Suppressed electric quadrupole collectivity in 49Ti

Gray, T. J.; Allmond, J. M.; Benetti, C.; Wibisono, C.; Baby, L.; Gargano, A.; Miyagi, T.; Macchiavelli, A. O.; Stuchbery, A. E.; Wood, J. L.; Ajayi, S.; Aragon, J.; Asher, B. W.; Barber, P.; Bhattacharya, S.; Boisseau, R.; Christie, J. M.; Conley, A. L.; De Rosa, P.; Dowling, D. T.; Esparza, C.; Gibbons, J.; Hanselman, K.; Holt, J. D.; Lopez-Caceres, S.; Lopez Saavedra, E.; McCann, G. W.; Morelock, A.; Kelly, B.; King, T. T.; Rasco, B. C.; Sitaraman, V.; Tabor, S. L.; Temanson, E.; Tripathi, V.; Wiedenhöver, I.; Yadav, R. B.

doi:10.1016/j.physletb.2024.138856

Suppressed electric quadrupole collectivity in ⁴⁹Ti

Journal Article · Thu Aug 01 00:00:00 EDT 2024 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2024.138856· OSTI ID:2406797

^[1]; ^[2]; Benetti, C. ^[3]; Wibisono, C. ^[3]; Baby, L. ^[3]; ^[4]; ^[5]; Macchiavelli, A. O. ^[2]; Stuchbery, A. E. ^[6]; Wood, J. L. ^[7]; ^[3]; Aragon, J. ^[3]; Asher, B. W. ^[8]; Barber, P. ^[3]; ^[3]; Boisseau, R. ^[3]; Christie, J. M. ^[8]; ^[3]; De Rosa, P. ^[3]; ^[2] more »

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Florida State Univ., Tallahassee, FL (United States)
Complesso Universitario di Monte S. Angelo, Napoli (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Napoli (Italy)
Darmstadt Univ. of Technology (Germany); GSI-Darmstadt (Germany). ExtreMe Matter Inst. (EMMI); Max Planck Inst. fuer Kernphysik, Heidelberg (Germany)
Australian National Univ., Canberra (Australia)
Georgia Institute of Technology, Atlanta, GA (United States)
Univ. of Tennessee, Knoxville, TN (United States)
TRIUMF, Vancouver, BC (Canada); McGill Univ., Montreal, QC (Canada)
Louisiana State Univ., Baton Rouge, LA (United States)
South Carolina State Univ., Orangeburg, SC (United States)

Single-step Coulomb excitation of ^46,48,49,50Ti is presented. A complete set of E2 matrix elements for the quintuplet of states in ⁴⁹Ti, centred on the core excitation, was measured for the first time. A total of nine E2 matrix elements are reported, four of which were previously unknown. $$^{49}_{22}$$Ti₂₇ shows a 20% quenching in electric quadrupole transition strength as compared to its semi-magic $$^{50}_{22}$$Ti₂₈ neighbour. This 20% quenching, while empirically unprecedented, can be explained with a remarkably simple two-state mixing model, which is also consistent with other ground-state properties such as the magnetic dipole moment and electric quadrupole moment. A connection to nucleon transfer data and the quenching of single-particle strength is also demonstrated. The simplicity of the ⁴⁹Ti-⁵⁰Ti pair (i.e., approximate single-j 0_7/2 valence space and isolation of yrast states from non-yrast states) provides a unique opportunity to disentangle otherwise competing effects in the ground-state properties of atomic nuclei, the emergence of collectivity, and the role of proton-neutron interactions.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Australian Research Council; European Research Council (ERC); German Research Foundation (DFG); NSERC; National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2406797

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 855; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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