Spectroscopy of B13 via the C13(t,He3) reaction at 115A MeV

C. J. Guess, R. G.T. Zegers, B. A. Brown, Sam M. Austin, D. Bazin, C. Caesar, J. M. Deaven, G. F. Grinyer, C. Herlitzius, G. W. Hitt, S. Noji, R. Meharchand, G. Perdikakis, H. Sakai, Y. Shimbara, C. Tur

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Abstract

Gamow-Teller and dipole transitions to final states in B13 were studied via the C13(t,He3) reaction at Et=115AMeV. In addition to the strong Gamow-Teller transition to the B13 ground state, a weaker Gamow-Teller transition to a state at 3.6MeV was found. This state was assigned a spin-parity of 3/2- by comparison with shell-model calculations using the WBP and WBT interactions which were modified to allow for mixing between nω and (n+2)ω configurations. This assignment agrees with a recent result from a lifetime measurement of excited states in B13. The shell-model calculations also explained the relatively large spectroscopic strength measured for a low-lying 1/2+ state at 4.83MeV in B13. The cross sections for dipole transitions up to Ex(B13)=20MeV excited via the C13(t,He3) reaction were also compared with the shell-model calculations. The theoretical cross sections exceeded the data by a factor of about 1.8, which might indicate that the dipole excitations are "quenched". Uncertainties in the reaction calculations complicate that interpretation.

Original languageEnglish
Article number024305
JournalPhysical Review C - Nuclear Physics
Volume80
Issue number2
DOIs
StatePublished - Aug 13 2009

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