Evidence for a 3.8 MeV state in Be 9

Robin Smith, C. Wheldon, M. Freer, N. Curtis, Tzanka Kokalova Wheldon, S. Almaraz-Calderon, A. Aprahamian, N. I. Ashwood, M. Barr, B. Bucher, P. Copp, M. Couder, X. Fang, G. Goldring, F. Jung, S. R. Lesher, W. Lu, J. D. Malcolm, A. Roberts, W. P. TanV. A. Ziman

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Abstract

The breakup reaction 9Be(4He ,3α)n was measured using an array of four double-sided silicon strip detectors at beam energies of 22 and 26 MeV. Excited states in 9Be up to 8 MeV were populated and reconstructed through measurements of the charged reaction products. Evidence is given for a state in 9Be at 3.82+0.08 -0.09 MeV with = 1240+270 -90 keV. This is consistent with two recent measurements of a state with similar properties in the mirror nucleus 9B. An analysis of the reduced widths (8Beg.s. channel) of this state along with the proposed mirror state has led to a firm limit of J 7/2 and a tentative assignment of J π = 1/2− or 3/2−.
Original languageEnglish
Article number014320
Pages (from-to)1-9
Number of pages9
JournalPhysical Review C
Volume94
Issue number1
DOIs
Publication statusPublished - 25 Jul 2016

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