Isospin symmetry in B(E2) values: Coulomb excitation study of 21Mg

P. Ruotsalainen; J. Henderson; G. Hackman; G.H. Sargsyan; K.D. Launey; A. Saxena; P.C. Srivastava; S.R. Stroberg; T. Grahn; J. Pakarinen; G.C. Ball; R. Julin; P.T. Greenlees; J. Smallcombe; C. Andreoiu; N. Bernier; M. Bowry; M. Buckner; R. Caballero-Folch; A. Chester; S. Cruz; L.J. Evitts; R. Frederick; A.B. Garnsworthy; M. Holl; A. Kurkjian; D. Kisliuk; K.G. Leach; E. McGee; J. Measures; D. Mücher; J. Park; F. Sarazin; J.K. Smith; D. Southall; K. Starosta; C.E. Svensson; K. Whitmore; M. Williams; C.Y. Wu

doi:10.1103/PhysRevC.99.051301

Isospin symmetry in B(E2) values: Coulomb excitation study of ²¹Mg

P. Ruotsalainen^*, J. Henderson, G. Hackman, G.H. Sargsyan, K.D. Launey, A. Saxena, P.C. Srivastava, S.R. Stroberg, T. Grahn, J. Pakarinen, G.C. Ball, R. Julin, P.T. Greenlees, J. Smallcombe, C. Andreoiu, N. Bernier, M. Bowry, M. Buckner, R. Caballero-Folch, A. ChesterS. Cruz, L.J. Evitts, R. Frederick, A.B. Garnsworthy, M. Holl, A. Kurkjian, D. Kisliuk, K.G. Leach, E. McGee, J. Measures, D. Mücher, J. Park, F. Sarazin, J.K. Smith, D. Southall, K. Starosta, C.E. Svensson, K. Whitmore, M. Williams, C.Y. Wu

^*Corresponding author for this work

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

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Abstract

The T_z = -3/2 nucleus ²¹Mg has been studied by Coulomb excitation on ¹⁹⁶Pt and ¹¹⁰Pd targets. A 205.6(1)-keV γ-ray transition resulting from the Coulomb excitation of the 5/2⁺ ground state to the first excited 1/2⁺ state in ²¹Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 1/2⁺ state yield an adopted value of B(E2;5/2⁺→1/2⁺)=13.3(4) W.u. A new excited state at 1672(1) keV with tentative 92+ assignment was also identified in ²¹Mg. This work demonstrates a large difference in the B(E2;5/2⁺→1/2⁺) value between T=3/2, A=21 mirror nuclei. The difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern ab initio nuclear structure calculations, which have recently become applicable in the sd shell.

Original language	English
Article number	051301
Journal	Physical Review C
Volume	99
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.99.051301
Publication status	Published - 6 May 2019
Externally published	Yes

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Ruotsalainen, P., Henderson, J., Hackman, G., Sargsyan, G. H., Launey, K. D., Saxena, A., Srivastava, P. C., Stroberg, S. R., Grahn, T., Pakarinen, J., Ball, G. C., Julin, R., Greenlees, P. T., Smallcombe, J., Andreoiu, C., Bernier, N., Bowry, M., Buckner, M., Caballero-Folch, R., ... Wu, C. Y. (2019). Isospin symmetry in B(E2) values: Coulomb excitation study of ²¹Mg. Physical Review C, 99(5), Article 051301. https://doi.org/10.1103/PhysRevC.99.051301

@article{e26398bbfa684fdb9f6e1586fda15052,

title = "Isospin symmetry in B(E2) values: Coulomb excitation study of 21Mg",

abstract = "The Tz = -3/2 nucleus 21Mg has been studied by Coulomb excitation on 196Pt and 110Pd targets. A 205.6(1)-keV γ-ray transition resulting from the Coulomb excitation of the 5/2+ ground state to the first excited 1/2+ state in 21Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 1/2+ state yield an adopted value of B(E2;5/2+→1/2+)=13.3(4) W.u. A new excited state at 1672(1) keV with tentative 92+ assignment was also identified in 21Mg. This work demonstrates a large difference in the B(E2;5/2+→1/2+) value between T=3/2, A=21 mirror nuclei. The difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern ab initio nuclear structure calculations, which have recently become applicable in the sd shell.",

author = "P. Ruotsalainen and J. Henderson and G. Hackman and G.H. Sargsyan and K.D. Launey and A. Saxena and P.C. Srivastava and S.R. Stroberg and T. Grahn and J. Pakarinen and G.C. Ball and R. Julin and P.T. Greenlees and J. Smallcombe and C. Andreoiu and N. Bernier and M. Bowry and M. Buckner and R. Caballero-Folch and A. Chester and S. Cruz and L.J. Evitts and R. Frederick and A.B. Garnsworthy and M. Holl and A. Kurkjian and D. Kisliuk and K.G. Leach and E. McGee and J. Measures and D. M{\"u}cher and J. Park and F. Sarazin and J.K. Smith and D. Southall and K. Starosta and C.E. Svensson and K. Whitmore and M. Williams and C.Y. Wu",

year = "2019",

month = may,

day = "6",

doi = "10.1103/PhysRevC.99.051301",

language = "English",

volume = "99",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

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Ruotsalainen, P, Henderson, J, Hackman, G, Sargsyan, GH, Launey, KD, Saxena, A, Srivastava, PC, Stroberg, SR, Grahn, T, Pakarinen, J, Ball, GC, Julin, R, Greenlees, PT, Smallcombe, J, Andreoiu, C, Bernier, N, Bowry, M, Buckner, M, Caballero-Folch, R, Chester, A, Cruz, S, Evitts, LJ, Frederick, R, Garnsworthy, AB, Holl, M, Kurkjian, A, Kisliuk, D, Leach, KG, McGee, E, Measures, J, Mücher, D, Park, J, Sarazin, F, Smith, JK, Southall, D, Starosta, K, Svensson, CE, Whitmore, K, Williams, M & Wu, CY 2019, 'Isospin symmetry in B(E2) values: Coulomb excitation study of ²¹Mg', Physical Review C, vol. 99, no. 5, 051301. https://doi.org/10.1103/PhysRevC.99.051301

TY - JOUR

T1 - Isospin symmetry in B(E2) values

T2 - Coulomb excitation study of 21Mg

AU - Ruotsalainen, P.

AU - Henderson, J.

AU - Hackman, G.

AU - Sargsyan, G.H.

AU - Launey, K.D.

AU - Saxena, A.

AU - Srivastava, P.C.

AU - Stroberg, S.R.

AU - Grahn, T.

AU - Pakarinen, J.

AU - Ball, G.C.

AU - Julin, R.

AU - Greenlees, P.T.

AU - Smallcombe, J.

AU - Andreoiu, C.

AU - Bernier, N.

AU - Bowry, M.

AU - Buckner, M.

AU - Caballero-Folch, R.

AU - Chester, A.

AU - Cruz, S.

AU - Evitts, L.J.

AU - Frederick, R.

AU - Garnsworthy, A.B.

AU - Holl, M.

AU - Kurkjian, A.

AU - Kisliuk, D.

AU - Leach, K.G.

AU - McGee, E.

AU - Measures, J.

AU - Mücher, D.

AU - Park, J.

AU - Sarazin, F.

AU - Smith, J.K.

AU - Southall, D.

AU - Starosta, K.

AU - Svensson, C.E.

AU - Whitmore, K.

AU - Williams, M.

AU - Wu, C.Y.

PY - 2019/5/6

Y1 - 2019/5/6

N2 - The Tz = -3/2 nucleus 21Mg has been studied by Coulomb excitation on 196Pt and 110Pd targets. A 205.6(1)-keV γ-ray transition resulting from the Coulomb excitation of the 5/2+ ground state to the first excited 1/2+ state in 21Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 1/2+ state yield an adopted value of B(E2;5/2+→1/2+)=13.3(4) W.u. A new excited state at 1672(1) keV with tentative 92+ assignment was also identified in 21Mg. This work demonstrates a large difference in the B(E2;5/2+→1/2+) value between T=3/2, A=21 mirror nuclei. The difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern ab initio nuclear structure calculations, which have recently become applicable in the sd shell.

AB - The Tz = -3/2 nucleus 21Mg has been studied by Coulomb excitation on 196Pt and 110Pd targets. A 205.6(1)-keV γ-ray transition resulting from the Coulomb excitation of the 5/2+ ground state to the first excited 1/2+ state in 21Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 1/2+ state yield an adopted value of B(E2;5/2+→1/2+)=13.3(4) W.u. A new excited state at 1672(1) keV with tentative 92+ assignment was also identified in 21Mg. This work demonstrates a large difference in the B(E2;5/2+→1/2+) value between T=3/2, A=21 mirror nuclei. The difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern ab initio nuclear structure calculations, which have recently become applicable in the sd shell.

U2 - 10.1103/PhysRevC.99.051301

DO - 10.1103/PhysRevC.99.051301

M3 - Article

SN - 2469-9985

VL - 99

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 051301

ER -

Isospin symmetry in B(E2) values: Coulomb excitation study of 21Mg

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Isospin symmetry in B(E2) values: Coulomb excitation study of ²¹Mg