The SCRIT electron scattering facility project at RIKEN RI beam factory

Ohnishi, T.; Enokizono, A.; Hara, Masahiro; Hori, T.; Ichikawa, Shinichi; Kurita, K.; Matsuo, Saki; Suda, T.; Tamae, T.; Togasaki, Mamoru; Tsukada, K.; Tsuru, Takeshi Go; Wang, S; Yoneyama, S.; Wakasugi, M.

doi:10.1088/0031-8949/2015/t166/014071

Cited by 17 publications

(11 citation statements)

References 21 publications

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“…Elastic electron (and muon) scattering off nuclei is a model independent technique to investigate the size and shape of stable nuclei [159,16,160] and unstable nuclei [161,162,163]. This is because electrons interact via the electroweak interaction with the nucleons.…”

Section: Proton Density Distributionsmentioning

confidence: 99%

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Nuclear equation of state from ground and collective excited state properties of nuclei

Roca-Maza

Paar

2018

Progress in Particle and Nuclear Physics

188

110

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This contribution reviews the present status on the available constraints to the nuclear equation of state (EoS) around saturation density from nuclear structure calculations on ground and collective excited state properties of atomic nuclei. It concentrates on predictions based on self-consistent mean-field calculations, which can be considered as an approximate realization of an exact energy density functional (EDF). EDFs are derived from effective interactions commonly fitted to nuclear masses, charge radii and, in many cases, also to pseudo-data such as nuclear matter properties. Although in a model dependent way, EDFs constitute nowadays a unique tool to reliably and consistently access bulk ground state and collective excited state properties of atomic nuclei along the nuclear chart as well as the EoS. For comparison, some emphasis is also given to the results obtained with the so called ab initio approaches that aim at describing the nuclear EoS based on interactions fitted to few-body data only. Bridging the existent gap between these two frameworks will be essential since it may allow to improve our understanding on the diverse phenomenology observed in nuclei. Examples on observations from astrophysical objects and processes sensitive to the nuclear EoS are also briefly discussed. As the main conclusion, the isospin dependence of the nuclear EoS around saturation density and, to a lesser extent, the nuclear matter incompressibility remain to be accurately determined. Experimental and theoretical efforts in finding and measuring observables specially sensitive to the EoS properties are of paramount importance, not only for low-energy nuclear physics but also for nuclear astrophysics applications. 7 The expression introduced by Migdal in Ref. [43] neglected the term in a AS . 8 From a macroscopic picture it would correspond to an isotropic compression. 9 From a macroscopic picture it would correspond to a non-isotropic compression. 15

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Section: Proton Density Distributionsmentioning

confidence: 99%

“…Both quantities together are essential to properly reproduce the experimental charge rms radius. Theoretical studies on elastic electron scattering by exotic nuclei [164,165,166,167,163] have recently been fostered by projects such as SCRIT [161] or ELISe [162].…”

Section: Proton Density Distributionsmentioning

confidence: 99%

Nuclear equation of state from ground and collective excited state properties of nuclei

Roca-Maza

Paar

2018

Progress in Particle and Nuclear Physics

188

110

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“…This work demonstrates that the SCRIT technique enables up to perform electron scattering experiment for determination of nuclear charge density distribution even for small amount of isotopes provided by conventional ISOL system. RI production for experiments on unstable nuclei has already started [25]. Electron scattering off short-lived unstable nuclei will be realized in the near future.…”

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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“…This experiment verifies that the SCRIT technique enables us to perform electron scattering and extract the nuclear charge density distribution even for the small amount of isotopes provided by a conventional isotope separation on line system. Radioactive isotope production for experiments on unstable nuclei has already started [22] and electron scattering from short-lived unstable nuclei will be realized in the near future.…”

Section: Discussionmentioning

confidence: 99%

First Result from the SCRIT Electron Scattering Facility with ¹³²Xe Target

Tsukada

Adachi

Enokizono

et al. 2021

Proceedings of 10th International Conference on Nuclear Physics at Storage Rings (STORI’17)

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The SCRIT (Self-Confining Radioactive-Isotope Ion Target) electron scattering facility has been constructed with the aim of realizing electron scattering experiments for unstable nuclei, which have not yet been performed. Electron scattering is known to be one of the most powerful and reliable method to investigate the internal structure of atomic nuclei; this was demonstrated for many stable nuclei in the latter half of the 20th century. Therefore, the realization of electron scattering for unstable nuclei has been long awaited. Recently, a series of elastic electron scattering experiments on a stable nucleus ( 132 Xe) target was performed at the SCRIT electron scattering facility. A luminosity of about 10 27 cm −2 s −1 could be achieved with only 10 8 target ions/pulse. By comparing the obtained data with a phase shift calculation, information about the charge density distribution of the 132 Xe nucleus can be extracted and the obtained root-mean-square radius is consistent with that deduced from X-ray measurements of muonic atoms.

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The SCRIT electron scattering facility project at RIKEN RI beam factory

Cited by 17 publications

References 21 publications

Nuclear equation of state from ground and collective excited state properties of nuclei

Nuclear equation of state from ground and collective excited state properties of nuclei

First Elastic Electron Scattering from Xe132 at the SCRIT Facility

First Result from the SCRIT Electron Scattering Facility with ¹³²Xe Target

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The SCRIT electron scattering facility project at RIKEN RI beam factory

Cited by 17 publications

References 21 publications

Nuclear equation of state from ground and collective excited state properties of nuclei

Nuclear equation of state from ground and collective excited state properties of nuclei

First Elastic Electron Scattering from Xe132 at the SCRIT Facility

First Result from the SCRIT Electron Scattering Facility with 132Xe Target

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Product

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First Result from the SCRIT Electron Scattering Facility with ¹³²Xe Target