原子能科学技术
原子能科學技術
원자능과학기술
ATOMIC ENERGY SCIENCE AND TECHNOLOGY
2013年
z2期
402-405
,共4页
左走翼%郑永男%徐永军%崔保群%李立强%马英俊%范平
左走翼%鄭永男%徐永軍%崔保群%李立彊%馬英俊%範平
좌주익%정영남%서영군%최보군%리립강%마영준%범평
62Zn%放射性核束%扰动角关联%正电子湮没谱学
62Zn%放射性覈束%擾動角關聯%正電子湮沒譜學
62Zn%방사성핵속%우동각관련%정전자인몰보학
62 Zn%radioactive beam%perturbed angular correlation%positron annihilation spectroscopy
在中国原子能科学研究院（CIAE）HI-13串列加速器上建立了一台同位素在线分离器（ISOL ），产生30 keV的62 Zn放射性核束，用于扰动角关联（PAC ）和正电子湮没谱学（PAS ）的研究。将62 Zn放射性核束作为PAC探针核和正电子源，采用扰动角关联和正电子湮没多普勒展宽两种方法研究了B掺杂在高定向热解石墨（HOPG）中产生的缺陷。在未掺杂样品中未观察到扰动，这说明探针核可能位于基面之间的间隙内。在掺杂样品中观察到较强的扰动，实验测量的电四极相互作用的频率ω0＝157 M rad/s ，意味着62 Zn探针核B掺杂产生的位错环捕获。正电子湮没多普勒展宽测量得到的掺B的 HOPG的多普勒展宽 S明显增大，表明掺B的HOPG中掺杂产生了缺陷。扰动角关联和正电子湮没测量均表明在掺B的 HOPG中掺杂引入了缺陷。
在中國原子能科學研究院（CIAE）HI-13串列加速器上建立瞭一檯同位素在線分離器（ISOL ），產生30 keV的62 Zn放射性覈束，用于擾動角關聯（PAC ）和正電子湮沒譜學（PAS ）的研究。將62 Zn放射性覈束作為PAC探針覈和正電子源，採用擾動角關聯和正電子湮沒多普勒展寬兩種方法研究瞭B摻雜在高定嚮熱解石墨（HOPG）中產生的缺陷。在未摻雜樣品中未觀察到擾動，這說明探針覈可能位于基麵之間的間隙內。在摻雜樣品中觀察到較彊的擾動，實驗測量的電四極相互作用的頻率ω0＝157 M rad/s ，意味著62 Zn探針覈B摻雜產生的位錯環捕穫。正電子湮沒多普勒展寬測量得到的摻B的 HOPG的多普勒展寬 S明顯增大，錶明摻B的HOPG中摻雜產生瞭缺陷。擾動角關聯和正電子湮沒測量均錶明在摻B的 HOPG中摻雜引入瞭缺陷。
재중국원자능과학연구원（CIAE）HI-13천렬가속기상건립료일태동위소재선분리기（ISOL ），산생30 keV적62 Zn방사성핵속，용우우동각관련（PAC ）화정전자인몰보학（PAS ）적연구。장62 Zn방사성핵속작위PAC탐침핵화정전자원，채용우동각관련화정전자인몰다보륵전관량충방법연구료B참잡재고정향열해석묵（HOPG）중산생적결함。재미참잡양품중미관찰도우동，저설명탐침핵가능위우기면지간적간극내。재참잡양품중관찰도교강적우동，실험측량적전사겁상호작용적빈솔ω0＝157 M rad/s ，의미착62 Zn탐침핵B참잡산생적위착배포획。정전자인몰다보륵전관측량득도적참B적 HOPG적다보륵전관 S명현증대，표명참B적HOPG중참잡산생료결함。우동각관련화정전자인몰측량균표명재참B적 HOPG중참잡인입료결함。
An isotope separator on-line (ISOL ) dedicated to on-line perturbed angular correlation (PAC ) and positron annihilation spectroscopy (PAS ) was constructed at CIAE based on HI-13 Tandem Accelerator ,and a 30 keV radioactive beam of 62Zn was produced by it .Using the 62Zn radioactive beam ,the defects in B doped highly oriented pyrolytic graphite (HOPG) were investigated from two angles of view by both positron annihilation Doppler broadening and perturbed angular correlation techniques . The physical performances of HOPG depend greatly on impurity-doping . Doping would induce defects in HOPG .No perturbation was observed in undopped HOPG and this indicates that the probe nuclei are located in the space between two basic planes .A strong perturbation were detected in B doped HOPG and the measured quadrupole interaction frequency ω0 is 157 M rad/s . It indicates that the 62 Zn probe nuclei are captured by the dislocation loops induced by B doping .The parameter S of the positron annihilation Doppler broadening measurement is obviously larger in B dopped HOPG than in undoped HOPG ,and this demonstrates that B doping induces defects in HOPG . The results obtained by the perturbed angular correlation and the positron annihilation are in good agreement ,which shows the defects are induced by B doping in HOPG .
