Gamow-Teller strength of [Formula Presented]Nb in the continuum studied via multipole decomposition analysis of the [Formula Presented]Zr[Formula Presented] reaction at 295 MeV

T. Wakasa, H. Sakai, H. Okamura, H. Otsu, S. Fujita, S. Ishida, N. Sakamoto, T. Uesaka, Y. Satou, M. B. Greenfield, K. Hatanaka

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Abstract

The double differential cross sections at [Formula Presented] between [Formula Presented] and [Formula Presented] and the polarization transfer [Formula Presented] at [Formula Presented] for the [Formula Presented] reaction are measured at a bombarding energy of 295 MeV. A multipole decomposition technique is applied to the cross sections to extract [Formula Presented], [Formula Presented], [Formula Presented], and [Formula Presented] contributions. The Gamow-Teller (GT) strength [Formula Presented] in the continuum deduced from the [Formula Presented] cross section is compared both with the perturbative calculation by Bertsch and Hamamoto and with the second-order random phase approximation calculation by Drożdż et al. The sum of [Formula Presented] values up to 50 MeV excitation becomes [Formula Presented]=28.0±1.6 after subtracting the contribution of the isovector spin-monopole strength. This [Formula Presented] value of 28.0[Formula Presented]1.6 corresponds to about (93 [Formula Presented] 5)% of the minimum value of the sum rule [Formula Presented]=30. The usefulness of the polarization transfer observable in the distorted wave impulse approximation is presented.

Original languageEnglish
Pages (from-to)2909-2922
Number of pages14
JournalPhysical Review C - Nuclear Physics
Volume55
Issue number6
DOIs
Publication statusPublished - 1997

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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