Lowest 2+,T=2states in20Mg and

H. T. Fortune

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R. Sherr

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B. A. Brown

³

TheMg30(t,p)Mg32“puzzle” reexamined

“…It is clear that the inclusion of the third state, namely the 4p4h configuration resolves the "puzzle" of 32 Mg proposed by Fortune [5,8], and the 32 Mg ground state emerges naturally as dominated at the 95% level by intruder (2p2h or 4p4h) configurations. Within a simple three-level model, self-consistent solutions exist that provide good agreement with the experimental excitation energy of the 0 + 2 state, the cross-section ratio σ 0 + 2 /σ 0 + 1 , Fig.…”

“…Inspired by these results, we have revisited the analysis of Fortune [5,8], extending it now to a three-level mixing.…”

Description of carbon isotopes within relativistic Hartree-Fock-Bogoliubov theory

“…One of the representatives is the nuclear halo structure characterized by a dilute matter distribution contributed by several (in general two) loosely bound valence neutrons (or protons) surrounding a condensed core, which was first found in 11 Li [5]. As the typical light nuclei, the Carbon isotopes have been devoted many efforts to probing the possible halo structure [6][7][8] and specifically recent measured reaction cross section of 22 C [9] seems to assert a new two-neutron halo structure, which has also attracted fairly large interests from the community [10][11][12].…”

Halo nuclei, stepping stones across the drip-lines

“…The pioneering experiments by Tanihata et al [8] and their subsequent explanation by Hansen and Jonson [9] revealed a large matter radius of 11 Li, which has been explained by a two-neutron halo being formed in the classically forbidden region of the 9 Li core potential, induced by the extremely low two-neutron separation energy of only 300 keV. The large size of the system leads to an increase in the cross section of the system when passing through matter in a transmission measurement.…”

“…Figure 2 shows a recent example [6] of such an exploratory study of the two-neutron halo 22 C nucleus. Being conceptually easy to understand, a quantitative understanding [11] of these measurements requires taking the correlations in the three-body system into account. As Three-body scattering picture following the arguments given in [10,21].…”