Structure studies of unstable nuclei by electron scattering

Suda, T.; Wakasugi, M.

doi:10.1016/j.ppnp.2005.01.008

Cited by 61 publications

(61 citation statements)

References 22 publications

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“…For this purpose, a new generation of electron-RIB colliders using storage rings is under construction at RIKEN (Japan) [13,16] and at GSI (Germany) [17,18]. It is expected that * xavier.roca.maza@mi.infn.it in the near future the Self-Confining Radioactive Nuclei Ion Target (SCRIT) project in Japan [19][20][21] and the electron-ion scattering in the storage ring (ELISe) experiment at FAIR in Germany [22,23] will offer the opportunity to study the structure of unstable exotic nuclei by means of electron scattering.…”

Section: Introductionmentioning

confidence: 99%

Electron scattering in isotonic chains as a probe of the proton shell structure of unstable nuclei

et al. 2013

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Electron scattering on unstable nuclei is planned in future facilities of the GSI and RIKEN upgrades. Motivated by this fact, we study theoretical predictions for elastic electron scattering in the N = 82, N = 50, and N = 14 isotonic chains from very proton-deficient to very proton-rich isotones. We compute the scattering observables by performing Dirac partial-wave calculations. The charge density of the nucleus is obtained with a covariant nuclear mean-field model that accounts for the low-energy electromagnetic structure of the nucleon. For the discussion of the dependence of scattering observables at low-momentum transfer on the gross properties of the charge density, we fit Helm model distributions to the self-consistent mean-field densities. We find that the changes shown by the electric charge form factor along each isotonic chain are strongly correlated with the underlying proton shell structure of the isotones. We conclude that elastic electron scattering experiments on isotones can provide valuable information about the filling order and occupation of the single-particle levels of protons.

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Section: Introductionmentioning

confidence: 99%

Electron scattering in isotonic chains as a probe of the proton shell structure of unstable nuclei

et al. 2013

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“…In particular, it has allowed the accumulation of much reliable information on charge density distributions of stable nuclei. Therefore, it is believed that the new facilities in GSI [4,5] and RIKEN [6] will provide a good opportunity to study the charge density, and consequently the proton density distribution, of unstable nuclei by elastic electron scattering. Unfortunately, a measurement of the neutron density distributions to a precision and detail comparable to that of the proton one is hardly possible.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, a measurement of the neutron density distributions to a precision and detail comparable to that of the proton one is hardly possible. The nuclear matter distribution in 6 He and 8 He has been determined recently at GSI by using small angle proton scattering in inverse kinematics at relativistic energy [7], and data have also been collected for 11 Li. It turned out that to get information on the neutron skin thickness one needs data obtained with probes having different sensitivities to the proton and neutron distributions.…”

Section: Introductionmentioning

confidence: 99%

Nuclear skin emergence in Skyrme deformed Hartree-Fock calculations

et al. 2007

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A study of the charge and matter densities and the corresponding rms radii for even-even isotopes of Ni, Kr, and Sn has been performed in the framework of the deformed self-consistent mean-field Skyrme HF+BCS method. The resulting charge radii and neutron skin thicknesses of these nuclei are compared with available experimental data, as well as with other theoretical predictions. The formation of a neutron skin, which manifests itself in an excess of neutrons at distances greater than the radius of the proton distribution, is analyzed in terms of various definitions. Formation of a proton skin is shown to be unlikely. The effects of deformation on the neutron skins in even-even deformed nuclei far from the stability line are discussed.

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“…We note, however, that the electron-ion scattering experiment will be available in the near future, as planned in Refs. [1,2]. Isotope shift measurement allows us to precisely deduce the charge (proton) radius for some limited unstable nuclei.…”

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confidence: 99%

Parameter-free calculation of charge-changing cross sections at high energy

Suzuki¹,

Horiuchi²,

Terashima³

et al. 2016

Phys. Rev. C

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Charge-changing cross sections at high energies are expected to provide useful information on nuclear charge radii. No reliable theory to calculate the cross section has yet been available. We develop a formula using Glauber and eikonal approximations and test its validity with recent new data on carbon isotopes measured at around 900A MeV. We first confirm that our theory reproduces the cross sections of 12,13,14 C + 12 C consistently with the known charge radii. Next we show that the cross sections of 12−19 C on a proton target are all well reproduced provided the role of neutrons is accounted for. We also discuss the energy dependence of the charge-changing cross sections. DOI: 10.1103/PhysRevC.94.011602 A study of unstable nuclei is one of the fields that have been promoted most intensively. Charge distribution or charge radius, among others, is one of the fundamental quantities to characterize the ground-state properties of nuclei. Electron scattering measurement is ideal for probing the distribution but so far not applicable to short-lived unstable nuclei. We note, however, that the electron-ion scattering experiment will be available in the near future, as planned in Refs. [1,2]. Isotope shift measurement allows us to precisely deduce the charge (proton) radius for some limited unstable nuclei. The measurement of the charge-changing cross section (CCCS) newly appears as a potential means to extract the proton radius since it has the great advantage that the cross section can be measured for almost all nuclei by the same setup as the total reaction or interaction cross section that plays a decisive role in determining the nuclear matter radius [3]. In fact the CCCS has recently been measured to get information on the proton radii of light unstable nuclei [4][5][6][7][8].A theoretical tool for extracting the matter radius from the high-energy total reaction cross sections is well established with the help of Glauber theory [9]. See Refs. [10,11] for a useful application to determining both proton and neutron radii. The reaction mechanism for the charge-changing reaction (CCR) is, however, not well understood and energydependent adjustments are introduced to analyze the CCCS data [4][5][6]12], which makes it difficult to obtain proton radii from the measurement. The purpose of this paper is to show * Present address: Department of Physics, Niigata University, Niigata 950-2181, Japan.that recent new CCCS data of carbon isotopes on both 12 C [13] and proton targets are all satisfactorily reproduced in the framework of the Glauber and eikonal models. The role of neutrons becomes evident for the proton target. This is an important step toward constructing a method of analyzing CCCSs with the use of no adjustable parameters.The total reaction cross section can be calculated bywhere b is a two-dimensional (2D) impact parameter vector perpendicular to the beam (z) direction, |0 = |0 P 0 T is a product of the projectile and target ground-state wave functions, and, e.g., χ p is a sum of the phase-shift functions χ...

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Structure studies of unstable nuclei by electron scattering

Cited by 61 publications

References 22 publications

Electron scattering in isotonic chains as a probe of the proton shell structure of unstable nuclei

Electron scattering in isotonic chains as a probe of the proton shell structure of unstable nuclei

Nuclear skin emergence in Skyrme deformed Hartree-Fock calculations

Parameter-free calculation of charge-changing cross sections at high energy

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