Observation/confirmation of hindered E2 strength in 18C/16C

被引：5

作者：

Ong, H. J. ^{[1
]}

Imai, N. ^{[2
]}

Suzuki, D. ^{[3
]}

Iwasaki, H. ^{[3
]}

Sakurai, H. ^{[4
]}

Onishi, T. K. ^{[3
]}

Suzuki, M. K. ^{[3
]}

Ota, S. ^{[5
]}

Takeuchi, S. ^{[4
]}

Nakao, T. ^{[3
]}

Togano, Y. ^{[6
]}

Kondo, Y. ^{[4
]}

Aoi, N. ^{[4
]}

Baba, H. ^{[4
]}

Bishop, S. ^{[4
]}

Ichikawa, Y. ^{[3
]}

Ishihara, M. ^{[4
]}

Kubo, T. ^{[4
]}

Kurita, K. ^{[6
]}

Motobayashi, T. ^{[4
]}

Nakamura, T. ^{[7
]}

Okumura, T. ^{[7
]}

Yanagisawa, Y. ^{[4
]}

机构：

[1] Osaka Univ, RCNP, Osaka 5670047, Japan

[2] KEK, Tsukuba, Ibaraki 3050801, Japan

[3] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[4] RIKEN, Nishina Ctr, Wako, Saitama 3510198, Japan

[5] Univ Tokyo, CNS, Wako, Saitama 3510198, Japan

[6] Rikkyo Univ, Dept Phys, Tokyo 1718501, Japan

[7] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan

来源：

EUROPEAN PHYSICAL JOURNAL A | 2009年 / 42卷 / 03期

关键词：

EVEN-EVEN NUCLEI;

D O I：

10.1140/epja/i2009-10804-8

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We have measured the lifetime of the first excited 2(+) state in 18 C using an upgraded recoil shadow method to determine the electric quadrupole transition. The measured mean lifetime is 18.9 +/- 0.9 (stat) +/- 4.4 (syst) ps, corresponding to B(E2; 2(1)(+) -> 0(gs)(+)) = 4.3 +/- 0.2 +/- 1.0 e(2) fm(4), or about 1.5 Weisskopf units. The mean lifetime of the first 2(+) state in C-16 was remeasured to be 18.3 +/- 1.4 +/- 4.8 ps, about four times shorter than the value reported previously. The discrepancy is explained by incorporating the gamma-ray angular distribution obtained in this work into the previous measurement. The observed transition strengths in C-16,C-18 are hindered compared to the empirical values, indicating that the anomalous E2 strength observed in C-16 persists in C-18.

引用

页码：393 / 396

页数：4

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