Fusion and breakup at the barrier with 11Be

Yoshida, Akihiro; Signorini, C.; Fukuda, T.; Watanabe, Yutaka; Aoi, N.; Hirai, M.; Ishihara, M.; Kobinata, H.; Mizoi, Y.; Mueller, Leonard J.; Nagashima, Y.; Nakano, Junzo; Nomura, T.; Pu, Yunfei; Scarlassara, F.

doi:10.1016/s0370-2693(96)01327-5

Cited by 82 publications

(85 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their motivation to carry out a new analysis was the fact that the results and conclusions from the previous two papers in refs. [132,133] were different. The cause of difference was the detection efficiency within the time windows considered in these papers, which used the time of flight of the beams to determine the incident energy on an event by event basis.…”

Section: 12mentioning

confidence: 99%

“…This experiment was reviewed in [2]. The data were obtained in two different runs and were reported in two papers [132,133]. In the second paper, a new analysis of the first run was presented.…”

Section: 12mentioning

confidence: 99%

“…Depending on the time windows considered, different contributions were obtained from 215,216 Fr following 4n and 3n evaporation in the case of 10 Be projectile. Using the empirical systematics from the cross section for the 9 Be + 209 Bi system [132,135,136], the efficiency could be accounted for. The relative yields for the xn channels from complete fusion, the correct absolute normalization, and the fission contribution to the complete fusion cross section could then be deduced.…”

Section: 12mentioning

confidence: 99%

See 2 more Smart Citations

Elastic scattering, fusion, and breakup of light exotic nuclei

2016

View full text Add to dashboard Cite

Abstract. The present status of fusion reactions involving light (A < 20) radioactive projectiles at energies around the Coulomb barrier (E < 10 MeV per nucleon) is reviewed, emphasizing measurements made within the last decade. Data on elastic scattering (providing total reaction cross section information) and breakup channels for the involved systems, demonstrating the relationship between these and the fusion channel, are also reviewed. Similarities and differences in the behavior of fusion and total reaction cross section data concerning halo nuclei, weakly-bound but less exotic projectiles, and strongly-bound systems are discussed. One difference in the behavior of fusion excitation functions near the Coulomb barrier seems to emerge between neutron-halo and proton-halo systems. The role of charge has been investigated by comparing the fusion excitation functions, properly scaled, for different neutron-and proton-rich systems. Possible physical explanations for the observed differences are also reviewed.

show abstract

Section: 12mentioning

confidence: 99%

Section: 12mentioning

confidence: 99%

Section: 12mentioning

confidence: 99%

See 1 more Smart Citation

Elastic scattering, fusion, and breakup of light exotic nuclei

2016

View full text Add to dashboard Cite

show abstract

“…Results show that continuum-continuum couplings enhance the irreversibility of breakup and reduce the flux that penetrates the Coulomb barrier. Converged total fusion cross sections agree with the experimental ones for energies around the Coulomb barrier, but underestimate those for energies well above the Coulomb barrier.Introduction: The existence and the role of the breakup process of weakly bound projectiles in complete fusion and scattering mechanisms have been extensively investigated in recent years both theoretically [1-6] and experimentally [7][8][9][10][11][12][13][14][15][16], but there is not yet any definitive conclusion. There are contradictory theoretical works which predict either the suppression [1][2][3][4] or the enhancement [5] of the complete fusion cross section due to the coupling of the relative motion of the nuclei to the breakup channel.…”

mentioning

confidence: 99%

Effect of continuum couplings in fusion of halo11Beon208Pbaround the Coulomb barr

2002

View full text Add to dashboard Cite

The effect of continuum couplings in the fusion of the halo nucleus 11 Be on 208 Pb around the Coulomb barrier is studied using a three-body model within a coupled discretised continuum channels (CDCC) formalism. We investigate in particular the role of continuum-continuum couplings. These are found to hinder total, complete and incomplete fusion processes. Couplings to the projectile 1p 1/2 bound excited state redistribute the complete and incomplete fusion cross sections, but the total fusion cross section remains nearly constant. Results show that continuum-continuum couplings enhance the irreversibility of breakup and reduce the flux that penetrates the Coulomb barrier. Converged total fusion cross sections agree with the experimental ones for energies around the Coulomb barrier, but underestimate those for energies well above the Coulomb barrier.Introduction: The existence and the role of the breakup process of weakly bound projectiles in complete fusion and scattering mechanisms have been extensively investigated in recent years both theoretically [1-6] and experimentally [7][8][9][10][11][12][13][14][15][16], but there is not yet any definitive conclusion. There are contradictory theoretical works which predict either the suppression [1][2][3][4] or the enhancement [5] of the complete fusion cross section due to the coupling of the relative motion of the nuclei to the breakup channel.Recent coupled channels calculations for 11 Be+ 208 Pb [6] have shown that the coupling of the relative motion to the breakup channel has two effects, depending on the value of the bombarding energy, namely (i) a reduction of the complete fusion cross sections at energies above the Coulomb barrier due to the loss of incident flux, and (ii) an enhancement of the complete fusion cross sections at energies below the Coulomb barrier due to the dynamical renormalisation of the nucleus-nucleus potential. Using the isocentrifugal approximation and an incoming boundary condition inside the barrier, this calculation did not include the effect of the projectile's halo structure on the monopole projectile-target potential. Nor did it include the excitation to partial waves other than p 3/2 in the continuum, or the continuumcontinuum and bound excited states couplings in either reaction partner. Moreover, only a small interval of energy for continuum states (up to 2 MeV) was considered.The couplings between continuum states have been shown to be crucial to understand the breakup of 8 B on a 58 Ni target at low energy E lab = 25.8 MeV [19,20]. Therefore, it could be expected that continuum-continuum couplings significantly affect the role of breakup process in fusion of halo nuclei around the Coulomb barrier. We believe that

show abstract

“…In the last decade, many high-precision measurements of fusion cross sections have been made, and the nuclear structure information has been successfully extracted through the representation of the fusion barrier distribution [1]. Low-energy radioactive beams have also become increasingly available in recent years, and heavy-ion fusion reactions involving neutron-rich nuclei have been performed for a few systems [29][30][31][32][33]. New generation facilities have been under construction at several laboratories, and many more reaction measurements with exotic beams at low energies will be performed in the near future (see Ref.…”

Section: Quasi-elastic Scattering With Radioactive Beamsmentioning

confidence: 99%

Large-angle scattering and quasielastic barrier distributions

2004

View full text Add to dashboard Cite

We study in detail the barrier distributions extracted from large-angle quasi-elastic scattering of heavy ions at energies near the Coulomb barrier. Using a closed-form expression for scattering from a single barrier, we compare the quasi-elastic barrier distribution with the corresponding test function for fusion. We examine the isocentrifugal approximation in coupled-channels calculations of quasi-elastic scattering and find that for backward angles, it works well, justifying the concept of a barrier distribution for scattering processes. This method offers an interesting tool for investigating unstable nuclei. We illustrate this for the 32 Mg + 208 Pb reaction, where the quadrupole collectivity of the neutron-rich 32 Mg remains to be clarified experimentally.

show abstract

Fusion and breakup at the barrier with 11Be

Cited by 82 publications

References 22 publications

Elastic scattering, fusion, and breakup of light exotic nuclei

Elastic scattering, fusion, and breakup of light exotic nuclei

Effect of continuum couplings in fusion of halo11Beon208Pbaround the Coulomb barr

Large-angle scattering and quasielastic barrier distributions

Contact Info

Product

Resources

About