B(E1) Strengths from Coulomb excitation of 11Be

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The B(E1;1/2{sup +}{yields} 1/2{sup -}) strength for {sup 11}Be has been extracted from intermediate energy Coulomb excitation measurements, over a range of beam energies using a new reaction model, the extended continuum discretized coupled channels (XCDCC) method. In addition, a measurement of the excitation cross section for {sup 11}Be+{sup 208}Pb at 38.6 MeV/nucleon is reported. The B(E1) strength of 0.105(12) e{sup 2}fm{sup 2} derived from this measurement is consistent with those made previously at 60 and 64 MeV/nucleon, in contrast to an anomalously low result obtained at 43 MeV/nucleon. By coupling a multi-configuration description of the projectile structure with realistic ... continued below

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7 p. (0.1 MB)

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Summers, N. C.; Pain, S. D.; Orr, N. A.; Catford, W. N.; Angelique, J. C.; Ashwood, N I et al. March 6, 2007.

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The B(E1;1/2{sup +}{yields} 1/2{sup -}) strength for {sup 11}Be has been extracted from intermediate energy Coulomb excitation measurements, over a range of beam energies using a new reaction model, the extended continuum discretized coupled channels (XCDCC) method. In addition, a measurement of the excitation cross section for {sup 11}Be+{sup 208}Pb at 38.6 MeV/nucleon is reported. The B(E1) strength of 0.105(12) e{sup 2}fm{sup 2} derived from this measurement is consistent with those made previously at 60 and 64 MeV/nucleon, in contrast to an anomalously low result obtained at 43 MeV/nucleon. By coupling a multi-configuration description of the projectile structure with realistic reaction theory, the XCDCC model provides for the first time a fully quantum mechanical description of Coulomb excitation. The XCDCC calculations reveal that the excitation process involves significant contributions from nuclear, continuum, and higher-order effects. An analysis of the present and two earlier intermediate energy measurements yields a combined B(E1) strength of 0.105(7) e{sup 2}fm{sup 2}. This value is in good agreement with the value deduced independently from the lifetime of the 1/2{sup -} state in {sup 11}Be, and has a comparable precision.

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7 p. (0.1 MB)

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PDF-file: 7 pages; size: 0.1 Mbytes

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  • Journal Name: Physics Letters B, vol. 650, no. 2, June 28, 2007, pp. 124; Journal Volume: 650; Journal Issue: 2

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  • Report No.: UCRL-JRNL-228990
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 914603
  • Archival Resource Key: ark:/67531/metadc889710

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  • March 6, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • April 17, 2017, 12:43 p.m.

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Summers, N. C.; Pain, S. D.; Orr, N. A.; Catford, W. N.; Angelique, J. C.; Ashwood, N I et al. B(E1) Strengths from Coulomb excitation of 11Be, article, March 6, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc889710/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.