共查询到20条相似文献,搜索用时 31 毫秒
1.
GAO Bing-Shui ZHOU Xiao-Hong FANG Yong-De ZHANG Yu-Hu LIU Min-Liang WANG Si-Cheng WANG Jian-Guo MA Fei GUO Ying-Xiang WU Xiao-Guang HE Chuang-Ye ZHENG Yun WANG Zhi-Min YAN Xin-Liang WANG Zhi-Gang FANG Fang 《中国物理C(英文版)》2014,38(6):064001-064001
The neutron rich nucleus 193Os was produced in the 192Os(7Li, 6Li)193Os reaction. An isomeric state based on the 9/2-[505] Nilsson orbital was identified in the present work. The half-life of the isomeric state was extracted and discussed in terms of the K quantum number. A level scheme built on the isomeric state was proposed based on the experimental data. 相似文献
2.
Nuclear ground and isomeric state spins of several isotopes of the refractory elements (Y, Nb, Mo, Tc, Rh, Ta, Re, Os, Ir, Pt) measured by the atomic beam magnetic resonance method, are reported. The atomic ground-state g-factor for the Os atom has also been measured. 相似文献
3.
B. Reussière F. Ibrahim P. Kilcher F. Le Blanc J. Oms J. Sauvage A. Wojtasiewicz 《Zeitschrift für Physik A Hadrons and Nuclei》1995,351(2):127-128
The decay of181Ir has been studied on-line with mass-separated sources from the ISOCELE facility. The level scheme of181 Os has been established. The isomeric state has been located at 48.9 keV above the ground state. Thus the isomeric and ground states are identified as the 7/2?(T1/2 =2.7 m) and 1/2?(T1/2=105 m) levels respectively. 相似文献
4.
Dirck Benson Jr. P. Kleinheinz R. K. Sheline E. B. Shera 《Zeitschrift für Physik A Hadrons and Nuclei》1978,285(4):405-413
The previously completely unknown energy levels of193Os have been investigated using the reactions192Os(d, p)193Os and192Os(n, γ)193Os. The neutron separation energy was measured to be 5583.5±2.0 keV. Most of the states below 500 keV can be qualitatively interpreted in terms of the Nilsson model; however the occurrence of four levels with significantl=1 transfer strength in this energy range is incompatible with that model. The Nilsson orbital systematics of the odd-A Os and W isotopes are compared. 相似文献
5.
I. Berkes O. El Hajjaji M. Fahad B. Hlimi G. Marest H. Sayouty G. Langouche M. Van Der Heyden M. Tong 《Hyperfine Interactions》1987,35(1-4):1023-1026
Absorption Mössbauer spectra were measured on low temperature (6–21 mK) oriented nuclei. For magnetic orientation this method allows the determination of the sign of the parent state magnetic moment. The method enables the determination of the parent state quadrupole coupling even for a polycrystalline sample. Signs of ground state magnetic moments for191Pt and193Os, and electric quadrupole moments for125Tem and129Te are determined. 相似文献
6.
The decay of 193Os to 193Ir has been studied by γγ angular correlations. Inconsistencies between previous angular correlations, internal conversion coefficients, and nuclear orientation angular distributions have been satisfactorily resolved by the present results. These data are used to derive a set of multipole mixing ratios of the transitions between low-lying states. The resulting electromagnetic transition moments are compared with calculations based on the Nilsson model with Coriolis mixing and on the interacting boson-fermion model. 相似文献
7.
本工作从Nilsson单粒子能级入手,计算了形变核186Os、187Ir、189Os和193Au作为激发函数的固有能级密度参数aint和有效能级密度参数(包括核集体运动效应)aeff.由这样能量相关的能级密度参数计算的裂变几率Pf(U)与本工作的裂变几率符合很好. Based on the single-particle levels given by Nilsson,the intrinsic and effective(with collective effects)level density parameters as a function of theexcitation energy for the 186Os, 187Ir, 189Os and 193Au deformation nuclei have been calculatedin the range of the excitation energy up to 150MeV. The calculated fission probabilities Pf(U) are consistent satisfactorily with the experimental data when a nonadiabtic estimation ofthe collective effects was used to calculate the nuclear level density parameters. 相似文献
8.
E. V. Tkalya 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(6):818-821
A model of nuclear excitation by electron transition near the K-shell ionization threshold of an atom is proposed. The nuclear excitation cross sections have been calculated for 197Au, 193Ir, and 189Os as functions of the energy of the photons ionizing the atomic shell. It is shown that excitation of 189Os begins under the K-shell photoionization threshold of Os, while excitation of 197Au and 193Ir begins above the K-shell photoionization threshold of Au and Ir, respectively. 相似文献
9.
运用群论及原子分子反应静力学方法,推导了XY(H,Li,Na)分子基态的电子态及相应的离解极限.并采用密度泛函方法(B3LYP)和二次组态相互作用方法(QCISD)优化计算了XY(H,Li,Na)分子基态的平衡结构、振动频率和离解能.使用QCISD/6-311++G(3df,3pd)方法,对XY(H,Li,Na)分子基态进行了单点能扫描计算,采用最小二乘法拟合Murrell-Sorbie函数得到了相应的势能函数和与该基态相对应的光谱常数(Be,αe,ωe和ωeχe),计算结果与实验数据符合得相当好.
关键词:
组态相关方法
基态
势能函数 相似文献
10.
The decay of isomeric states in 201mTl, 202mTl and 204mTl is investigated with a Ge(Li) detector. The isomeric states are produced with LINAC bremsstrahlung (24–32 MeV). Life-times and precise energies have been determined. In the 201mTl case, shape isomerism is proposed, based on calculations of the total potential energy surfaces and calculations of the lifetime in a Nilsson model. 相似文献
11.
Y. Yamazaki R. K. Sheline D. G. Burke 《Zeitschrift für Physik A Hadrons and Nuclei》1978,285(2):191-201
The nuclear structures of193Ir and195Ir have been studied using the194Pt(t, α) and196Pt(t, α) reactions. Levels up to ~2MeV in excitation energy were studied with a resolution of ~13keV (FWHM) and spectroscopic strengths were extracted. The low-lying states in193Ir have been interpreted in terms of both the Nilsson and the rotation-vibration models including Coriolis, particle-vibration and rotation-vibrational couplings. The previously assigned 3/2+ [402], 11/2? [505], 1/2+[400] and 1/2+[411] bands were populated and candidates for the 5/2+ [402] and 7/2+ [404] bandheads were observed. TheK 0 +2 gamma vibration based on the ground state was populated because it is mixed with the 7/2+ [404] state. Surprisingly, there was no significant difference between the stripping and pick-up strengths for the low-lying states in193Ir, suggesting that the equilibrium nuclear shape of193Ir has large overlaps with the shapes of both192Os and194Pt. The nuclear level structure of195Ir appears to be similar to those of the lighter iridium isotopes. 相似文献
12.
The excited state electric dipole moments of three isomeric fluorophenylisocyanates are determined using the method of solvatochromic
shift measurements recently suggested from our laboratory. 相似文献
13.
F.W.N. De Boer P.F.A. Goudsmit B.J. Meijer J.C. Kapteyn J. Konijn R. Kamermans 《Nuclear Physics A》1976,263(3):397-409
The decay properties of the 31 y 178Hf isomeric state have been investigated by means of a Ge(Li)-NaI(Tl) Compton suppression device and a Si(Li) detector, as well as with Ge(Li) and Ge(Li), intrinsic Ge and Si(Li) coincidence arrangements. From the E3 character of the unobserved isomeric transition (11.7 ≦ EIT ≦ 16.7 keV), deduced from L-subshell and M/L ratios, Iπ, K of the isomeric level was determined as 16+, 16. The {p[404] ↓ + p1514] ↑ + n[514] ↓ + n[624]↑}16+ + four quasi-particle configuration was assigned to this level at 2447.5 ± 2.5 keV. As proposed earlier the isomeric E3 transition decays to the 13? level of the band built upon the Iπ = 8? isomer. The |gK?gR| values derived from ratios of interband transitions show that the 8? isomer contains about 36 % of the p[404] ↓ + p[514] ↑ configuration and about 64 % of the n[624] ↑ + n[514] ↓ configuration. 相似文献
14.
王华磊 张玉虎 周小红 郭应祥 雷祥国 徐树威 谢元祥 郑勇 柳敏良 邢烨炳 谢成营 宋立涛 郭文涛 T.Hayakawa M.Oshima Y.Toh J.Katakura Y.Hatssukawa M.Matsuda N.Shinohara T.Ishii H.Kusakari M.Sugawara T.Komatsubara 《原子核物理评论》2006,23(1):13-17
利用在束实验产生具有β^+/EC衰变性质核素^176,178Ir,分析了在柬实验条件下获得的γ—γ符合数据,识别出了^176Os的4条新能级和13条新γ跃迁、^178Os的5条新能级和14条新γ跃迁。籍助氨喷嘴快速带传输系统,进一步对^176Ir的β’/EC衰变进行了测量,在确认在束测量新γ射线的同时建议了^176Ir的一个低自旋同核异能态。通过两准粒子耦舍的半经验计算,建议了^176,178Ir基态及同核异能态的组态。The γ rays following the β^+/EC decay of ^176. 178Ir nuclei have been investigated using in-beam γ- ray experiment. A total of 4 new levels, 13 new γ transitions of ^176Os and 5 new levels, 14 new γ transitions of ^178Os were identified. In addition, with the aid of a helium-jet recoil fast tape transport system, the β^+/EC decay of ^176Ir was further studied, the above new γ rays were proved and an isomer was proposed in ^176Ir. By the semiempirical calculations of two-quasiparticle intrinsic states of odd-odd nuclei, the configurations of ground states and isomeric states were also proposed for ^176, 178Ir 相似文献
15.
Z. Plajner J. Frána I. Řezanka A. špalek M. Fišer 《Zeitschrift für Physik A Hadrons and Nuclei》1970,233(2):122-132
The decay of193m Hg to193Au levels was investigated by means of Ge(Li) and Ge(Li)-NaI(Tl) coincidence spectrometers. In theγ-ray spectrum about 120 transitions were observed, about 80 of them being new. Forty coincidences betweenγ-transitions were observed. The level scheme of193Au, including 12 earlier known levels as well as 17 new and corrected levels, has been constructed on the basis of the balance of energy sums and the observed coincidences. Possible multipolarities of 33 transitions were determined. Possible spins and parities of several levels were deduced from the determined multipolarities. 相似文献
16.
Internal conversion electrons from the decay of 148Ce and 148mPr have been measured with a Si(Li) detector. The radioactive sources were produced by the thermal neutron-induced fission of 235U, followed by an on-line mass separation. K- and L-conversion electrons of the isomeric transition from 148mPr were newly observed at 34.6 and 70.8 keV, respectively. The M3 multipolarity was assigned to this transition from the experimental conversion coefficients, and, consequently, the 76.8 keV isomeric level was found to be a 4- state. Parities of some excited levels in 148Pr were also deduced. 相似文献
17.
Polikarpos Pissis 《Zeitschrift für Physik A Hadrons and Nuclei》1978,287(1):51-55
The 12? isomeric state of206Tl formerly produced by charged particles, was produced in 14 MeV neutron induced (n, α) reaction on Bi. An intensity balance was deduced from known gamma lines and several new weak gamma lines were observed. Theoretical considerations on the production probability of the isomeric state and on some intensity ratios are given. The half-life of the isomeric state was determined in good agreement with former measurements. 相似文献
18.
Hans Többe 《Zeitschrift für Physik A Hadrons and Nuclei》1970,236(5):403-409
Gamma ray spectra of a mixture of the isotopes86Br and87Br have been measured by means of a Ge(Li) detector. Both manual and automated techniques were used to separate bromine from other fission products of natural uranium. A total of 13 gamma rays were observed. The most intense of the86Br gamma peaks (1,565 keV) was found to grow in with a half-life of 4.5±1 s. This is explained to be due to an isomeric state in86Br decaying to the ground state. 相似文献
19.
Agda Artna-Cohen 《Journal of Quantitative Spectroscopy & Radiative Transfer》1988,40(6):663-684
A compilation of selected nuclear gamma rays has been prepared in order to identify the most attractive candidate nuclei for a gamma-ray laser. The compilation consists of two parts: (1) a listing of selected gamma rays emanating from an isomeric state and (2) a listing of selected gamma rays following the decay of an energy level close to the isomeric state. The compilation is based on the latest “Nuclear Data Sheets” (Ref. 1) for each A-chain available on 1 January 1987. 相似文献
20.
Studies on the analytical potential energy function of diatomic molecular ion XY~+ using variational method 总被引:5,自引:0,他引:5
LIU Guoyue SUN Weiguo & FENG Hao . Institute of Physics Sichuan University Chengdu China . College of Chemical Engineering Sichuan University Chengdu China . Mianyang Teacher抯 College Mianyang China Correspondence should be addressed to Sun Weiguo 《中国科学G辑(英文版)》2004,47(2)
It is well-known that the accurate behavior of potential energy function of molecular ion plays an important role in the studies such as solution chemistry, atmosphere chemistry, nebular medium, plasma physics, and gun powder, etc.[1, 2]. The values of potential energy function of diatomic molecular ion could significantly influence the optical efficiency of laser pump using ion vapors as working substrate[3]. The ionic potential is very important for the studies on low-energy ion-atom collisi… 相似文献