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Shell evolution of N=40 isotones towards Ca-60: First spectroscopy of Ti-62
RIKEN, Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0003-0212-7497
Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
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Number of Authors: 842020 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 800, article id 135071Article in journal (Refereed) Published
Abstract [en]

Excited states in the N = 40 isotone Ti-62 were populated via the V-63( p, 2p)Ti-62 reaction at similar to 200MeV/nucleonat the Radioactive Isotope Beam Factory and studied using gamma-ray spectroscopy. The energies of the 2(1)(+) -> 0(gs)(+) and 4(1)(+) -> 2(1)(+) transitions, observed here for the first time, indicate a deformed Ti-62 ground state. These energies are increased compared to the neighboring Cr-64 and Fe-66 isotones, suggesting a small decrease of quadrupole collectivity. The present measurement is well reproduced by large-scale shell-model calculations based on effective interactions, while ab initio and beyond mean-field calculations do not yet reproduce our findings. The shell-model calculations for Ti-62 show a dominant configuration with four neutrons excited across the N = 40 gap. Likewise, they indicate that the N = 40 island of inversion extends down to Z = 20, disfavoring a possible doubly magic character of the elusive Ca-60.

Place, publisher, year, edition, pages
ELSEVIER , 2020. Vol. 800, article id 135071
Keywords [en]
Shell evolution, Radioactive beams, Gamma-ray spectroscopy
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-266929DOI: 10.1016/j.physletb.2019.135071ISI: 000503832500053Scopus ID: 2-s2.0-85074726928OAI: oai:DiVA.org:kth-266929DiVA, id: diva2:1390970
Note

QC 20200203

Available from: 2020-02-03 Created: 2020-02-03 Last updated: 2020-02-03Bibliographically approved

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