共查询到19条相似文献,搜索用时 62 毫秒
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A. A. Kurteva V. E. Mitroshin 《Bulletin of the Russian Academy of Sciences: Physics》2011,75(4):580-584
The energies, magnetic dipole and electric quadrupole moments, spectroscopic factors of the ground and excited states of 109Ag and 107Ag, the reduced probabilities of electromagnetic transitions between them, and the reduced probabilities of β transitions
from the ground states of 109Cd and 107Cd to the excited states of 109Ag and 107Ag were calculated on the basis of the dynamic collective model. The vacuum fluctuations of quasiparticles and multiphonon
(up to 10 phonons) states of the main band of the even-even core were taken into account. The calculation results show good
agreement with the experimental data. 相似文献
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本文把用于处理重离子引起的单粒子转移反应的Goldfarb-Buttle方法推广到多粒子转移反应。计算了12C(7Li,t)16O和20Ne(d,6Li)16O反应,用了16O的全相干波函数,考虑了某些反冲因素,并将结果与实验作了比较。 相似文献
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利用能量为170MeV左右的36Ar重离子束轰击96Ru和106Cd浓缩同位素靶,分别生成缺中子同位素130Nd和140Tb.借助氦喷嘴带传输系统,用X–γ和γ–γ符合方法,分离鉴别了这两种核素,并进一步测定了它们的衰变性质.得到130Nd的半衰期为(13±3)s,首次建议了它的EC/β+衰变纲图,推测了其子核130Pr的基态和低位能级的自旋宇称.修订了140Tb的原有极简单的EC/β+衰变纲图并指认140Tb的基态自旋宇称为7+. 相似文献
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In this study,218Ac and 221Th nuclides were produced via the heavy-ion induced fusion evaporation reaction 40Ar+186W.Their decay properties were studied with the help of the gas-filled recoil spectrometer SHANS and a digital data acquisition system.The cross section ratio between 222Pa and 218Ac was extracted experimentally,withmeasured value 0.69(9).Two new possible α decay branches to 221Th are suggested.The valence neutron configurations for the daughter 217Ra are discussed in terms of the hindrance factors. 相似文献
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The resonance states in 16O+16O, 12C+16O, α+16O and α+12C are described using modified Morse potential proposed earlier whose success has already been demonstrated in the case of
12C+12C system. The general validity of such a potential with long range, shallow depth and repulsive soft core determined from
the resonance data itself is being examined through the present study of the resonances in the above four systems. In each
system, the experimental data of a large number of states have been successfully described with a modified Morse potential.
The success points out a common mechanism of the origin of these states, and reaffirms authentically the diatomic-like rotational
and vibrational picture of the nuclear molecular resonances proposed previously. The close resemblance between the physics
of diatomic molecules and nuclear molecular resonances extending to the level of potential which is Morse type in both the
cases — although belong to two different areas of physics — is further strengthened through the present study.
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A.F. Zeller G.T. Hickey D.C. Weisser D.F. Hebbard B.A. Robson 《Nuclear Physics A》1978,301(1):130-140
Reactions induced by 14N on 26Mg at bombarding energies of 60–95 MeV have been studied. Angular distributions for states populated in 29Si by the (14N, 11B) reaction and in 30Si by the (14N, 10B) reaction have been compared with Hauser-Feshbach and DWBA calculations to determine the reaction mechanism and to deduce spectroscopic information. The cross sections for the states populated in 29Si and 30Si are in poor agreement with statistical model calculations, indicating a non-compound nucleus mechanism. 相似文献
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利用同位旋相关的Boltzmann-Langevin方程研究了40Ca+58Fe和40Ca+58Ni两个反应系统在53,100,150和200MeV/u入射能量下对心碰撞的径向膨胀流.发现对于丰中子系统40Ca+58Fe的径向膨胀流系统性地小于稳定系统40Ca+58Ni的径向膨胀流.在假定轰击能量与反应体系的压缩密度呈抛物线关系时,能够解释入射能量和径向膨胀流之间呈现的直线关系.提取了出现径向膨胀流的轰击能量阈值,发现对丰中子系统40Ca+58Fe得到的能量阈值小于稳定系统40Ca+58Ni所得到的能量阈值. 相似文献
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K.G. Bernhardt H. Bohn K.A. Eberhard R. Sielemann R. Vandenbosch M.P. Webb 《Nuclear Physics A》1981,365(1):157-172
Excitation functions for α-emission leading to the ground and first excited states of 26Mg and 8Be emission leading to the ground and first and second excited states of 22Ne have been measured at several forward angles for Ec.m. = 15 to 22.4 MeV. There is little evidence for correlated structure. The angular distribution at 16.5 MeV for the α + 26Mg(g.s.) channel is rather structureless while that for the 8Be+22Ne(g.s.) channel appears to be dominated by a J = 13 contribution. Statistical model calculations indicate that much of the yield for both the α and 8Be exit channel is compound nuclear in origin, with some indication of a larger direct contribution for the 8Be channel at the lower end of the bombarding energy range. 相似文献
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Reactions of 40Ar ions with targets of 159Tb, 142Nd, and 144Sm have been studied at energies below 300 MeV with a helium gas-jet system. Excitation functions for (Ar, xn) reactions, where x = 5–10, were obtained for the radioactive products that decay by α-emission. Based on the characteristics of these excitation functions and on the systematics of α-decay, evidence is presented for the existence of the nuclides 189Bi with α-particle energy Eα = 6.67±0.01 MeV and half-life < 1.5 sec, and 173Pt with Eα = 6.19±0.01 MeV; and for the emission from 177Au of an α-particle with Eα = 6.15±0.01 MeV. 相似文献
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Atomic levels for the systems p? plus 16O, 18O, 32S, 40Ca, 44Ca and 122Sn are calculated in optical potentials based on the N?N interaction of Dover and Richard. 相似文献
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J.P. Bondorf 《Nuclear Physics A》1973,202(1):30-36
The difference between the observed fluctuations in the elastic excitation functions for carbon-carbon and oxygen-oxygen scattering, just above the Coulomb barrier, is interpreted in terms of the compound nucleus model. 相似文献
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H. Yoshida 《Physics letters. [Part B]》1980,93(4):376-378
The effect of 15N excitation process is studied in the reaction 48Ca(16O, 15N)49Sc. The excitation process is included into a generalized non-local optical potential for a scattersing 15N-49Sc and is found to be responsible for a shift of a grazing peak in the exact finite-range DWBA calculation. 相似文献
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The mechanisms involved in the production of fast α-particles in 12C-induced reactions have been studied for the 12C + 208Pb system at the bombarding energies of E12c = 132, 187 and 230 MeV. Absolute cross sections for the reactions 208Pb(12C. 12C1→α + 8Be), 208Pb(12C, 8Be(g.s.)) and 208Pb(12C, 8Be(2.94 MeV)) have been determined by coincidence measurement of two or three correlated α-particles. Inclusive α-particle production cross sections were also measured at E12c = 187 MeV. It is found that the inelastic process (12C, 12C1→α + 8Be) does not contribute significantly to fast α-particle production but that the production of 8Be by projectile fragmentation is an important source of α-particles. At the highest bombarding energy (230 MeV) it appears that the 12C → 3α fragmentation reaction becomes more prominent at the expense of the 12C→α + 8Be fragmentation channel. 相似文献
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Angular distributions have been measured for transitions to low-lying states in 143Pm and 145Eu populated by the 142Nd(7Li, 6He)143 and the 144Sm(7Li, 6He)145Eu reactions at MeV. Elastic scattering of 7Li at 52 MeV on 142Nd and 144Sm, and 6Li at 46 MeV on 142Nd and at 45 MeV on 144Sm, were measured. Optical-model parameters extracted from fits to the scattering data were used in a finite-range DWBA analysis of the angular distributions for levels below 1.40 MeV excitation energy in 143Pm and 1.84 MeV in 145Eu. The reaction cross sections forward of 6° c.m. allow unambiguous distinction to be made between 2d and 2d final states. Final-state spins have been assigned to d-states in 143Pm at 1.40 MeV(+)and in 145Eu at 1.042 MeV (+). Existing assignments to other levels in both residual nuclei have been confirmed. 相似文献