The reactions 36, 38, 40Ar(3He, n)38, 40, 42Ca and 40, 42Ca(3He, n)42, 44Ti

Bohne, W.; Büchs, K.D.; Fuchs, H.; Grabisch, K.; Hilscher, D.; Janetzki, U.; Jahnke, U.; Kluge, H.; Masterson, T.; Morgenstern, H.

doi:10.1016/0375-9474(77)90682-0

Cited by 39 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The discovery of the island of inversion around the neutron rich Mg isotopes, where the nuclear interaction drives strong deformations, shuttering the "traditional" predictions of the shell model, has created new excitement on shape coexistence at the experimental level. Early spectroscopic studies (measurements of α spectroscopic factors and E0 values) in Ar [10] and Ca isotopes [11][12][13] provided strong hints for shape coexistence around the upper end of the sd shell. The search for similar occurrences has been intense in the f p shell, as well, where the protons and neutrons occupy orbitals with similar Fermi energies, giving rise to strong protonneutron correlations.…”

Section: Introductionmentioning

confidence: 99%

The islands of shape coexistence within the Elliott and the proxy-SU(3) Models

Martinou,

Bonatsos,

Mertzimekis

et al. 2021

Preprint

View full text Add to dashboard Cite

A novel dual-shell mechanism for the phenomenon of shape coexistence in nuclei within the Elliott SU(3) and the proxy-SU(3) symmetry is proposed for all mass regions. It is supposed, that shape coexistence is activated by large quadrupole-quadrupole interaction and involves the interchange among the spin-orbit (SO) like shells within nucleon numbers 6-14, 14-28, 28-50, 50-82, 82-126, 126-184, which are being described by the proxy-SU(3) symmetry, and the harmonic oscillator (HO) shells within nucleon numbers 2-8, 8-20, 20-40, 40-70, 70-112, 112-168 of the Elliott SU(3) symmetry. The outcome is, that shape coexistence may occur in certain islands on the nuclear map. The dual-shell mechanism predicts without any free parameters, that nuclei with proton number (Z) or neutron number (N ) between 7-8, 17-20, 34-40, 59-70, 96-112, 146-168 are possible candidates for shape coexistence. In the light nuclei the nucleons flip from the HO shell to the neighboring SO-like shell, which means, that particle excitations occur. For this mass region, the predicted islands of shape coexistence, coincide with the islands of inversion. But in medium mass and heavy nuclei, in which the nucleons inhabit the SO-like shells, shape coexistence is accompanied by a merging of the SO-like shell with the open HO shell. The shell merging can be accomplished by the outer product of the SU(3) irreps of the two shells and represents the unificaton of the HO shell with the SO-like shell.

show abstract

Section: Introductionmentioning

confidence: 99%

The islands of shape coexistence within the Elliott and the proxy-SU(3) Models

Martinou,

Bonatsos,

Mertzimekis

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Emergence of various structures in low-lying levels in 40 Ca indicates shape coexistence. The main configurations for the ND and SD structures are 4p-4h, and 8p-8h excitations across the N, Z = 20 shell gap, respectively [15][16][17][18][19][20]. The transition quadrupole moments for the low-spin and high-spin part of the SD band were reported to have a significant difference, indicating the mixing of lower-spin states with a less deformed configuration [14].…”

mentioning

confidence: 99%