Nuclear Structure Data Evaluation at KAERI: Insights from the 21st NSDD Meeting

The Korea Atomic Energy Research Institute (KAERI) participated in the 21st NSDD Meeting in Vienna, Austria, in April 2015, focusing on activities related to nuclear structure data evaluation. Collaborating with experts, KAERI began evaluating the ENSDF mass chain, including masses such as A=72 and A=144. They worked on nuclides datasets, adopted levels, and simulated studies using nuclear structure data to enhance their understanding. Additionally, evaluations were conducted on specific nuclides like 72Fe, 72Co, 72Ni, and 73Co to determine decay characteristics and calculate key parameters.

• KAERI
• Nuclear Structure Data
• ENSDF
• NSDD Meeting
• Vienna

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1. Korea Atomic Energy Research Institute (KAERI) Jounghwa Lee 21st NSDD Meeting, Vienna, Austria, April 2015

2. Activities Our activities for nuclear structure data are as follow Evaluation of Nuclear Structure Data Introduction of ENSDF Simulation study using nuclear structure data 21st NSDD Meeting, Vienna, Austria, April 2015

3. Nuclear Structure Data We are beginning step of ENSDF mass chain evaluations Our institute is not assigned mass chain yet Collaborate with A.A. Sonzogni Guidance and feedback in the evaluation work Evaluation Activities Evaluated a part of mass chain A=72 (2014) Mass chain A=144 is in progress 21st NSDD Meeting, Vienna, Austria, April 2015

4. Evaluation of mass chain A=72 Visited NNDC for 2 weeks and worked together on a part of A=72 mass chain Nuclides Dataset Adopted Levels Adopted Levels Adopted Levels Adopted Levels, Gammas References 2013TA14 2013MA87 2011DA08 2011CH42 2012RA10 2011CH42 2012KR07 2012RO21 2013GU23 Note 72Mn Observed 72Mn T1/2, % -n % -n Level, E , T1/2 New dataset New dataset Level, E , T1/2 Level, E , Band g factor 72Fe 72Co 72Ni 73Co -n decay 198Pt(76Ge,X ) 72Ge 72Ga -decay 70Zn( ,2n ), 70Ge( ,2He) Coulomb Excitation 21st NSDD Meeting, Vienna, Austria, April 2015

5. Evaluation of 72Fe & 72Co Adopted levels of 72Fe Ground state T1/2: 150 ns 19 ms 4 (2013MA87) New systematics to calculate % -n % -n: 27.6 SY (Kratz-Herrman formula (2002PF04)) 17 SY (McCutchan et al systematics (2012MC04)) Adopted levels of 72Co New systematics to calculate % -n % -n: 6 (2) (Preliminary value(2005MA95)) 17 SY (McCutchan et al systematics (2012MC04)) 21st NSDD Meeting, Vienna, Austria, April 2015

6. Evaluation of 72Ni 73Co -n decay 72Ni ENSDF 2012RA10: Level, E , % -n Adopted Levels, Gammas 72Co -decay 73Co -n decay 198Pt(76Ge,X ) 198Pt(76Ge,X ) New datasets 2011CH42: Level, E , T1/2 21st NSDD Meeting, Vienna, Austria, April 2015

7. Evaluation of 72Ge 72Ga -decay 2012KR07: Appl Rad & Isot 70, 1649 (2012) K. S. Krane A lot of levels and gammas Some levels and gammas are rearranged Number of levels 27 Number of gammas 111 Weighted means of 1971RE04, 1968CA20, 1974CH07, 2001ME01, 2004MI10, 2012KR07 21st NSDD Meeting, Vienna, Austria, April 2015

8. Evaluation of 72Ge 70Zn( ,2n ), 70Ge( ,2He) 2012RO21: Eur. Phys. J. A 48, 99 (2012) D. G. Roux et al. New 72Ge levels & gammas Directional correlation (DCO), Polarization (POL) Bands Coulomb Excitation 2013GU23: Phys. Rev. C 88, 014301 (2013) G.Gurdal et al g-factor 21st NSDD Meeting, Vienna, Austria, April 2015

9. Evaluation of mass chain A=144 We are planning to evaluate mass chain A=144, this year The progress of the evaluation of A=144 Nuclides Dataset References 2012WA38 2003Be05 2005BI02 2005BI02 2012MU08 Note 144Cs 145Xe -n decay (188 ms) Adopted Levels, Gammas Adopted Levels, Gammas Q( -n ) T1/2, % -n T1/2 T1/2 New dataset 144Xe 144Ba 252Cf SF Decay 235U(N, F ) 21st NSDD Meeting, Vienna, Austria, April 2015

10. Evaluation of 144Cs & 144Xe 145Xe -n decay (188 ms) This dataset has only parent and normalization records (no levels & gammas) Corrected the Q-value of -delayed neutron emission 2598 (27) keV 3705 (28) keV (2012WA38) Adopted Levels, Gammas of 144Xe Ground state T1/2: 1.15 (20) s (1976AH01) 388 (7) ms (2003BE05) Add % -n: 3.0 (3) (2003BE05) 21st NSDD Meeting, Vienna, Austria, April 2015

11. Evaluation of 144Ba 252Cf SF Decay 2005BI02: Phy.s Rev. C 71, 011301 (2005) D.C. Biswas et al. Half-lives of levels 235U(N, F ) New dataset 2012MU08: Phy.s Rev. C 85, 064321 (2012) S.Mukhopadhyay et al. Level, E and band 21st NSDD Meeting, Vienna, Austria, April 2015

12. Introduction of ENSDF ENSDF still little known in Korea Theoretical and experimental physicist scarecely know ENSDF Also the concept of evaluation is unfamiliar We are trying to introduce ENSDF and its analysis programs at a conference and a workshop 2013 Korean Physics Society (Spring) 2014 Workshop on Nuclear Data Measurement and Related Subject Encourage to use ENSDF as reference It is very useful 21st NSDD Meeting, Vienna, Austria, April 2015

13. Simulation Study We are interested in the nuclear data of simulation codes Simulation programs are often used to study nuclear reaction and decay Wondering that the simulation results are reliable Check simulation code Comparing simulation results with experiments or evaluated values Read the nuclear data in the library 21st NSDD Meeting, Vienna, Austria, April 2015

14. ENSDF in Geant4 Data Library 66Co levels in Geant4 library (keV) G4PhotonEvaporation (from ENSDF) G4RadioactiveDecay (from XUNDL) 981 642 881 390 510 175 175 0 0 Energy levels from decay data and gamma transition data are stored separately These data are originated from ENSDF Some nuclides have XUNDL data and give rise to inconsistency 21st NSDD Meeting, Vienna, Austria, April 2015

15. ENSDF in Geant4 Data Library The simulation result of 66Fe -decay Phys. Rev. C 85, 014328 (2012) Simulation result using default data Too many gammas The result is not reasonable Simulation result using evaluated data Reproduce the experimental result well 21st NSDD Meeting, Vienna, Austria, April 2015

16. Thank you ! 21st NSDD Meeting, Vienna, Austria, April 2015