新核素~(239)Pa的分离和鉴别

    • 摘要: 用50MeV/u18O离子照射厚天然铀靶,用HPGe探测器测量化学分离后的Pa样品源,观察到了239Pa的β-衰变子体239U的74.66keVγ射线的生长和衰变,首次鉴定了新丰中子核素239Pa,并确定了239Pa的半衰期为(106±30)min。

       

      Abstract: SEPARATIONANDIDENTIFICATIONOFNEWISOTOPE239PaYangWeifanMuWantongYuanShuangguiLiZongweiZhangXueqianYuXian(InstituteofModernPhysics,ChineseAcademyofSciences,Lanzhou730000)ABSTRACTnatUtargetsareirradiatedwith50MeV/u18Oions.ThePasamplesourcesseparatedchemicalyaremeasuredusingaHPGedetector.Anewneutron-richisotope,239Pa,hasbeeni-dentifiedforthefirsttimebyobservationofthegrowthanddecayof239Udaughter.Thehalf-lifeof239Pahasbeendeterminedtobe(106±30)min.Keywords239PaChemicalseparationTransferreaction

       

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