Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

W. S. Porter; B. Ashrafkhani; J. Bergmann; C. Brown; T. Brunner; J. D. Cardona; D. Curien; I. Dedes; T. Dickel; J. Dudek; E. Dunling; G. Gwinner; Z. Hockenbery; J. D. Holt; C. Hornung; C. Izzo; A. Jacobs; A. Javaji; B. Kootte; G. Kripkó-Koncz; E. M. Lykiardopoulou; T. Miyagi; I. Mukul; T. Murböck; W. R. Plaß; M. P. Reiter; J. Ringuette; C. Scheidenberger; R. Silwal; C. Walls; H. L. Wang; Y. Wang; J. Yang; J. Dilling; A. A. Kwiatkowski

doi:10.1103/PhysRevC.105.L041301

Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

W. S. Porter, B. Ashrafkhani, J. Bergmann, C. Brown, T. Brunner, J. D. Cardona, D. Curien, I. Dedes, T. Dickel, J. Dudek, E. Dunling, G. Gwinner, Z. Hockenbery, J. D. Holt, C. Hornung, C. Izzo, A. Jacobs, A. Javaji, B. Kootte, G. Kripkó-KonczE. M. Lykiardopoulou, T. Miyagi, I. Mukul, T. Murböck, W. R. Plaß, M. P. Reiter, J. Ringuette, C. Scheidenberger, R. Silwal, C. Walls, H. L. Wang, Y. Wang, J. Yang, J. Dilling, A. A. Kwiatkowski

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

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Abstract

Nuclear properties across the chart of nuclides are key to improving and validating our understanding of the strong interaction in nuclear physics. We present high-precision mass measurements of neutron-rich Fe isotopes performed at the TITAN facility. The multiple-reflection time-of-flight mass spectrometer (MR-ToF-MS), achieving a resolving power greater than 600000 for the first time, enabled the measurement of Fe63-70, including first-time high-precision direct measurements (δm/m≈10-7) of Fe68-70, as well as the discovery of a long-lived isomeric state in Fe69. These measurements are accompanied by both mean-field and ab initio calculations using the most recent realizations which enable theoretical assignment of the spin-parities of the Fe69 ground and isomeric states. Together with mean-field calculations of quadrupole deformation parameters for the Fe isotope chain, these results benchmark a maximum of deformation in the N=40 island of inversion in Fe and shed light on trends in level densities indicated in the newly refined mass surface.

Original language	English
Article number	L041301
Journal	Physical Review C
Volume	105
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.105.L041301
State	Published - Apr 2022
Externally published	Yes

Funding

The authors would like to thank S.R. Stroberg for the imsrg code used to perform VS-IMSRG calculations and J. Lassen and the laser ion source group at TRIUMF for their development of the Fe laser scheme. This work was supported by the Natural Sciences and Engineering Research Council (NSERC) of Canada under Grants No. SAPIN-2018-00027 and No. RGPAS-2018-522453, and by the National Research Council (NRC) of Canada through TRIUMF, the Polish National Science Centre under Contract No. 2016/21/B/ST2/01227, the Polish-French COPIN-IN2P3 collaboration agreement under project numbers 04-113 and 05-119 and COPIGAL 2020, the UKRI Science and Technology Facilities Council (STFC) Grant No. ST/P004008/1, the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Grant No. DE-FG02-93ER40789, and the German Research Foundation (DFG), Grant No. SCHE 1969/2-1, by the German Federal Ministry for Education and Research (BMBF), Grant No. 05P19RGFN1 and 05P21RGFN1, by the Hessian Ministry for Science and Art through the LOEWE Center HICforFAIR, by the JLU and GSI under the JLU-GSI strategic Helmholtz partnership agreement. Support from the National Natural Science Foundation of China, Grant No. 11975209, and the Physics Research and Development Program of Zhengzhou University, Grant No. 32410017 is acknowledged. Computations were performed with an allocation of computing resources on Cedar at WestGrid and Compute Canada, and on the Oak Cluster at TRIUMF managed by the University of British Columbia department of Advanced Research Computing (ARC).

Funders	Funder number
Hessian Ministry for Science and Art
Physics Research and Development Program of Zhengzhou University	32410017
U.S. Department of Energy
Office of Science
Nuclear Physics	DE-FG02-93ER40789
Nuclear Physics
TRIUMF
National Research Council
Natural Sciences and Engineering Research Council of Canada	RGPAS-2018-522453, SAPIN-2018-00027
Natural Sciences and Engineering Research Council of Canada
Science and Technology Facilities Council	ST/P004008/1
Science and Technology Facilities Council
Deutsche Forschungsgemeinschaft	SCHE 1969/2-1
Deutsche Forschungsgemeinschaft
National Natural Science Foundation of China	11975209
National Natural Science Foundation of China
Bundesministerium für Bildung und Forschung	05P21RGFN1, 05P19RGFN1
Bundesministerium für Bildung und Forschung
Jilin University
Narodowe Centrum Nauki	04-113, 2016/21/B/ST2/01227, 05-119
Narodowe Centrum Nauki
GSI Helmholtzzentrum für Schwerionenforschung

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Porter, W. S., Ashrafkhani, B., Bergmann, J., Brown, C., Brunner, T., Cardona, J. D., Curien, D., Dedes, I., Dickel, T., Dudek, J., Dunling, E., Gwinner, G., Hockenbery, Z., Holt, J. D., Hornung, C., Izzo, C., Jacobs, A., Javaji, A., Kootte, B., ... Kwiatkowski, A. A. (2022). Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes. Physical Review C, 105(4), Article L041301. https://doi.org/10.1103/PhysRevC.105.L041301

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title = "Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes",

abstract = "Nuclear properties across the chart of nuclides are key to improving and validating our understanding of the strong interaction in nuclear physics. We present high-precision mass measurements of neutron-rich Fe isotopes performed at the TITAN facility. The multiple-reflection time-of-flight mass spectrometer (MR-ToF-MS), achieving a resolving power greater than 600000 for the first time, enabled the measurement of Fe63-70, including first-time high-precision direct measurements (δm/m≈10-7) of Fe68-70, as well as the discovery of a long-lived isomeric state in Fe69. These measurements are accompanied by both mean-field and ab initio calculations using the most recent realizations which enable theoretical assignment of the spin-parities of the Fe69 ground and isomeric states. Together with mean-field calculations of quadrupole deformation parameters for the Fe isotope chain, these results benchmark a maximum of deformation in the N=40 island of inversion in Fe and shed light on trends in level densities indicated in the newly refined mass surface.",

author = "Porter, {W. S.} and B. Ashrafkhani and J. Bergmann and C. Brown and T. Brunner and Cardona, {J. D.} and D. Curien and I. Dedes and T. Dickel and J. Dudek and E. Dunling and G. Gwinner and Z. Hockenbery and Holt, {J. D.} and C. Hornung and C. Izzo and A. Jacobs and A. Javaji and B. Kootte and G. Kripk{\'o}-Koncz and Lykiardopoulou, {E. M.} and T. Miyagi and I. Mukul and T. Murb{\"o}ck and Pla{\ss}, {W. R.} and Reiter, {M. P.} and J. Ringuette and C. Scheidenberger and R. Silwal and C. Walls and Wang, {H. L.} and Y. Wang and J. Yang and J. Dilling and Kwiatkowski, {A. A.}",

note = "Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

year = "2022",

month = apr,

doi = "10.1103/PhysRevC.105.L041301",

language = "English",

volume = "105",

journal = "Physical Review C",

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Porter, WS, Ashrafkhani, B, Bergmann, J, Brown, C, Brunner, T, Cardona, JD, Curien, D, Dedes, I, Dickel, T, Dudek, J, Dunling, E, Gwinner, G, Hockenbery, Z, Holt, JD, Hornung, C, Izzo, C, Jacobs, A, Javaji, A, Kootte, B, Kripkó-Koncz, G, Lykiardopoulou, EM, Miyagi, T, Mukul, I, Murböck, T, Plaß, WR, Reiter, MP, Ringuette, J, Scheidenberger, C, Silwal, R, Walls, C, Wang, HL, Wang, Y, Yang, J, Dilling, J & Kwiatkowski, AA 2022, 'Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes', Physical Review C, vol. 105, no. 4, L041301. https://doi.org/10.1103/PhysRevC.105.L041301

TY - JOUR

T1 - Mapping the N=40 island of inversion

T2 - Precision mass measurements of neutron-rich Fe isotopes

AU - Porter, W. S.

AU - Ashrafkhani, B.

AU - Bergmann, J.

AU - Brown, C.

AU - Brunner, T.

AU - Cardona, J. D.

AU - Curien, D.

AU - Dedes, I.

AU - Dickel, T.

AU - Dudek, J.

AU - Dunling, E.

AU - Gwinner, G.

AU - Hockenbery, Z.

AU - Holt, J. D.

AU - Hornung, C.

AU - Izzo, C.

AU - Jacobs, A.

AU - Javaji, A.

AU - Kootte, B.

AU - Kripkó-Koncz, G.

AU - Lykiardopoulou, E. M.

AU - Miyagi, T.

AU - Mukul, I.

AU - Murböck, T.

AU - Plaß, W. R.

AU - Reiter, M. P.

AU - Ringuette, J.

AU - Scheidenberger, C.

AU - Silwal, R.

AU - Walls, C.

AU - Wang, H. L.

AU - Wang, Y.

AU - Yang, J.

AU - Dilling, J.

AU - Kwiatkowski, A. A.

PY - 2022/4

Y1 - 2022/4

N2 - Nuclear properties across the chart of nuclides are key to improving and validating our understanding of the strong interaction in nuclear physics. We present high-precision mass measurements of neutron-rich Fe isotopes performed at the TITAN facility. The multiple-reflection time-of-flight mass spectrometer (MR-ToF-MS), achieving a resolving power greater than 600000 for the first time, enabled the measurement of Fe63-70, including first-time high-precision direct measurements (δm/m≈10-7) of Fe68-70, as well as the discovery of a long-lived isomeric state in Fe69. These measurements are accompanied by both mean-field and ab initio calculations using the most recent realizations which enable theoretical assignment of the spin-parities of the Fe69 ground and isomeric states. Together with mean-field calculations of quadrupole deformation parameters for the Fe isotope chain, these results benchmark a maximum of deformation in the N=40 island of inversion in Fe and shed light on trends in level densities indicated in the newly refined mass surface.

AB - Nuclear properties across the chart of nuclides are key to improving and validating our understanding of the strong interaction in nuclear physics. We present high-precision mass measurements of neutron-rich Fe isotopes performed at the TITAN facility. The multiple-reflection time-of-flight mass spectrometer (MR-ToF-MS), achieving a resolving power greater than 600000 for the first time, enabled the measurement of Fe63-70, including first-time high-precision direct measurements (δm/m≈10-7) of Fe68-70, as well as the discovery of a long-lived isomeric state in Fe69. These measurements are accompanied by both mean-field and ab initio calculations using the most recent realizations which enable theoretical assignment of the spin-parities of the Fe69 ground and isomeric states. Together with mean-field calculations of quadrupole deformation parameters for the Fe isotope chain, these results benchmark a maximum of deformation in the N=40 island of inversion in Fe and shed light on trends in level densities indicated in the newly refined mass surface.

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U2 - 10.1103/PhysRevC.105.L041301

DO - 10.1103/PhysRevC.105.L041301

M3 - Article

AN - SCOPUS:85128942589

SN - 2469-9985

VL - 105

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - L041301

ER -

Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

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