Lifetime measurements of excited states in 17C: Possible interplay between collectivity and halo effects

D. Suzuki, H. Iwasaki, H. J. Ong, N. Imai, H. Sakurai, T. Nakao, N. Aoi, H. Baba, S. Bishop, Y. Ichikawa, M. Ishihara, Y. Kondo, T. Kubo, K. Kurita, T. Motobayashi, T. Nakamura, T. Okumura, T. K. Onishi, S. Ota, M. K. SuzukiS. Takeuchi, Y. Togano, Y. Yanagisawa

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22 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)222-227
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume666
Issue number3
DOIs
Publication statusPublished - Aug 21 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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