Shell evolution approaching the N=20 island of inversion: Structure of Mg 29

A. Matta; W. N. Catford; N. A. Orr; J. Henderson; P. Ruotsalainen; G. Hackman; A. B. Garnsworthy; F. Delaunay; R. Wilkinson; G. Lotay; Naofumi Tsunoda; Takaharu Otsuka; A. J. Knapton; G. C. Ball; N. Bernier; C. Burbadge; A. Chester; D. S. Cross; S. Cruz; C. Aa Diget; T. Domingo; T. E. Drake; L. J. Evitts; F. H. Garcia; S. Hallam; E. Macconnachie; M. Moukaddam; D. Muecher; E. Padilla-Rodal; O. Paetkau; J. Park; J. L. Pore; U. Rizwan; J. Smallcombe; J. K. Smith; K. Starosta; C. E. Svensson; J. Williams; M. Williams

doi:10.1103/PhysRevC.99.044320

Shell evolution approaching the N=20 island of inversion: Structure of Mg 29

A. Matta^*, W. N. Catford, N. A. Orr, J. Henderson, P. Ruotsalainen, G. Hackman, A. B. Garnsworthy, F. Delaunay, R. Wilkinson, G. Lotay, Naofumi Tsunoda, Takaharu Otsuka, A. J. Knapton, G. C. Ball, N. Bernier, C. Burbadge, A. Chester, D. S. Cross, S. Cruz, C. Aa DigetT. Domingo, T. E. Drake, L. J. Evitts, F. H. Garcia, S. Hallam, E. Macconnachie, M. Moukaddam, D. Muecher, E. Padilla-Rodal, O. Paetkau, J. Park, J. L. Pore, U. Rizwan, J. Smallcombe, J. K. Smith, K. Starosta, C. E. Svensson, J. Williams, M. Williams

^*Corresponding author for this work

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

Abstract

The island of inversion for neutron-rich nuclei in the vicinity of N=20 has become the testing ground par excellence for our understanding and modeling of shell evolution with isospin. In this context, the structure of the transitional nucleus Mg29 is critical. The first quantitative measurements of the single-particle structure of Mg29 are reported, using data from the d(Mg28, p γ)Mg29 reaction. Two key states carrying significant 3 (f-wave) strength were identified at 2.40±0.10 (Jπ=5/2-) and 4.28±0.04 MeV (7/2-). New state-of-the-art shell-model calculations have been performed and the predictions are compared in detail with the experimental results. While the two lowest 7/2- levels are well described, the sharing of single-particle strength disagrees with experiment for both the 3/2- and 5/2- levels and there appear to be general problems with configurations involving the p3/2 neutron orbital and core-excited components. These conclusions are supported by an analysis of the neutron occupancies in the shell-model calculations.

Original language	English
Article number	044320
Number of pages	14
Journal	Physical Review C
Volume	99
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.99.044320
Publication status	Published - 29 Apr 2019

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PhysRevC.99.044320
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Matta, A., Catford, W. N., Orr, N. A., Henderson, J., Ruotsalainen, P., Hackman, G., Garnsworthy, A. B., Delaunay, F., Wilkinson, R., Lotay, G., Tsunoda, N., Otsuka, T., Knapton, A. J., Ball, G. C., Bernier, N., Burbadge, C., Chester, A., Cross, D. S., Cruz, S., ... Williams, M. (2019). Shell evolution approaching the N=20 island of inversion: Structure of Mg 29. Physical Review C, 99(4), Article 044320. https://doi.org/10.1103/PhysRevC.99.044320

@article{87e5659880ea41eaabe3e4a8cb9a394d,

title = "Shell evolution approaching the N=20 island of inversion: Structure of Mg 29",

abstract = "The island of inversion for neutron-rich nuclei in the vicinity of N=20 has become the testing ground par excellence for our understanding and modeling of shell evolution with isospin. In this context, the structure of the transitional nucleus Mg29 is critical. The first quantitative measurements of the single-particle structure of Mg29 are reported, using data from the d(Mg28, p γ)Mg29 reaction. Two key states carrying significant 3 (f-wave) strength were identified at 2.40±0.10 (Jπ=5/2-) and 4.28±0.04 MeV (7/2-). New state-of-the-art shell-model calculations have been performed and the predictions are compared in detail with the experimental results. While the two lowest 7/2- levels are well described, the sharing of single-particle strength disagrees with experiment for both the 3/2- and 5/2- levels and there appear to be general problems with configurations involving the p3/2 neutron orbital and core-excited components. These conclusions are supported by an analysis of the neutron occupancies in the shell-model calculations.",

author = "A. Matta and Catford, {W. N.} and Orr, {N. A.} and J. Henderson and P. Ruotsalainen and G. Hackman and Garnsworthy, {A. B.} and F. Delaunay and R. Wilkinson and G. Lotay and Naofumi Tsunoda and Takaharu Otsuka and Knapton, {A. J.} and Ball, {G. C.} and N. Bernier and C. Burbadge and A. Chester and Cross, {D. S.} and S. Cruz and Diget, {C. Aa} and T. Domingo and Drake, {T. E.} and Evitts, {L. J.} and Garcia, {F. H.} and S. Hallam and E. Macconnachie and M. Moukaddam and D. Muecher and E. Padilla-Rodal and O. Paetkau and J. Park and Pore, {J. L.} and U. Rizwan and J. Smallcombe and Smith, {J. K.} and K. Starosta and Svensson, {C. E.} and J. Williams and M. Williams",

note = "{\textcopyright}2019 American Physical Society. Uploaded in accordance with the publisher{\textquoteright}s self-archiving policy. Further copying may not be permitted; contact the publisher for details",

year = "2019",

month = apr,

day = "29",

doi = "10.1103/PhysRevC.99.044320",

language = "English",

volume = "99",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "4",

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Matta, A, Catford, WN, Orr, NA, Henderson, J, Ruotsalainen, P, Hackman, G, Garnsworthy, AB, Delaunay, F, Wilkinson, R, Lotay, G, Tsunoda, N, Otsuka, T, Knapton, AJ, Ball, GC, Bernier, N, Burbadge, C, Chester, A, Cross, DS, Cruz, S, Diget, CA, Domingo, T, Drake, TE, Evitts, LJ, Garcia, FH, Hallam, S, Macconnachie, E, Moukaddam, M, Muecher, D, Padilla-Rodal, E, Paetkau, O, Park, J, Pore, JL, Rizwan, U, Smallcombe, J, Smith, JK, Starosta, K, Svensson, CE, Williams, J & Williams, M 2019, 'Shell evolution approaching the N=20 island of inversion: Structure of Mg 29', Physical Review C, vol. 99, no. 4, 044320. https://doi.org/10.1103/PhysRevC.99.044320

TY - JOUR

T1 - Shell evolution approaching the N=20 island of inversion

T2 - Structure of Mg 29

AU - Matta, A.

AU - Catford, W. N.

AU - Orr, N. A.

AU - Henderson, J.

AU - Ruotsalainen, P.

AU - Hackman, G.

AU - Garnsworthy, A. B.

AU - Delaunay, F.

AU - Wilkinson, R.

AU - Lotay, G.

AU - Tsunoda, Naofumi

AU - Otsuka, Takaharu

AU - Knapton, A. J.

AU - Ball, G. C.

AU - Bernier, N.

AU - Burbadge, C.

AU - Chester, A.

AU - Cross, D. S.

AU - Cruz, S.

AU - Diget, C. Aa

AU - Domingo, T.

AU - Drake, T. E.

AU - Evitts, L. J.

AU - Garcia, F. H.

AU - Hallam, S.

AU - Macconnachie, E.

AU - Moukaddam, M.

AU - Muecher, D.

AU - Padilla-Rodal, E.

AU - Paetkau, O.

AU - Park, J.

AU - Pore, J. L.

AU - Rizwan, U.

AU - Smallcombe, J.

AU - Smith, J. K.

AU - Starosta, K.

AU - Svensson, C. E.

AU - Williams, J.

AU - Williams, M.

PY - 2019/4/29

Y1 - 2019/4/29

N2 - The island of inversion for neutron-rich nuclei in the vicinity of N=20 has become the testing ground par excellence for our understanding and modeling of shell evolution with isospin. In this context, the structure of the transitional nucleus Mg29 is critical. The first quantitative measurements of the single-particle structure of Mg29 are reported, using data from the d(Mg28, p γ)Mg29 reaction. Two key states carrying significant 3 (f-wave) strength were identified at 2.40±0.10 (Jπ=5/2-) and 4.28±0.04 MeV (7/2-). New state-of-the-art shell-model calculations have been performed and the predictions are compared in detail with the experimental results. While the two lowest 7/2- levels are well described, the sharing of single-particle strength disagrees with experiment for both the 3/2- and 5/2- levels and there appear to be general problems with configurations involving the p3/2 neutron orbital and core-excited components. These conclusions are supported by an analysis of the neutron occupancies in the shell-model calculations.

AB - The island of inversion for neutron-rich nuclei in the vicinity of N=20 has become the testing ground par excellence for our understanding and modeling of shell evolution with isospin. In this context, the structure of the transitional nucleus Mg29 is critical. The first quantitative measurements of the single-particle structure of Mg29 are reported, using data from the d(Mg28, p γ)Mg29 reaction. Two key states carrying significant 3 (f-wave) strength were identified at 2.40±0.10 (Jπ=5/2-) and 4.28±0.04 MeV (7/2-). New state-of-the-art shell-model calculations have been performed and the predictions are compared in detail with the experimental results. While the two lowest 7/2- levels are well described, the sharing of single-particle strength disagrees with experiment for both the 3/2- and 5/2- levels and there appear to be general problems with configurations involving the p3/2 neutron orbital and core-excited components. These conclusions are supported by an analysis of the neutron occupancies in the shell-model calculations.

UR - http://www.scopus.com/inward/record.url?scp=85065292173&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.99.044320

DO - 10.1103/PhysRevC.99.044320

M3 - Article

AN - SCOPUS:85065292173

SN - 2469-9985

VL - 99

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 044320

ER -

Shell evolution approaching the N=20 island of inversion: Structure of Mg 29

Abstract

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