• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Elucidation of the r-process second peak from key nuclear mass measurements at N=82 with the Rare-RI Ring at RIKEN/RIBF

Research Project

Project/Area Number 19K03901
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

NAIMI SARAH  国立研究開発法人理化学研究所, 開拓研究本部, 研究員 (40747135)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywordsnuclear mass / storage ring / r-process / position detector / Mass Measurement / mass measurement / Storage Ring / Position detecto / Nuclear masses / Position detector / Rare-RI Ring
Outline of Research at the Start

Reach the r-process bottleneck by measuring nuclear masses of the most neutron-rich nuclei
Measure 11 new nuclear masses for the first time
Increase Rare-RI Ring efficiency to 10%, making it the most efficient online mass spectrometer for Rare Isotopes in the world
Build the first position-sensitive detector to be used in the Rare-RI Ring

Outline of Final Research Achievements

Mass measurement of rare isotope 123Pd produced at RIBF/ RIKEN was performed with the Rare-RI Ring. The mass of this isotope was used to perform astrophysical calculation to estimate the r-process abundances of mass A=122 and A=123. We find that the abundance ratio of these two masses can be reproduced when using the new mass of 123Pd in the calculation.

We have also finalized the development of a new position-sensitive detector for the Rare-RI Ring. The detector position resolution is similar to that of the RIBF standard detector, with the advantage of being operable under the high-vacuum condition in the Rare-RI Ring.

Academic Significance and Societal Importance of the Research Achievements

Mass measurements of 123Pd was performed to investigate its influence in the r-process synthesis of chemical elements tin and antimony. Such measurement is only possible only at RIBF/RIKEN.
The results of this experiment was published in international journal and a press release was prepared.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (16 results)

All 2022 2021 2020 2019 Other

All Journal Article (9 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 9 results,  Open Access: 5 results) Presentation (6 results) (of which Invited: 3 results) Remarks (1 results)

  • [Journal Article] First Application of Mass Measurements with the Rare-RI Ring Reveals the Solar r-Process Abundance Trend at A=22 and A=1232022

    • Author(s)
      H. F. Li, S. Naimi et al.
    • Journal Title

      Physical Review Letters

      Volume: 128 Issue: 15 Pages: 152701-1

    • DOI

      10.1103/physrevlett.128.152701

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Improved position resolution of the beam diagnostics detector for the Rare-RI Ring2021

    • Author(s)
      G. Hudson-Chang, S. Naimi et al.
    • Journal Title

      RIKEN Accelerator Progress Report

      Volume: 54 Pages: 101-101

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development and operation of a time-of-flight detector to confirm particle storage at the Rare-RI Ring2021

    • Author(s)
      D. Nagae et al.
    • Journal Title

      Nuclear Inst. and Methods in Physics Research, A

      Volume: 986 Pages: 164713-164713

    • DOI

      10.1016/j.nima.2020.164713

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Experimental Challenges of the First Mass Measurement Campaign at the Rare-RI Ring2020

    • Author(s)
      S. Naimi et al.
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 1643 Issue: 1 Pages: 012058-012058

    • DOI

      10.1088/1742-6596/1643/1/012058

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Performance of a none-isochronous position-sensitive detector for the Rare-RI Ring2020

    • Author(s)
      R. Crane, S. Naimi et al.
    • Journal Title

      RIKEN Accelerator Progress Report

      Volume: 53 Pages: 177-177

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Efficiency and timing performance of time-of-flight detector utilizing thin foils and crossed static electric and magnetic fields for mass measurements with Rare-RI Ring facility2020

    • Author(s)
      S. Suzuki, A. Ozawa, D. Kamioka, Y. Abe, M. Amano, H. Arakawa, Z. Ge, K. Hiraishi, Y. Ichikawa, K. Inomata, A. Kitagawa, T. Kobayashi, Hg. Li, T. Matsumoto, T. Moriguchi, M. Mukai, D. Nagae, S. Naimi, S. Omika, S. Sato, Y. Tajiri, K. Wakayama, T. Yamaguchi
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

      Volume: 965 Pages: 163807-163807

    • DOI

      10.1016/j.nima.2020.163807

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Development of a new in-ring beam monitor in the Rare-RI Ring2019

    • Author(s)
      S. Omika, T. Yamaguchi, N. Tadano, Y. Abe, M. Amano, Z. Ge, D. Kamioka, T. Moriguchi, D. Nagae, S. Naimi, A. Ozawa, F. Suzaki, S. Suzuki, T. Suzuki, T. Uesaka, M. Wakasugi, K. Wakayama, Y. Yamaguchi
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

      Volume: 463 Pages: 241-243

    • DOI

      10.1016/j.nimb.2019.05.029

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Mass Measurements with the Rare-RI Ring for the A=130 r-process Abundance Peak2019

    • Author(s)
      S. Naimi et al.
    • Journal Title

      Riken Acceleration Progress Report

      Volume: 52 Pages: 102-102

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Preliminary analysis of mass measurement experiment in the south-western region of 132Sn with Rare RI Ring2019

    • Author(s)
      H.F. Li, S. Naimi et al.
    • Journal Title

      Riken Acceleration Progress Report

      Volume: 52 Pages: 52-52

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Mass measurement with the Rare-RI Ring at RIBF/Riken elucidates r-process abundances of heavy elements at A=122,1232022

    • Author(s)
      S. Naimi
    • Organizer
      TCHoU Workshop (Online)
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Development of a large-area position-sensitive detector for the Rare-RI Ring at Riken2021

    • Author(s)
      S. Naimi
    • Organizer
      TCHoU workshop, Online, March 29th, 2021
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Status of R3 and new in-ring detectors2020

    • Author(s)
      S. Naimi
    • Organizer
      NucAR workshop, Online, Dec-7 and Dec-10, 2020
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Position Sensitive Detector Development for use in the Rare Radio-Isotope Ring2020

    • Author(s)
      G. Hudson-Chang
    • Organizer
      CNS summer school, Online, 17-21 August 2020
    • Related Report
      2020 Research-status Report
  • [Presentation] First Mass Measurements with the Rare-RI Ring at RIBF/RIKEN for Nuclear Astrophysics2019

    • Author(s)
      Sarah Naimi
    • Organizer
      27th International Nuclear Physics Conference 2019
    • Related Report
      2019 Research-status Report
  • [Presentation] Mass measurement of neutron-rich 122Rh, 123,124Pd and 125Ag nuclides with Rare-RI Ring at RIBF in RIKEN2019

    • Author(s)
      Hongfu Li
    • Organizer
      27th International Nuclear Physics Conference 2019
    • Related Report
      2019 Research-status Report
  • [Remarks] 元素起源の謎の解明に向けた世界最速質量測定が始動

    • URL

      https://www.riken.jp/press/2022/20220428_2/index.html

    • Related Report
      2021 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi