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Intruder features in the island of inversion: The case of Mg-33

Nummela, S; Nowacki, F; Baumann, P; Caurier, E; Cederkäll, Joakim LU ; Courtin, S; Dessagne, P; Jokinen, A; Knipper, A and Le Scornet, G, et al. (2001) In Physical Review C (Nuclear Physics) 64(5).
Abstract
The Na-33 beta decay was studied online using mass separation techniques and a first description of the level structure of the neutron-rich isotope Mg-33, with N=21, has been obtained. The experiment involved the measurement of beta-gamma, beta-gamma-gamma, and beta -n-gamma coincidences as well as neutron spectra by time-of-flight technique. The first low energy level scheme for the daughter nucleus Mg-33 is given with five bound states. Spin and parity assignments are proposed according to beta feedings and gamma -ray multipolarities, beta -strength distribution is evaluated, taking into account 1n- and 2n-emission channels and it is compared with the calculated GT strength distribution. In particular, the 1p-1h and 2p-2h excitations are... (More)
The Na-33 beta decay was studied online using mass separation techniques and a first description of the level structure of the neutron-rich isotope Mg-33, with N=21, has been obtained. The experiment involved the measurement of beta-gamma, beta-gamma-gamma, and beta -n-gamma coincidences as well as neutron spectra by time-of-flight technique. The first low energy level scheme for the daughter nucleus Mg-33 is given with five bound states. Spin and parity assignments are proposed according to beta feedings and gamma -ray multipolarities, beta -strength distribution is evaluated, taking into account 1n- and 2n-emission channels and it is compared with the calculated GT strength distribution. In particular, the 1p-1h and 2p-2h excitations are shown to result in substantial contribution to the low energy configurations. Allowed beta branch to the (33)Ma g.s. [log ft = 5.27(26)] gives direct evidence for the inversion of nu (f(7/2)) and nu (d(3/2)) states. (Less)
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Physical Review C (Nuclear Physics)
volume
64
issue
5
publisher
American Physical Society
external identifiers
  • wos:000172077000022
  • scopus:14344275142
ISSN
0556-2813
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language
English
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ec699f80-a80e-43e8-87e3-7e99198ca8ba (old id 4281637)
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@article{ec699f80-a80e-43e8-87e3-7e99198ca8ba,
  abstract     = {The Na-33 beta decay was studied online using mass separation techniques and a first description of the level structure of the neutron-rich isotope Mg-33, with N=21, has been obtained. The experiment involved the measurement of beta-gamma, beta-gamma-gamma, and beta -n-gamma coincidences as well as neutron spectra by time-of-flight technique. The first low energy level scheme for the daughter nucleus Mg-33 is given with five bound states. Spin and parity assignments are proposed according to beta feedings and gamma -ray multipolarities, beta -strength distribution is evaluated, taking into account 1n- and 2n-emission channels and it is compared with the calculated GT strength distribution. In particular, the 1p-1h and 2p-2h excitations are shown to result in substantial contribution to the low energy configurations. Allowed beta branch to the (33)Ma g.s. [log ft = 5.27(26)] gives direct evidence for the inversion of nu (f(7/2)) and nu (d(3/2)) states.},
  articleno    = {054313},
  author       = {Nummela, S and Nowacki, F and Baumann, P and Caurier, E and Cederkäll, Joakim and Courtin, S and Dessagne, P and Jokinen, A and Knipper, A and Le Scornet, G and Lyapin, LG and Miehe, C and Oinonen, M and Poirier, E and Radivojevic, Z and Ramdhane, M and Trzaska, ZH and Walter, G and Aysto, J},
  issn         = {0556-2813},
  language     = {eng},
  number       = {5},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Intruder features in the island of inversion: The case of Mg-33},
  url          = {http://dx.doi.org/},
  volume       = {64},
  year         = {2001},
}