Extension of the ratio method to low energy

Colomer, F.; Capel, Pierre; Nunes, F. M.; Johnson, Ronald C.

doi:10.1103/physrevc.93.054621

Cited by 7 publications

(55 citation statements)

References 38 publications

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“…However, as seen in Ref. [17], we find that the agreement with the REB is improved when the role of the Coulomb interaction is reduced. This suggests that a direct comparison of an experimentally measured ratio with the REB form factor would be best performed on light targets.…”

Section: Discussionsupporting

confidence: 78%

“…Similarly to what has been observed at low energies for one-neutron halo nuclei [13,14,17], the ratio is independent of the choice of optical potential used to simulate the interaction between the core of the nucleus and the target. This in itself is very valuable since this interaction is usually poorly known and induces biases in the analysis of reaction data.…”

Section: Discussionsupporting

confidence: 57%

“…However, the results obtained are less good than for the one-neutron halo nuclei studied in Refs. [13,14,17]; we observe that even for nuclei with a valence proton loosely bound in an s or p orbital, the DEA ratio exhibits remnant oscillations. Nevertheless it still follows closely the form factor predicted by the REB.…”

Section: Discussionmentioning

confidence: 72%

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Extension of the ratio method to proton-rich nuclei

Yun

Colomer

Pang

et al. 2019

J. Phys. G: Nucl. Part. Phys.

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Background: The ratio method has been developed to improve the study of one-neutron halo nuclei through reactions. By taking the ratio of angular distributions for two processes, viz. breakup and elastic scattering, this new observable is nearly independent of the reaction mechanism and hence much more sensitive to the projectile structure than the cross sections for each single process.Purpose: We study the extension of the ratio method to proton-rich nuclei. We also explore the optimum experimental conditions for measuring this new observable. Method:We compare accurate dynamical calculations of reactions for proton-rich projectiles to the prediction of the ratio method. We use the dynamical eikonal approximation that provides good results for this kind of reactions at intermediate energy.Results: Our tests for 8 B, an archetypical one-proton halo nucleus, on Pb, Ni, and C targets at 44 MeV/nucleon show that the method can be extended to proton-rich nuclei. The sensitivity of the ratio observable to the singleparticle structure of the projectile is studied in detail. The method is not affected if energy ranges-or bins-are considered in the projectile continuum. This makes the ratio easier to measure experimentally by increasing the breakup cross section. Light elements provide the optimal targets to exploit this observable in practice. We also extend our analysis to 17 F, 25 Al, and 27 P, whose study is of interest to both nuclear astrophysics and nuclear structure.Conclusions: We show that, albeit less precise than for one-neutron halo nuclei, the ratio method can be extended to proton-rich nuclei and that it provides valuable information about their structure. It is especially accurate for nuclei with a valence proton loosely bound in an s or p orbital, i.e. for one-proton halo nuclei.

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Section: Discussionsupporting

confidence: 78%

Section: Discussionsupporting

confidence: 57%

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Extension of the ratio method to proton-rich nuclei

Yun

Colomer

Pang

et al. 2019

J. Phys. G: Nucl. Part. Phys.

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“…The calculations have been performed with Fresco [38], using the same model space and numerical conditions as in Ref. [34].…”

Section: Discussionmentioning

confidence: 99%

Analysis of corrections to the eikonal approximation

Hebborn

Capel

2017

Phys. Rev. C

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Various corrections to the eikonal approximations are studied for two-and three-body nuclear collisions with the goal to extend the range of validity of this approximation to beam energies of 10 MeV/nucleon. Wallace's correction does not improve much the elastic-scattering cross sections obtained at the usual eikonal approximation. On the contrary, a semiclassical approximation that substitutes the impact parameter by a complex distance of closest approach computed with the projectile-target optical potential efficiently corrects the eikonal approximation. This opens the possibility to analyze data measured down to 10 MeV/nucleon within eikonal-like reaction models.

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“…We compare the various theoretical descriptions and explore the dependence of our results on the core-target interaction. Our study demonstrates that the ratio method is still valid at these lower beam energies [3]. This opens up the way to its experimental use in ISOL-type laboratories.…”

Section: Introductionmentioning

confidence: 78%

Extension of the ratio method to low energy

Colomer¹,

Capel²,

Nunes³

et al. 2016

Proceedings of 54th International Winter Meeting on Nuclear Physics — PoS(BORMIO2016)

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Abstract.The ratio method is a recent observable that has been proposed for the study of halo nuclei [1]. It consists of the ratio of breakup angular distribution and the summed angular distribution (which includes elastic, inelastic and breakup) and removes the reaction model dependence. Originally, this method was developed for high and intermediate energies and studies of the reactions of 11 Be halo nucleus on 12 C and 208 Pb targets at 70 MeV/u have shown this observable to provide precise information about the halo structure [2]. Given the potential interest in applying this method at lower energy, we explore its validity at beam energies of 20 MeV/u in this work. We use the Continuum Discretized Coupled Channel method and the Coulomb-corrected Dynamical Eikonal Approximation for the study of the reactions of 11 Be on 12 C, 40 Ca and 208 Pb at 20MeV/u. We compare the various theoretical descriptions and explore the dependence of our results on the core-target interaction. Our study demonstrates that the ratio method is still valid at these lower beam energies [3]. This opens up the way to its experimental use in ISOL-type laboratories.

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Extension of the ratio method to low energy

Cited by 7 publications

References 38 publications

Extension of the ratio method to proton-rich nuclei

Extension of the ratio method to proton-rich nuclei

Analysis of corrections to the eikonal approximation

Extension of the ratio method to low energy

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