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Reorientation-effect measurement of the 〈21+∥E2∥1+〉 matrix element in 10Be

J. N. Orce ; T. E. Drake ; M. K. Djongolov ; P. Navratil ; S. Triambak ; G. C. Ball ; H. Al Falou ; R. Churchman ; D. S. Cross ; P. Finlay ; Christian Forssén (Institutionen för fundamental fysik) ; A. B. Garnsworthy ; P. E. Garrett ; G. Hackman ; A. B. Hayes ; R. Kshetri ; J. Lassen ; K. G. Leach ; R. Li ; J. Meissner ; C. J. Pearson ; E. T. Rand ; F. Sarazin ; S. K. L. Sjue ; M. A. Stoyer ; C. S. Sumithrarachchi ; C. E. Svensson ; E. R. Tardiff ; A. Teigelhoefer ; S. J. Williams ; J. Wong ; C. Y. Wu
Physical Review C (0556-2813). Vol. 86 (2012), 4,
[Artikel, refereegranskad vetenskaplig]

The highly-efficient and segmented TIGRESS gamma-ray spectrometer at TRIUMF has been used to perform a reorientation-effect Coulomb-excitation study of the 2(1)(+) state at 3.368 MeV in Be-10. This is the first Coulomb-excitation measurement that enables one to obtain information on diagonal matrix elements for such a high-lying first excited state from gamma-ray data. With the availability of accurate lifetime data, a value of -0.110 +/- 0.087 eb is determined for the < 2(1)(+)parallel to(E) over cap2 parallel to 2(1)(+)> diagonal matrix element, which assuming the rotor model, leads to a negative spectroscopic quadrupole moment of Q(S)(2(1)(+)) = -0.083 +/- 0.066 eb. This result is in agreement with both no-core shell-model calculations performed in this work with the CD-Bonn 2000 two-nucleon potential and large shell-model spaces, and Green's function Monte Carlo predictions with two-plus three-nucleon potentials.

Nyckelord: coulomb-excitation, clover detector, nuclei, tigress, moments, triumf, shell, li-7



Denna post skapades 2012-11-16. Senast ändrad 2012-11-16.
CPL Pubid: 166274

 

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