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Lifetime of the isomeric O-2(+) state in Be-12

Shimoura, S.; Ota, S.; Demichi, K.; Aoi, N.; Baba, H.; Elekes, Z.; Fukuchi, T.; Gomi, T.; Hasegawa, K. and Ideguchi, E., et al. (2007) In Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics 654(3-4). p.87-91
Abstract
Mean lifetime tau of the isomeric O-2(+) state in Be-12 has been determined by measuring decay spectra of delayed y-rays from stopped Be-12 2 nuclei produced by the projectile fragmentation of O-18 at 100 A MeV. A consistent value of tau = 331 +/- 12 ns was obtained from the time spectra of the E2 gamma decay to the 2(1)(+) state and the positron annihilation following the E0 decay to the ground state. Based on the observed branching ratio between the E2 and E0 decays, transition strengths of the two decay modes were deduced to be B(E2; O-2(+) -> 2(1)(+)) = 7.0 +/- 0.6 e(2) fm(4) and 2 1 1 (O-2(+) Sigma(i) e(i) r(i)(2) O-1(+)), = 0.87 +/- 0.03 e fM(2), respectively. (C) 2007 Elsevier B.V. All rights reserved.
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publication status
published
subject
keywords
radioactive beam experiment, lifetime, reduced matrix elements
in
Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
654
issue
3-4
pages
87 - 91
publisher
Elsevier
external identifiers
  • wos:000250282600006
  • scopus:34548825424
ISSN
0370-2693
DOI
10.1016/j.physletb.2007.08.053
language
English
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yes
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2c904d32-a152-470e-b885-dacad5e73bbe (old id 654237)
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2008-01-02 15:28:25
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2017-10-08 04:16:57
@article{2c904d32-a152-470e-b885-dacad5e73bbe,
  abstract     = {Mean lifetime tau of the isomeric O-2(+) state in Be-12 has been determined by measuring decay spectra of delayed y-rays from stopped Be-12 2 nuclei produced by the projectile fragmentation of O-18 at 100 A MeV. A consistent value of tau = 331 +/- 12 ns was obtained from the time spectra of the E2 gamma decay to the 2(1)(+) state and the positron annihilation following the E0 decay to the ground state. Based on the observed branching ratio between the E2 and E0 decays, transition strengths of the two decay modes were deduced to be B(E2; O-2(+) -> 2(1)(+)) = 7.0 +/- 0.6 e(2) fm(4) and 2 1 1 (O-2(+) Sigma(i) e(i) r(i)(2) O-1(+)), = 0.87 +/- 0.03 e fM(2), respectively. (C) 2007 Elsevier B.V. All rights reserved.},
  author       = {Shimoura, S. and Ota, S. and Demichi, K. and Aoi, N. and Baba, H. and Elekes, Z. and Fukuchi, T. and Gomi, T. and Hasegawa, K. and Ideguchi, E. and Ishihara, M. and Iwasa, N. and Iwasaki, H. and Kanno, S. and Kubono, S. and Kurita, K. and Kurokawa, M. and Matsuyama, Y. U. and Michimasa, S. and Miller, K. and Minemura, T. and Motobayashi, T. and Murakami, T. and Notani, M. and Odahara, A. and Saito, A. and Sakurai, H. and Takeshita, E. and Takeuchi, S. and Tamaki, M. and Teranishi, T. and Yamada, K. and Yanagisawa, Y. and Hamamoto-Kuroda, Ikuko},
  issn         = {0370-2693},
  keyword      = {radioactive beam experiment,lifetime,reduced matrix elements},
  language     = {eng},
  number       = {3-4},
  pages        = {87--91},
  publisher    = {Elsevier},
  series       = {Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {Lifetime of the isomeric O-2(+) state in Be-12},
  url          = {http://dx.doi.org/10.1016/j.physletb.2007.08.053},
  volume       = {654},
  year         = {2007},
}