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Seeking a Postdoctoral Researcher or Contract Researcher (W20121)


Research Instruments Group
RIKEN Nishina Center for Accelerator-Based Science
(Director: Tomohiro Uesaka)

Research Field

The research instruments group is the driving force at RI Beam Factory (RIBF) for continuous enhancement of activities and competitiveness of experimental research. Consisting of four teams, we are in charge of the construction, operation and improvement of the core research instruments at RIBF, such as BigRIPS in-flight separator, ZeroDegree spectrometer and SAMURAI spectrometer, and the related infrastructure and equipment.

For more information, please refer to the following webpage:
Research Instruments Group | RIKEN Nishina Center for Accelerator-Based Science

Job title and Job description

Job title, available positions

Postdoctoral Researcher or Contract Researcher, one position

Postdoctoral Researcher is defined as those who obtained a doctoral degree no more than 5 years ago.
Contract Researcher is defined as those who obtained a doctoral degree more than 5 years ago.

Job description

We are seeking a contract researcher who provides technical support for users of the RIBF facility through the delivery of radioactive-isotope (RI) beams utilizing the RI separator BigRIPS, maintenance and management of such core instruments, and related research and development (R&D). The R&D studies include nuclear-reaction studies with RI beams, new isotope/isomer searches, and nuclear structure studies of unstable nuclei, among other experimental investigations. The successful candidate will work as a member of the BigRIPS Team in the Research Instruments Group, RIKEN Nishina Center for Accelerator-Based Science.


The candidate should possess a doctoral degree in science or engineering, or is a prospective PhD candidate who is scheduled to obtain a doctoral degree in science or engineering before the first day of work. The successful candidate is expected to conduct works actively and steadily under the smooth cooperation with persons involved from inside/outside of RIKEN. Experiences in RI beam production and nuclear-physics studies using an accelerator will be regarded positively.

Work location

Branch and address

RIKEN Wako (2-1 Hirosawa, Wako, Saitama 351-0198)

Salary and benefits

  • 1.A one-year fixed-term employment contract, renewable based on evaluation, to a maximum 5 years from the initial date of hire.
  • 2.RIKEN may adjust the above maximum period of renewability based on a) the employee’s abilities, work load at the time of contract completion, performance and work attitude and b) the continuation of the employee’s center, laboratory or project and RIKEN’s management situation and budget at the time. In principle, employment contracts will not be renewed for individuals older than 65 years.
  • 3.The employee’s period of fixed-term employment cannot exceed 10 years from the initial date of hire (or 10 years from April 1, 2013 for fixed-term employees already at RIKEN prior to this date).
  • 4.Depending on the review of the employee’s research results on its third year, the employment contract may not be renewed beyond the third year.

In principle, the first two months of employment is considered a trial period.
Salary will be commensurate with qualifications and experience. Commuting and housing allowances will be provided. Social insurance will be applied. Mandatory membership in the RIKEN Mutual Benefit Society (RIKEN Kyosaikai).

This position falls under the specialized duties discretionary work system; one working day will be calculated as 7 hours and 30 minutes.

Days off include public holidays, New Year's holidays (Dec. 29 - Jan 3), and RIKEN Foundation Day.
No smoking on site (designated smoking areas available).
These and other provisions are in accordance with RIKEN regulations.

RIKEN is promoting a Gender Equality Program by taking various measures to create a workplace where both men and women are able to give full rein to their talents and abilities. When applicants are judged to be equally qualified on the basis of fair and impartial criteria, women applicants will be given preference.

Also, eligible for an exemption from repayment for category 1 scholarship loans provided by the Japan Student Services Organization before fiscal year 2003, and eligible applying for the MEXT Grants-in-Aid for Scientific Research (Kakenhi).

Application and required documents

Required documents

  • 1.Complete CV or CV (with photo and email address)
    *Write the RIKEN job ad number “W20121”, indicated in the parentheses next to the job title, in the RIKEN job ad number section in the upper right corner of your CV.
  • 2.List of research achievement and publications
  • 3.A letter of recommendation from the current supervisor (If unavailable, a letter from a substitute reference will be acceptable.)
  • 4.Summary of major achievements to date and research proposal in future (two pages A4 sized paper, respectively)
  • 5.Consent form for handling personal information based on GDPR
    If you are a resident of the European Economic Area (EEA), you are required to submit the document, "Consent form for handling personal information based on GDPR" with your signature.

    *You will find detailed information about General Data Protection Regulation (GDPR) on the following website:
    Data protection | European Commission

How to apply

Send the PDF formatted application by email to uesaka [at] riken.jp.
Recommendation letters must be emailed directly from the reference to uesaka [at] riken.jp
Note: Application documents will not be returned.


Open until the position is filled. We will proceed with selection process starting from the documents submitted by Oct. 30, 2020

Handling Personal Data

Submitted documents are strictly protected under the RIKEN Privacy Policy and will be used only for the purpose of applicant screening. Personal information will not be disclosed, transferred or loaned to a third party under any circumstances without just cause.

Selection process

Application screening and interview for selected applicants

Start of Employment

January 1, 2021 (Negotiable)

Contact Information / Send application to

RIKEN Nishina Center for Accelerator-Based Science
Research Instruments Group
Director Tomohiro Uesaka
2-1 Hirosawa, Wako, Saitama 351-0198
Email: uesaka [at] riken.jp
For inquiries, please send an email.