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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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publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C - Nuclear Physics
volume
64
issue
5
article number
054313
publisher
American Physical Society
external identifiers
  • wos:000172077000022
  • scopus:14344275142
ISSN
0556-2813
DOI
10.1103/PhysRevC.64.054313
language
English
LU publication?
no
id
ec699f80-a80e-43e8-87e3-7e99198ca8ba (old id 4281637)
date added to LUP
2016-04-01 15:52:23
date last changed
2022-01-28 07:44:08
@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.}},
  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/10.1103/PhysRevC.64.054313}},
  doi          = {{10.1103/PhysRevC.64.054313}},
  volume       = {{64}},
  year         = {{2001}},
}