Systematics of 2+ states in C isotopes from the no-core shell model
Artikel i vetenskaplig tidskrift, 2013

We study low-lying states of even carbon isotopes in the range A = 10-20 within the large-scale no-core shell model. Using several accurate nucleon-nucleon (NN) as well as NN plus three-nucleon (NNN) interactions, we calculate excitation energies of the lowest 2(+) state, the electromagnetic B(E2; 2(1)(+) -> 0(1)(+)) transition rates, and the 2(1)(+) quadrupole moments as well as selected electromagnetic transitions among other states. Recent experimental campaigns to measure 2(+)-state lifetimes indicate an interesting evolution of nuclear structure that pose a challenge to reproduce theoretically from first principles. Our calculations do not include any effective charges or other fitting parameters. However, calculated results extrapolated to infinite model spaces are also presented. The model-dependence of those results is discussed. Overall, we find good agreement with the experimentally observed trends, although our extrapolated B(E2; 2(1)(+) -> 0(1)(+)) value for C-16 is lower compared to the most recent measurements. Relative transition strengths from higher excited states are investigated and the influence of NNN forces is discussed. In particular for 16C we find a remarkable sensitivity of the transition rates from higher excited states to the details of the nuclear interactions.

nuclei

nuclear theory

nuclear experiment

Författare

Christian Forssen

Chalmers, Teknisk fysik, Subatomär fysik

R. Roth

Technische Universität Darmstadt

P. Navratil

TRIUMF

Lawrence Livermore National Laboratory

Journal of Physics G: Nuclear and Particle Physics

0954-3899 (ISSN)

Vol. 40 5 055105-

Ämneskategorier

Subatomär fysik

Fysik

Fundament

Grundläggande vetenskaper

DOI

10.1088/0954-3899/40/5/055105