Inelastic Electron Scattering From Nuclei

Heisenberg, J.; Blok, H.P.

doi:10.1146/annurev.ns.33.120183.003033

Cited by 163 publications

(100 citation statements)

References 21 publications

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“…The experimental data are expected to be contaminated with inelastic scattering processes corresponding to some excited states (e.g., 2 + , excitation energies are 0.67 MeV, 1.3 MeV and higher), because the momentum resolution of our spectrometer is insufficient for separating these states from the ground state. Theoretical calculations with a distorted wave Born approximation code FOUBES [23,24] using a transition density distribution [22] indicate that below 1.2 fm −1 and at 1.4 fm −1 , the first excited state contributes below 1% and 10% of the ground-state contribution, respectively. These contributions are much smaller than the statistical errors.…”

Section: Momentum [Mev/c]mentioning

confidence: 99%

First Elastic Electron Scattering from Xe132 at the SCRIT Facility

et al. 2017

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The first elastic electron scattering has been successfully performed at the self-confining RI ion target (SCRIT) facility, the world's first electron scattering facility for exotic nuclei. The SCRIT technique achieved high luminosity (over 10 27 cm −2 s −1 , sufficient for determining the nuclear shape) with only 10 8 target ions. While 132 Xe used in this time as a target is stable isotope, the charge density distribution was firstly extracted from the momentum transfer distributions of the scattered electrons by comparing the results with those calculated by a phase shift calculation.The charge density distribution of the nucleus is one of the most important factors in the nuclear structure investigations, as it directly relates to the superimposition of the squared wave functions of all protons in the nucleus. Following the monumental measurements by R. Hofstadter and his colleagues [1] in the latter half of the 20th century, many stable nuclei have been studied by elastic electron scattering experiments. However, with few exceptions, electron scattering from short-lived unstable nuclei has been precluded by the difficulty in preparing the target material for these nuclei. Realizing electron scattering for unstable nuclei has been long waited, as it has been revealed that some of nuclei far from the stability valley exhibit exotic features such as neutron halo, neutron skin, etc.[2] which are totally unknown in stable nuclei.We have invented an internal target-forming technique called self-confining RI ion target (SCRIT) [3] in an electron storage ring, which three-dimensionally traps the target ions along the electron beam axis. The ions are confined by transverse focusing force given by the electron beam itself and an electrostatic potential well provided by electrodes put along the beam axis. After a successful feasibility study [4,5], we have recently completed the construction of the SCRIT electron scattering facility [6] at RIKEN's RI Beam Factory, which is dedicated to the study of exotic nuclei. The luminosity required for elastic electron scattering (10 27 cm −2 s −1 ) was achieved with only 10 8 target ions as available at an conventional isotope separation on line (ISOL) facility. In traditional electron scattering experiments, the number of target nuclei is typically of the order of 10 20 . This advancement enables electron scattering not only from unstable nuclei, but also from stable nuclei that have not been studied to date.In this Letter, we report the first elastic electron scattering results of 132 Xe nuclei obtained at the SCRIT facility. Although 132 Xe is a stable nucleus, it has never been investigated by electron scattering [7]. Interestingly, stable xenon isotopes have been recently utilized as targets for dark matter searches [8][9][10], and in neutrinoless double beta decay experiments [11]. To calculate the cross sections in these experiments, the form factors of the Xe isotopes are required. However, transition X-ray measurements of muonic atoms have yielded only the rootmean-squa...

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Section: Momentum [Mev/c]mentioning

confidence: 99%

First Elastic Electron Scattering from Xe132 at the SCRIT Facility

et al. 2017

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“…All theoretical calculations in RPA, as in HF, give the same behaviour in the nuclear interior, which indicates a systematic problem of a more fundamental nature (a detailed discussion can be found in refs. [33,34]). …”

Section: Resultsmentioning

confidence: 99%

Effects of the ground state correlations on the structure of vibrational states

Karadjov

Voronov²,

Catara

et al. 1998

Nuclear Physics A

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“…Based on theoretical calculations [19,20], dashed-line in the figure, the amount of the contribution of the first excited state is evaluated to be less than 1 % of that of the ground state below 1.2 fm −1 , and to reach up to 10 % at 1.4 fm −1 . Those influence is, therefore, much smaller than the statistical errors.…”

Section: Pos(inpc2016)007mentioning

confidence: 99%

First Result from Scrit Electron Scattering Facility : Charge Density Distribution Of 132 Xe

Tsukada¹,

Kasama²,

Namba³

et al. 2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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We have constructed the SCRIT electron scattering facility at RIKEN in order to realize electron scattering off unstable nuclei. Because electron scattering is the most powerful and reliable tool to study the internal structure of the atomic nuclei as demonstrated for many stable nuclei in the latter half of the 20th century, actualization of electron scattering for the unstable nuclei has been long awaited. Recently, we have performed a series of elastic electron scattering experiments with 132 Xe target. The high luminosity of around 10 27 cm −2 s −1 which is a minimum-requirement for electron scattering is achieved with using only 10 8 target ions. By comparing with a DWBA calculation assuming the two-parameter Fermi distribution as the nuclear charge density distribution, it is found that a root-mean-square of radius is consistent with that from the measurement of X-ray of muonic atom and an information of surface shape of 132 Xe nucleus is extracted for the first time.

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Inelastic Electron Scattering From Nuclei

Cited by 163 publications

References 21 publications

First Elastic Electron Scattering from Xe132 at the SCRIT Facility

First Elastic Electron Scattering from Xe132 at the SCRIT Facility

Effects of the ground state correlations on the structure of vibrational states

First Result from Scrit Electron Scattering Facility : Charge Density Distribution Of 132 Xe

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