Suppression of Gamow-Teller and M1 transitions in deformed mirror nuclei Mg-25 and Al-25 - Direct observation of K selection rules
(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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- author
- organization
- publishing date
- 2004
- 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}}, }