Gamow-Teller Strength in the A=14 Multiplet: A Challenge to the Shell Model

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A new experimental approach to the famous problem of the anomalously slow Gamow-Teller (GT) transitions in the {beta} decay of the A = 14 multiplet is presented. The GT strength distributions to excited states in {sup 14}C and {sup 14}O was studied in high-resolution (d,{sup 2}He) and ({sup 3}He,t) charge-exchange reactions on {sup 14}N. No-core shell-model (NCSM) calculations capable of reproducing the suppression of the {beta} decays predict a selective excitation of J{sup {pi}} = 2{sup +} states. The experimental confirmation represents a validation of the assumptions about the underlying structure of the {sup 14}N ground state wave function. However, ... continued below

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Negret, A.; Adachi, T.; Barrett, B. R.; Baumer, C.; den Berg, A. V.; Berg, G. et al. August 7, 2006.

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A new experimental approach to the famous problem of the anomalously slow Gamow-Teller (GT) transitions in the {beta} decay of the A = 14 multiplet is presented. The GT strength distributions to excited states in {sup 14}C and {sup 14}O was studied in high-resolution (d,{sup 2}He) and ({sup 3}He,t) charge-exchange reactions on {sup 14}N. No-core shell-model (NCSM) calculations capable of reproducing the suppression of the {beta} decays predict a selective excitation of J{sup {pi}} = 2{sup +} states. The experimental confirmation represents a validation of the assumptions about the underlying structure of the {sup 14}N ground state wave function. However, the fragmentation of the GT strength over three 2{sup +} final states remains a fundamental issue not explained by the present NCSM using a 6 {h_bar}{omega} model space, suggesting possibly the need to include cluster structure in these light nuclei in a consistent way.

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  • Journal Name: Physical Review Letters, vol. 97, n/a, August 7, 2006, pp. 062502; Journal Volume: 97

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  • Report No.: UCRL-JRNL-223644
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 895414
  • Archival Resource Key: ark:/67531/metadc880985

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  • August 7, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • July 13, 2017, 1:45 p.m.

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Negret, A.; Adachi, T.; Barrett, B. R.; Baumer, C.; den Berg, A. V.; Berg, G. et al. Gamow-Teller Strength in the A=14 Multiplet: A Challenge to the Shell Model, article, August 7, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc880985/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.