Isoscalar response of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Ni</mml:mi><mml:mprescripts/><mml:none/><mml:mn>68</mml:mn></mml:mmultiscripts></mml:math>to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math>-particle and deuteron probes

Vandebrouck, M.; Gibelin, J.; Khan, E.; Achouri, N. L.; Baba, H.; Beaumel, D.; Blumenfeld, Y.; Caamaño, M.; Cáceres, L.; Colò, G.; Delaunay, F.; Fernández–Domínguez, B.; Garg, U.; Grinyer, G. F.; Harakeh, Mohsen; Kalantar‐Nayestanaki, N.; Keeley, N.; Mittig, W.; Pancin, J.; Raabe, R.; Roger, T.; Roussel‐Chomaz, P.; Savajols, H.; Sorlin, O.; Stödel, C.; Suzuki, D.; Thomas, J. C.

doi:10.1103/physrevc.92.024316

Cited by 31 publications

(37 citation statements)

References 42 publications

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“…As an example, the Hoyle state, which has a spatially developed 3α cluster structure, is excited with a large isoscalar monopole strength of B(E0; I S) = 121 ± 9 fm 4 [20,23]. This strength is about three times greater than the single-particle limit of the isoscalar monopole strength in 12 C [24]. For 24 Mg, several 0 + states are strongly excited by isoscalar monopole transitions in inelastic α scattering as reported in Ref.…”

Section: Introductionmentioning

confidence: 60%

“…However, the DWBA calculation using the density-independent αN interaction reasonably well describes all the transitions with ΔL = 0-4. We examined uncertainties in the present DWBA calculation stemming from the macroscopic transition densities, distorting potentials, phenomenological αN interaction, and coupled channel effects in 12 C. It was found that the DWBA calculation is not sensitive to details of the transition densities nor the distorting potentials, and the phenomenological density-independent αN interaction gives reasonable results. The coupled-channel effects are negligibly small for the 2 + 1 and 3 − 1 states in 12 C, but not for the 0 + 2 state.…”

Section: (Received 16 October 2017; Published 3 January 2018)mentioning

confidence: 99%

“…However, a contradictory result to the linear proportional relation was reported in the monopole excitation to the Hoyle state from the ground state in 12 C. The isoscalar monopole strength determined from the inelastic electron scattering exhausts about 15% of the energy-weighted sum-rule (EWSR) strength [24,30], but that from the inelastic α scattering exhausts as small as 7.6% [27]. This discrepancy is called the missing monopole strength of the Hoyle state.…”

Section: Introductionmentioning

confidence: 95%

“…These analyses gave the nuclear incompressibility of the symmetric nuclear matter [3,6,8]. Recently, inelastic α scattering off unstable nuclei becomes feasible [11,12] because ISGMRs in unstable nuclei are of special interest in nuclear physics to examine the nuclear incompressibility of the asymmetric nuclear matter.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the missing 2 + 2 state in 12 C was found by the MDA of the 12 C(α,α ) reaction at E α = 386 MeV for the first time [13]. This 2 + 2 state was incontrovertibly predicted by the 3α cluster model as an excited state of the 0 + 2 state (the Hoyle state) [14][15][16], but no experimental attempt to search for this state had been successful for a long time [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Systematic analysis of inelastic α scattering off self-conjugate A=4n nuclei

Adachi¹,

Kawabata

Minomo

et al. 2018

Phys. Rev. C

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We systematically measured the differential cross sections of inelastic α scattering off self-conjugate A = 4n nuclei at two incident energies E α = 130 MeV and 386 MeV at Research Center for Nuclear Physics, Osaka University. The measured cross sections were analyzed by the distorted-wave Born-approximation (DWBA) calculation using the single-folding potentials, which are obtained by folding macroscopic transition densities with the phenomenological αN interaction. The DWBA calculation with the density-dependent αN interaction systematically overestimates the cross sections for the ΔL = 0 transitions. However, the DWBA calculation using the density-independent αN interaction reasonably well describes all the transitions with ΔL = 0-4. We examined uncertainties in the present DWBA calculation stemming from the macroscopic transition densities, distorting potentials, phenomenological αN interaction, and coupled channel effects in 12 C. It was found that the DWBA calculation is not sensitive to details of the transition densities nor the distorting potentials, and the phenomenological density-independent αN interaction gives reasonable results. The coupled-channel effects are negligibly small for the 2 + 1 and 3 − 1 states in 12 C, but not for the 0 + 2 state. However, the DWBA calculation using the density-independent interaction at E α = 386 MeV is still reasonable even for the 0 + 2 state. We concluded that the macroscopic DWBA calculations using the density-independent interaction are reliably applicable to the analysis of inelastic α scattering at E α ∼ 100 MeV/u.

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