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

TY - JOUR

T1 - First excited 1/2(+) state in B-9

AU - Baldwin, T. D.

AU - Catford, W. N.

AU - Mahboub, D.

AU - Timis, C. N.

AU - Ashwood, N. I.

AU - Clarke, N. M.

AU - Curtis, N.

AU - Ziman, V.

AU - Brown, T. A. D.

AU - Fox, S. P.

AU - Fulton, B. R.

AU - Groombridge, D.

AU - Watson, D. L.

AU - Pucknell, V. F. E.

AU - Weisser, D. C.

PY - 2012/9/24

Y1 - 2012/9/24

N2 - Evidence has been found for a broad unbound state near 1 MeV excitation in B-9 that is a candidate for the long-disputed 1/2(+) mirror of the unbound 1.68 MeV state in Be-9. Reactions of Li-6+Li-6 were studied with a 60 MeV beam incident on a 240 mu g/cm(2) (LiF)-Li-6 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 1/2(+) is not populated in the reaction Li-6(Li-6,t)B-9 but that it is populated via the Li-6(Li-6,d)B-10 reaction. The sequential decays of B-10 populated the channels Li-6(g.s.)+alpha, Li-6(2.186 MeV)+alpha, Be-8+d, and pn alpha alpha with the latter including (B-9+n or Be-9+p) decay from B-10. Decays through B-9 are identified and show the presence of the 1/2(+) state as a broad asymmetric peak around 0.8-1.0 MeV with Gamma approximate to 1.5 MeV.

AB - Evidence has been found for a broad unbound state near 1 MeV excitation in B-9 that is a candidate for the long-disputed 1/2(+) mirror of the unbound 1.68 MeV state in Be-9. Reactions of Li-6+Li-6 were studied with a 60 MeV beam incident on a 240 mu g/cm(2) (LiF)-Li-6 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 1/2(+) is not populated in the reaction Li-6(Li-6,t)B-9 but that it is populated via the Li-6(Li-6,d)B-10 reaction. The sequential decays of B-10 populated the channels Li-6(g.s.)+alpha, Li-6(2.186 MeV)+alpha, Be-8+d, and pn alpha alpha with the latter including (B-9+n or Be-9+p) decay from B-10. Decays through B-9 are identified and show the presence of the 1/2(+) state as a broad asymmetric peak around 0.8-1.0 MeV with Gamma approximate to 1.5 MeV.

UR - http://www.scopus.com/inward/record.url?scp=84866690592&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.86.034330

DO - 10.1103/PhysRevC.86.034330

M3 - Article

SN - 0556-2813

VL - 86

SP - -

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 034330

ER -