6 Li and the GDR of the α cluster in 6 Li based on the idea given in the early study of the 6 Li(γ, n) reaction [16] for the interpretation of the higher peak. If this interpretation is true, these kinds of subnuclear excitation modes may appear in various nuclear systems where the α-cluster structure is well developed.…”

Section: Introductionmentioning

confidence: 99%

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Emergence of nuclear clustering in electric-dipole excitations ofLi6

Satsuka

Horiuchi

2019

Phys. Rev. C

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Nuclear clustering plays an important role, especially in the dynamics of light nuclei. The importance of the emergence of the nuclear clustering was discussed in the recent measurement of the photoabsorption cross sections as it offered the possibility of the coexistence of various excitation modes which are closely related to the nuclear clustering. To understand the excitation mechanism, we study the electric-dipole (E1) responses of 6 Li with a fully microscopic six-body calculation. The ground-state wave function is accurately described with a superposition of correlated Gaussian (CG) functions with the aid of the stochastic variational method. The final-state wave functions are also expressed by a number of the CG functions including important configurations to describe the six-body continuum states excited by the E1 field. We found that the out-of-phase transitions occur due to the oscillations of the valence nucleons against the 4 He cluster at the low energies around 10 MeV indicating "soft" giant-dipole-resonance(GDR)-type excitations, which are very unique in the 6 Li system but could be found in other nuclear systems. At the high energies beyond ∼ 30 MeV typical GDR-type transitions occur. The 3 He-3 H clustering plays an important role to the GDR phenomena in the intermediate energy regions around 20 MeV.

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Section: Photoabsorption Cross Sectionssupporting

confidence: 92%

“…Let us compare the interpretation given in Refs. [15,16] and our findings. The measured cross sections of Ref.…”

Section: Photoabsorption Cross Sectionssupporting

confidence: 81%

Section: Photoabsorption Cross Sectionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Emergence of nuclear clustering in electric-dipole excitations ofLi6

Satsuka

Horiuchi

2019

Phys. Rev. C

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“…The peak around 31 MeV indicates of contribution from an α cluster inside6 Li and while the one around 41 MeV could stem from the deuteron-like contribution inside6 Li. The block dots with error bar, violet inverted triangles, green squares and blue triangles are various experimental data from Yamagata et al[38], Bazhanov et al[68], Costa et al[69], and Wurtz et al[70], respectively.…”

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confidence: 99%

Dipole excitation of $^6$Li and $^9$Be studied with an extended quantum molecular dynamics model

Huang,

2021

Preprint

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The α ( 4 He) -clustering structure is a common phenomenon in light nuclei due to the decreasing contribution of mean field in few-body system. In this work we presented calculations of giant dipole resonance (GDR) excitations for two non α-conjugate light nuclei, namely 6 Li and 9 Be, within a framework of an extended quantum molecular dynamics model. For 6 Li, we investigated the GDR spectra from the two-body clustering structure with α + deuteron as well as the threebody structure with α + n + p, and found that the major α-clustering contribution on the GDR peak is located at around 31 MeV, while the resonance contributions between clusters, namely α and deuteron or (n + p), are located on the lower energy side, which can be regarded as pygmy dipole resonance (PDR). For 9 Be, a mixture configuration contribution for the Chain-like structure and Borromean-like structure of the α + n + α configuration can somehow explain its GDR results.

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The photodisintegration of6Li and7Li

et al. 1979

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The photodisintegration of the stable Lithium isotopes has been investigated by spectroscopy of the emitted charged particles using the Giessen bremsstrahlung facility. Protons, deuterons, tritons, 3He and alpha particles were detected and identified up to 20MeV particle energy. Angular distributions were measured using 7-ray energies up to E~. = 50 MeV. They are compared with theoretical predictions and with other experiments. A remarkable low (7, t)-cross section was found for both isotopes in disagreement to previous measurements using virtual photons. Coincidence measurements between the emitted particles were performed in order to study the manybody-breakups of 7Li.

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On the photo-disintegration of Li6

Cited by 33 publications

References 10 publications

Emergence of nuclear clustering in electric-dipole excitations ofLi6

Emergence of nuclear clustering in electric-dipole excitations ofLi6

Dipole excitation of $^6$Li and $^9$Be studied with an extended quantum molecular dynamics model

The photodisintegration of6Li and7Li

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