Electron-beam-driven RI separator for SCRIT (ERIS) at RIKEN RI beam factory

Ohnishi, T.; Ichikawa, S.; Koizumi, K.; Kurita, K.; Miyashita, Y.; Ogawara, Ryo; Tamaki, Shigeru; Togasaki, Mamoru; Wakasugi, M.

doi:10.1016/j.nimb.2013.07.029

Cited by 22 publications

(9 citation statements)

References 15 publications

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“…The electron beam is then accelerated to the desired energy below 700 MeV if necessary. The Xe ions are produced from natural Xe gas, and accelerated and mass-separated by functions of an electron-beam driven RI separator for SCRIT (ERIS) [14]. Continuous ion beam from the ERIS is converted to pulsed beam with the duration of 370 µs at a fringing-RF-field-activated ion beam compressor (FRAC) [15] and it is delivered to the SCRIT.…”

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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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First Elastic Electron Scattering from Xe132 at the SCRIT Facility

et al. 2017

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“…1. The facility consists of RTM (a 150-MeV racetrack microtron), SR2 (an electron storage ring) equipped with SCRIT, ERIS (an electron-beam driven RI separator for SCRIT) [11], WiSES (a window-frame spectrometer for electron scattering), and LMon (a luminosity monitor).…”

Section: Experimental Apparatusmentioning

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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“…Radioactive isotope (RI) production began in 2013, and an intense RI beam for experiments with short-lived nuclei is under development. [8].…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 shows a schematic layout of the SCRIT electron scattering facility [5]. It consists of a racetrack microtron (RTM), an electron storage ring (SR2), an electron-beam-driven RI separator for SCRIT (ERIS) [8], and a fringing-RF-field-activated ion beam compressor (FRAC) [9]. The SCRIT system is located in the straight section of SR2.…”

Section: Introductionmentioning

confidence: 99%

The Scrit Electron Scattering Facility At Riken RI Beam Factory

Ohnishi

Hara

Hori

et al. 2017

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

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The SCRIT (Self-Confining Radioactive-Isotope Ion Target) electron scattering facility has been constructed at the RIKEN RI Beam Factory. In the commissioning experiment, the ion-trapping properties of the SCRIT system were studied using stable ions. By using an electron spectrometer, the momentum transfer distribution of the electron elastic scattering of 132 Xe was measured at 150, 200, and 300 MeV, and the charge density distribution was deduced. During the measurements, a luminosity of 1.8×10 27 cm −2 s −1 was achieved with a 250-mA electron beam and only 10 8 trapped ions. Production of RIs has begun in an electron-beam-driven RI separator, and developments are underway to increase the production rate of short-lived nuclei. Soon, measurements of electron elastic scattering by short-lived nuclei will be performed.

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Electron-beam-driven RI separator for SCRIT (ERIS) at RIKEN RI beam factory

Cited by 22 publications

References 15 publications

First Elastic Electron Scattering from Xe132 at the SCRIT Facility

First Elastic Electron Scattering from Xe132 at the SCRIT Facility

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

The Scrit Electron Scattering Facility At Riken RI Beam Factory

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