Elastic scattering of 12 MeV deuterons on even rare-earth nuclei
Abstract
Elastic scattering differential cross sections for 12 MeV deuterons on 16 nuclei with 144 ≦ A ≦ 208 have been measured in a high-resolution experiment. The experimental results were analysed in terms of the optical model. A systematic variation of the spherical optical-model parameters is explained in terms of the nuclear deformation by averaging a deformed optical potential over the nuclear volume. The optical-model parameters in this mass number region were obtained.
References (7)
- T. Becker et al.
Phys. Lett.
(1963) - E.C. Halbert
Nucl. Phys.
(1964) - J. Borggreen et al.
Nucl. Instr.
(1963)
Cited by (43)
Nuclear Data Sheets for A=164
2018, Nuclear Data SheetsExperimental nuclear structure data for the known A=164 isobaric nuclides (Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir) have been evaluated, and presented together with Adopted properties of level energies, and associated γ rays. The decay data for these nuclides have also been evaluated, providing Adopted values of γ and β radiations, and log ft values.
No excited states are known in 164Eu, 164Tb, and 164Ir. Information for 164Gd, 164Re and 164Os is limited due to insufficient experimental data. For radioactive nuclides, decay schemes of 164Sm, 164Gd and 164Re are not known, and those of 164W, 164Tb, 164Lu, 164Hf, 164Ta and 164W are incomplete. The decay schemes of 164Ho and the two activities of 164Tm seem fairly complete. The decay scheme of 164Yb presents a major problem that the Q(ε) value of 887 keV 29 recommended in 2017Wa10 is in disagreement with the population of levels at 928, 952 and 1060 keV in the daughter nucleus. This decay scheme, which so far has been mainly reported in a secondary reference (1982AdZZ) needs further investigation. Also the masses of 164Yb and 164Tm need either new measurements or a re-evaluation to resolve discrepancy of about 220 keV in the Q value of 164Yb decay to 164Tm.
The reactions and decays for which no new experimental information has become available since the 2001 update have undergone revisions to incorporate conversion coefficients from BrIcc code, and evaluated Q values from 2017Wa10, but the essential content of such datasets may have remained the same as in previous evaluations. In this respect the present work greatly benefited from all the previous NDS evaluations (2001Si27,1992Sh07, 1986Sh03,1974Bu30), but at the same time data presented herein supersede all the previous published evaluations.
Importance of the continuum–continuum couplings in the <sup>6</sup>Li elastic breakup on different target masses
2017, Nuclear Physics AA theoretical study of breakup on target masses ranging from is performed. It is obtained that when continuum–continuum couplings are included in the potential coupling matrix, they substantially reduce the total and nuclear breakup cross sections, while the Coulomb breakup cross sections for the medium and heavy target masses are increased. When these couplings are excluded, we show that the total and nuclear breakup cross sections depend linearly on , namely they decrease linearly as the mass of the target increases. In the same case, the Coulomb breakup cross section depends linearly with the charge of the target (decreases as increases). We found that this linearity is destroyed when these couplings are included. However, in this case, it is the Coulomb-nuclear interference that also depends linearly with the target charge (increase with ).
Nuclear Data Sheets for A=158
2017, Nuclear Data SheetsThe experimental results published before February 2017 from the various reaction and decay studies leading to nuclides 158Nd, 158Pm, 158Sm, 158Eu, 158Gd, 158Tb, 158Dy, 158Ho, 158Er, 158Tm, 158Yb, 158Lu, 158Hf, 158Ta, 158W in the A=158 mass chain have been reviewed. These data are summarized and presented, together with adopted level schemes and properties. Large sections of the mass chain are almost identical to the ones in the previous 2004He05 NDS publication by R.G. Helmer.
Beta decay of the fission product <sup>125</sup>Sb and a new complete evaluation of absolute gamma ray transition intensities
2012, Radiation Physics and ChemistryThe radionuclide 125Sb is a long-lived fission product, which decays to 125Te by negative beta emission with a half-life of 1008 day. The beta decay is followed by the emission of several gamma radiations, ranging from low to medium energy, that can suitably be used for high-resolution detector calibrations, decay heat calculations and in many other applications. In this work, the beta decay of 125Sb has been studied in detail. The complete published experimental data of relative gamma ray intensities in the beta decay of the radionuclide 125Sb has been compiled. The consistency analysis was performed and discrepancies found at several gamma ray energies. Evaluation of the discrepant data was carried out using Normalized Residual and RAJEVAL methods. The decay scheme balance was carried out using beta branching ratios, internal conversion coefficients, populating and depopulating gamma transitions to 125Te levels. The work has resulted in the consistent conversion factor equal to 29.59(13) %, and determined a new evaluated set of the absolute gamma ray emission probabilities. The work has also shown 22.99% of the delayed intensity fraction as outgoing from the 58 d isomeric 144 keV energy level and 77.01% of the prompt intensity fraction reaching to the ground state from the other excited states. The results are discussed and compared with previous evaluations. The present work includes additional experimental data sets which were not included in the previous evaluations. A new set of recommended relative and absolute gamma ray emission probabilities is presented.
Fusion of <sup>6</sup>Li with <sup>152</sup>Sm: Role of projectile breakup versus target deformation
2012, Nuclear Physics AComplete fusion cross sections for 6Li + 152Sm reaction have been measured at beam energies () near the Coulomb barrier. The sub-barrier fusion cross sections were found to be systematically larger than those for 6Li + 144Sm, as expected from the deformed shape of the 152Sm nucleus. The coupled-channels (CC) calculations including both projectile and target couplings overpredict the experimental fusion cross sections at above barrier energies. Reduced fusion cross sections for the present system at above barrier energies are found to be smaller compared to those with tightly-bound projectiles forming similar compound nuclei and also to those predicted using proximity potential. These observations along with the comparison of derived barrier distributions conclude that the complete fusion cross sections at energies above the Coulomb barrier are suppressed by . A large cross section measured for incomplete fusion indicates that the above suppression is due to the loss of incident flux caused by projectile breakup. Thus the effect of both target deformation and projectile breakup are found to coexist.
Nuclear Data Sheets for A = 154
2009, Nuclear Data SheetsThe experimental results from the various reaction and decay studies leading to nuclides in the A = 154 mass chain have been reviewed. These data are summarized and presented, together with adopted level schemes and properties, for the nuclides from Ce(Z = 58) through Hf(Z = 72). This evaluation replaces that of 1998Re22, which appeared in Nuclear Data Sheets 85, 171 (1998).