Cross-shell excitations in Ca 46 studied with fusion reactions induced by a reaccelerated rare isotope beam

J. Ash*, H. Iwasaki, T. Mijatović, T. Budner, R. Elder, B. Elman, M. Friedman, A. Gade, M. Grinder, J. Henderson, B. Longfellow, A. Revel, D. Rhodes, M. Spieker, Y. Utsuno, D. Weisshaar, C. Y. Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Discovering unexplored high-spin states in neutron-rich nuclei can open up a new direction to study band structure and the associated shell structure in isospin-asymmetric many-body systems. However, experimental reach has so far been limited to neutron-deficient or stable nuclei which are preferentially produced in fusion reactions used in such studies. Here, we report the first γ-ray spectroscopy with fusion reactions using a reaccelerated rare-isotope beam of K45 performed at the ReA3 facility of the National Superconducting Cyclotron Laboratory. Using particle and γ-ray coincidence techniques, three new higher-lying states around 6 MeV and five new γ-ray transitions were identified for Ca46, suggesting three independent band structures formed from different particle-hole configurations. The rotational-like band built on the 02+ state is established up to the tentatively assigned 62+ state. New results are compared to large-scale shell model calculations, confirming the validity of the effective interaction describing particle-hole excitations across the Z=20 and N=28 shell gaps in the vicinity of doubly magic Ca48.

Original languageAmerican English
Article numberL051302
JournalPhysical Review C
Volume103
Issue number5
DOIs
StatePublished - May 2021
Externally publishedYes

Bibliographical note

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© 2021 American Physical Society.

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