循环带传输系统

针对短半衰期核素实验研究的特点,设计了一套新的收集和测量带系统,此系统采用低负载以及循环带结构,从而缩短了传输所需时间,大幅减少了收集带的更换频率。使之可以用于半衰期在0.2s以上的短半衰期核素的研究。

多道时间幅度变换电路的设计

介绍了一个多道时间幅度转换器(TAC)电路。它主要由起-停型时间幅度变换电路、放大电路、采样保持电路、积分控制电路、采样保持控制电路、判断电路等组成。其特点是精度高,速度快,电路简单,多通道,易与计算机数据获取和处理系统配合使用。可以广泛应用于大型探测器阵列前端电子学系统。

洞穴碳酸盐^230Th-^234U-^238U测年初始钍校正的等时线研究

IEECAS SKLLQG

同位旋非对称核物质性质与扩展的BHF方法(Ⅳ)单粒子势与有效质量

在扩展的同位旋相关的Brueckner Hartree Fock理论框架内 ,计算了同位旋非对称核物质中质子与中子的单粒子势和有效质量及其同位旋效应 ,并详细研究和讨论了基态关联对单粒子势和有效质量及其同位旋依赖的影响

低能量沉积下位置灵敏硅探测器位置畸变的修正

介绍了一种低能量沉积下位置灵敏硅探测器位置畸变的修正方法 ,采用了与探测器中能量沉积相关的修正因子 ,f (Δ1,Δ2 ,E)调节可调参数Δ1和Δ2 ,对位置畸变进行了修正 ,得到了很好的修正效果

Projectile fragmentation of Kr-86 at 64 MeV/nucleon

We measured fragmentation cross sections produced using the primary beam of Kr-86 at 64 MeV/nucleon on Be-9 and Ta-181 targets. The cross sections were obtained by integrating the momentum distributions of isotopes with 25 <= Z <= 36 measured using the RIPS fragment separator at RIKEN. The cross-section ratios obtained with the Ta-181 and Be-9 targets depend on the fragment masses, contrary to the simple geometrical models. We compared the extracted cross sections to EPAX; an empirical parametrization of fragmentation cross sections. Predictions from current EPAX parametrization severely overestimate the production cross sections of very neutron-rich isotopes. Attempts to obtain another set of EPAX parameters specific to the reaction studied here to extrapolate the neutron-rich nuclei more accurately have not been very successful, suggesting that accurate predictions of production cross sections of nuclei far from the valley of stability require information of nuclear properties that are not present in EPAX.

Neutron-Proton Asymmetry Dependence of Spectroscopic Factors in Ar Isotopes

Spectroscopic factors have been extracted for proton-rich Ar-34 and neutron-rich Ar-46 using the (p, d) neutron transfer reaction. The experimental results show little reduction of the ground state neutron spectroscopic factor of the proton-rich nucleus Ar-34 compared to that of Ar-46. The results suggest that correlations, which generally reduce such spectroscopic factors, do not depend strongly on the neutronproton asymmetry of the nucleus in this isotopic region as was reported in knockout reactions. The present results are consistent with results from systematic studies of transfer reactions but inconsistent with the trends observed in knockout reaction measurements.