Request ID	116		Type of the request	Request to be checked
Target	Reaction and process	Incident Energy	Secondary energy or angle	Target uncertainty	Covariance
3-LI-0	(d,x)Be-7 SIG	10 MeV-40 MeV		10	Y
Field	Subfield	Date Request created	Date Request accepted	Ongoing action
Fusion	DONES, IFMIF	31-MAY-21		Y

Requester: Dr Stanislav SIMAKOV at KARLSRUHE, GER
Email: stanislav.simakov@partner.kit.edu

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

Impact:

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

Accuracy:

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:

Review comment:

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

Main references:
Please report any missing information to hprlinfo@oecd-nea.org

Additional file attached:Simakov_EGHPRL_2021May.pdf
Additional file attached:

Request ID 117 Type of the request Request to be checked

Target Reaction and process Incident Energy Secondary energy or angle Target uncertainty Covariance

3-LI-0 (d,x)H-3 SIG,TTY 5 MeV-40 MeV 10 Y

Field Subfield Date Request created Date Request accepted Ongoing action

Fusion DONES, IFMIF 31-MAY-21 Y

Requester: Dr Stanislav SIMAKOV at KARLSRUHE, GER
Email: stanislav.simakov@partner.kit.edu

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

Impact:

The Li(d,x)t reactions will produce 80% of tritium in the IFMIF Li loop [1]. Consequently the accuracy of the Li(d,x)t cross section will impact on the efficiency, design and cost of the planned IFMIF radio-protection measures such as replacement of the yttrium and cold traps for the long tritium retaining, prevention of its permeation in atmosphere, etc. [2,3].

Accuracy:

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

Justification document:

At the requested deuteron energies from 5 MeV up to 40 MeV there are no experimental data for the 6,7Li(d,x)t reaction cross sections; whereas Tritium TTY was measured only once at 40 MeV. The evaluated major deuteron libraries (ENDF, JEFF, FENDL, TENDL) including just released JENDL/DEU disagree with known measurements by a factor 2-3.

More details on the status of cross sections and TTY 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:

In the case of the tritium spectroscopy experiments, the tritium double-differential data (DDX) for reaction (d,x)H-3 are desirable to measure in the maximum t-energy range and for the representative emission angles to allow integration of DDX and thus obtaining the production cross section σ(d,x)t. However, an activation experiment measuring tritium by its decay or by other direct means is sufficient.

Review comment:

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

Main references:
Please report any missing information to hprlinfo@oecd-nea.org

Additional file attached:Simakov_EGHPRL_2021May.pdf
Additional file attached: