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. Miller; T. 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

doi:10.1016/j.physletb.2007.08.053

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

Experimental Particle Physics

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75 Citations (Scopus)

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 e_i r_i² | 0₁⁺ 〉 | = 0.87 ± 0.03 e fm², respectively.

Original language	English
Pages (from-to)	87-91
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	654
Issue number	3-4
DOIs	https://doi.org/10.1016/j.physletb.2007.08.053
Publication status	Published - Oct 11 2007

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/j.physletb.2007.08.053

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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., ... 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

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

@article{2a34fedbebed4e31adb1579e54f071c3,

title = "Lifetime of the isomeric 02+ state in 12Be",

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.",

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

note = "Funding Information: We would like to thank the RIKEN Ring Cyclotron staff members for their operation during the experiment. We acknowledge Prof. T. Suzuki for the shell model predictions. The present work was partially supported by the Grant-in-Aid for Scientific Research (No. 15204018) by the Ministry of Education, Culture, Sports, Science and Technology.",

year = "2007",

month = oct,

day = "11",

doi = "10.1016/j.physletb.2007.08.053",

language = "English",

volume = "654",

pages = "87--91",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "3-4",

}

TY - JOUR

T1 - Lifetime of the isomeric 02+ state in 12Be

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.

N1 - Funding Information: We would like to thank the RIKEN Ring Cyclotron staff members for their operation during the experiment. We acknowledge Prof. T. Suzuki for the shell model predictions. The present work was partially supported by the Grant-in-Aid for Scientific Research (No. 15204018) by the Ministry of Education, Culture, Sports, Science and Technology.

PY - 2007/10/11

Y1 - 2007/10/11

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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U2 - 10.1016/j.physletb.2007.08.053

DO - 10.1016/j.physletb.2007.08.053

M3 - Article

AN - SCOPUS:34548825424

SN - 0370-2693

VL - 654

SP - 87

EP - 91

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 3-4

ER -

Lifetime of the isomeric 0₂⁺ state in ¹²Be

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