摘要
采用低本底ＮａＩ—ＨｐＧｅ反康普顿谱仪和 γ－γ—Ｔ（ＨｐＧｅ—ＨｐＧｅ）三参数快慢符合系统研究了^(７０)Ａｓ３７→^(７０)Ｇｅ_(３８)的衰变，通过γ单谱和反康普顿谱的分析，给出了６５条γ射线的能量及相对强度；利用符合关系建立了^(７０)Ａｓ３７→^(７０)Ｇｅ_(３８)的衰变纲目，其中，１０３６．９９、１１９６．６６、１５３９．２９、２５３１．７ｋｅＶ γ射线为首次测到的， ３５７０．５３、４２４３．１０、 ５２６５．８１ｋｅＶ能级和４９６.７４、 １２９５．２４、１４１７．２４、 １８８１．６７、２２１９．３４、 ２３２５．４２、 ２４２４．４１ｋｅＶ γ射线的跃迁位置首次确定，并计算了各能级的 β~＋和ＥＣ衰变强度。
The decay of ^(70)As to levels in ^(70)Ge has been studied using a NaI-HpGe Compton-suppression spectrometer and a three-parameter(γ-- γ-T) coincidence system of HpGe-HpGe detectors. From the single γ-ray spectra, the energies and relative intensities of 65 gamma rays were determined. Gamma-rays of 1036.99, 1196.66, 1539.29 and 2531.7keV were observed for the first take. From the coincidence data, the decay scheme was constructed. Five new levels of 3570.53, 3744.23, 4243.10, 4554.25 and 5265.81keV and some previoualy unknown transitions (corresponding to 496.74, 685.50, 1295.24, 1417.24, 1507.80, 1881.67, 2219.34, 2325.42 and 2424.41keV γ-rays) have been found. The intensities of β^+ and electron capture feeding corresponding levels and lgft values were calculated.
出处
《核技术》
CAS
CSCD
北大核心
2000年第4期236-242,共7页
Nuclear Techniques
基金
国家自然科学基金!19635030
中国科学院资助!KJ952-S1-420
