Nonyrast high-spin states inN=Z 44Ti

Quadrupole collectivity in Ca42 from low-energy Coulomb excitation with AGATA

“…1(b)], where the number of valence particles is lower as compared to the "traditional" regions of superdeformation, and protons and neutrons may occupy the same orbitals. The value of the quadrupole deformation parameter β in the sidebands of 40 Ca [14,15], 36,38,40 Ar [16][17][18][19][20], and 44 Ti [21], as well as 35 Cl [22] nuclei, is between 0.4 and 0.6; see Table I. This is similar to what was previously reported for other mass regions, where superdeformation has been established.…”

SuperdeformedΛhypernuclei with antisymmetrized molecular dynamics

“…For example, in 13 C, it is found that the B is smaller in the clustering state than in the compacting shell-model-like states by more than 3 MeV [4]. In 20 Ne, it is predicted that the B is larger in the shell-model-like ground state than in the negative-parity cluster state [6]. However, this result is different from the cluster model calculation [7].…”

“…It is considered that the SD state is related with the appearance of large shell gaps at a 2 : 1 axis ratio of the nuclear deformation for specific particle numbers. Recently, many SD bands are investigated and identified in nuclei with A ∼ 40 [18][19][20]. For example, in 40 Ca, a SD band is confirmed by the observation of the K π = 0 + band built on the 0 + 3 state lying at 5.21 MeV, while its ground state is spherical due to the double closed-shell structure [19,21].…”

Coexistence of various deformed states and ± clustering in 42Ca

“…In the mass number region A ∼ 40, low-lying normal-deformed (ND) and superdeformed (SD) bands with many-particle-many-hole (mp-mh) configurations have been confirmed experimentally in 36,38,40 Ar [4,12,15], 40 Ca [5], 42 Ca [1,9], and 44 Ti [11]. The SD band in 36 Ar, ND and SD bands in 40 Ca, and SD band in 44 Ti are considered to have configurations of 4p8h, 4p4h, 8p8h, and 8p4h, respectively, relative to the sd-shell doubleclosed structure.…”