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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.

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Presentation on theme: "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."— Presentation transcript:

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 , China

2 2 Status P  (511)P  (1077) Comments 1994Sc Absolute Exp. 2012Lu Absolute Exp. Jiang(2011) deduced Table of Isotope, 7th edition Eval. NDS Eval. DDEP Eval.

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),  0.11% (1994Sc44 ) Assumed: I  + =  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!


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