Nuclear physics at the SCRIT electron scattering facility

Suda, T.; Adachi, T.; Amagai, Tatsuya; Enokizono, A.; Hara, Masahiro; Hori, T.; Ichikawa, Shinichi; Kurita, K.; Miyamoto, Takaya; Ogawara, Ryo; Ohnishi, T.; Shimakura, Y.; Tamae, T.; Togasaki, Mamoru; Wakasugi, M.; Wang, Shuo; Yanagi, K.

doi:10.1093/ptep/pts043

Cited by 19 publications

(9 citation statements)

References 16 publications

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“…Unfortunately, measurements on nuclei outside the valley of stability have been prevented by the difficulty associated to preparing short-lived targets, despite the interest in studying exotic nuclei presenting features like neutron halo, neutron skins or a proton bubble [4][5][6][7][8]. Such investigations have recently been made possible with the construction of the self-confining radioactive-isotope ion target (SCRIT) at RIKEN [9][10][11], and will be explored as well in the next few years at FAIR by the ELISe project [12]. By succesfully using an electron storage ring as a trap for the radioactive ions, the SCRIT experiment has been able to scatter electrons off 132 Xe nuclei and recently published its first results [11].…”

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confidence: 99%

Ab initio computation of charge densities for Sn and Xe isotopes

Arthuis,

Barbieri,

Vorabbi

et al. 2020

Preprint

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We present the first ab initio calculations for open-shell nuclei past the tin isotopic line, focusing on Xe isotopes as well as doubly-magic Sn isotopes. We show that even for moderately hard interactions, it is possible to obtain meaningful predictions, and that the NNLOsat chiral interaction predicts radii and charge density distributions close to the experiment. We then make a new prediction for 100 Sn. This paves the way for ab initio studies of exotic charge density distributions at the limit of the present ab initio mass domain, where experimental data is becoming available. The present study closes the gap between the largest isotopes reachable by ab initio methods and the smallest exotic nuclei accessible to electron scattering experiments.

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confidence: 99%

Ab initio computation of charge densities for Sn and Xe isotopes

Arthuis,

Barbieri,

Vorabbi

et al. 2020

Preprint

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“…Figure 1 illustrates the SCRIT facility. Details of the facility are described elsewhere [6,13]. The 150 MeV electron beam is injected and accumulated in the storage ring (SR2).…”

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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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“…The idea of SCRIT for scattering experiments with storage electrons and RI ions trapped by electron beams has been experimentally confirmed [101]. Construction of the electron-RI scattering equipment with SCRIT is ongoing [102] (see Fig. 1).…”

Section: Ribf At Present and In The Futurementioning

confidence: 93%

Research with fast radioactive isotope beams at RIKEN

Motobayashi

Sakuraï

2012

Progress of Theoretical and Experimental Physics

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The RIKEN RI Beam Factory (RIBF) provides intense radioactive isotope (RI) beams with energies around 200 MeV/nucleon in a wide range of unstable nuclei. Part of the facility started routine operation in 1987 and, in 1990, RI beams from this part became available, with energies of a few tens of MeV/nucleon and the world's highest intensities at the time for many light exotic nuclei. To exploit the research opportunities available with such fast RI beams, various experimental devices have been constructed and several new methods have been developed. A number of modern aspects of nuclear structure, such as the neutron halo and the disappearance/appearance of magic numbers, have been investigated. Several attempts to approach astrophysical nuclear processes involving short-lived nuclei have been made. The present RIBF facility was completed in 2006. It far exceeds other existing facilities in the world in its RI beam production capability. A variety of research programs have been started, and several groundbreaking results have already been obtained.

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Nuclear physics at the SCRIT electron scattering facility

Cited by 19 publications

References 16 publications

Ab initio computation of charge densities for Sn and Xe isotopes

Ab initio computation of charge densities for Sn and Xe isotopes

First Elastic Electron Scattering from Xe132 at the SCRIT Facility

Research with fast radioactive isotope beams at RIKEN

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