Total cross sections of reactions induced by neutron-rich light nuclei

Saint‐Laurent, M. G.; Anne, R.; Bazin, D.; Guillemaud‐Mueller, D.; Jahnke, U.; Ming, Jin Gen; Mueller, A. C.; Bruandet, J.F.; Glasser, F. P.; Kox, S.; Liatard, E.; Chan, Tsan Ung; Costa, G.; Heitz, Ch.; El-Masri, Y.; Hanappe, F.; Bimbot, R.; Arnold, E.; Neugart, R.

doi:10.1007/bf01292431

Cited by 42 publications

(48 citation statements)

References 25 publications

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“…These data were interpreted by large nuclear-matter radii due to the very low two-neutron separation energy of these isotopes. Nuclei closer to stability, however, were also reported [5][6][7] to display higher cross sections than estimated from systematics established with stable beams. This opens the possibility to probe new aspects of nuclear structure with reaction studies, namely low-density tails in the wave function, which hardly influence the spectrum of excited states.…”

Section: Introductionmentioning

confidence: 86%

“…p (fin) ro. p (fro) r0, p (fro) [7] (this work) [ related to the fact that errors originating from the energy dependence should cancel at least partly, since we use the same procedure for the adjustment of the radii as well as for the determination of the cross sections on the different targets. This argument also holds true, if (2) with r0, t = 1.1 fm does not exactly reproduce the cross sections of the different lithium isotopes on the hydrogen present in the scintillator [27].…”

Section: The Scintillator Targetmentioning

confidence: 98%

“…The values of our experiment are obtained at about 80 MeV/nucleon by analysing the reaction rate for a scintillator target. They are compared to radii extracted from cross sections obtained at 790 MeV/nucleon for a carbon target [2] and to radii calculated from cross sections at about 30 MeV/nucleon for a copper target [7]. We analysed these data in the same way as our data, i.e.…”

Section: The Scintillator Targetmentioning

confidence: 99%

“…Due to this effect and as the errors due to statistical uncertainties are large, it seems to be justified to use the energy dependence of (2). In contrast to the procedure used here, in [7] the reduced nuclear radii squared, rg, are extracted from the cross sections assuming the same reduced nuclear radius for both the exotic projectile and the stable target. With such a parametrization one does not expect consistent r 0 values for one projectile on different targets.…”

Section: The Scintillator Targetmentioning

confidence: 99%

“…Since for light targets the EMD cross-section component is expected to be negligible [ 1,7], we used the measurements with the scintillator targets to estimate the nuclear reactions occurring in the detectors themselves as well as to determine the nuclear part of the interaction cross section for the high-Z targets.…”

Section: The Scintillator Targetmentioning

confidence: 99%

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Reaction cross section measurements of the neutron-rich isotopes8,9,11Li at 80 MeV/nucleon

Blank

Gaimard

Geißel

et al. 1991

Z. Physik A - Hadrons and Nuclei

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Total interaction cross sections have been measured for 8Li on C and Pb targets, for 9Li on C, A1, Cu, Sn and Pb targets as well as for lILi on C, Sn and Pb targets. For each beam, we also used a plastic scintillator as target. The measurements with the scintillator targets are used to extract reduced nuclear radii of the lithium isotopes. These radii are then used for the calculation of the nuclear part of the total cross section for the other targets. The total electromagnetic-dissociation (EMD) cross sections have been deduced and are compared to different models. A strong target-charge-dependent EMD cross section is measured for ~Li reaching 2.96 +0"84"_0.82 b for the Pb target. In the 9Li case, a large EMD cross section for high-Z targets has been observed which amounts to 0.75 __+ 0.45 b for the Pb target. The EMD cross sections of both, 9Li and ~Li, may be understood by the giantdipole-resonance model.

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Section: Introductionmentioning

confidence: 86%

Section: The Scintillator Targetmentioning

confidence: 98%

Section: The Scintillator Targetmentioning

confidence: 99%

Section: The Scintillator Targetmentioning

confidence: 99%

Section: The Scintillator Targetmentioning

confidence: 99%

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Reaction cross section measurements of the neutron-rich isotopes8,9,11Li at 80 MeV/nucleon

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Gaimard

Geißel

et al. 1991

Z. Physik A - Hadrons and Nuclei

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Halo signals in the beta decay of28 O

Poves

Retamosa

Borge

et al. 1994

Z. Physik A - Hadrons and Nuclei

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Abstract, We present a study of the 'hypothetical', doubly magic and extremely neutron-rich nucleus 280. In our description 280 is a bound nucleus and exhibits some of the features of a neutron halo, where a particular channel for beta delayed deuteron emission is evident.PACS: 21.10. Dr; 21.10.Gv; 21.60.Cs; Nuclei at the valley of stability have very similar neutron an proton radii, even in situations (e.g. 48Ca, 2~ of large neutron excess. However, recent experimental data on light nuclei far from stability, where the binding energy of the last one or two nucleons is very small, show the existence of a new structure in which these loosely bound neutrons or protons, depending on which side of the valley of stability, extend themselves far out, forming a halo [1,21. Most of this experimental data comes from the studies of the 2n-halo nuclei 11Li. The main fingerprints seen here are:9 an abnormally large matter radius compared to the charge radius, and consequently large reaction cross sections [3-6]; 9 large cross sections for Coulomb dissociation, especially in the 2 n channel [3-6]; 9 a very narrow momentum distribution in the fragmentation channel [7].There have been recent efforts aiming to understand the peculiar behaviour of some very neutron rich nuclei in a shell model context [8][9][10][11]. These studies have shown that the intruder configurations play a prominent role in the onset of deformation around 31Na. The physical mechanisms behind these shape transitions may be the same as those responsible for the appearance of a neutron halo. In order to explore this hypothesis, we take as a very simple example the extremely neutron rich nucleus 280.* Permanent address: Instituto de Estructura de la Materia, CSIC, Serrano 119, E-28006 Madrid, SpainThe studies of the shape transition around N = 20 far from stability, have shown that the gap between (usually) occupied and (usually) empty configurations is greatly reduced with respect to what happens at stability. From a mean field point of view the situation can be interpreted as the bunching of the bound and (almost) unbound orbits at the top of the well. Among these orbits some may have large radial extension correlated with their quasiunbound nature [12,13]. Therefore, the residual interaction determines what configurations are energetically favoured. When valence protons are available the attractive Q,~. Qv interaction may lead to deformed shapes.The shell model apl~roach to the neutron halo has a serious shortcoming in the difficulty of extracting the structure of the wave function in Configuration Space from the properties of the effective interaction and wave function, defined in Fock Space. In spite of that, it is the natural framework to account for some of the expected features of the neutron halo which depend only implicitely on the radial form of the wave function.In our case study, 280, we shall analyse the following results of the shell model calculations; 9 the structure of the wave function 9 the one and two-neutron separation energies 9 the s...

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