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Different models for conserved two-and three-body electromagnetic currents are constructed from two-and three-nucleon interactions, using either meson-exchange mechanisms or minimal substitution in the momentum dependence of these interactions. The connection between these two different schemes is elucidated. A number of low-energy electronuclear observables, including (i) np radiative capture at thermal neutron energies and deuteron photodisintegration at low energies, (ii) nd and pd radiative capture reactions, and (iii) isoscalar and isovector magnetic form factors of 3 H and 3 He, are calculated in order to make a comparative study of these models for the current operator. The realistic Argonne v18 two-nucleon and Urbana IX or Tucson-Melbourne three-nucleon interactions are taken as a case study. For A=3 processes, the bound and continuum wave functions, both below and above deuteron breakup threshold, are obtained with the correlated hyperspherical-harmonics method. Three-body currents give small but significant contributions to some of the polarization observables in the 2 H(p, γ) 3 He process and the 2 H(n, γ) 3 H cross section at thermal neutron energies. It is shown that the use of a current which did not exactly satisfy current conservation with the two-and three-nucleon interactions in the Hamiltonian was responsible for some of the discrepancies reported in previous studies between the experimental and theoretical polarization observables in pd radiative capture.

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“…The differential cross sections dσ/dt were measured at low momentum transfer and analyzed within a Glauber multiple scattering model, using phenomenological density distributions, with parameters obtained from the fit to the experimental data. The results obtained for the matter radii of 6,8 He, 8,9,11 Li are summarized in Table 1. The latest results correspond to 12,14 Be and will be published soon.…”

Section: Elastic Scatteringmentioning

confidence: 99%

“…The latest results correspond to 12,14 Be and will be published soon. [9,10]. However, electron scattering experiments for short lived nuclei require the development of new techniques.…”

Section: Elastic Scatteringmentioning

confidence: 99%

“…Many new results were obtained in the last few years: for the light neutron rich isotopes of He and/or Li, the latest results were obtained at GSI by knock out reactions of 8 He, 11 Li and 14 Be beams on a proton target [21,22,23] and at GANIL by transfer reactions induced by the ISOL 8 He beam produced with SPIRAL [24,25]. We shall focus here on 9 He, a system for which the experimental situation is still not completely clear. The first experiments, where 9 He was produced by (π + ,π -), ( 13 C, 13 O), ( 14 C, 14 O) double charge exchange, reported a ground state at 1.3 MeV above the 8 He+n threshold [26,27].…”

Section: Transfer and Knockout Reactionsmentioning

confidence: 99%

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Reactions with exotic nuclei: recent results and challenges

Roussel‐Chomaz

2011

J. Phys.: Conf. Ser.

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Abstract. The interaction of exotic nuclei with various targets and implying different types of reactions allows to access a rich variety of information. Some examples of the latest results and recent developments related to some of these reactions are reviewed. IntroductionWith the availability of secondary beams of relatively good optical qualities and intensities, and thanks to the construction of sophisticated experimental equipment, it is now possible to perform experiments where the secondary beams interact with a target, and to study the different reactions, which come into play. Reactions with exotic beams are mainly used to study the structure of exotic nuclei. This is specifically the case of the so-called direct reactions, namely elastic and inelastic scattering, transfer and knock-out reactions. This is presently the main focus of experiments related to reactions with exotic nuclei, and the present review will illustrate some of the many subjects that can be addressed in this domain.Direct reactions with exotic beams are usually performed in inverse kinematics, by using light targets with simple structure such as proton, deuterons, or alpha. The structure information on the nucleus of interest are extracted either via the missing mass method from the kinematical characteristics (angle and energy) of the light recoil nucleus, or via the invariant mass method where the fragments from the ejectile are measured in order to reconstruct their relative energy spectrum.We shall review in the following the different types of direct reactions and the latest results obtained especially for the light neutron rich nuclei. Reactions mechanisms with exotic beams and their specificities are also a subject, which will be briefly addressed.

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Measurement of the Anomalous Neutron OrbitalgFactor inOs190m

Cited by 22 publications

References 11 publications

Zemach moments ofHe3andHe4

Zemach moments ofHe3andHe4

Electromagnetic structure of A=2 and 3 nuclei and the nuclear current operator

Reactions with exotic nuclei: recent results and challenges

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