Elastic scattering of 86 MeV9Li and 55 MeV6He on208Pb

Скобелев, Н. К.; Lukyanov, S. M.; Penionzhkevich, Yu. É.; Tretyakova, S.P.; Borcea, C.; Zhuchko, V. E.; Gorshkov, V. A.; Terenetsky, K.O.; Verbitsky, V.P.; Pozdnyakov, Yu. A.

doi:10.1007/bf01283540

Cited by 17 publications

(14 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…No data exist for the scattering of 11 Li near the Coulomb barrier, and even for 9 Li the scattering data are scarce. The cross section of 9 Li on the 208 Pb target was measured at 86 MeV [16], but this energy is three times the Coulomb barrier. Near the Coulomb barrier, the fusion cross section of 9 Li þ 208 Pb was measured at centerof-mass (c.m.)…”

mentioning

confidence: 99%

Do Halo Nuclei Follow Rutherford Elastic Scattering at Energies Below the Barrier? The Case ofLi11

et al. 2012

View full text Add to dashboard Cite

The first measurement of the elastic scattering of the halo nucleus 11 Li and its core 9 Li on 208 Pb at energies near the Coulomb barrier is presented. The 11 Li þ 208 Pb elastic scattering shows a strong reduction with respect to the Rutherford cross section, even at energies well below the barrier and down to very small scattering angles. This drastic change of the elastic differential cross section observed in 11 Li þ 208 Pb is the consequence of the halo structure of 11 Li, as it is not observed in the elastic scattering of its core 9 Li at the same energies. Four-body continuum-discretized coupled-channels calculations, based on a three-body model of the 11 Li projectile, are found to explain the measured angular distributions and confirm that the observed reduction is mainly due to the strong Coulomb coupling to the dipole states in the low-lying continuum of 11 Li. These calculations suggest the presence of a low-lying dipole resonance in 11 Li close to the breakup threshold. One century ago, Rutherford [1] inferred the structure of the atom from the reaction data measured by Geiger and Marsden [2]. Since then, nuclear structure properties have often been deduced from nuclear reaction studies. With the advent of the first accelerated radioactive beams, new nuclear structures were discovered, such as the existence of a halo in some very loosely bound nuclei. In fact, 25 years ago, Hansen and Jonson [3] interpreted the large interaction cross section observed in 11 Li with light targets by Tanihata et al.[4] as due to the high probability of the outermost nucleons to be at large distances from the central core, which they referred to as a halo structure. The halo structure is a threshold phenomenon due to the low binding energy of the last nucleons. Halo nuclei have several features in common, such as a rather compact core, an extended neutron distribution, and very few, if any, excited states.The discovery of halo nuclei brought renewed interest in the modeling of nuclear reactions. This peculiar structure should affect the reaction properties at near-Coulomb barrier energies. Due to their low binding energy, the description of reactions involving halo nuclei should incorporate the coupling into the continuum. Current approaches to reaction theory involve different approximations whose validity needs to be checked when applied to halo nuclei.The most neutron-rich bound lithium isotope, 11 Li, is a fascinating case. Predicted to be unbound, it was identified in 1966 [5] and it is the archetype of a Borromean halo nucleus; i.e., the two different binary subsystems, 9 Li-n and n-n, are unbound, whereas the three-body system is bound by S 2n ¼ 369:15 AE 0:65 keV [6]. The ground state density distribution of 11 Li extends well beyond its core; i.e., the rms matter radius for the 9 Li isotope is 2:44 AE 0:06 fm Due to the loosely bound structure, the neutron halo is easily polarizable in the strong electric field of a heavy PRL 109, 262701 (2012) P H Y S I C A L

show abstract

mentioning

confidence: 99%

Do Halo Nuclei Follow Rutherford Elastic Scattering at Energies Below the Barrier? The Case ofLi11

et al. 2012

View full text Add to dashboard Cite

show abstract

“…In this contribution we present the current status of the study of the scattering of the halo nucleus 11 Li and its core 9 Li on 208 Pb at energies around the Coulomb barrier. The most neutron-rich lithium isotope, 11 Li, is an intriguing case.…”

Section: Introductionmentioning

confidence: 99%

“…It is the archetype of a Borromean halo nucleus, i.e. the two different binary subsystems, 9 Li-n and n-n, are unbound. Structurally it is composed of a 9 Li core and two weakly bound neutrons with S 2n =369.15(65) keV [5].…”

Section: Introductionmentioning

confidence: 99%

Scattering of the halo nucleus¹¹Li and its core⁹Li on²⁰⁸Pb at energies around the Coulomb barrier

Borge

Cubero

Fernández‐García

et al. 2012

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The first measurement of the elastic scattering of the halo nucleus 11 Li and its core 9 Li on 208 Pb at energies around the Coulomb barrier is presented. The 11 Li reaction showed a large cross section for the breakup channel, even at energies well below the barrier. The analysis of the 11 Li + 208 Pb scattering data in terms of the continuum-discretized coupledchannel calculations indicates that the effect of the coupling to the breakup channels produces a strong suppression of the elastic cross section at energies above and below the barrier. This effect is mainly due to the strong Coulomb coupling to the dipole states in the low-lying continuum of 11 Li.

show abstract

“…Previously, the cross section of 9 Li on a 0.3 mg·cm EPJ Web of Conferences thick 208 Pb target has been measured at 86 MeV and the results have been compared to different calculations [12]. This energy is high compared with the Coulomb barrier at CM (V B ∼ 30 MeV) for the 9 Li + 208 Pb system.…”

mentioning

confidence: 99%

Scattering of⁹Li on²⁰⁸Pb at energies around the Coulomb barrier

Cubero

Fernández‐García

Lay

et al. 2011

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. In order to study the dynamics of 11 Li and 9 Li beams in a strong electric field at energies around the Coulomb barrier, we measured at the ISACII-TRIUMF Facility the angular distribution of elastic and inelastic scattering of 11 Li+ 208 Pb at 24.2 and 29.7 MeV and 9 Li+ 208 Pb at 24, 29.5 and 33 MeV laboratory energies. We present here the first determination of the angular distribution of the cross section of 9 Li+ 208 Pb. The results are compared with theoretical calculations using the double-folding São Paulo Potential (SPP) for the real part and for the imaginary part a Woods-Saxon potential. A good overall agreement is obtained.

show abstract

Elastic scattering of 86 MeV9Li and 55 MeV6He on208Pb

Cited by 17 publications

References 11 publications

Do Halo Nuclei Follow Rutherford Elastic Scattering at Energies Below the Barrier? The Case ofLi11

Do Halo Nuclei Follow Rutherford Elastic Scattering at Energies Below the Barrier? The Case ofLi11

Scattering of the halo nucleus¹¹Li and its core⁹Li on²⁰⁸Pb at energies around the Coulomb barrier

Scattering of⁹Li on²⁰⁸Pb at energies around the Coulomb barrier

Contact Info

Product

Resources

About

Elastic scattering of 86 MeV9Li and 55 MeV6He on208Pb

Cited by 17 publications

References 11 publications

Do Halo Nuclei Follow Rutherford Elastic Scattering at Energies Below the Barrier? The Case ofLi11

Do Halo Nuclei Follow Rutherford Elastic Scattering at Energies Below the Barrier? The Case ofLi11

Scattering of the halo nucleus11Li and its core9Li on208Pb at energies around the Coulomb barrier

Scattering of9Li on208Pb at energies around the Coulomb barrier

Contact Info

Product

Resources

About

Scattering of the halo nucleus¹¹Li and its core⁹Li on²⁰⁸Pb at energies around the Coulomb barrier

Scattering of⁹Li on²⁰⁸Pb at energies around the Coulomb barrier