Gaussian expansion methods under the absorbing boundary condition

αcluster structures in unbound states in19Ne

“…In the previous analyses on 19 F [9, 11], the so-called weak coupling states of the proton hole are confirmed above the α threshold energy. For example, in the α + 15 N system, a proton hole inside of the 16 O cores loosely couples to the relative motion of the binary cluster cores.…”

“…The 19 F nucleus is the one proton deficient system of 20 Ne, and the rotational bands of α + 15 N and t + 16 O, which are calculated from the folding type potential, were clearly assigned to the energy levels observed in the α and t transfer reactions [8]. The energy levels in 19 F have also been analyzed in the more sophisticated models, such as the full microscopic α + 15 N cluster model on the basis of the generator coordinate method (GCM) [9,10] and the orthogonalized condition model (OCM) of the (t + 16 O) + (α + 15 N) coupled-channels [11]. In the coupled-channels analysis, t and α cluster bands are clearly identified although a considerable mixture of these two configurations occurs.…”

“…For example, there is a recent study of 11 B = α + α + t, corresponding to a proton hole system of 12 C = 3α [7]. Pioneering work of the hole system is the study of the 19 F nucleus [8][9][10][11]. The 19 F nucleus is the one proton deficient system of 20 Ne, and the rotational bands of α + 15 N and t + 16 O, which are calculated from the folding type potential, were clearly assigned to the energy levels observed in the α and t transfer reactions [8].…”

“…For example, in the α + 15 N system, a proton hole inside of the 16 O cores loosely couples to the relative motion of the binary cluster cores. In a naive consideration, the weak coupling state of the hole in 16 O and the α particle is also expected in the neutron-deficient system, α + 15 O in 19 Ne [10,11]. In fact, a formation of α + 15 O in 19 Ne was discussed from the perspective of 19 F - 19 Ne Coulomb displacement energy [8,11].…”

“…Cluster structures in 19 Ne are studied by the microscopic and macroscopic cluster models. In the microscopic calculation, the coupled-channels problem of ( 3 He+ 16 O) + (α+ 15 O) is solved, and the adiabatic energy surfaces, which are the series of the energy eigenvalues as a function of the He-O distance, are investigated.…”