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JOURNALS // Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki // Archive

Pis'ma v Zh. Èksper. Teoret. Fiz., 2015 Volume 102, Issue 7, Pages 467–470 (Mi jetpl4743)

This article is cited in 17 papers

FIELDS, PARTICLES, AND NUCLEI

Neutron halo in the exotic first excited state of $^9$Be

A. S. Demyanovaa, A. A. Ogloblina, A. N. Danilova, S. V. Dmitrieva, V. I. Starostina, S. A. Goncharovb, T. L. Belyaevac, W. H. Trzaskad, V. A. Maslove, Yu. G. Soboleve, N. Burtebaevf, E. Mukhamedzhanovg, L. I. Slyusarenkoh, Yu. N. Pavlenkoh

a National Research Centre Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 128182, Russia
b Moscow State University, Moscow, 119991, Russia
c Universidad Autónoma del Estado de México
d Jyväskylän Yliopisto Finland, FI-40014 Jyväskylä, Finland
e Joint Institute for Nuclear Research, ul. Joliot-Curie 6, Dubna, Moscow region, 141980, Russia
f Institute of Nuclear Physics, National Nuclear Center of the Republic of Kazakhstan, ul. Ibragimova 1, Almaty, 050032, Republic of Kazakhstan
g Al-Farabi Kazakh National University, pr. Al-Farabi 71, Almaty, 050040, Republic of Kazakhstan
h Institute for Nuclear Research, National Academy of Sciences of Ukraine, pr. Nauki 47, 03680, Kyiv, Ukraine

Abstract: Differential cross sections for elastic and inelastic $^9\mathrm{Be} + \alpha$ scattering (the inelastic scattering leading to the $1.68$- and $2.43$-MeV states) were measured at the energies of $40$ and $90$ MeV. The radii of the excited states in question were determined on the basis of a modified diffraction model. The root-mean-square radius of the level at $1.68$ MeV proved to be approximately $1$ fm larger than the radii of both neighboring states. The reason is that, for this level, there is a neutron halo whose properties are similar to the properties of the known halo in the $^{11}\mathrm{Be}$ nucleus. This result is the first observation of a halo in an unbound state lying above the neutronemission threshold.

Received: 12.08.2015

DOI: 10.7868/S0370274X15190029


 English version:
Journal of Experimental and Theoretical Physics Letters, 2015, 102:7, 413–416

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