NEA Nuclear Data High Priority Request List, HPRL


High Priority Requests (HPR)

General Requests (GR)

Special Purpose Quantities (SPQ)

New Request




Request ID116 Type of the request High Priority request
TargetReaction and processIncident EnergySecondary energy or angleTarget uncertaintyCovariance
 3-LI-0 (d,x)Be-7 SIG  10 MeV-40 MeV  10 Y
FieldSubfieldCreated dateAccepted dateOngoing actionArchived Date
 Fusion DONES, IFMIF 15-MAY-21 31-MAY-21 Y

Send comment Send a comment on this request to NEA.

Requester: Dr Stanislav SIMAKOV at KIT, GER

Project (context): Fusion (DONES, IFMIF) and Accelerator driven neutron sources (e.g., SARAF-II)


The Li(d,x)7Be reactions will produce 100% of radioactive isotope 7Be in the IFMIF Li loop [1]. Consequently the accuracy of the Li(d,x)7Be cross sections will solely impact on the efficiency, design and cost of the IFMIF radio-protection measures which should guarantee the safe accumulation of 7Be in the lithium loop Heat Exchanger and cold inventory traps [2,3].

[1] S. Simakov et al., “Assessment of the 3H and 7Be generation in the IFMIF lithium loop”, J. Nucl. Mat. 329 (2004) 213
[2] A. Ibarra et al., “The European approach to the fusion-like neutron source: the IFMIF-DONES project”, Nuclear Fusion 59 (2019) 065002
[3] F. Martín-Fuertes et al., “Integration of Safety in IFMIF-DONES Design”, Safety 5 (2019) 74


Uncertainties below 10% as a reasonable compromise between application needs and what is practically achievable using standard techniques.

Justification document:

In the requested deuteron energy range from 10 MeV to 40 MeV (the latter is DONES working energy) there are no experimental data for the 6,7Li(d,x)7Be reaction cross sections. Moreover, the evaluated major deuteron libraries (ENDF, JEFF, FENDL, TENDL) including the just-released JENDL/DEU disagree from the existing measurements below 10 MeV.

More details on the status of the cross section data are available in the following documents:
S. Simakov et al., “Status and benchmarking of the deuteron induced Tritium and Beryllium-7 production cross sections in Lithium”, KIT Scientific Working Papers 147, KIT, June 2020; EFFDOC-1438, JEFF Meetings, NEA, November 2020; Presentation at EG HRPL, WPEC Meetings, NEA, 12 May 2021 (see attached file below).

Comment from requester:

Additional file attached: Simakov_EGHPRL_2021May.pdf

Review comment:

Entry Status:
Work in progress (as of SG-C review of May 2021)

Main recent references:
Please report any missing information to