Level structures of $^{56,58}$Ca cast doubt on a doubly magic $^{60}$Ca - INSPIRE

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Level structures of $^{56,58}$ Ca cast doubt on a doubly magic $^{60}$ Ca

S. Chen
(
- Hong Kong U. and
- Nishina Ctr., RIKEN and
- Peking U., SKLNPT
)
,
F. Browne
(
- Nishina Ctr., RIKEN
)
,
P. Doornenbal
(
- Nishina Ctr., RIKEN
)
,
J. Lee
(
- Hong Kong U.
)
,
A. Obertelli
(
- Darmstadt, Tech. U. and
- IRFU, Saclay and
- Nishina Ctr., RIKEN
)

Jun 23, 2023

8 pages

Published in:

Phys.Lett.B 843 (2023) 138025

Published: Jun 23, 2023

e-Print:

2307.07077 [nucl-ex]

DOI:

10.1016/j.physletb.2023.138025 (publication)

View in:

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Abstract: (Elsevier B.V.)

Gamma decays were observed in ⁵⁶Ca and ⁵⁸Ca following quasi-free one-proton knockout reactions from ^57,59Sc beams at ≈200 MeV/nucleon. For ⁵⁶Ca, a γ ray transition was measured to be 1456(12) keV, while for ⁵⁸Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the

2_{1}^{+} \to 0_{gs}^{+}

decays, and were compared to results from ab initio and conventional shell-model approaches. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for

2_{1}^{+}

level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the N = 34 shell. Its constituents, the

0 f_{5 / 2}

and

0 g_{9 / 2}

orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic ⁶⁰Ca and potentially drives the dripline of Ca isotopes to ⁷⁰Ca or even beyond.

Note:

8 pages, 3 figures

Shell evolution
Ray spectroscopy

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