Decay spectroscopy of neutron-rich nuclei with A $\simeq$ 100 - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Hyperfine Interactions Year : 2014

Decay spectroscopy of neutron-rich nuclei with A $\simeq$ 100

B. Pfeiffer
  • Function : Author
K.-L. Kratz
  • Function : Author

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 s1/2 odd-neutron becomes the ground state of the most neutron-rich N = 57 isotones, starting with 99Mo, instead of the degenerated d5/2 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.
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in2p3-00769613 , version 1 (02-01-2013)

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G. Lhersonneau, B. Pfeiffer, K.-L. Kratz. Decay spectroscopy of neutron-rich nuclei with A $\simeq$ 100. Hyperfine Interactions, 2014, 223, pp.137-146. ⟨10.1007/s10751-012-0609-4⟩. ⟨in2p3-00769613⟩
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