共查询到20条相似文献,搜索用时 15 毫秒
1.
Y. Terrien J.L. Escudié M. Buenerd J.M. Loiseaux P. Martin J.B. Viano 《Physics letters. [Part B]》1973,45(3):235-237
A (p, p′) scattering experiment at Ep = 40 MeV was performed on the targets 92Mo and 116, 120, 124Sn. The addition of a simple collective imaginary from factor to the microscopic real form factor provides an important improvement in the agreement between calculated and experimental cross sections for the lowest 2+ and 3? states. Results concerning the ΔT = 1 and ΔT = 0 contributions to the transitions are discussed. 相似文献
2.
《Nuclear Physics A》1997,614(2):217-237
The properties of the giant-dipole resonance (GDR) are calculated as a function of excitation energy, angular momentum, and the compound nucleus particle decay width in the nuclei 120Sn and 208Pb, and are compared with recent experimental data. Differences observed in the behavior of the full-width-at-half-maximum of the GDR for 120Sn and 208Pb are attributed to the fact that shell corrections in 208Pb are stronger than in 120Sn, and favor the spherical shape at low temperatures. The effects shell corrections have on both the free energy and the moments of inertia are discussed in detail. At high temperature, the FWHM in 120Sn exhibits effects due to the evaporation width of the compound nucleus, while these effects are predicted for 208Pb. 相似文献
3.
An imaginary potential with universal normalization for dissipative processes in heavy-ion reactions
D. Pereira J. Lubian J.R.B. Oliveira D.P. de Sousa L.C. Chamon 《Physics letters. [Part B]》2009,670(4-5):330-335
In this work we present new coupled channel calculations with the São Paulo potential (SPP) as the bare interaction, and an imaginary potential with system and energy independent normalization that has been developed to take into account dissipative processes in heavy-ion reactions. This imaginary potential is based on high-energy nucleon interaction in nuclear medium. Our theoretical predictions for energies up to ≈100 MeV/nucleon agree very well with the experimental data for the p,n+nucleus, 16O + 27Al, 16O + 60Ni, 58Ni + 124Sn, and weakly bound projectile 7Li + 120Sn systems. 相似文献
4.
Y. Terrien 《Nuclear Physics A》1973,215(1):29-44
The inelastic scattering of protons from the lowest 2+ and 3? levels in 40Ca, Ni, Sn and N = 50 isotopes is analyzed for different incident proton energies. The addition of a collective imaginary term to the microscopic real form factor very much improves the agreement between the calculated and experimental cross section angular distributions. The variation with energy of the relative contributions of the ΔT = 1 and gDT = 0 isospin parts of the transitions is discussed. 相似文献
5.
A microscopic complex folding-model potential that reproduces the scattering amplitude of Glauber-Sitenko theory in its optical limit is obtained. The real and imaginary parts of this potential are dependent on energy and are determined by known data on the nuclear-density distributions and on the nucleon-nucleon scattering amplitude. For the real part, use is also made of a folding potential involing effective nucleon-nucleon forces and allowing for the nucleon-exchange term. Three forms of semimicroscopic optical potentials where the contributions of the template potentials—that is, the real and the imaginary folding-model potential—are controlled by adjusting two parameters are constructed on this basis. The efficiency of these microscopic and semimicroscopic potentials is tested by means of a comparison with the experimental differential cross sections for the elastic scattering of heavy ions 16O on nuclei at an energy of E ~ 100 MeV per nucleon. 相似文献
6.
J. Rapaport Mohammed Mirzaa H. Hadizadeh D.E. Bainum R.W. Finlay 《Nuclear Physics A》1980,341(1):56-74
Accurate measurements of neutron differential elastic cross sections have been obtained from even isotopes of Sn. Data are presented for the elastic scattering of 11 MeV neutrons from 116, 118, 120, 122, 124Sn, the elastic scattering for 24 MeV neutrons from 116, 118, 124Sn and the neutron total cross section from 118, 120, 122, 124Sn in the energy ranges 5.0–10.6 MeV and 20.0–26.0 MeV. The elastic scattering data are analyzed in terms of an empirical optical-model potential. The obtained optical-potential parameters are analyzed in terms of energy and isospin dependence and compared with those obtained from proton elastic scattering on even Sn isotopes. 相似文献
7.
H. Spieler H. J. Körner K. E. Rehm M. Richter H. P. Rother 《Zeitschrift für Physik A Hadrons and Nuclei》1976,278(3):241-250
The reactions120Sn+72 MeV18O and122Sn+74 MeV16O were investigated with time of-flightΔE-E-telescopes. Data are presented for all quasi-elastic reaction channels. The two neutron stripping and pickup reactions (18O,16O), (18O,20O) and (16O,18O) are analyzed in detail. It is shown that these heavy ion induced two neutron transfer reactions proceed with essentially the same type of selectivity as the corresponding light ion induced reactions. The differential cross sections for transfer reactions leaving the120, 122Sn nuclei in their 2+ first excited states are shown to be influenced by interference effects due to additional inelastic excitations. 相似文献
8.
P. F. Bortignon F. Barranco R. A. Broglia G. Colò E. Vigezzi 《Physics of Atomic Nuclei》2004,67(9):1640-1644
We calculate, for the first time, the state-dependent pairing gap of a finite nucleus (120Sn) diagonalizing the bare nucleon-nucleon potential (Argonne v14) in a Hartree-Fock basis. The resulting gap accounts for about half of the experimental gap. Going beyond the mean field in the particle-particle channel, the combined effect of the bare nucleon-nucleon potential and of the induced pairing interaction arising from the exchange of low-lying surface vibrations between nucleons moving in time reversal states close to the Fermi energy accounts for the experimental gap. Examples for light, halo nuclei are also reported. The more studied effects of the particle-vibration coupling in the particle-hole channel are discussed for the low-lying quadrupole vibration in 120Sn and the giant dipole resonance in the unstable oxygen isotopes and 132Sn. 相似文献
9.
A. S. Danagulyan J. Adam A. R. Balabekyan V. G. Kalinnikov V. I. Stegailov V. K. Rodionov V. I. Fominikh J. Frana 《Physics of Atomic Nuclei》2000,63(2):151-155
The cross sections for the production of 7Be, 22Na, 24Na, 28Mg, 38S, 38Cl, and 39Cl nuclei from 112Sn, 118Sn, 120Sn, and 124Sn targets irradiated with 0.6-, 1.0-, and 8.1-GeV protons were measured by the method of induced activity. In analyzing resulting data, it was established that the above nuclei are produced in the fragmentation process and that the reaction cross section is a power-law function of the mass and charge numbers of fragmentation products. A strong dependence of the reaction cross section on the nucleonic composition of the targets and of the products is observed. The measured cross sections, together with data available in the literature, are discussed within various assumptions. 相似文献
10.
The fusion cross-sections of 58,64Ni + 124,132Sn are investigated through a coupled-channel approach using a density- and energy-dependent effective Brueckner G-matrix interaction. Microscopic Skyrme-Hartree-Fock proton and neutron density distributions are used in the calculations. A good agreement with the experimental data of the fusion cross-sections of these neutron-rich systems has been obtained, which favors the present microscopic approach for calculating the interaction potentials and fusion cross-sections. 相似文献
11.
12.
K. V. Lukyanov E. V. Zemlyanaya V. K. Lukyanov A. N. Antonov M. K. Gaidarov 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(6):854-858
Data on cross sections for the 6He + p elastic scattering at energies of tens of MeV/nucleon are analyzed by calculating the microscopic optical potential (OP) (its real and imaginary parts). The effect produced on the cross section by the dependence of the nucleon-nucleon potential on the nuclear matter density, the role of the spin-orbit interaction, and the role of nonlinearity and renormalization of the microscopic OP are studied. A comparison with the experimental data allows sensitivity of cross sections to these effects to be tested. 相似文献
13.
Awad A. Ibraheem M. A. Hassanain S. R. Mokhtar M. A. Zaki Zakaria M. M. Mahmoud M. El-Azab Farid 《Physics of Atomic Nuclei》2012,75(8):969-972
Microscopic folding calculations based upon the effective M3Y nucleon-nucleon interaction and the nuclearmatter densities of the interacting nuclei have been carried out to explain recently measured experimental data of the 6He+120Sn elastic scattering cross section at four different laboratory energies near the Coulomb barrier. The extracted reaction cross sections are also considered. 相似文献
14.
K. V. Lukyanov E. V. Zemlyanaya V. K. Lukyanov I. N. Kukhtina Yu. E. Penionzhkevich Yu. G. Sobolev 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(3):356-360
The experimental data on the total cross sections of the 4, 6He, 6, 7Li + 28Si reactions at energies E=5−50 A MeV are reported. The data for the 6Li, 6He + 28Si reactions have been analyzed within the microscopic model of double-folding optical potential, in which the real and imaginary
parts are calculated at different densities of the projectile nucleus. The cross sections calculated with the microscopic
double-folding Coulomb potential and the standard Coulomb potential for uniform charge distribution are compared with each
other. Semimicroscopic potentials providing agreement with experimental data have been constructed on the basis of renormalized
microscopic potentials and their derivatives, added to take into account collective effects.
Original Russian Text ¢ K.V. Lukyanov, E.V. Zemlyanaya, V.K. Lukyanov, I.N. Kukhtina, Yu.E. Penionzhkevich, Yu.G. Sobolev,
2008, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2008, Vol. 72, No. 3, pp. 382–386. 相似文献
15.
16.
H. Spieler H. J. K?rner K. E. Rehm M. Richter H. P. Rother 《Zeitschrift für Physik A Hadrons and Nuclei》1976,53(5):241-250
The reactions120Sn+72 MeV18O and122Sn+74 MeV16O were investigated with time of-flightE-E-telescopes. Data are presented for all quasi-elastic reaction channels. The two neutron stripping and pickup reactions (18O,16O), (18O,20O) and (16O,18O) are analyzed in detail. It is shown that these heavy ion induced two neutron transfer reactions proceed with essentially the same type of selectivity as the corresponding light ion induced reactions. The differential cross sections for transfer reactions leaving the120, 122Sn nuclei in their 2+ first excited states are shown to be influenced by interference effects due to additional inelastic excitations. 相似文献
17.
Isospin splitting of nucleon effective mass and symmetry energy in isotopic nuclear reactions
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Ya-Fei Guo Peng-Hui Chen Fei Niu Hong-Fei Zhang Gen-Ming Jin Zhao-Qing Feng 《中国物理C(英文版)》2017,41(10):104104-104104
Within an isospin and momentum dependent transport model, the dynamics of isospin particles(nucleons and light clusters) in Fermi-energy heavy-ion collisions are investigated for constraining the isospin splitting of nucleon effective mass and the symmetry energy at subsaturation densities. The impacts of the isoscalar and isovector parts of the momentum dependent interaction on the emissions of isospin particles are explored, i.e., the mass splittings of m_n~*=m_p~* and m_n~* m_p~*(m_n~* m_p~*). The single and double neutron to proton ratios of free nucleons and light particles are thoroughly investigated in the isotopic nuclear reactions of ~(112)Sn+~(112)Sn and ~(124)Sn+~(124)Sn at incident energies of 50 and 120 MeV/nucleon, respectively. It is found that both the effective mass splitting and symmetry energy impact the kinetic energy spectra of the single ratios, in particular at the high energy tail(larger than 20 Me V). The isospin splitting of nucleon effective mass slightly impacts the double ratio spectra at the energy of 50 MeV/nucleon. A soft symmetry energy with stiffness coefficient of γ_s =0.5 is constrained from the experimental data with the Fermi-energy heavy-ion collisions. 相似文献
18.
19.
Robert Clanget 《Applied Physics A: Materials Science & Processing》1973,2(5):247-256
Thin films of In2O3 are prepared by the spraying method. The concentration of charge carriers is changed from about 8×1019 cm?3 to 5×1020 cm?3 by suitable doping with Sn. The optical effective mass is found to depend slightly on carrier concentration. Electrical and optical measurements indicate that electrons are scattered predominantly by charged impurity centres. Structural investigations show that grain boundary scattering can be neglected. The interpretation of the experimental results is mainly based on a paper by von Baltz and Escher, where analytical formulas for the imaginary part of the complex dielectric constant are given for the most important scattering mechanisms in (degenerate) semiconductors. 相似文献
20.
《Nuclear Physics A》1988,486(1):152-178
Angular distributions of the cross sections and analyzing powers up to third rank have been measured for the one-neutron transfer reactions 26Mg(7Li,6Li)27Mg, 120Sn(7Li,6Li)121Sn and 120Sn(7Li, 8Li)129Sn initiated by polarized 7Li ions of 44 MeV. Third-rank analyzing power has been measured for the first time in transfer reactions. Coupled-channels calculations in which the ground and first excited states of 7Li are coupled together by collective interactions and one-neutron transfers are calculated in exact finite range explain the experimental data for low-lying states in final nuclei. Extracted spectroscopic factors are in good agreement with those obtained from other one-neutron transfer reactions on the same targets. 相似文献