TY - JOUR
T1 - Lifetime measurements of excited states in 17C
T2 - Possible interplay between collectivity and halo effects
AU - Suzuki, D.
AU - Iwasaki, H.
AU - Ong, H. J.
AU - Imai, N.
AU - Sakurai, H.
AU - Nakao, T.
AU - Aoi, N.
AU - Baba, H.
AU - Bishop, S.
AU - Ichikawa, Y.
AU - Ishihara, M.
AU - Kondo, Y.
AU - Kubo, T.
AU - Kurita, K.
AU - Motobayashi, T.
AU - Nakamura, T.
AU - Okumura, T.
AU - Onishi, T. K.
AU - Ota, S.
AU - Suzuki, M. K.
AU - Takeuchi, S.
AU - Togano, Y.
AU - Yanagisawa, Y.
N1 - Funding Information:
We thank the RIKEN Ring Cyclotron staff members for providing a stable Ne 22 beam throughout the experiment. Fruitful discussions with Dr. M. Yamagami, Prof. T. Suzuki and Prof. I. Hamamoto are greatly appreciated. D.S. is grateful to the Japan Society for the Promotion of Science (JSPS) for scholarships. This work was supported in part by a Grant-in-Aid for Scientific Research No. 15204017 from JSPS.
PY - 2008/8/21
Y1 - 2008/8/21
N2 - Lifetime measurements were performed on low-lying excited states of the neutron-rich isotope 17C using the recoil shadow method. The γ-decay mean lifetimes were determined to be 583 ± 21 (stat) ± 35 (syst) ps for the first excited state at 212 keV and 18.9 ± 0.6 (stat) ± 4.7 (syst) ps for the second excited state at 333 keV. Based on a comparison with the empirical upper limits for the electromagnetic transition strengths, these decays are concluded to be predominantly M1 transitions. The reduced M1 transition probabilities to the ground state were deduced to be (1.0 ± 0.1) × 10-2 μN2 and (8.2-1.8+3.2) × 10-2 μN2, respectively, for the first and second excited states. The strongly hindered M1 strength as well as the lowered excitation energy represents unique nature of the 212-keV state.
AB - Lifetime measurements were performed on low-lying excited states of the neutron-rich isotope 17C using the recoil shadow method. The γ-decay mean lifetimes were determined to be 583 ± 21 (stat) ± 35 (syst) ps for the first excited state at 212 keV and 18.9 ± 0.6 (stat) ± 4.7 (syst) ps for the second excited state at 333 keV. Based on a comparison with the empirical upper limits for the electromagnetic transition strengths, these decays are concluded to be predominantly M1 transitions. The reduced M1 transition probabilities to the ground state were deduced to be (1.0 ± 0.1) × 10-2 μN2 and (8.2-1.8+3.2) × 10-2 μN2, respectively, for the first and second excited states. The strongly hindered M1 strength as well as the lowered excitation energy represents unique nature of the 212-keV state.
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U2 - 10.1016/j.physletb.2008.07.055
DO - 10.1016/j.physletb.2008.07.055
M3 - Article
AN - SCOPUS:48449096894
SN - 0370-2693
VL - 666
SP - 222
EP - 227
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
ER -