Lifetime measurements of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">C</mml:mi><mml:mprescripts /><mml:none /><mml:mn>17</mml:mn></mml:mmultiscripts></mml:math>excited states and three-body and continuum effects

“…Here, we will focus on the electromagnetic properties of 17 C. This nucleus is an interesting halo candidate but has not yet been investigated using Halo EFT. Its continuum properties cannot yet be addressed using standard ab initio methods.…”

Section: Introductionmentioning

confidence: 99%

“…[16] for a calculation of 40 Ca-proton scattering where this approximation is well justified.). Recent calculations in the NCSM also seem to suggest that this nucleus is too large to obtain converged results for its spectrum [17] with the available computational resources. 17 C has a J P = 3/2 + ground state, and two excited states with J P = 1/2 + and 5/2 + [18].…”

Section: Introductionmentioning

confidence: 99%

“…Recent calculations in the NCSM also seem to suggest that this nucleus is too large to obtain converged results for its spectrum [17] with the available computational resources. 17 C has a J P = 3/2 + ground state, and two excited states with J P = 1/2 + and 5/2 + [18]. The neutron separation energy of the ground state of about 0.7 MeV [19] is significantly smaller than the excitation energy of the J P = 0 + 16 C core, which is about 1.8 MeV [20], while the neutron separation energies of the excited states are only of order 0.4-0.5 MeV [17] (see the level scheme in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1). This suggests that 17 C may be amenable to a description using Halo EFT with S-and D-wave neutron-core interactions [21].…”

Section: Introductionmentioning

confidence: 99%

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Halo structure of $^{17}$C

Braun,

Hammer,

Platter

2018

Preprint

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17 C has three states below the 16 C + n threshold with quantum numbers J P = 3/2 + , 1/2 + , 5/2 + . These states have relatively small neutron separation energies compared to the neutron separation and excitation energies of 16 C. This separation of scales motivates our investigation of 17 C in a Halo effective field theory (Halo EFT) with a 16 C core and a valence neutron as degrees of freedom. We discuss various properties of the three states such as electric radii, magnetic moments, electromagnetic transition rates and capture cross sections. In particular, we give predictions for the charge radius and the magnetic moment of the 1/2 + state and for neutron capture on 16 C into this state. Furthermore, we discuss the predictive power of the Halo EFT approach for the 3/2 + and 5/2 + states which are described by a neutron in a D-wave relative to the core.

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