Application of the generalized two-center cluster model to 10Be

Abstract

A generalized two-center cluster model (GTCM), including various partitions of the valence nucleons around two alpha-cores, is proposed for studies on the exotic cluster structures of Be isotopes. This model is applied to the 10Be = alpha + alpha + n + n system and the adiabatic energy surfaces for alpha-alpha distances are calculated. It is found that this model naturally describes the formation of the molecular orbitals as well as that of asymptotic cluster states dependeing on their relative distance. In the negative-parity state, a new type of the alpha + 6He cluster structure is also predicted.Comment: 5 pages, 3 figure

6He-triton cluster states in9Li

“…In preceding works [3][4][5][6][7][8][9][10]18], the K π = 0 + 2 band of 10 Be is considered to be a molecular orbital state having two valence neutrons in the molecular σ orbital around the 2α cluster core. In the case that α-α distance is moderate, the configuration (a) in Fig.…”

“…Many of low-lying states of Be isotopes are understood in a molecular orbital picture where a Be nucleus is considered to consist of 2 α's and valence neutron(s) in molecular orbitals around the 2α core [1][2][3][4][5][6][7][8][9][10][11][12][13]. In highly excited states near the He+He threshold energy of 10 Be and 12 Be, well-developed cluster states have been suggested experimentally and theoretically [7,[12][13][14][15][16][17][18][19][20]. Those developed cluster states show two-body cluster structures such as 6 He+ 4 He in 10 Be and 6 He+ 6 He in 12 Be.…”

Novel cluster states in10Be

“…The structures of Be nuclei heavier than 8 Be can be described so well by a 2α core and valence neutrons around it [1][2][3][4][5][6][7][8][9][10]. 10 Be is the lightest even-even neutronrich Be isotope and shows diverse structures composed of 2α plus two valence neutrons, such as molecular orbital structures.…”

16O + 16O + Valence Neutrons in Molecular Orbitals Structures of Positive- and Negative-Parity Superdeformed Bands in 34S

“…Sulfur isotopes are analogs of Be isotopes because those isotopes can form systems consisting of two doubly closed shell nuclei ( 16 O and α for S and Be isotopes, respectively) and valence neutrons. In Be isotopes, structures consisting of α + α + valence neutrons in molecular orbitals are thought to develop in low-lying states, with the valence neutrons in molecular orbitals around two α cores [4][5][6][7][8][9][10][11]. The SD states in 32 S are predicted to contain a large amount of 16 O + 16 O cluster structure components [2,3].…”