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Johnson T.D.,Brookhaven National Laboratory | Symochko D.,Ukrainian Academy of Sciences | Fadil M.,Ganil | Tuli J.K.,Brookhaven National Laboratory
Nuclear Data Sheets

The 2000 Nuclear Data Sheets for A=142 by J. K. Tuli, with literature cutoff date of February 4, 2000, has been revised. The evaluated experimental data are presented for 16 known nuclides of mass 142 (Ba, Ce, Cs, Dy, Eu, Gd, Ho, I, La, Nd, Pm, Pr, Sm, Tb, Te, Xe). Comparing to the previous evaluation (2000Tu01) significant changes were done to the level schemes of Gd, Cs, Ce and Nd. For all nuclides, the more recent Q values have been added. © 2011 Elsevier Inc. Source

Borella A.,European Commission | Borella A.,Belgian Nuclear Research Center | Belgya T.,Hungarian Academy of Sciences | Kopecky S.,European Commission | And 4 more authors.
Nuclear Physics A

Gamma-ray transitions following neutron capture in 209Bi have been studied at the cold neutron beam facility of the Budapest Neutron Centre. Measurements have been performed using a coaxial HPGe detector with Compton suppression. Partial capture cross sections at a velocity of 2200 m/s (or a neutron energy of 25.3 meV) have been deduced relatively to the one for the 4055 keV transition after thermal neutron capture in 209Bi. This partial cross section of (8.07 ± 0.14) mb has in turn been obtained from measurements with a bismuth nitrate target relatively to the cross section for the 1884 keV transition after thermal neutron capture in 14N. Shell model calculations have been performed to deduce the half-life of the 3rd excited state at 320 keV and to assign the M1 multipolarity of the 320 keV transition to the ground state. Lower limits of (21.4 ± 0.8) mb and (18.2 ± 0.7) mb for the cross sections to the ground state and to the isomeric state, respectively, have been deduced from the data for the gamma rays feeding these states. The results obtained in this work are in good agreement with experimental data reported in the literature. The thermal total capture cross section has been compared with the contribution due to observed s-wave resonances. © 2010 Elsevier B.V. Source

Scamps G.,Ganil | Scamps G.,Tohoku University | Sargsyan V.V.,Yerevan State University | Adamian G.G.,Joint Institute for Nuclear Research | And 2 more authors.
Physical Review C - Nuclear Physics

Employing the known experimental fact that the sub-barrier capture (fusion) enhancement in the reactions Ca40+Zr94,96 and Ca40+Sn116,124,132 is not proportional to the magnitudes of Q values for the neutron transfer, the similarity of the structure of the target nuclei, and the conservation of the total reaction flux, we analyze the dependence of a few-neutron transfer probability on the magnitudes of Q values. This analysis is checked by the calculations of nucleon transfer probabilities within the time-dependent Hartree-Fock plus BCS approach. © 2015 American Physical Society. Source

Lhersonneau G.,Ganil | Pfeiffer B.,Mainz University | Kratz K.-L.,Mainz University
Hyperfine Interactions

We review structure data obtained by decay spectroscopy of neutron-rich nuclei of mass close to 100. Emphasis is put on the contribution of experiments at IGISOL in the nineties. They confirmed the earlier postulated shape coexistence in the fast shape-transition region between N = 58 (spherical ground states and low collectivity) and N = 60 (strong axial deformation). A detailed spectroscopic study of the A = 99 chain established the upper-Z limit of the N = 56 shell closure region with 99Nb, owing to striking similarities with 97Y. A consequence of the N = 56 closure is that the s 1/2 odd-neutron becomes the ground state of the most neutron-rich N = 57 isotones, starting with 99Mo, instead of the degenerated d 5/2 and g 7/2 subshells familiar in the tin region. Consequences on the change of spin on astrophysical r-process calculations are briefly discussed. Finally, we say a few words about neutron-rich rhodium and palladium isotopes near the neutron midshell where regular and intruder states coexist very close to each other. © 2012 Springer Science+Business Media B.V. Source

Sargsyan V.V.,Yerevan State University | Scamps G.,Ganil | Adamian G.G.,Joint Institute for Nuclear Research | Antonenko N.V.,Joint Institute for Nuclear Research | Lacroix D.,University Paris - Sud
Physical Review C - Nuclear Physics

Sub-barrier capture reactions following neutron-pair transfer are proposed to be used for the indirect study of the neutron-neutron correlation in the surface region of a nucleus. The strong effect of dineutron-like cluster transfer stemming from the surface of magic and nonmagic nuclei 18O, 48Ca, 64Ni, 94,96Mo, 100,102,104Ru, 104 ,106,108Pd, and 112,114,116 ,118,120,124,132Sn is demonstrated. The dominance of the two-neutron transfer channel in the vicinity of the Coulomb barrier is further supported by time-dependent mean-field approaches. © 2013 American Physical Society. Source

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