Lifetime of the isomeric 02+ state in 12Be

S. Shimoura, S. Ota, K. Demichi, N. Aoi, H. Baba, Z. Elekes, T. Fukuchi, T. Gomi, K. Hasegawa, E. Ideguchi, M. Ishihara, N. Iwasa, H. Iwasaki, S. Kanno, S. Kubono, K. Kurita, M. Kurokawa, Y. U. Matsuyama, S. Michimasa, K. MillerT. Minemura, T. Motobayashi, T. Murakami, M. Notani, A. Odahara, A. Saito, H. Sakurai, E. Takeshita, S. Takeuchi, M. Tamaki, T. Teranishi, K. Yamada, Y. Yanagisawa, I. Hamamoto

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Abstract

Mean lifetime τ of the isomeric 02+ state in 12Be has been determined by measuring decay spectra of delayed γ-rays from stopped 12Be nuclei produced by the projectile fragmentation of 18O at 100 A MeV. A consistent value of τ = 331 ± 12   ns was obtained from the time spectra of the E2 γ decay to the 21+ 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 (E 2 ; 02+ → 21+) = 7.0 ± 0.6   e2 fm4 and | 〈 02+ | ∑i ei ri2 | 01+ 〉 | = 0.87 ± 0.03   e fm2, respectively.

Original languageEnglish
Pages (from-to)87-91
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume654
Issue number3-4
DOIs
Publication statusPublished - Oct 11 2007

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life (durability)
decay
positron annihilation
projectiles
rays
fragmentation
nuclei
ground state

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Shimoura, S., Ota, S., Demichi, K., Aoi, N., Baba, H., Elekes, Z., ... Hamamoto, I. (2007). Lifetime of the isomeric 02+ state in 12Be. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 654(3-4), 87-91. https://doi.org/10.1016/j.physletb.2007.08.053

Lifetime of the isomeric 02+ state in 12Be. / Shimoura, S.; Ota, S.; Demichi, K.; Aoi, N.; Baba, H.; Elekes, Z.; Fukuchi, T.; Gomi, T.; Hasegawa, K.; Ideguchi, E.; Ishihara, M.; Iwasa, N.; Iwasaki, H.; Kanno, S.; Kubono, S.; Kurita, K.; Kurokawa, M.; Matsuyama, Y. U.; Michimasa, S.; Miller, K.; Minemura, T.; Motobayashi, T.; Murakami, T.; Notani, M.; Odahara, A.; Saito, A.; Sakurai, H.; Takeshita, E.; Takeuchi, S.; Tamaki, M.; Teranishi, T.; Yamada, K.; Yanagisawa, Y.; Hamamoto, I.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 654, No. 3-4, 11.10.2007, p. 87-91.

Research output: Contribution to journalArticle

Shimoura, S, Ota, S, Demichi, K, Aoi, N, Baba, H, Elekes, Z, Fukuchi, T, Gomi, T, Hasegawa, K, Ideguchi, E, Ishihara, M, Iwasa, N, Iwasaki, H, Kanno, S, Kubono, S, Kurita, K, Kurokawa, M, Matsuyama, YU, Michimasa, S, Miller, K, Minemura, T, Motobayashi, T, Murakami, T, Notani, M, Odahara, A, Saito, A, Sakurai, H, Takeshita, E, Takeuchi, S, Tamaki, M, Teranishi, T, Yamada, K, Yanagisawa, Y & Hamamoto, I 2007, 'Lifetime of the isomeric 02+ state in 12Be', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 654, no. 3-4, pp. 87-91. https://doi.org/10.1016/j.physletb.2007.08.053
Shimoura, S. ; Ota, S. ; Demichi, K. ; Aoi, N. ; Baba, H. ; Elekes, Z. ; Fukuchi, T. ; Gomi, T. ; Hasegawa, K. ; Ideguchi, E. ; Ishihara, M. ; Iwasa, N. ; Iwasaki, H. ; Kanno, S. ; Kubono, S. ; Kurita, K. ; Kurokawa, M. ; Matsuyama, Y. U. ; Michimasa, S. ; Miller, K. ; Minemura, T. ; Motobayashi, T. ; Murakami, T. ; Notani, M. ; Odahara, A. ; Saito, A. ; Sakurai, H. ; Takeshita, E. ; Takeuchi, S. ; Tamaki, M. ; Teranishi, T. ; Yamada, K. ; Yanagisawa, Y. ; Hamamoto, I. / Lifetime of the isomeric 02+ state in 12Be. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2007 ; Vol. 654, No. 3-4. pp. 87-91.
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AU - Shimoura, S.

AU - Ota, S.

AU - Demichi, K.

AU - Aoi, N.

AU - Baba, H.

AU - Elekes, Z.

AU - Fukuchi, T.

AU - Gomi, T.

AU - Hasegawa, K.

AU - Ideguchi, E.

AU - Ishihara, M.

AU - Iwasa, N.

AU - Iwasaki, H.

AU - Kanno, S.

AU - Kubono, S.

AU - Kurita, K.

AU - Kurokawa, M.

AU - Matsuyama, Y. U.

AU - Michimasa, S.

AU - Miller, K.

AU - Minemura, T.

AU - Motobayashi, T.

AU - Murakami, T.

AU - Notani, M.

AU - Odahara, A.

AU - Saito, A.

AU - Sakurai, H.

AU - Takeshita, E.

AU - Takeuchi, S.

AU - Tamaki, M.

AU - Teranishi, T.

AU - Yamada, K.

AU - Yanagisawa, Y.

AU - Hamamoto, I.

PY - 2007/10/11

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N2 - Mean lifetime τ of the isomeric 02+ state in 12Be has been determined by measuring decay spectra of delayed γ-rays from stopped 12Be nuclei produced by the projectile fragmentation of 18O at 100 A MeV. A consistent value of τ = 331 ± 12   ns was obtained from the time spectra of the E2 γ decay to the 21+ 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 (E 2 ; 02+ → 21+) = 7.0 ± 0.6   e2 fm4 and | 〈 02+ | ∑i ei ri2 | 01+ 〉 | = 0.87 ± 0.03   e fm2, respectively.

AB - Mean lifetime τ of the isomeric 02+ state in 12Be has been determined by measuring decay spectra of delayed γ-rays from stopped 12Be nuclei produced by the projectile fragmentation of 18O at 100 A MeV. A consistent value of τ = 331 ± 12   ns was obtained from the time spectra of the E2 γ decay to the 21+ 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 (E 2 ; 02+ → 21+) = 7.0 ± 0.6   e2 fm4 and | 〈 02+ | ∑i ei ri2 | 01+ 〉 | = 0.87 ± 0.03   e fm2, respectively.

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