Evidence for a 3.8 MeV state in 9Be
- Smith, Robin
- Wheldon, Carl
- Freer, Martin
- Curtis, Neil
- Kokalova, Tzany
- Almaraz-Calderon, S.
- Aprahamian, A.
- Ashwood, N. I.
- Barr, M.
- Butcher, B.
- Copp, P.
- Couder, M.
- Fang, X.
- Goldring, G.
- Jung, F.
- Lesher, S. R.
- Lu, W.
- Malcolm, J. D.
- Roberts, A.
- Tan, W. P.
- Ziman, V. A.
DOIAbstract
The breakup reaction 9Be(4He,3a)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 3.82-0.09+0.08 MeV with width=1240-90+270 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 (Beg.s.8 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^pi=1/2- or 3/2-
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