Abstract
One of the most striking aspects of the recent detailed exploration of the Gamow-Teller resonances is the systematic observation that the summed axial vector strength is appreciably lower than that expected from the Gamow-Teller sum rule. The latter is obtained under the assumption of additivity of the free nucleon coupling \(g{}_A\overrightarrow \sigma.\overrightarrow \tau \) (with gA = 1.25) to the axial current; indeed simple Pauli matrix algebra gives then:
In principle, both the positively and negatively charged branches have to be measured; in a nucleus with positive neutron excess however, equation (1) gives already a lower limit for the σ τ+ strength which is the quantity accessible through (p,n) reactions and Pauli blocking rapidly suppresses the T- branch as (N-Z) increases. Thus, if one assumes that no part of the strength has escaped detection, a reduction such as that observed in a wide range of nuclei is strongly suggestive of the intervention of new degrees of freedom.
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© 1984 Plenum Press, New York
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Delorme, J., Ericson, M., Figureau, A., Giraud, N. (1984). Lorentz-Lorenz Quenching for the Gamow-Teller Sum Rules. In: Petrovich, F., Brown, G.E., Garvey, G.T., Goodman, C.D., Lindgren, R.A., Love, W.G. (eds) Spin Excitations in Nuclei. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-4706-4_13
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DOI: https://doi.org/10.1007/978-1-4684-4706-4_13
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