90 research outputs found
固体β射线探测器及其应用
我们建立了两台不同类型的固体β射线望远镜系统,并成功地用于实验.本文以这两个望远镜系统为例,阐述了固体β射线探测器的特点,及其在核物理实验研究中所起的重要作用.Two sets of solid β-ray telescopes of different type were bunt and used successfully in experiments.. This paper gives examples of two telescopes to describe the featureof solid β-ray detectors and their important function in experiments of nuclear physics.国家自然科学基
我国重质量丰中子新核素的合成、鉴别和研究实现重要突破
本文叙述了远离β稳定线新核素尤其是重质量丰中子新核素合成和研究的重要意义,介绍了合成和鉴别的技术路线,报告了我国在该领域的研究现状
新核素~(237)Th递次衰变曲线分解
按照合成新丰中子核 ̄(237)Th的实验数据处理要求,设计了相应的数值方法和计算机程序,采用非迭代方法和随机搜索优化方法分解递次衰变曲线,得到了 ̄(237)Th的半衰期,有关结果检验并支持了实验中合成 ̄(237)Th的结论
中、重质量区新核素的合成
论述了远离稳定线核素合成的科学意义,总结了有关新核素合成研究的国内外概况以及中、重质量区远离稳定线核素的主要产生机制.给出了我国合成的一些新核素的半衰期,并与理论预言值进行了比较.简略地叙述了核反应产物的传输、分离以及新核素的鉴别方法The importance of synthesis of new nuclei far from stability is concisely recounted. The prograsses on synthesis of the new nuclides and the main methods used for producing new nuclei far from stability in the intermediate and heavy mass region is summarized. The half lives of some new nuclides synthesized in china are compared with those calculated based on the gross theory and the microscopic theory. Some examples for transport and chemical separation of the nuclear reaction products as well as i...国家自然科学基金,中国科学院支持资
核物理研究中的一个前沿领域──重丰中子区新核素的合成和鉴别
叙述了远离稳定线新核素研究的重要意义。介绍了合成和鉴别重丰中子区新核素的技术路线。报告了我们的实验结果:在世界上首次合成和鉴别了两种重丰中子新核素185Hf和237Th,测定了它们的半衰期分别为3.5 0.6min和5.0 0.9min,发现了一条能量为164.5 0.5keV的新 射线并指定为185Hf衰变。中国科学院八五重大项
Gamma decay of the lowly excited states of 189Re
189W activities were produced via the 192Os(n, α) reaction using irradiation of isotopically enriched 192Os metallic powder of ~100 mg/cm2 with 14 MeV neutrons. The X-γ and γ-γ coincidence measurements were made so as to obtain γ rays from 189W decay and its coincidence relations. A new simple decay scheme of 189W including three γ rays of 210.2, 229.6 and 260.2 keV is proposed. Two new levels of 189Re at 470.4 and 489.8 keV are assigned
Dependence of the cross sections for Ir isotopes on the values of Qgg in the heavy ion collision
197Au were irradiated with 47 MeV/u 12C ions. Iridium was produced via the multinucleon transfer reactions in bombardments of 197Au with 12C. and was separated radiochemically from Au and the mixture of the reaction products. The γ radioactivities of Ir isotopes were measured by using a HPGe detector. The production cross sections of Ir isotopes were determined from activities of Ir isotopes at the end of bombardment and the other relative data. It has been found that the cross sections for neutron-rich iso..
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