ANOMALOUSLY HINDERED E2 STRENGTHS IN 16,18C

被引:0
作者
Ong, Hooi Jin [1 ]
Imai, Nobuaki [2 ]
Suzuki, Daisuke [3 ]
Iwasaki, Hironori [3 ]
Onishi, Takeo [3 ]
Suzuki, Masaru [3 ]
Nakao, Taro [3 ]
Ichikawa, Yuichi [3 ]
Ota, Shinsuke [4 ]
Sakurai, Hiroyoshi [5 ]
Takeuchi, Satoshi [5 ]
Aoi, Nori [5 ]
Baba, Hidetada [5 ]
Bishop, Shawn [5 ]
Ishihara, Masayasu [5 ]
Kubo, Toshiyuki [5 ]
Motobayashi, Tohru [5 ]
Yanagisawa, Yoshiyuki [5 ]
Togano, Yasuhiro [6 ]
Kurita, Kazuo [6 ]
Kondo, Yosuke [7 ]
Nakamura, Takashi [7 ]
Okumura, Toshifumi [7 ]
机构
[1] Osaka Univ, Nucl Phys Res Ctr, Osaka 5670047, Japan
[2] Natl Lab High Energy Phys, KEK, Tsukuba, Ibaraki 3050801, Japan
[3] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan
[4] Univ Tokyo, Ctr Nucl Studies, Wako, Saitama 3510198, Japan
[5] RIKEN, RIKEN Nishina Ctr, 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
INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 2009年 / 24卷 / 11期
关键词
Lifetime measurement; B(E2); recoil shadow method; EVEN-EVEN NUCLEI;
D O I
10.1142/S0217751X09045753
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
Lifetime measurement of the first excited 2(+) state in C-18 was performed 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, which corresponds to a B(E2; 2(1)(+) -> 0(gs)(+)) value of 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 about 18 ps, about four times shorter than the value reported previously. By incorporating the gamma-ray angular distribution measured in this work into the previous measurement, this discrepancy has been explained. The observed transition strengths in C-16,C-18 are hindered compared to the empirical transition strengths, indicating that the anomalous hindered E2 strength observed in C-16 persists in C-18.
引用
收藏
页码:2168 / 2174
页数:7
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