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Elsevier, Nuclear Physics A, 1-4(788), p. 153-158

DOI: 10.1016/j.nuclphysa.2007.01.076

American Institute of Physics, AIP Conference Proceedings

DOI: 10.1063/1.2140651

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Search for low lying dipole strength in the neutron rich nucleus $^{26}$Ne

Journal article published in 2005 by D. Beaumel, T. Motobayashi, T. Gomi, K. Ishikawa, Y. Kondo, T. Kubo, N. Aoi, V. Lima, H. Baba ORCID, T. Nakamura, Julien Gibelin ORCID, Y. Blumenfeld, A. Saito, Z. Elekes ORCID, Y. Satou and other authors.
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This paper is available in a repository.

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Abstract

Coulomb excitation of the exotic neutron-rich nucleus $^{26}$Ne on a $^{nat}$Pb target was measured at 58 A.MeV in order to search for low-lying E1 strength above the neutron emission threshold. Data were also taken on an $^{nat}$Al target to estimate the nuclear contribution. The radioactive beam was produced by fragmentation of a 95 A.MeV $^{40}$Ar beam delivered by the RIKEN Research Facility. The set-up included a NaI gamma-ray array, a charged fragment hodoscope and a neutron wall. Using the invariant mass method in the $^{25}$Ne+n channel, we observe a sizable amount of E1 strength between 6 and 10 MeV. The reconstructed $^{26}$Ne angular distribution confirms its E1 nature. A reduced dipole transition probability of B(E1)=0.49$±$0.16 $e^2fm^2$ is deduced. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is obtained. The results are discussed in terms of a pygmy resonance centered around 9 MeV.