Reference Database for Beta-Delayed Neutron Emission Evaluation

Closed for proposals

Project Type

Coordinated Research Project

Project Code

F41030

CRP

1960

Approved Date

12 September 2012

Status

Closed

Start Date

22 February 2013

Expected End Date

21 February 2018

Completed Date

12 July 2018

Description

The field of beta delayed neutron emission has been of interest since the discovery of nuclear fission. However, the status of compilation of available data is not satisfactory. Applying state-of-the-art experimental techniques, new measurements of beta delayed neutrons have been undertaken at various different laboratories such as GSI (Germany), Triumf (Canada), Riken (Japan) and ORNL (USA). It has been indicated that the IAEA should take a role at the centre of these activities and coordinate the efforts by evaluating, compiling and, eventually, disseminating the results in form of a Reference Database for Beta-delayed Neutron Emission Evaluation. Therefore this CRP is proposed.

Objectives

To enhance Member States’ (MS) knowledge and calculational capabilities in the fields of Nuclear Energy, Safeguards, used fuel and waste management and nuclear sciences by creating a Reference Database for Beta-delayed neutron Emission  that contains both a compilation of existing data and recommended data, which will be made readily available to the user community.

Specific objectives

Compile the existing Beta-delayed neutron data, in particular half-lives, neutron emission probabilities and neutron spectra for individual precursors

Create a reference database of evaluated data for beta-delayed neutron emission

Define and document the evaluation methodology and the “Standards” for delayed neutron emission in different mass regions,

Produce tools to extrapolate results to unknown nuclei by use of theoretical models or systematic trends

Re-evaluate the beta-delayed neutron reactor constants in suitable group format for energy applications and include in database.

CRP Publications

Type

Conference Proceedings (XXII-th International Seminar on Interaction of Neutrons with Nuclei, Dubna, Russia, 24-28 May, 2014)

Year

2014

Description

The total number of delayed neutrons and average half-life of their precursors in the neutron induced fission of 235U, 238U, 239Pu (Summation method), by K. Mitrofanov, V. Piksaikin, et al.

Country/Organization

Russian Federation

Type

International Peer-reviewed journal

Year

2014

Publication URL

http://www.sciencedirect.com/science/article/pii/S0090375214004608

Description

First Compilation and Evaluation of Beta-Delayed Neutron Emission Probabilities and Associated Half-Lives for A = 72 Nuclei, by M. Birch, B. Singh, D. Abriola et al

Country/Organization

Nuclear Data Sheets (ELSEVIER)

Type

INDC(NDS)

Year

2015

Publication URL

http://www-nds.iaea.org/publications/indc/indc-nds-0689.pdf

Description

High Resolution Measurements of Aggregate Delayed Neutron Spectra in Different Time Intervals from Thermal Neutron Induced Fission of 235U, by V. Piksaikin et al.

Country/Organization

IAEA

Type

International Peer-reviewed journal

Year

2016

Publication URL

http://journals.aps.org/prc/pdf/10.1103/PhysRevC.93.025805

Description

Large-scale evaluation of ß-decay rates of r-process nuclei with the inclusion of first-forbidden transitions, by T. Marketin et al (including Supplement with tables)

Country/Organization

Physical Review C (American Physical Society)

Type

INDC(NDS)

Year

2014

Publication URL

http://www-nds.iaea.org/publications/indc/indc-nds-0646.pdf

Description

The absolute total delayed neutron yields, rel. abundances and half-lives of delayed neutron groups in 6- and 8-group model from neutron-induced fission of 232Th, 233U, 236U, 239Pu and 241Am in the energy range from 0.35 MeV to 5 MeV, by V. Piksaikin et al.

Country/Organization

IAEA

Type

International Peer-reviewed web publication

Year

2016

Description

Delayed neutron emission near the shell-closures, by I.N. Borzov

Country/Organization

European Physical Journal Web of Conferences

Type

Proc. of the 24th Russian Particle Accelerator Conference, RuPAC 2014

Year

2014

Description

Experimental study of the time dependence of the activity of delayed neutrons in the fission of 235U by neutrons from the reaction 7LI(p, n) on the electrostatic accelerator EG-1, by K. Mitrofanov, V. Piksaikin, et al.

Country/Organization

Russian Federation

Type

International Peer-reviewed journal (ELSEVIER)

Year

2016

Publication URL

http://www.sciencedirect.com/science/article/pii/S0168900215013169

Description

Characterization of a neutron-beta counting system with beta-delayed neutron emitters, by J. Agramunt, J.L. Tain, JM.B. Gomez-Hornillos, et al.

Country/Organization

Nuclear Instruments and Methods A

Type

International Peer-reviewed journal

Year

2015

Publication URL

http://www.sciencedirect.com/science/article/pii/S0090375215000356

Description

Evaluation of Beta-Delayed Neutron Emission Probabilities and Half-Lives for Z = 2-28, by M. Birch, B. Singh, I. Dillmann, et al.

Country/Organization

Nuclear Data Sheets (ELSEVIER)

Type

International Peer-reviewed journal

Year

2016

Publication URL

https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.117.012501

Description

First measurement of several beta-delayed neutron emitting isotopes beyond N=126, R. Caballero-Foch, A.Algora,…,I.N. Borzov,…,I. Dillmann, …, T. Marketin,…,J.L. Tain, et al

Country/Organization

Physical Review Letters (APS)

Type

International Review Journal

Year

2016

Description

Relative abundances of delayed neutrons and half-lives of their precursors in the interaction of 238U with relativistic protons, by A.S. Egorov, V.M. Piksaikin, et al.

Country/Organization

Progress in Nuclear Energy

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