1. Evaluation of the absolute emission probability of 1077 keV  -ray for 68 Ga Huang Xiaolong 2013 ， 6 China Nuclear Data Center China Institute of Atomic Energy, P.O. Box 275(41), Beijing 102413, China e-mail: huang@ciae.ac.cn

2. 2 Status P  (511)P  (1077) Comments 1994Sc4489.14 113.22 3Absolute Exp. 2012Lu1490.5 303.25 11Absolute Exp. Jiang(2011)89.42.56 9deduced Table of Isotope, 7th edition 89.3 16 3.0 3Eval. NDS88.93.22 3Eval. DDEP89.14 113.22 3Eval.

3. 3 Background ++  1077keV,3~3.2%  +,  1077keV =2.56%,China

4. 4 Reason ? a large difference between the cross section deduced with 511keV and 1077keV  -ray is up to ~30% Maybe the current decay data of 68 Ga, that’s the P  (1077keV), has a problem.

5. 5 Jiang’s Measurement Cross section exp.: Irradiation of the samples(Ga 2 O 3 powder ) was carried out at Cockcraft-Walton accelerator in CIAE and lasted 40 min. The finial results of 69 Ga(n,2n) 68 Ga reaction c-s at En=14.9MeV was 1030  31(mb) with P  (1077keV)= 2.56  0.09%.

6. 6 Exp. data status on relative  -ray intensities LRSW results are in good agreement with Jiang’s exp. and NDS eval. This means the present exp. data on relative  -ray intensities are good.

7. 7 Eval. P  (1077keV)-1 The available measured I  + values are little changed: I  + =88  11%(1959Ra), 89.2%(1969Va16), 89.14  0.11% (1994Sc44 ) Assumed: I  + = 89.14  0.11%. From LOGFT,  /  +(1077keV level) =1.505,  /  +(ground state)=0.1017, and  -ray intensity balance, deduced P  (1077keV)=2.81  0.01% This value is obviously different from the absolute measuremed value:3.22  0.03%, or Jiang’s deduced value: 2.56  0.09%.

8. 8 Eval. P  (1077keV)-2 In order to eval. the P  (1077keV), the measured ratio of the intensity for positrons(p ann ) and intensity for 1077keV(p 1077 ) are considered. The weighted average results are adopted as the measured values are discrepant.

9. 9 Eval. P  (1077keV)-3 Consider: P ann /P 1077 =65.6  0.4 %. From LOGFT,  /  +(1077keV level) =1.505,  /  +(ground state)=0.1017, and  -ray intensity balance, deduced P  (1077keV)= 2.72  0.16 % I  + =89.2  0.2% Also, this value is different from the absolute measuremed value:3.22  0.03%, or Jiang’s deduced value: 2.56  0.09%.

10. 10 Discussion -1 In order to verify the rationality of our eval., mainly C-S measurements ~14.8MeV are adjusted using present eval. It’s obvious that the good agreement is obtained. Thus, present evaluated P  (1077keV) is considered superior to other evaluations such as NDS/DDEP.

11. 11 Discussion-2

12. 12 谢谢！