Octupole strength in the neutron-rich calcium isotopes

Abstract

Low-lying excited states of the neutron-rich calcium isotopes 48−52 Ca have been studied via γ-ray spectroscopy following inverse-kinematics proton scattering on a liquid hydrogen target using the GRETINA γ-ray tracking array. The energies and strengths of the octupole states in these isotopes are remarkably constant, indicating that these states are dominated by proton excitations.2

Recent Progress in Gamow Shell Model Calculations of Drip Line Nuclei

“…For 56,58,60 Ca, the two calculations give similar results. The calculated two-neutron separation energy S 2n is in good agreement with experimental data [78,92] and other theoretical calculations, e.g., with DFT [93] and IM-SRG [94] calculations. The large decrease in S 2n at neutron number N = 32 and 34 indicate that subshell closures occur therein, which has also been suggested from experiments [90,91] and theoretical calculations [94][95][96].…”

“…The realistic GSM based on the realistic CD-Bonn [55] interaction has also been performed to investigate the properties of neutron-rich calcium isotopes up to the drip line. [78,92], and calculations obtained with SV-min density-functional theory (DFT) [93] and multireference IM-SRG (S 2n only) [94]. The S n calculations end at 60 Ca because odd isotopes heavier than 60 Ca become unbound in our GSM calculations (with permissions from Ref.…”

“…The calculated one-neutron separation energies S n and two-neutron separation energies S 2n are shown in Figure 8 and compared with experimental data [78,92], DFT [93], and IM-SRG [94] calculations. The calculated one-neutron separation energies S n show that 57 Ca is the heaviest odd-mass bound calcium isotope, which is consistent with MBPT calculations [95].…”

“…Figure8. Calculated one-neutron separation energies S n (a) and two-neutron separation energies S 2n (b), compared with data[78,92], and calculations obtained with SV-min density-functional theory (DFT)[93] and multireference IM-SRG (S 2n only)[94]. The S n calculations end at60 Ca because odd isotopes heavier than60 Ca become unbound in our GSM calculations (with permissions from Ref [47]…”

Low-spin particle/hole-core excitations in $^{41,47,49}$Ca isotopes studied by cold-neutron capture reactions

“…The structure of calcium isotopes between the doublymagic 40 Ca (N =20) and 48 Ca (N =28) nuclei has been the subject of many experimental studies over the past decades [1][2][3][4][5][6][7][8][9][10][11][12][13]. With six stable isotopes, calcium plays a crucial role in stellar nucleosynthesis [14][15][16].…”