Suppressed electric quadrupole collectivity in 49Ti

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

doi:10.1016/j.physletb.2024.138856

Suppressed electric quadrupole collectivity in ⁴⁹Ti

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

^*Corresponding author for this work

Department of Nuclear Physics & Accelerator Applications

Research output: Contribution to journal › Letter › peer-review

Abstract

Single-step Coulomb excitation of Ti-46,Ti-48,Ti-49,Ti-50 is presented. A complete set of E2 matrix elements for the quintuplet of states in Ti-49, centred on the 2+ core excitation, was measured for the first time. A total of nine E2 matrix elements are reported, four of which were previously unknown. Ti-49(22)27 shows a 20% quenching in electric quadrupole transition strength as compared to its semi-magic Ti-50(22)28 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 Ti-49-Ti-50 pair (i.e., approximate single-j 0f7/2 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.

Original language	English
Article number	138856
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	855
DOIs	https://doi.org/10.1016/j.physletb.2024.138856
Publication status	Published - Aug 2024

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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., ... Yadav, R. B. (2024). Suppressed electric quadrupole collectivity in ⁴⁹Ti. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 855, Article 138856. https://doi.org/10.1016/j.physletb.2024.138856

@article{45660426cea94792ae544617bffe24c4,

title = "Suppressed electric quadrupole collectivity in 49Ti",

abstract = "Single-step Coulomb excitation of Ti-46,Ti-48,Ti-49,Ti-50 is presented. A complete set of E2 matrix elements for the quintuplet of states in Ti-49, centred on the 2+ core excitation, was measured for the first time. A total of nine E2 matrix elements are reported, four of which were previously unknown. Ti-49(22)27 shows a 20% quenching in electric quadrupole transition strength as compared to its semi-magic Ti-50(22)28 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 Ti-49-Ti-50 pair (i.e., approximate single-j 0f7/2 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.",

keywords = "Core excitations, Coulomb-excitation, Even titanium, Generalized seniority, Npnn scheme, Nuclei, Shell-model description, Spectroscopy",

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

note = "Publisher Copyright: {\textcopyright} 2024 The Author(s)",

year = "2024",

month = aug,

doi = "10.1016/j.physletb.2024.138856",

language = "English",

volume = "855",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

Gray, TJ, Allmond, JM, Benetti, C, Wibisono, C, Baby, L, Gargano, A, Miyagi, T, Macchiavelli, AO, Stuchbery, AE, Wood, JL, Ajayi, S, Aragon, J, Asher, BW, Barber, P, Bhattacharya, S, Boisseau, R, Christie, JM, Conley, AL, De Rosa, P, Dowling, DT, Esparza, C, Gibbons, J, Hanselman, K, Holt, JD, Lopez-Caceres, S, Lopez Saavedra, E, McCann, GW, Morelock, A, Kelly, B, King, TT, Rasco, BC, Sitaraman, V, Tabor, SL, Temanson, E, Tripathi, V, Wiedenhöver, I & Yadav, RB 2024, 'Suppressed electric quadrupole collectivity in ⁴⁹Ti', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 855, 138856. https://doi.org/10.1016/j.physletb.2024.138856

TY - JOUR

T1 - Suppressed electric quadrupole collectivity in 49Ti

AU - Gray, T. J.

AU - Allmond, J. M.

AU - Benetti, C.

AU - Wibisono, C.

AU - Baby, L.

AU - Gargano, A.

AU - Miyagi, T.

AU - Macchiavelli, A. O.

AU - Stuchbery, A. E.

AU - Wood, J. L.

AU - Ajayi, S.

AU - Aragon, J.

AU - Asher, B. W.

AU - Barber, P.

AU - Bhattacharya, S.

AU - Boisseau, R.

AU - Christie, J. M.

AU - Conley, A. L.

AU - De Rosa, P.

AU - Dowling, D. T.

AU - Esparza, C.

AU - Gibbons, J.

AU - Hanselman, K.

AU - Holt, J. D.

AU - Lopez-Caceres, S.

AU - Lopez Saavedra, E.

AU - McCann, G. W.

AU - Morelock, A.

AU - Kelly, B.

AU - King, T. T.

AU - Rasco, B. C.

AU - Sitaraman, V.

AU - Tabor, S. L.

AU - Temanson, E.

AU - Tripathi, V.

AU - Wiedenhöver, I.

AU - Yadav, R. B.

PY - 2024/8

Y1 - 2024/8

N2 - Single-step Coulomb excitation of Ti-46,Ti-48,Ti-49,Ti-50 is presented. A complete set of E2 matrix elements for the quintuplet of states in Ti-49, centred on the 2+ core excitation, was measured for the first time. A total of nine E2 matrix elements are reported, four of which were previously unknown. Ti-49(22)27 shows a 20% quenching in electric quadrupole transition strength as compared to its semi-magic Ti-50(22)28 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 Ti-49-Ti-50 pair (i.e., approximate single-j 0f7/2 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.

AB - Single-step Coulomb excitation of Ti-46,Ti-48,Ti-49,Ti-50 is presented. A complete set of E2 matrix elements for the quintuplet of states in Ti-49, centred on the 2+ core excitation, was measured for the first time. A total of nine E2 matrix elements are reported, four of which were previously unknown. Ti-49(22)27 shows a 20% quenching in electric quadrupole transition strength as compared to its semi-magic Ti-50(22)28 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 Ti-49-Ti-50 pair (i.e., approximate single-j 0f7/2 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.

KW - Core excitations

KW - Coulomb-excitation

KW - Even titanium

KW - Generalized seniority

KW - Npnn scheme

KW - Nuclei

KW - Shell-model description

KW - Spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=85198512878&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2024.138856

DO - 10.1016/j.physletb.2024.138856

M3 - Letter

AN - SCOPUS:85198512878

SN - 0370-2693

VL - 855

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 138856

ER -

Suppressed electric quadrupole collectivity in ⁴⁹Ti

Abstract

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