B(E2) measurements in the yrast band of Mg 28: Implications for the N=20 island of inversion

M. S. Martin; H. Asch; G. C. Ball; P. E. Garrett; A. B. Garnsworthy; C. J. Griffin; G. Hackman; G. Hagen; K. D. Launey; G. Leckenby; J. Liang; R. S. Lubna; C. R. Natzke; C. Pearson; A. Redey; G. H. Sargsyan; P. C. Srivastava; K. Starosta; Z. H. Sun; C. E. Svensson; S. Upadhyayula; K. Van Wieren; V. Vedia; J. Williams; A. Woinoski; F. Wu; D. Yates; Z. Yu

doi:10.1103/PhysRevC.110.034314

B(E2) measurements in the yrast band of Mg 28: Implications for the N=20 island of inversion

M. S. Martin, H. Asch, G. C. Ball, P. E. Garrett, A. B. Garnsworthy, C. J. Griffin, G. Hackman, G. Hagen, K. D. Launey, G. Leckenby, J. Liang, R. S. Lubna, C. R. Natzke, C. Pearson, A. Redey, G. H. Sargsyan, P. C. Srivastava, K. Starosta, Z. H. Sun, C. E. SvenssonS. Upadhyayula, K. Van Wieren, V. Vedia, J. Williams, A. Woinoski, F. Wu, D. Yates, Z. Yu

Theoretical and Computational Physics

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

Abstract

High-precision lifetime measurements in Mg28 were performed to study neutron shell evolution in Mg isotopes and the onset of the N=20 island of inversion. Using both the recoil distance and Doppler shift attenuation methods, five lifetimes were measured in addition to six upper limits. The observation of two long-lived, negative-parity states demonstrate the importance of studying Mg isotopes for the contribution of intruder configurations to sd-shell nuclei. Lifetimes of the 21+ and 41+ states of 1.81(5) ps and 172(-10+11)stat.(4)stop.(8)feed.(4)targ.fs, respectively, demonstrate a loss of collectivity with increasing spin in the yrast band, permitting for distinguishing between current theoretical models. These measurements also highlight the progression of yrast structure across the Mg isotopic chain from rotational at N=12 to large shape mixing at N=16 and back to collective behavior at N=20 but with dominating intruder configurations.

Original language	English
Article number	034314
Journal	Physical Review C
Volume	110
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.110.034314
State	Published - Sep 2024

Funding

The authors appreciate the support of the ISAC Operations Group at TRIUMF and the Simon Fraser University Electronics and Machine Shops. This work was supported by the NSERC Discovery grant program. TRIUMF receives federal funding through a contribution agreement with the National Research Council of Canada. This work was also supported by the U.S. Department of Energy under Contract No. DE-FG02-93ER40789, the U.S Department of Energy, Office of Science, Office of Nuclear Physics, under Award No. DE-SC0023532, under the FRIB Theory Alliance Award No. DE-SC0013617, under SciDAC-5 (NUCLEI collaboration) Grant No. DE-FG02-97ER41014, and by the Quantum Science Center, a National Quantum Information Science Research Center of the U.S. Department of Energy. Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) programme. This research used resources from the Oak Ridge Leadership Computing Facility located at Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. P.C.S. acknowledges financial support from SERB (India), No. CRG/2022/005167.

Funders	Funder number
Quantum Science Center
National Quantum Information Science Research Center
Simon Fraser University
Natural Sciences and Engineering Research Council of Canada
TRIUMF
International Society for Advancement of Cytometry
Office of Science
National Research Council Canada
U.S. Department of Energy	DE-FG02-93ER40789
U.S. Department of Energy
Science and Engineering Research Board	CRG/2022/005167
Science and Engineering Research Board
Nuclear Physics	DE-FG02-97ER41014, DE-SC0013617, DE-SC0023532
Nuclear Physics
Oak Ridge National Laboratory	DE-AC05-00OR22725
Oak Ridge National Laboratory

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Martin, M. S., Asch, H., Ball, G. C., Garrett, P. E., Garnsworthy, A. B., Griffin, C. J., Hackman, G., Hagen, G., Launey, K. D., Leckenby, G., Liang, J., Lubna, R. S., Natzke, C. R., Pearson, C., Redey, A., Sargsyan, G. H., Srivastava, P. C., Starosta, K., Sun, Z. H., ... Yu, Z. (2024). B(E2) measurements in the yrast band of Mg 28: Implications for the N=20 island of inversion. Physical Review C, 110(3), Article 034314. https://doi.org/10.1103/PhysRevC.110.034314

@article{06e9fa3ce38140d7bfd55219475695be,

title = "B(E2) measurements in the yrast band of Mg 28: Implications for the N=20 island of inversion",

abstract = "High-precision lifetime measurements in Mg28 were performed to study neutron shell evolution in Mg isotopes and the onset of the N=20 island of inversion. Using both the recoil distance and Doppler shift attenuation methods, five lifetimes were measured in addition to six upper limits. The observation of two long-lived, negative-parity states demonstrate the importance of studying Mg isotopes for the contribution of intruder configurations to sd-shell nuclei. Lifetimes of the 21+ and 41+ states of 1.81(5) ps and 172(-10+11)stat.(4)stop.(8)feed.(4)targ.fs, respectively, demonstrate a loss of collectivity with increasing spin in the yrast band, permitting for distinguishing between current theoretical models. These measurements also highlight the progression of yrast structure across the Mg isotopic chain from rotational at N=12 to large shape mixing at N=16 and back to collective behavior at N=20 but with dominating intruder configurations.",

author = "Martin, {M. S.} and H. Asch and Ball, {G. C.} and Garrett, {P. E.} and Garnsworthy, {A. B.} and Griffin, {C. J.} and G. Hackman and G. Hagen and Launey, {K. D.} and G. Leckenby and J. Liang and Lubna, {R. S.} and Natzke, {C. R.} and C. Pearson and A. Redey and Sargsyan, {G. H.} and Srivastava, {P. C.} and K. Starosta and Sun, {Z. H.} and Svensson, {C. E.} and S. Upadhyayula and {Van Wieren}, K. and V. Vedia and J. Williams and A. Woinoski and F. Wu and D. Yates and Z. Yu",

note = "Publisher Copyright: {\textcopyright} 2024 American Physical Society.",

year = "2024",

month = sep,

doi = "10.1103/PhysRevC.110.034314",

language = "English",

volume = "110",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

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Martin, MS, Asch, H, Ball, GC, Garrett, PE, Garnsworthy, AB, Griffin, CJ, Hackman, G, Hagen, G, Launey, KD, Leckenby, G, Liang, J, Lubna, RS, Natzke, CR, Pearson, C, Redey, A, Sargsyan, GH, Srivastava, PC, Starosta, K, Sun, ZH, Svensson, CE, Upadhyayula, S, Van Wieren, K, Vedia, V, Williams, J, Woinoski, A, Wu, F, Yates, D & Yu, Z 2024, 'B(E2) measurements in the yrast band of Mg 28: Implications for the N=20 island of inversion', Physical Review C, vol. 110, no. 3, 034314. https://doi.org/10.1103/PhysRevC.110.034314

TY - JOUR

T1 - B(E2) measurements in the yrast band of Mg 28

T2 - Implications for the N=20 island of inversion

AU - Martin, M. S.

AU - Asch, H.

AU - Ball, G. C.

AU - Garrett, P. E.

AU - Garnsworthy, A. B.

AU - Griffin, C. J.

AU - Hackman, G.

AU - Hagen, G.

AU - Launey, K. D.

AU - Leckenby, G.

AU - Liang, J.

AU - Lubna, R. S.

AU - Natzke, C. R.

AU - Pearson, C.

AU - Redey, A.

AU - Sargsyan, G. H.

AU - Srivastava, P. C.

AU - Starosta, K.

AU - Sun, Z. H.

AU - Svensson, C. E.

AU - Upadhyayula, S.

AU - Van Wieren, K.

AU - Vedia, V.

AU - Williams, J.

AU - Woinoski, A.

AU - Wu, F.

AU - Yates, D.

AU - Yu, Z.

PY - 2024/9

Y1 - 2024/9

N2 - High-precision lifetime measurements in Mg28 were performed to study neutron shell evolution in Mg isotopes and the onset of the N=20 island of inversion. Using both the recoil distance and Doppler shift attenuation methods, five lifetimes were measured in addition to six upper limits. The observation of two long-lived, negative-parity states demonstrate the importance of studying Mg isotopes for the contribution of intruder configurations to sd-shell nuclei. Lifetimes of the 21+ and 41+ states of 1.81(5) ps and 172(-10+11)stat.(4)stop.(8)feed.(4)targ.fs, respectively, demonstrate a loss of collectivity with increasing spin in the yrast band, permitting for distinguishing between current theoretical models. These measurements also highlight the progression of yrast structure across the Mg isotopic chain from rotational at N=12 to large shape mixing at N=16 and back to collective behavior at N=20 but with dominating intruder configurations.

AB - High-precision lifetime measurements in Mg28 were performed to study neutron shell evolution in Mg isotopes and the onset of the N=20 island of inversion. Using both the recoil distance and Doppler shift attenuation methods, five lifetimes were measured in addition to six upper limits. The observation of two long-lived, negative-parity states demonstrate the importance of studying Mg isotopes for the contribution of intruder configurations to sd-shell nuclei. Lifetimes of the 21+ and 41+ states of 1.81(5) ps and 172(-10+11)stat.(4)stop.(8)feed.(4)targ.fs, respectively, demonstrate a loss of collectivity with increasing spin in the yrast band, permitting for distinguishing between current theoretical models. These measurements also highlight the progression of yrast structure across the Mg isotopic chain from rotational at N=12 to large shape mixing at N=16 and back to collective behavior at N=20 but with dominating intruder configurations.

UR - http://www.scopus.com/inward/record.url?scp=85204191947&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.110.034314

DO - 10.1103/PhysRevC.110.034314

M3 - Article

AN - SCOPUS:85204191947

SN - 2469-9985

VL - 110

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 034314

ER -

B(E2) measurements in the yrast band of Mg 28: Implications for the N=20 island of inversion

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