Share this Job

Senior Neutronics Scientist

Date: Jun 5, 2021

Location: Oak Ridge, TN, US, 37830

Company: Oak Ridge National Laboratory

Requisition Id 4729 


The Instrument Development and Neutronics Group within the Neutron Technologies Division at Oak Ridge National Laboratory (ORNL) is looking for a Senior Neutronics Scientist.  The mission of this group is to develop designs for new instruments at HFIR and SNS, concepts for new sources and moderators, and to provide radiation transport calculations.  In this role you will contribute to source development efforts at SNS and HFIR with regard to providing perfectly tailored high-intensity neutron beams to our world-class instrument suites, while at the same time minimizing ambient neutron background.  You will ensure – by calculation – that the instruments are shielded to meet the radiation protection requirements, and characterize radionuclide inventories and remnant radiation fields of spent facility components.  You will also contribute to the development of next generation moderators to be deployed in our spallation neutron sources, and scattering kernel and transport code developments as needed to simulate neutron moderation around a spallation target.


Major Duties and Responsibilities: 

  • Contribute to the target/moderator/reflector design by performing target station relevant neutronics analyses, and calculate quantities of interest like moderator neutron performance, radiation-induced material damage estimates, nuclear heating, in interdisciplinary teams of engineers and designers.
  • Develop shielding solutions for SNS target station systems, and neutron beamlines and scattering instruments.
  • Develop strategies to optimize the utilization of neutrons from source to scattering instruments in collaboration with instrument development teams.
  • Contribute to the development and maintenance of nuclear analysis tools to support the Group's complex analysis needs and its research and development efforts in general.
  • Benchmark and validate software tools used in the performance simulation of neutron instruments and sources.
  • Publish results in scientific journals, conference proceedings and ORNL technical reports as appropriate.
  • Maintain a strong commitment to the implementation and perpetuation of laboratory values and ethics.
  • Ensure and monitor compliance with environment, safety, health, and quality program requirements.  Promptly identify ESH and QA issues and communicate them to project and division management, ESH and QA contacts, and/or subcontractor contacts as appropriate.
  • As a member of the ORNL scientific community, you will be expected to commit to ORNL's Research Code of Conduct.  Our full code of conduct, and a statement by the Lab Director's office can be found here:


Basic Qualifications:

  • Ph.D. in Physics, or Nuclear Engineering, with focus on neutron scattering or neutron source characterization.
  • At least 8-10 years of experience in nuclear analyses of neutron sources.
  • Extended experience with Monte Carlo techniques in particle transport, in particular with spallation physics.
  • Experience in shielding analysis and design.
  • Programming experience with C, Fortran, Perl and/or Python and working experience on linux/unix computer platforms.
  • Experience in measuring neutron radiation fields.


Preferred Qualifications:

  • Understanding of neutron scattering kernel development.
  • Experience in conducting neutron scattering experiments.
  • Excellent written and oral communication skills.
  • This position requires access to technology that is subject to export control requirements. It is preferred that successful candidates are qualified for obtaining export control licenses for codes in the nuclear engineering field.


Other Requirements:

Please provide a list of publications when applying for this position. 


About Neutron Sciences Directorate:

The Neutron Sciences Directorate (NScD) at Oak Ridge National Laboratory (ORNL) operates the High Flux Isotope Reactor (HFIR), the United States’ highest flux reactor-based neutron source, and the Spallation Neutron Source (SNS), the world’s most intense pulsed accelerator-based neutron source.  Together these facilities operate 30 instruments for neutron scattering research, each year carrying out in excess of 1,000 experiments in the physical, chemical, materials, biological and medical sciences for more than 3,000 visiting scientists.  HFIR also provides unique facilities for isotope production and neutron irradiation.  To learn more about Neutron Sciences at ORNL go to


Benefits at ORNL:

UT-Battelle offers a quality benefits package, including a matching 401(k), contributory pension plan, paid vacation, and medical/dental plan options.  Onsite amenities include a credit union, medical clinic, cafeteria, coffee stands, and fitness facilities.



Moving can be overwhelming and expensive.  UT-Battelle offers a generous relocation package to ease the transition process.  Domestic and international relocation assistance is available for certain positions.  If invited to interview, be sure to ask your Recruiter (Talent Acquisition Partner) for details.


For more information about our benefits, working here, and living here, visit the “About” tab at



This position will remain open for a minimum of 5 days after which it will close when a qualified candidate is identified and/or hired.

We accept Word (.doc, .docx), Adobe (unsecured .pdf), Rich Text Format (.rtf), and HTML (.htm, .html) up to 5MB in size. Resumes from third party vendors will not be accepted; these resumes will be deleted and the candidates submitted will not be considered for employment.

If you have trouble applying for a position, please email

ORNL is an equal opportunity employer. All qualified applicants, including individuals with disabilities and protected veterans, are encouraged to apply.  UT-Battelle is an E-Verify employer.

Nearest Major Market: Knoxville