Elsevier

Nuclear Physics A

Volume 222, Issue 1, 1 April 1974, Pages 173-186
Nuclear Physics A

Anomalous results for the 9Be(α, t)10B and 13C(α, t)14N reactions at Eα = 27 meV

https://doi.org/10.1016/0375-9474(74)90592-2Get rights and content

Abstract

Angular distributions for the reactions 9Be(α, t)10B and 13C(α, t)14N have been measured at Eα = 27 MeV in the angular range 15°–110° c.m. for transitions to the first four states in 10B and the first five states in 14N. Excitation functions for 9Be(α, t)10B measured at the lab angles 25° and 45° in the energy range 26–27.5 MeV showed little structure indicating a small compound nucleus contribution. For both reactions the transition to the 0+T = 1 state is suppressed by at least a factor of five compared to the transition to the T = 0 states. DWBA and CCBA calculations gave a poor description of the data and did not predict the suppression of the T = 1 transitions in the (α, t) reactions. A reanalysis of more recent (d, n) and (τ, d) data in terms of the Cotanch-Robson isospin dependent DWBA model, which explains the spectroscopic factor ratio for T = 1T = 0 transitions in the two reactions, is also presented.

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    †††

    Supperted in part by grants NSF-GP-25974, NSF-GP-15855, and NSF-GU-2612.

    Present address: Physics Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260.

    ††

    Present address: Physics Department, University of Texas, Austin, Texas 78712.

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