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Seeking a Postdoctoral Researcher or Contract Researcher (W21165)


Ion Beam Breeding Team
Beam Mutagenesis Group
RIKEN Nishina Center for Accelerator-Based Science
(Team Leader: Tomoko Abe)

Research Field

The Ion Beam Breeding Team develops tailor-made breeding technology to increase the mutation rate and to adjust the damage size of the target gene by selecting the species, speed, and number of the ions. At the same time, we are developing "mutagenesis research," which aims to elucidate the mechanisms by which heavy ion beams induce mutations, and "mutagenomics research," a new field that uses mutants to determine gene functions. Responsible genes are isolated from selected mutants such as salt tolerant, high-yielding rice and large seeds of Arabidopsis. By collaborating with breeders, our study contributes to breeding varieties for practical use.

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

The candidate will analyze the type and frequency of heavy-ion-beam-induced mutation using genome information, study the mutation spectrum of heavy-ion-beam as a physical mutagen, and initiate basic and applied research on targeted mutagenesis in plants. The successful candidate will establish cooperative relationship with domestic/overseas collaborators to develop novel technologies, and engage in tasks to support ion-beam irradiation experiments about 12 times a year.


The candidate should possess a doctoral degree in relevant fields, or is a prospective PhD candidate who is scheduled to obtain a doctoral degree before the first day of work.

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 of the end of the fiscal year 2025 (March 31, 2026).
  • 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. Discretionary work, 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.
Paid leave includes annual paid leave (up to 20 days depending on the month of employment), special paid leave (childcare, family nursing care, etc.), and work life balance holidays (up to 7 days depending on the month of employment).
There are also additional leave systems such as maternity leave, childcare leave, and family nursing care leave.
RIKEN has introduced telework as a temporary and special measure to prevent the spread of COVID-19. You may be asked to work from home according to the instructions of the institute. You can also choose to work from home with the permission of your supervisor.
No smoking on site (designated smoking areas available).
These and other provisions are in accordance with RIKEN regulations.

RIKEN is actively undertaking initiatives to promote gender equality and diversity, and moving forward with the establishment of a diverse and vibrant research environment. If multiple candidates are found to have the same aptitude following a fair assessment, active efforts will be made to recruit female candidates.

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 “W21165”, 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.)
    • *Please specify the referee’s contact information (Name, affiliation, job title, phone number, and email address)
  • 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 tomoabe [at] riken.jp
(Recommendation letters must be emailed directly from the reference to tomoabe [at] riken.jp)

Note: Application documents will not be returned.


Application must arrive by December 24, 2021(Japan Standard Time)

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, interview and oral presentation by selected applicants

Start of Employment

April 1st, 2022 (Negotiable)

Contact Information

RIKEN Nishina Center for Accelerator-Based Science
Ion Beam Breeding Team
Team Leader Tomoko Abe
2-1 Hirosawa, Wako, Saitama 351-0198
Email: tomoabe [at] riken.jp
For inquiries, please contact by email.


Updated as of Nov 16, 2021: "Deadline"