Shape coexistence and mixing of low-lying 0+ states in 96Sr

S. Cruz; P. C. Bender; R. Krücken; K. Wimmer; F. Ames; C. Andreoiu; R. A.E. Austin; C. S. Bancroft; R. Braid; T. Bruhn; W. N. Catford; A. Cheeseman; A. Chester; D. S. Cross; C. Aa Diget; T. Drake; A. B. Garnsworthy; G. Hackman; R. Kanungo; A. Knapton; W. Korten; K. Kuhn; J. Lassen; R. Laxdal; M. Marchetto; A. Matta; D. Miller; M. Moukaddam; N. A. Orr; N. Sachmpazidi; A. Sanetullaev; C. E. Svensson; N. Terpstra; C. Unsworth; P. J. Voss

doi:10.1016/j.physletb.2018.09.031

Shape coexistence and mixing of low-lying 0⁺ states in ⁹⁶Sr

S. Cruz, P. C. Bender, R. Krücken, K. Wimmer^*, F. Ames, C. Andreoiu, R. A.E. Austin, C. S. Bancroft, R. Braid, T. Bruhn, W. N. Catford, A. Cheeseman, A. Chester, D. S. Cross, C. Aa Diget, T. Drake, A. B. Garnsworthy, G. Hackman, R. Kanungo, A. KnaptonW. Korten, K. Kuhn, J. Lassen, R. Laxdal, M. Marchetto, A. Matta, D. Miller, M. Moukaddam, N. A. Orr, N. Sachmpazidi, A. Sanetullaev, C. E. Svensson, N. Terpstra, C. Unsworth, P. J. Voss

^*Corresponding author for this work

Physics

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

Abstract

The low energy excited 0_2,3 ⁺ states in ⁹⁶Sr are amongst the most prominent examples of shape coexistence across the nuclear landscape. In this work, the neutron [2s_1/2]² content of the 0_1,2,3 ⁺ states in ⁹⁶Sr was determined by means of the d(⁹⁵Sr, p) transfer reaction at the TRIUMF-ISAC2 facility using the SHARC and TIGRESS arrays. Spectroscopic factors of 0.19(3) and 0.22(3) were extracted for the ⁹⁶Sr ground and 1229 keV 0⁺ states, respectively, by fitting the experimental angular distributions to DWBA reaction model calculations. A detailed analysis of the γ-decay of the isomeric 0₃ ⁺ state was used to determine a spectroscopic factor of 0.33(13). The experimental results are compared to shell model calculations, which predict negligible spectroscopic strength for the excited 0⁺ states in ⁹⁶Sr. The strengths of the excited 0_2,3 ⁺ states were also analyzed within a two-level mixing model and are consistent with a mixing strength of a²=0.40(14) and a difference in intrinsic deformations of |Δβ|=0.31(3). These results suggest coexistence of three different configurations in ⁹⁶Sr and strong shape mixing of the two excited 0⁺ states.

Original language	English
Pages (from-to)	94-99
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	786
DOIs	https://doi.org/10.1016/j.physletb.2018.09.031
Publication status	Published - 10 Nov 2018

Bibliographical note

Keywords

Shape coexistence
Single-particle structure
Transfer reaction

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10.1016/j.physletb.2018.09.031

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Cite this

Cruz, S., Bender, P. C., Krücken, R., Wimmer, K., Ames, F., Andreoiu, C., Austin, R. A. E., Bancroft, C. S., Braid, R., Bruhn, T., Catford, W. N., Cheeseman, A., Chester, A., Cross, D. S., Diget, C. A., Drake, T., Garnsworthy, A. B., Hackman, G., Kanungo, R., ... Voss, P. J. (2018). Shape coexistence and mixing of low-lying 0⁺ states in ⁹⁶Sr. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 786, 94-99. https://doi.org/10.1016/j.physletb.2018.09.031

@article{1c507c740f7a4f95be1f9e0b0eef0e9c,

title = "Shape coexistence and mixing of low-lying 0+ states in 96Sr",

abstract = "The low energy excited 02,3 + states in 96Sr are amongst the most prominent examples of shape coexistence across the nuclear landscape. In this work, the neutron [2s1/2]2 content of the 01,2,3 + states in 96Sr was determined by means of the d(95Sr, p) transfer reaction at the TRIUMF-ISAC2 facility using the SHARC and TIGRESS arrays. Spectroscopic factors of 0.19(3) and 0.22(3) were extracted for the 96Sr ground and 1229 keV 0+ states, respectively, by fitting the experimental angular distributions to DWBA reaction model calculations. A detailed analysis of the γ-decay of the isomeric 03 + state was used to determine a spectroscopic factor of 0.33(13). The experimental results are compared to shell model calculations, which predict negligible spectroscopic strength for the excited 0+ states in 96Sr. The strengths of the excited 02,3 + states were also analyzed within a two-level mixing model and are consistent with a mixing strength of a2=0.40(14) and a difference in intrinsic deformations of |Δβ|=0.31(3). These results suggest coexistence of three different configurations in 96Sr and strong shape mixing of the two excited 0+ states.",

keywords = "Shape coexistence, Single-particle structure, Transfer reaction",

author = "S. Cruz and Bender, {P. C.} and R. Kr{\"u}cken and K. Wimmer and F. Ames and C. Andreoiu and Austin, {R. A.E.} and Bancroft, {C. S.} and R. Braid and T. Bruhn and Catford, {W. N.} and A. Cheeseman and A. Chester and Cross, {D. S.} and Diget, {C. Aa} and T. Drake and Garnsworthy, {A. B.} and G. Hackman and R. Kanungo and A. Knapton and W. Korten and K. Kuhn and J. Lassen and R. Laxdal and M. Marchetto and A. Matta and D. Miller and M. Moukaddam and Orr, {N. A.} and N. Sachmpazidi and A. Sanetullaev and Svensson, {C. E.} and N. Terpstra and C. Unsworth and Voss, {P. J.}",

note = "{\textcopyright} 2018 The Author(s).",

year = "2018",

month = nov,

day = "10",

doi = "10.1016/j.physletb.2018.09.031",

language = "English",

volume = "786",

pages = "94--99",

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

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Cruz, S, Bender, PC, Krücken, R, Wimmer, K, Ames, F, Andreoiu, C, Austin, RAE, Bancroft, CS, Braid, R, Bruhn, T, Catford, WN, Cheeseman, A, Chester, A, Cross, DS, Diget, CA, Drake, T, Garnsworthy, AB, Hackman, G, Kanungo, R, Knapton, A, Korten, W, Kuhn, K, Lassen, J, Laxdal, R, Marchetto, M, Matta, A, Miller, D, Moukaddam, M, Orr, NA, Sachmpazidi, N, Sanetullaev, A, Svensson, CE, Terpstra, N, Unsworth, C & Voss, PJ 2018, 'Shape coexistence and mixing of low-lying 0⁺ states in ⁹⁶Sr', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 786, pp. 94-99. https://doi.org/10.1016/j.physletb.2018.09.031

TY - JOUR

T1 - Shape coexistence and mixing of low-lying 0+ states in 96Sr

AU - Cruz, S.

AU - Bender, P. C.

AU - Krücken, R.

AU - Wimmer, K.

AU - Ames, F.

AU - Andreoiu, C.

AU - Austin, R. A.E.

AU - Bancroft, C. S.

AU - Braid, R.

AU - Bruhn, T.

AU - Catford, W. N.

AU - Cheeseman, A.

AU - Chester, A.

AU - Cross, D. S.

AU - Diget, C. Aa

AU - Drake, T.

AU - Garnsworthy, A. B.

AU - Hackman, G.

AU - Kanungo, R.

AU - Knapton, A.

AU - Korten, W.

AU - Kuhn, K.

AU - Lassen, J.

AU - Laxdal, R.

AU - Marchetto, M.

AU - Matta, A.

AU - Miller, D.

AU - Moukaddam, M.

AU - Orr, N. A.

AU - Sachmpazidi, N.

AU - Sanetullaev, A.

AU - Svensson, C. E.

AU - Terpstra, N.

AU - Unsworth, C.

AU - Voss, P. J.

PY - 2018/11/10

Y1 - 2018/11/10

N2 - The low energy excited 02,3 + states in 96Sr are amongst the most prominent examples of shape coexistence across the nuclear landscape. In this work, the neutron [2s1/2]2 content of the 01,2,3 + states in 96Sr was determined by means of the d(95Sr, p) transfer reaction at the TRIUMF-ISAC2 facility using the SHARC and TIGRESS arrays. Spectroscopic factors of 0.19(3) and 0.22(3) were extracted for the 96Sr ground and 1229 keV 0+ states, respectively, by fitting the experimental angular distributions to DWBA reaction model calculations. A detailed analysis of the γ-decay of the isomeric 03 + state was used to determine a spectroscopic factor of 0.33(13). The experimental results are compared to shell model calculations, which predict negligible spectroscopic strength for the excited 0+ states in 96Sr. The strengths of the excited 02,3 + states were also analyzed within a two-level mixing model and are consistent with a mixing strength of a2=0.40(14) and a difference in intrinsic deformations of |Δβ|=0.31(3). These results suggest coexistence of three different configurations in 96Sr and strong shape mixing of the two excited 0+ states.

AB - The low energy excited 02,3 + states in 96Sr are amongst the most prominent examples of shape coexistence across the nuclear landscape. In this work, the neutron [2s1/2]2 content of the 01,2,3 + states in 96Sr was determined by means of the d(95Sr, p) transfer reaction at the TRIUMF-ISAC2 facility using the SHARC and TIGRESS arrays. Spectroscopic factors of 0.19(3) and 0.22(3) were extracted for the 96Sr ground and 1229 keV 0+ states, respectively, by fitting the experimental angular distributions to DWBA reaction model calculations. A detailed analysis of the γ-decay of the isomeric 03 + state was used to determine a spectroscopic factor of 0.33(13). The experimental results are compared to shell model calculations, which predict negligible spectroscopic strength for the excited 0+ states in 96Sr. The strengths of the excited 02,3 + states were also analyzed within a two-level mixing model and are consistent with a mixing strength of a2=0.40(14) and a difference in intrinsic deformations of |Δβ|=0.31(3). These results suggest coexistence of three different configurations in 96Sr and strong shape mixing of the two excited 0+ states.

KW - Shape coexistence

KW - Single-particle structure

KW - Transfer reaction

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U2 - 10.1016/j.physletb.2018.09.031

DO - 10.1016/j.physletb.2018.09.031

M3 - Article

AN - SCOPUS:85053788357

SN - 0370-2693

VL - 786

SP - 94

EP - 99

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

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

ER -