Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect - INSPIRE

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Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect

Yutaka Utsuno
(
- JAEA, Ibaraki and
- Tokyo U.
)
,
Takaharu Otsuka
(
- Tokyo U. and
- Michigan State U., NSCL and
- Michigan State U.
)
,
B.Alex Brown
(
- Michigan State U., NSCL and
- Michigan State U.
)
,
Michio Honma
(
- Aizu U.
)
,
Takahiro Mizusaki
(
- Senshu U., Tokyo
)

Oct, 2012

6 pages

Published in:

Phys.Rev.C 86 (2012) 051301

e-Print:

1210.5469 [nucl-th]

DOI:

10.1103/PhysRevC.86.051301

View in:

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Abstract: (arXiv)

We show how shape transitions in the neutron-rich exotic Si and S isotopes occur in terms of shell-model calculations with a newly constructed Hamiltonian based on V_MU interaction. We first compare the calculated spectroscopic-strength distributions for the proton 0d_5/2,3/2 and 1s_1/2 orbitals with results extracted from a 48Ca(e,e'p) experiment to show the importance of the tensor-force component of the Hamiltonian. Detailed calculations for the excitation energies, B(E2) and two-neutron separation energies for the Si and S isotopes show excellent agreement with experimental data. The potential energy surface exhibits rapid shape transitions along the isotopic chains towards N=28 that are different for Si and S. We explain the results in terms of an intuitive picture involving a Jahn-Teller-type effect that is sensitive to the tensor-force-driven shell evolution. The closed sub-shell nucleus 42Si is a particularly good example of how the tensor-force-driven Jahn-Teller mechanism leads to a strong oblate rather than spherical shape.

Note:

6 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:1201.4077

21.60.Cs
21.10.Pc
27.40.+z
21.30.Fe

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Figures(6)

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