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First excited 1/2(+) state in B-9

Baldwin, TD, Catford, WN, Mahboub, D, Timis, CN, Ashwood, NI, Clarke, NM, Curtis, N, Ziman, V, Brown, TAD, Fox, SP, Fulton, BR, Groombridge, D, Watson, DL, Pucknell, VFE and Weisser, DC (2012) First excited 1/2(+) state in B-9 PHYSICAL REVIEW C, 86 (3). ? - ?. ISSN 0556-2813

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Evidence has been found for a broad unbound state near 1 MeV excitation in 9B that is a candidate for the long-disputed 12 mirror of the unbound 1.68 MeV state in 9Be. Reactions of 6Li 6Li were studied with a 60 MeV beam incident on a 240 μg/cm2 6LiF target. The breakup fragments from the decay of the reaction products were detected in five Si-Si-CsI telescope detectors and the breakup particles were reconstructed using the technique of resonant particle spectroscopy. It is shown that contrary to a previous study, the 12 is not populated in the reaction 6Li(6Li,t)9B, but that it is populated via the 6Li(6Li,d)10B reaction. The sequential decays of 10B populated the channels 6Li(g.s.)+α, 6Li(2.186 MeV)+α, 8Be+d, and pnαα, with the latter including (9B+n or 9Be+p) decay from 10B. Decays through 9B are identified and show the presence of the 12 state as a broad asymmetric peak around 0.8-1.0MeV with Γ 1.5 MeV. © 2012 American Physical Society.

Item Type: Article
Additional Information: Copyright 2012 The American Physical Society.
Uncontrolled Keywords: Science & Technology, Physical Sciences, Physics, Nuclear, Physics, MICROSCOPIC 3-CLUSTER, ENERGY-LEVELS, LIGHT-NUCLEI, LEVEL, BE-9
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Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Symplectic Elements
Date Deposited: 13 Nov 2012 10:33
Last Modified: 23 Sep 2013 19:47

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