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arXiv · 2307.05079

Decay Pattern of Pygmy States Observed in Neutron-Rich 26 Ne

J. Gibelin·D. Beaumel·T. Motobayashi·Y. Blumenfeld·N. Aoi·H. Baba·Z. Elekes·S. Fortier·N. Frascaria·N. Fukuda·T. Gomi·K. Ishikawa·Y. Kondo·T. Kubo·V. Lima·T. Nakamura·A. Saito·Y. Satou·J. -A. Scarpaci·E. Takeshita·S. Takeuchi·T. Teranishi·Y. Togano·A. M. Vinodkumar·Y. Yanagisawa·K. Yoshida
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Abstract

Coulomb excitation of the exotic neutron-rich nucleus Ne26 on a Pb208 target was measured at 58 MeV/u in order to search for low-lying E1 strength above the neutron emission threshold. This radioactive beam experiment was carried out at the RIKEN Accelerator Research Facility. Using the invariant mass method in the Ne25+n channel, we observe a sizable amount of E1 strength between 6 and 10 MeV excitation energy. By performing a multipole decomposition of the differential cross section, a reduced dipole transition probability of B(E1)=0.49+-0.16e2fm2 is deduced, corresponding to 4.9+-1.6% of the Thomas-Reiche-Kuhn sum rule. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is measured. The extracted decay pattern is not consistent with several mean-field theory descriptions of the pygmy states.

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J. Gibelin, D. Beaumel, T. Motobayashi, Y. Blumenfeld, N. Aoi, H. Baba, Z. Elekes, S. Fortier, N. Frascaria, N. Fukuda, T. Gomi, K. Ishikawa, Y. Kondo, T. Kubo, V. Lima, T. Nakamura, A. Saito, Y. Satou, J. -A. Scarpaci, E. Takeshita, S. Takeuchi, T. Teranishi, Y. Togano, A. M. Vinodkumar, Y. Yanagisawa, K. Yoshida. 2023-07-11. Decay Pattern of Pygmy States Observed in Neutron-Rich 26 Ne. https://doi.org/10.1103/physrevlett.101.212503

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