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1.
The (p-d-t) process in 48Ca(p, t)48Ca(p, t)46Ca(0+, g.s.; 2+, 1.34 MeV) and 116Sn(p, t)114Sn(0+, g.s.) at 20 MeV was investigated. The calculations showed that the two-step process is important in all the transitions investigated, and is enhanced in the Sn transition by the pairing correlations in the BCS ground states. 相似文献
2.
H.Y. Zhang W.Q. Shen Y.G. Ma X.Z. Cai D.Q. Fang L.P. Yu C. Zhong Y.B. Wei 《The European Physical Journal A - Hadrons and Nuclei》2002,15(3):399-404
The directed and elliptic flows for different light particles and fragments in collisions of 40Ca + 40Ca and 112Sn + 112Sn at energies from 30MeV/nucleon to 100MeV/nucleon were studied in the isospin-dependent quantum molecule dynamics model
(IQMD). With increasing incident energy, the directed flow rises from negative to positive, while the elliptic flow decreases
with increasing the incident energies. The directed flow for the 40Ca + 40Ca system is not sensitive to the nuclear equation of states (EOS), but the directed flow for the 112Sn + 112Sn system is sensitive to the EOS. However, the elliptic flows for both 40Ca + 40Ca and 112Sn + 112Sn systems are not sensitive to EOS. A study of the dependence of directed and elliptic flows on the fragment charge (mass)
is also performed.
Received: 15 March 2002 / Accepted: 14 June 2002 / Published online: 19 November 2002
RID="a"
ID="a"e-mail: Zhanghy@sinr.ac.cn; Permanent address: Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, P.O. Box 800-204(2), Shanghai 201800, China.
Communicated by W. Henning 相似文献
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K. Yagi Y. Aoki C. Rangacharyulu K. Matoba M. Hyakutake J. Nidome 《Physics letters. [Part B]》1973,44(5):447-448
Differential cross sections of (p, t) reactions exciting the 2+1 states in Te (A = 128 ? 120), Sn (116 and 114) and Cd (114 and 112) have been measured at Ep = 52 MeV. The observed differences of the angular distributions are interpreted by taking into account the two-step processes through inelastic scattering channels. 相似文献
6.
Excitation functions of the 40Ca(d, p)41Ca and 40Ca(d, d)40Ca reactions have been measured at 45°, 90°, 135° and 170° from Ed = 4.50 to 5.43 MeV in 10 keV steps. Angular distributions of these reactions have been taken at Ed = 4.70, 5.00 and 5.30 MeV from 25° to 170° in 5° steps. Transitions were observed to the excited states for the range 0.0 ≦ Ex ≦ 3.74 MeV in 41Ca. Rapid fluctuations in the excitation functions and strong variations of the angular distributions with the incident energy were observed, suggesting that the contribution from compound nucleus processes is very large. Various quantities extracted from the experimental data were compared to the predictions of the statistical theories combined with the DWBA theory for the calculation of the direct reaction amplitudes. The results of the present analysis are consistent with the predictions of the standard statistical theories based on the neglect of the channel-channel correlation. 相似文献
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C. Foin A. Gizon J. Genevey J. Gizon P. Paris F. Farget D. Santos D. Barnéoud A. Płochocki 《The European Physical Journal A - Hadrons and Nuclei》2002,14(1):7-11
A high-spin level structure of the nucleus 154Tm has been established for the first time up to 6.14 MeV. The 118Sn + 40Ca reaction at 205 MeV associated with the recoil shadow method was used to identify the I
π = (19)+ isomeric state at 2.74 MeV. In-beam γ-ray and conversion electron spectroscopy have been applied on the 144Sm(14N, 4n)154Tm reaction at 95 MeV to build the level scheme. The level structure of 154Tm is compared to other structures observed in N = 85 neighbouring nuclei.
Received: 4 January 2002 / Accepted: 15 March 2002 相似文献
9.
《Nuclear Physics A》1999,653(4):341-354
Reaction cross sections for 65.5 MeV protons have been measured for 9Be, 12C, 16O, 28Si, 40Ca, 58,60Ni, 112.116.118.120.124Sn, and 208Pb. The results are compared with optical model predictions using relativistic global potentials. 相似文献
10.
I. Lombardo C. Agodi R. Alba F. Amorini A. Anzalone L. Auditore I. Berceanu G. Cardella S. Cavallaro M. B. Chatterjee E. De Filippo A. Di Pietro P. Figuera G. Giuliani E. Geraci L. Grassi A. Grzeszczuk J. Han E. La Guidara G. Lanzalone N. Le Neindre D. Loria C. Maiolino A. Pagano M. Papa S. Pirrone G. Politi A. Pop F. Porto F. Rizzo P. Russotto D. Santonocito A. Trifirò M. Trimarchi G. Verde M. Vigilante 《Physics of Atomic Nuclei》2011,74(11):1562-1566
Isospin dependence of dynamical and thermodynamical properties observed in reactions 40Ca+ 40,48Ca and 40Ca + 46Ti at 25 MeV/nucleon has been studied. We used the CHIMERA multi-detector array. Strong isospin effects are seen in the isotopic distributions of light nuclei and in the competition between different reaction mechanisms in semi-central collisions. We will show also preliminary results obtained in nuclear collision 48Ca + 48Ca at 25MeV/nucleon, having very high N/Z value in the entrance channel (N/Z = 1.4). The enhancement of evaporation residue production confirms the strong role played by the N/Z degree of freedom in nuclear dynamics. 相似文献
11.
《Nuclear Physics A》1999,652(4):391-405
Measurements have been made of the 96Zr(p,γ)97Nb, 112Sn(p,γ)113Sb, and 119Sn(p,γ)120Sb cross section excitation functions. Incident proton energies ranged from 2.8 MeV to 8.5 MeV. These reactions are relevant to several processes of stellar nucleosynthesis. The resulting astrophysical S-factors are compared to those from theoretical statistical model calculations using the SMOKER, and the more recent NON-SMOKER, codes to judge their applicability to these reactions. 相似文献
12.
Angular distributions of the neutron polarization produced in (d, n) reactions on 24Mg and 28Si were obtained in about 300 keV steps from 3.9 MeV down to 2.2 and 2.9 MeV, respectively. Excitation functions of the polarization were measured at 20° and 40° (lab) over these energy ranges. Polarization angular distributions were also measured for (d, n) reactions on 28Si at 8.1 MeV and 40Ca at 3.8 MeV. DWBA calculations are compared to the latter distributions as well as to the (d, n) cross-section data. Fluctuations in the low-energy polarization d ata from the 24Mg and 28Si targets made DWBA comparison of questionable value. 相似文献
13.
Isospin Effect on Relative State Population Temperature in the Reactions 40Ar+ 112,124Sn at 30MeV/u
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HU Rong-Jiang WU He-Yu ZHU Yong-Tai JIN Gen-Ming DUAN Li-Min XIAO Zhi-Gang WANG Hong-Wei LI Zu-Yu WANG Su-Fang ZHANG Bao-Guo WEI Zhi-Yong LU Zhao-Hui ZHU Hai-Dong FENG Zhao-Qing YUAN Xiao-Hua 《中国物理C(英文版)》2004,28(2):152-157
An array of 13 detector telescopes has been used for detecting small-angle particle-particle correlations in the reactions 40Ar+112,124Sn at 30MeV/u. The α-α correlation functions were extracted from two-particle coincident events. A three-body trajectory code MENEKA was used to calculate the background correlation function. The detection efficiency was calculated by using the Monte-Carlo method. After subtracting the background correlation and making the detection efficiency correction, the temperatures of 4.18±0.25 0.21 MeV and 4.10±0.22 0.20MeV are obtained from relative populations of 8Be states for the reaction systems with different isospin,40Ar+112Sn and 40Ar+124Sn, respectively. From the relationship between the state population temperature and outgoing particle energies, it is found that the emission temperature decreases with increase of the particle energies for both studied reaction systems. For the neutron deficient system 40Ar+112Sn the emission temperature is 5.13±0.30 0.26MeV for the lower emitting particle energies and 3.87±0.37 0.29MeV for the higher emitting particle energies. And for the neutron rich system 40Ar+124Sn the emission temperature is 5.39±0.30 0.26MeV for the lower emitting particle energies and 3.32± 0.28 0.23MeV for the higher emitting particle energies. This kind of isospin dependence is discussed. 相似文献
14.
Excitation functions of elastic and inelastic scattering of protons on 40Ca have been measured for incident proton energies between 4.8 and 8.2 MeV. Spin and parity assignments and partial width determinations of 41Sc states between 5.8 and 8.7 MeV excitation energy have been made on the basis of quantitative analyses of the data for the different inelastic channels. Intermediate structure has been identified in the excitation function for the inelastic scattering to the 3? (3.73 MeV) state in 40Ca. This has been interpreted as being due to the presence of a state in 41Sc which consists primarily of the core nucleus 40Ca in its 3? state with a 2p particle weakly coupled to it. 相似文献
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S. André C. Foin V. Barci D. Barnéoud J. Genevey A. Gizon 《Zeitschrift für Physik A Hadrons and Nuclei》1990,337(3):349-350
An highspin yrast isomer (T1/2 ? 420ns, E>10.286 MeV, 67/2≤ I≤ 71/2) is observed in the151Er nucleus excited in the116 Sn+40 Ca reaction, using the recoil shadow method. 相似文献
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S. Froneman W. J. Naudé W. A. Richter J. A. Stander J. W. Koen 《Zeitschrift für Physik A Hadrons and Nuclei》1987,327(4):469-480
Properties of levels up to 3.5 MeV in43Sc were studied using40Ca (α, p)43Sc and40Ca(α, pγ)43Sc reactions atE α =12 MeV. Level energies, branching ratios, mean lifetimes, spins and mixing ratios were obtained for a number of levels. Relevant results are compared with many-particle shell-model predictions. 相似文献
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《Nuclear Physics A》1986,457(1):173-181
Angular distributions for the transfer reactions 40Ca(7Li, 6Li)41Ca and 40Ca(7Li, 6He)41Sc have been measured at 34 MeV, in small angular increments out to angles where the cross section has fallen by four orders of magnitude. Finite range DWBA calculations show a high sensitivity to different distorting potentials at the largest angle cross sections. It is found that a combination of Woods-Saxon and double-folded potentials does the best job of reproducing the data over the whole angular range. 相似文献
18.
J. Blachot J. Crançon B. de Goncourt A. Gizon A. Llères 《Zeitschrift für Physik A Hadrons and Nuclei》1985,321(4):645-651
Cross sections, recoil energy distributions for residues produced by14N,20Ne,40Ar on124Sn targets have been measured in the 10–70 MeV/u intermediate energy range. As the projectile energy increases, processes as complete fusion-evaporation, incomplete fusion-evaporation and intranuclear cascade-evaporation participate progressively in the nuclear collisions. Peculiar residues corresponding to a gain of 4, 5 or even 6 protons for the124Sn target have been observed in the 30–50 MeV energy range. 相似文献
19.
Yields of (γ, n) reactions on tin isotopes 124Sn, 118Sn, 114Sn, and 112Sn and yields of (γ, p) reactions on 117Sn, 116Sn, and 112Sn were measured in the present study. The obtained results are compared to those from earlier experiments and theoretical
calculations. The yields of reactions with the production of nuclei in isomeric states are presented. 相似文献
20.
Differential cross sections have been measured for the elastic scattering of 217 MeV 3He particles from 6Li, 9Be, 12C, 28Si, 40Ca, 58Ni, 89Y, 90Zr, 120Sn and 208pb. The data have been analysed with an optical potential. The ambiguities found at lower energies (discrete families of real potential well depths) disappear. An optical potential is also calculated with an effective 3He-N interaction and a matter distribution. The agreement with experiment is good. Some comparisons are made with 166 MeV α-particle elastic scattering data. 相似文献