First Demonstration of Electron Scattering Using a Novel Target Developed for Short-Lived Nuclei

Suda, T.; Wakasugi, M.; Emoto, Takashi; Ishii, K.; Ito, S.; Kurita, K.; Kuwajima, A.; Noda, Akira; Shirai, Tomoyuki; Tamae, T.; Tongu, Hiromu; Wang, S.; Yano, Y.

doi:10.1103/physrevlett.102.102501

Cited by 93 publications

(51 citation statements)

References 10 publications

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“…The N = 82 isotones below 132 Sn are believed to be in close relation with the peak of the solar r-process abundance distribution observed around the mass number A = 130 [43,44], whereas the N = 50 isotones near 78 Ni are thought to be responsible for producing the pronounced abundance peak observed around A = 80 [43,45]. On the other hand, scattering data for light nuclei, such as those of N = 14, are likely to be obtained in future electron scattering facilities such as SCRIT [19][20][21] and ELISe [22,23].…”

Section: Introductionmentioning

confidence: 97%

“…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%

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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: 97%

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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“…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.…”

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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 beam size was about 2 mm H ×0.4 mm V in sigma at the center of SCRIT. The number of 132 Xe ions introduced in SCRIT was estimated to be 2.3×10 8 [particles/pulse] [12]. Totally, measurement times were 7.8×10 3 , 1.3×10 5 , and 1.9×10 5 sec for the electron beam energies of 151, 201, and 301 MeV, respectively.…”

Section: Pos(inpc2016)007mentioning

confidence: 99%

“…In this paper, the second method with a completely new and novel target-forming technique, SCRIT (Self-Confining Radioactive Isotope Target) [6], is discussed. The feasibility of SCRIT was already demonstrated with a prototype device [7,8], and following the success of the feasibility study, we completed the SCRIT electron scattering facility dedicated for exotic nuclei in the RI Beam Factory at RIKEN [9].…”

Section: Introductionmentioning

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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First Demonstration of Electron Scattering Using a Novel Target Developed for Short-Lived Nuclei

Cited by 93 publications

References 10 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

First Elastic Electron Scattering from Xe132 at the SCRIT Facility

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

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