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Suppression of Gamow-Teller and M1 transitions in deformed mirror nuclei Mg-25 and Al-25 - Direct observation of K selection rules

Shimbara, Y ; Fujita, Y ; Adachi, T ; Berg, GPA ; Fujita, H ; Fujita, K ; Hamamoto-Kuroda, Ikuko LU ; Hatanaka, K ; Kamiya, J and Nakanishi, K , et al. (2004) In European Physical Journal A. Hadrons and Nuclei 19(1). p.25-31
Abstract
The mirror nuclei Mg-25 and Al-25 are expected to have very similar structures. The Gamow-Teller (GT) transitions from the J(pi) = 5/2(+) ground state of Mg-25 to the excited states in Al-25 were studied by high-resolution measurements of the Mg-25(He-3,t) charge-exchange reaction at 0degrees and at 140 MeV/nucleon. Assuming the usual DeltaJ(pi) = 1(+) selection rule for the spin-isospin-type GT transitions, the states with J(pi) = 3/2(+), 5/2(+), and 7/2 (+) should be excited. However, of the more than ten states with these J(pi) values below 6 MeV excitation energy, only the 5/2 (+) ground state and the 7/2 (+) , 1.613 MeV state in Al-25 were strongly populated, while all other states were strongly suppressed. The analysis of M1... (More)
The mirror nuclei Mg-25 and Al-25 are expected to have very similar structures. The Gamow-Teller (GT) transitions from the J(pi) = 5/2(+) ground state of Mg-25 to the excited states in Al-25 were studied by high-resolution measurements of the Mg-25(He-3,t) charge-exchange reaction at 0degrees and at 140 MeV/nucleon. Assuming the usual DeltaJ(pi) = 1(+) selection rule for the spin-isospin-type GT transitions, the states with J(pi) = 3/2(+), 5/2(+), and 7/2 (+) should be excited. However, of the more than ten states with these J(pi) values below 6 MeV excitation energy, only the 5/2 (+) ground state and the 7/2 (+) , 1.613 MeV state in Al-25 were strongly populated, while all other states were strongly suppressed. The analysis of M1 transitions in Mg-25 also suggested a very similar feature for the analogous M1 transitions. Both Mg-25 and Al-25 are known to be largely deformed, and most low-lying states can be interpreted in terms of one-particle quantum numbers in the deformed potential and the associated rotational spectra. The observed suppression can be explained in terms of the K quantum number selection rules that are inherent to axially deformed nuclei. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal A. Hadrons and Nuclei
volume
19
issue
1
pages
25 - 31
publisher
Springer
external identifiers
  • wos:000188207800004
  • scopus:0942289739
ISSN
1434-6001
DOI
10.1140/epja/i2003-10115-2
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Mathematical Physics (Faculty of Technology) (011040002)
id
8b0bd0a5-d657-4197-9b98-945c207b9531 (old id 289749)
date added to LUP
2016-04-01 16:33:35
date last changed
2022-01-28 20:34:00
@article{8b0bd0a5-d657-4197-9b98-945c207b9531,
  abstract     = {{The mirror nuclei Mg-25 and Al-25 are expected to have very similar structures. The Gamow-Teller (GT) transitions from the J(pi) = 5/2(+) ground state of Mg-25 to the excited states in Al-25 were studied by high-resolution measurements of the Mg-25(He-3,t) charge-exchange reaction at 0degrees and at 140 MeV/nucleon. Assuming the usual DeltaJ(pi) = 1(+) selection rule for the spin-isospin-type GT transitions, the states with J(pi) = 3/2(+), 5/2(+), and 7/2 (+) should be excited. However, of the more than ten states with these J(pi) values below 6 MeV excitation energy, only the 5/2 (+) ground state and the 7/2 (+) , 1.613 MeV state in Al-25 were strongly populated, while all other states were strongly suppressed. The analysis of M1 transitions in Mg-25 also suggested a very similar feature for the analogous M1 transitions. Both Mg-25 and Al-25 are known to be largely deformed, and most low-lying states can be interpreted in terms of one-particle quantum numbers in the deformed potential and the associated rotational spectra. The observed suppression can be explained in terms of the K quantum number selection rules that are inherent to axially deformed nuclei.}},
  author       = {{Shimbara, Y and Fujita, Y and Adachi, T and Berg, GPA and Fujita, H and Fujita, K and Hamamoto-Kuroda, Ikuko and Hatanaka, K and Kamiya, J and Nakanishi, K and Sakemi, Y and Shimizu, Y and Uchida, M and Wakasa, T and Yosoi, M}},
  issn         = {{1434-6001}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{25--31}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal A. Hadrons and Nuclei}},
  title        = {{Suppression of Gamow-Teller and M1 transitions in deformed mirror nuclei Mg-25 and Al-25 - Direct observation of K selection rules}},
  url          = {{http://dx.doi.org/10.1140/epja/i2003-10115-2}},
  doi          = {{10.1140/epja/i2003-10115-2}},
  volume       = {{19}},
  year         = {{2004}},
}