One-Neutron Halo of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>19</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>C

Bazin, D.; Brown, B. A.; Brown, J.; Fauerbach, M.; Hellström, M.; Hirzebruch, S. E.; Kelley, J. H.; Kryger, R. A.; Morrissey, D. J.; Pfaff, R.; Powell, C. F.; Sherrill, B. M.; Thoennessen, M.

doi:10.1103/physrevlett.74.3569

Cited by 148 publications

(175 citation statements)

References 26 publications

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“…11 Be is a good example of a binary, 10 Be 1 n, single neutron halo nucleus and 19 C is also a single neutron halo candidate [8]. Both systems have small m y ͞m c ratios.…”

Section: -9007͞97͞79(15)͞2771(4)$1000mentioning

confidence: 99%

Elastic Scattering of Halo Nuclei

1997

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We show that under certain conditions a simple relationship exists between the elastic scattering of a composite halo nucleus and of its core from a stable target. The coupling of the elastic and projectile excitation channels is crucial to the analysis, which is particularly useful when the ratio of the halo to the core mass is small. In the case of 11 Be elastic scattering the cross section relationship is quite well satisfied. For both 11 Be and 19 C our analysis reveals a significant sensitivity of elastic scattering data to the halo size and structure. [S0031-9007(97)03995-1] PACS numbers: 25.60. Bx, 25.70.Bc The existence of a class of light nuclei with a localized central core surrounded by a dilute "halo" of neutron matter is now well established. Evidence for these novel structures has been gained mainly from measurements of total neutron removal [1] and breakup reaction cross sections [2][3][4], particularly at high energy. We investigate to what extent complementary information can be gained from high quality elastic scattering measurements at lower energies.In this Letter we show that, in certain circumstances, the elastic scattering of a halo nucleus from a stable target can give simple direct evidence for the structure of the halo. The theory makes explicit use of the characteristics of halo nuclei, namely their very small neutron separation energy and the large spatial extension of the halo, which in turn result in strong coupling between the halo ground state and low energy excitations. This coupling of the elastic and projectile excitation channels plays a crucial role in the analysis, the results of which cannot be readily understood in terms of optical or folding model approaches. In elastic scattering, the analysis is expected to be particularly useful in systems where the ratio of the halo particle mass to the core mass is small.We consider the scattering of an assumed two-body projectile nucleus, composed of a core of mass m c and a valence particle of mass m y , by a third (target) nucleus of mass m T . It is assumed that these three bodies are spinless and structureless, although these are not essential assumptions. Two key conditions must be met, however, for the subsequent development to be a useful one:(i) The interaction between the core and target (V cT ) should be effectively much stronger than that between the valence and target particles (V yT ).(ii) The relative motion of the core and valence particles is slow compared to the relative motion of the center of mass of the projectile and target, and so can be treated adiabatically, in the spirit to the work of Johnson and Soper [5].Requirement (i) places limitations on the likely regions of applicability of our model. In strong interactiondominated processes, it is likely to be most valid when the number of nucleons in the core far exceeds that of the valence body. For 11 Be elastic scattering, where this ratio is 10:1, the assumption will be seen to be a good starting point for small scattering angles. Requirement (i) could also...

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“…11 Be is a good example of a binary, 10 Be 1 n, single neutron halo nucleus and 19 C is also a single neutron halo candidate [8]. Both systems have small m y ͞m c ratios.…”

Section: -9007͞97͞79(15)͞2771(4)$1000mentioning

confidence: 99%

Elastic Scattering of Halo Nuclei

1997

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“…The Riken data, when compared with semiclassical calculations [8], support a dominant 1s 1/2 configuration of 19 C halo wavefunction. The MSU data [2], on the other hand, suggest an s−wave neutron around the 2 + excited state of 18 C. Recent theoretical calculations on the Coulomb breakup of 19 C [9] indicate the possibility of an s−wave neutron coupled to the 2 + excited state of 18 C, or a d−wave neutron, or a coherent superposition of these two configurations as far as the recent Ganil data [7] are concerned. The total one-neutron removal cross sections in the Coulomb dissociation of 19 C on heavy targets have been calculated in [9].…”

Section: Introductionmentioning

confidence: 99%

“…The total one-neutron removal cross sections in the Coulomb dissociation of 19 C on heavy targets have been calculated in [9]. These cross sections, when compared with experimental data one-neutron removal cross sections measured at Ganil [7] and MSU [2], show that the configuration of a 1s 1/2 neutron coupled to the 0 + 18 C core has non-significant contribution to the ground state structure of 19 C [9]. In view of all these discrepancies, it has not been possible to draw any definite conclusion on the structure of 19 C.…”

Section: Introductionmentioning

confidence: 99%

“…The neutron rich 19 C nucleus, the last particle-stable odd-neutron isotope of carbon, has drawn much attention recently as candidate for having a one-neutron halo structure [2]- [9]. This can be easily anticipated due to its very small neutron binding energy (of the order of a few hundred keV ).…”

Section: Introductionmentioning

confidence: 99%

“…In order to probe the structure of 19 C, only a few experiments on the dissociation of this nucleus have been carried out so far [2], [4], [6]- [8]. Very recently the relative energy spectrum of 19 C has been measured in its Coulomb dissociation at 67 M eV /nucleon incident energy on P b target in a kinematically complete experiment at Riken [8].…”

Section: Introductionmentioning

confidence: 99%

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Halo Structure of 19 C via the ( p,d ) Reaction

Gönül

Yılmaz²

2001

Few-Body Systems

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Abstract. We have investigated the heaviest one-neutron halo candidate 19 C nucleus. Few-body model calculations of cross section angular distributions for the 19 C(p, d) 18 C reaction, together with the test calculations carried out for the 17 C(p, d) 16 C reaction, at a low incident energy are presented for different possible halo-neutron configurations. We show that there is a clear distinction between in particular ℓn = 0 and ℓn = 2 halo transfers. The sensitivity of the cross sections to the assumed 19 C single neutron separation energy is discussed.

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Scattering and reactions of halo nuclei

Johnson

2001

An Advanced Course in Modern Nuclear Physics

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One-Neutron Halo of19C

Cited by 148 publications

References 26 publications

Elastic Scattering of Halo Nuclei

Elastic Scattering of Halo Nuclei

Halo Structure of 19 C via the ( p,d ) Reaction

Scattering and reactions of halo nuclei

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