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Excited-state transition-rate measurements in C-18

P. Voss ; T. Baugher ; D. Bazin ; R. M. Clark ; H. L. Crawford ; A. Dewald ; P. Fallon ; A. Gade ; G. F. Grinyer ; H. Iwasaki ; A. O. Macchiavelli ; S. McDaniel ; D. Miller ; M. Petri ; A. Ratkiewicz ; W. Rother ; K. Starosta ; K. A. Walsh ; D. Weisshaar ; Christian Forssén (Institutionen för fundamental fysik, Subatomär fysik) ; R. Roth ; P. Navratil
Physical Review C (0556-2813). Vol. 86 (2012), 1,
[Artikel, refereegranskad vetenskaplig]

Excited states in C-18 were populated by the one-proton knockout reaction of an intermediate energy radioactive N-19 beam. The lifetime of the first 2(+) state was measured with the Koln/NSCL plunger via the recoil distance method to be tau (2(1)(+)) = 22.4 +/- 0.9(stat)(-2.2)(+3.3)(syst) ps, which corresponds to a reduced quadrupole transition strength of B(E2; 2(1)(+) -> 0(1)(+)) = 3.64(-0.14)(+ 0.15)(stat)(-0.47)(+0.40)(syst) e(2)fm(4). In addition, an upper limit on the lifetime of a higher-lying state feeding the 2(1)(+) state was measured to be tau < 4.6 ps. The results are compared to large-scale ab initio no-core shell model calculations using two accurate nucleon-nucleon interactions and the importance-truncation scheme. The comparison provides strong evidence that the inclusion of three-body forces is needed to describe the low-lying excited-state properties of this A = 18 system.

Nyckelord: nuclear shell-model, lifetime measurements, neutrons, beams

Denna post skapades 2012-08-23. Senast ändrad 2014-09-02.
CPL Pubid: 162514


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Institutioner (Chalmers)

Institutionen för fundamental fysik, Subatomär fysik (2005-2013)



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