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Decay spectroscopy of neutron-rich nuclei with A ≃ 100
Abstract : 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 g7/2 subshells familiar in the tin region. Consequences on the change of spin on astrophysical rprocess calculations are briefly discussed. Finally, we say a few words about neutronrich rhodium and palladium isotopes near the neutron midshell where regular and intruder states coexist very close to each other.
Mots-clés :
Gamma transitions and level energies
90 ≤ A ≤ 149
http://hal.in2p3.fr/in2p3-00997722
Contributor : Michel Lion <>
Submitted on : Wednesday, May 28, 2014 - 3:57:56 PM
Last modification on : Thursday, February 1, 2018 - 1:33:25 AM
Contributor : Michel Lion <>
Submitted on : Wednesday, May 28, 2014 - 3:57:56 PM
Last modification on : Thursday, February 1, 2018 - 1:33:25 AM