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Isobaric analog resonances of Mg-31 and the border of the island of inversion

Imai, N.; Mukai, M.; Cederkäll, Joakim LU ; Aghai, H.; Golubev, Pavel LU ; Johansson, H. T.; Kahl, D.; Kurcewics, J.; Teranishi, T. and Watanabe, Y. X. (2014) In Physical Review C (Nuclear Physics) 90(1).
Abstract
The evolution of the nuclear shell structure in the region of the neutron-rich shell-breaking nucleus Mg-32 has been the subject of considerable interest. We present here the first determination of the overlap of the ground and two first excited states in Mg-31 with a neutron coupled to the ground state in Mg-30 based on studies of its isobaric analog resonances in Al-31. The excitation function for proton resonant elastic scattering on Mg-30 was measured close to 0 degrees in the laboratory frame by bombarding a thick polyethylene target with a Mg-30 beam at an energy of 2.92 MeV/nucleon at the REX-ISOLDE facility at CERN. Three resonances were successfully resolved, and angular momenta and total and proton resonance widths were... (More)
The evolution of the nuclear shell structure in the region of the neutron-rich shell-breaking nucleus Mg-32 has been the subject of considerable interest. We present here the first determination of the overlap of the ground and two first excited states in Mg-31 with a neutron coupled to the ground state in Mg-30 based on studies of its isobaric analog resonances in Al-31. The excitation function for proton resonant elastic scattering on Mg-30 was measured close to 0 degrees in the laboratory frame by bombarding a thick polyethylene target with a Mg-30 beam at an energy of 2.92 MeV/nucleon at the REX-ISOLDE facility at CERN. Three resonances were successfully resolved, and angular momenta and total and proton resonance widths were determined by using R-matrix analysis. The deduced spectroscopic factor for the ground state in Mg-31 is consistent with the shell-model calculation, whereas those for the first and second excited states could not be reproduced. These results show that a drastic change in structure occurs between Mg-30 and Mg-31 and that the onset of structural change in this region therefore occurs between these two isotopes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C (Nuclear Physics)
volume
90
issue
1
publisher
American Physical Society
external identifiers
  • wos:000339919800001
  • scopus:84905178839
ISSN
0556-2813
DOI
10.1103/PhysRevC.90.011302
language
English
LU publication?
yes
id
56aa0f14-5afb-4c6e-bfd5-86a768c1e41f (old id 4667839)
date added to LUP
2014-09-24 16:09:26
date last changed
2017-01-01 06:00:13
@article{56aa0f14-5afb-4c6e-bfd5-86a768c1e41f,
  abstract     = {The evolution of the nuclear shell structure in the region of the neutron-rich shell-breaking nucleus Mg-32 has been the subject of considerable interest. We present here the first determination of the overlap of the ground and two first excited states in Mg-31 with a neutron coupled to the ground state in Mg-30 based on studies of its isobaric analog resonances in Al-31. The excitation function for proton resonant elastic scattering on Mg-30 was measured close to 0 degrees in the laboratory frame by bombarding a thick polyethylene target with a Mg-30 beam at an energy of 2.92 MeV/nucleon at the REX-ISOLDE facility at CERN. Three resonances were successfully resolved, and angular momenta and total and proton resonance widths were determined by using R-matrix analysis. The deduced spectroscopic factor for the ground state in Mg-31 is consistent with the shell-model calculation, whereas those for the first and second excited states could not be reproduced. These results show that a drastic change in structure occurs between Mg-30 and Mg-31 and that the onset of structural change in this region therefore occurs between these two isotopes.},
  articleno    = {011302},
  author       = {Imai, N. and Mukai, M. and Cederkäll, Joakim and Aghai, H. and Golubev, Pavel and Johansson, H. T. and Kahl, D. and Kurcewics, J. and Teranishi, T. and Watanabe, Y. X.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Isobaric analog resonances of Mg-31 and the border of the island of inversion},
  url          = {http://dx.doi.org/10.1103/PhysRevC.90.011302},
  volume       = {90},
  year         = {2014},
}