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Title: B(E1) Strengths from Coulomb excitation of 11Be

Abstract

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.

Authors:
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Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
914603
Report Number(s):
UCRL-JRNL-228990
TRN: US0803348
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics Letters B, vol. 650, no. 2, June 28, 2007, pp. 124; Journal Volume: 650; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACCURACY; COULOMB EXCITATION; CROSS SECTIONS; EXCITATION; LIFETIME; PROJECTILES

Citation Formats

Summers, N C, Pain, S D, Orr, N A, Catford, W N, Angelique, J C, Ashwood, N I, Bouchat, V, Clarke, N M, Curtis, N, Freer, M, Fulton, B R, Hanappe, F, Labiche, M, Loucey, J L, Lemmon, R C, Mahboub, D, Ninane, A, Normand, G, Nunes, F M, Soic, N, Stuttge, L, Timis, C N, Thompson, I, Winfield, J S, and Ziman, V. B(E1) Strengths from Coulomb excitation of 11Be. United States: N. p., 2007. Web.
Summers, N C, Pain, S D, Orr, N A, Catford, W N, Angelique, J C, Ashwood, N I, Bouchat, V, Clarke, N M, Curtis, N, Freer, M, Fulton, B R, Hanappe, F, Labiche, M, Loucey, J L, Lemmon, R C, Mahboub, D, Ninane, A, Normand, G, Nunes, F M, Soic, N, Stuttge, L, Timis, C N, Thompson, I, Winfield, J S, & Ziman, V. B(E1) Strengths from Coulomb excitation of 11Be. United States.
Summers, N C, Pain, S D, Orr, N A, Catford, W N, Angelique, J C, Ashwood, N I, Bouchat, V, Clarke, N M, Curtis, N, Freer, M, Fulton, B R, Hanappe, F, Labiche, M, Loucey, J L, Lemmon, R C, Mahboub, D, Ninane, A, Normand, G, Nunes, F M, Soic, N, Stuttge, L, Timis, C N, Thompson, I, Winfield, J S, and Ziman, V. Tue . "B(E1) Strengths from Coulomb excitation of 11Be". United States. doi:. https://www.osti.gov/servlets/purl/914603.
@article{osti_914603,
title = {B(E1) Strengths from Coulomb excitation of 11Be},
author = {Summers, N C and Pain, S D and Orr, N A and Catford, W N and Angelique, J C and Ashwood, N I and Bouchat, V and Clarke, N M and Curtis, N and Freer, M and Fulton, B R and Hanappe, F and Labiche, M and Loucey, J L and Lemmon, R C and Mahboub, D and Ninane, A and Normand, G and Nunes, F M and Soic, N and Stuttge, L and Timis, C N and Thompson, I and Winfield, J S and Ziman, V},
abstractNote = {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.},
doi = {},
journal = {Physics Letters B, vol. 650, no. 2, June 28, 2007, pp. 124},
number = 2,
volume = 650,
place = {United States},
year = {Tue Mar 06 00:00:00 EST 2007},
month = {Tue Mar 06 00:00:00 EST 2007}
}