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Sökning: WFRF:(Domingo G) > (2015-2019) > (2018)

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1.
  • Delafosse, C., et al. (författare)
  • Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni-78 Region : A Hint from Lifetime Measurements
  • 2018
  • Ingår i: Physical Review Letters. - : AMER PHYSICAL SOC. - 0031-9007 .- 1079-7114. ; 121:19
  • Tidskriftsartikel (refereegranskat)abstract
    • Lifetime measurements of excited states of the light N = 52 isotones Kr-88, Se-86, and Ge-84 have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B(E2; 2(+)-> 0(+)) and B(E2; 4(+)-> 2(+)) were obtained for the first time for the hard-to-reach 84Ge. While the B(E2; 2(+)-> 0(+) ) values of Kr-88, Se-86 saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g(7/2), 1h(11/2)) space of an inert Ni-78 core, the value obtained for Ge-84 largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N less than or similar to 49, extend beyond N = 50. The onset of collectivity at Z = 32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector rho field in shell-structure evolution.
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  • Praena, J., et al. (författare)
  • Preparation and characterization of 33S samples for 33S(n,alpha)30Si cross-section measurements at the n_TOF facility at CERN
  • 2018
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 890, s. 142-147
  • Tidskriftsartikel (refereegranskat)abstract
    • Thin 33S samples for the study of the 33S(n,alpha)30Si cross-section at the n_TOF facility at CERN were made by thermal evaporation of 33S powder onto a dedicated substrate made of kapton covered with thin layers of copper, chromium and titanium. This method has provided for the first time bare sulfur samples a few centimeters in diameter. The samples have shown an excellent adherence with no mass loss after few years and no sublimation in vacuum at room temperature. The determination of the mass thickness of 33S has been performed by means of Rutherford backscattering spectrometry. The samples have been successfully tested under neutron irradiation.
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  • May, Sally K., et al. (författare)
  • Early Australian Anthropomorphs : Jabiluka's Dynamic Figure Rock Paintings
  • 2018
  • Ingår i: Cambridge Archaeological Journal. - : Cambridge University Press. - 0959-7743 .- 1474-0540. ; 28:1, s. 67-83
  • Tidskriftsartikel (refereegranskat)abstract
    • Early depictions of anthropomorphs in rock art provide unique insights into life during the deep past. This includes human engagements with the environment, socio-cultural practices , gender and uses of material culture. In Australia, the Dynamic Figure rock paintings of Arnhem Land are recognized as the earliest style in the region where humans are explicitly depicted. Important questions, such as the nature and signicance of body adornment in rock art and society, can be explored, given the detailed nature of the human gurative art and the sheer number of scenes depicted. In this paper, we make a case for Dynamic Figure rock art having some of the earliest and most extensive depictions of complex an-thropomorph scenes found anywhere in the world.
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  • Resultat 1-6 av 6

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