Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes

R. Silwal; C. Andreoiu; B. Ashrafkhani; J. Bergmann; T. Brunner; J. Cardona; K. Dietrich; E. Dunling; G. Gwinner; Z. Hockenbery; J. D. Holt; C. Izzo; A. Jacobs; A. Javaji; B. Kootte; Y. Lan; D. Lunney; E. M. Lykiardopoulou; T. Miyagi; M. Mougeot; I. Mukul; T. Murböck; W. S. Porter; M. Reiter; J. Ringuette; J. Dilling; A. A. Kwiatkowski

doi:10.1016/j.physletb.2022.137288

Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes

R. Silwal, C. Andreoiu, B. Ashrafkhani, J. Bergmann, T. Brunner, J. Cardona, K. Dietrich, E. Dunling, G. Gwinner, Z. Hockenbery, J. D. Holt, C. Izzo, A. Jacobs, A. Javaji, B. Kootte, Y. Lan, D. Lunney, E. M. Lykiardopoulou, T. Miyagi, M. MougeotI. Mukul, T. Murböck, W. S. Porter, M. Reiter, J. Ringuette, J. Dilling, A. A. Kwiatkowski

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7 Scopus citations

Abstract

Mass measurements continue to provide invaluable information for elucidating nuclear structure and scenarios of astrophysical interest. The transition region between the Z=20 and 28 proton shell closures is particularly interesting due to the onset and evolution of nuclear deformation as nuclei become more neutron-rich. This provides a critical testing ground for emerging ab-initio nuclear structure models. Here, we present high-precision mass measurements of neutron-rich chromium isotopes using the sensitive electrostatic Multiple-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS) at TRIUMF's Ion Trap for Atomic and Nuclear Science (TITAN) facility. Our high-precision mass measurements of ^59,61−63Cr confirm previous results, and the improved precision in measurements of ⁶⁴⁻⁶⁵Cr refine the mass surface beyond N=40. With the ab initio in-medium similarity renormalization group, we examine the trends in collectivity in chromium isotopes and give a complete picture of the N=40 island of inversion from calcium to nickel.

Original language	English
Article number	137288
Journal	Physics Letters B
Volume	833
DOIs	https://doi.org/10.1016/j.physletb.2022.137288
State	Published - Oct 10 2022
Externally published	Yes

Funding

The authors would like to thank M. Good for his continual support, J. Lassen and the TRILIS group for their help with setting up the Cr lasers scheme for signal optimization, and S. R. Stroberg for the imsrg++ code [65] used to perform these calculations. The shell-model diagonalization of VS-IMSRG calculations were done with the KSHELL code [66] . This work was supported by the Natural Sciences and Engineering Research Council ( NSERC ) of Canada under grants SAPIN-2018-00027 and RGPAS-2018-522453 , by the National Research Council ( NRC ) of Canada through TRIUMF, by the UK Science and Technology Facilities Council STFC Grant No: ST/V001051/1 , and by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project-ID 279384907 – SFB 1245. 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). We also thank K. Sieja for providing the LNPS' results. The authors would like to thank M. Good for his continual support, J. Lassen and the TRILIS group for their help with setting up the Cr lasers scheme for signal optimization, and S. R. Stroberg for the imsrg++ code [65] used to perform these calculations. The shell-model diagonalization of VS-IMSRG calculations were done with the KSHELL code [66]. This work was supported by the Natural Sciences and Engineering Research Council (NSERC) of Canada under grants SAPIN-2018-00027 and RGPAS-2018-522453, by the National Research Council (NRC) of Canada through TRIUMF, by the UK Science and Technology Facilities Council STFC Grant No: ST/V001051/1, and by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project-ID 279384907 – SFB 1245. 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). We also thank K. Sieja for providing the LNPS' results.

Funders	Funder number
University of British Columbia department of Advanced Research Computing
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
National Research Council Canada
Science and Technology Facilities Council	ST/V001051/1
Science and Technology Facilities Council
Australian Research Council
Deutsche Forschungsgemeinschaft	279384907 – SFB 1245
Deutsche Forschungsgemeinschaft

Keywords

Intruder configuration
Island of inversion
Mass measurement
MR-TOF-MS
Nuclear structure
Two neutron separation energies

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10.1016/j.physletb.2022.137288

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Silwal, R., Andreoiu, C., Ashrafkhani, B., Bergmann, J., Brunner, T., Cardona, J., Dietrich, K., Dunling, E., Gwinner, G., Hockenbery, Z., Holt, J. D., Izzo, C., Jacobs, A., Javaji, A., Kootte, B., Lan, Y., Lunney, D., Lykiardopoulou, E. M., Miyagi, T., ... Kwiatkowski, A. A. (2022). Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes. Physics Letters B, 833, Article 137288. https://doi.org/10.1016/j.physletb.2022.137288

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title = "Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes",

abstract = "Mass measurements continue to provide invaluable information for elucidating nuclear structure and scenarios of astrophysical interest. The transition region between the Z=20 and 28 proton shell closures is particularly interesting due to the onset and evolution of nuclear deformation as nuclei become more neutron-rich. This provides a critical testing ground for emerging ab-initio nuclear structure models. Here, we present high-precision mass measurements of neutron-rich chromium isotopes using the sensitive electrostatic Multiple-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS) at TRIUMF's Ion Trap for Atomic and Nuclear Science (TITAN) facility. Our high-precision mass measurements of 59,61−63Cr confirm previous results, and the improved precision in measurements of 64−65Cr refine the mass surface beyond N=40. With the ab initio in-medium similarity renormalization group, we examine the trends in collectivity in chromium isotopes and give a complete picture of the N=40 island of inversion from calcium to nickel.",

keywords = "Intruder configuration, Island of inversion, Mass measurement, MR-TOF-MS, Nuclear structure, Two neutron separation energies",

author = "R. Silwal and C. Andreoiu and B. Ashrafkhani and J. Bergmann and T. Brunner and J. Cardona and K. Dietrich and E. Dunling and G. Gwinner and Z. Hockenbery and Holt, {J. D.} and C. Izzo and A. Jacobs and A. Javaji and B. Kootte and Y. Lan and D. Lunney and Lykiardopoulou, {E. M.} and T. Miyagi and M. Mougeot and I. Mukul and T. Murb{\"o}ck and Porter, {W. S.} and M. Reiter and J. Ringuette and J. Dilling and Kwiatkowski, {A. A.}",

note = "Publisher Copyright: {\textcopyright} 2022 The Author(s)",

year = "2022",

month = oct,

day = "10",

doi = "10.1016/j.physletb.2022.137288",

language = "English",

volume = "833",

journal = "Physics Letters B",

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Silwal, R, Andreoiu, C, Ashrafkhani, B, Bergmann, J, Brunner, T, Cardona, J, Dietrich, K, Dunling, E, Gwinner, G, Hockenbery, Z, Holt, JD, Izzo, C, Jacobs, A, Javaji, A, Kootte, B, Lan, Y, Lunney, D, Lykiardopoulou, EM, Miyagi, T, Mougeot, M, Mukul, I, Murböck, T, Porter, WS, Reiter, M, Ringuette, J, Dilling, J & Kwiatkowski, AA 2022, 'Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes', Physics Letters B, vol. 833, 137288. https://doi.org/10.1016/j.physletb.2022.137288

TY - JOUR

T1 - Summit of the N=40 island of inversion

T2 - Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes

AU - Silwal, R.

AU - Andreoiu, C.

AU - Ashrafkhani, B.

AU - Bergmann, J.

AU - Brunner, T.

AU - Cardona, J.

AU - Dietrich, K.

AU - Dunling, E.

AU - Gwinner, G.

AU - Hockenbery, Z.

AU - Holt, J. D.

AU - Izzo, C.

AU - Jacobs, A.

AU - Javaji, A.

AU - Kootte, B.

AU - Lan, Y.

AU - Lunney, D.

AU - Lykiardopoulou, E. M.

AU - Miyagi, T.

AU - Mougeot, M.

AU - Mukul, I.

AU - Murböck, T.

AU - Porter, W. S.

AU - Reiter, M.

AU - Ringuette, J.

AU - Dilling, J.

AU - Kwiatkowski, A. A.

PY - 2022/10/10

Y1 - 2022/10/10

N2 - Mass measurements continue to provide invaluable information for elucidating nuclear structure and scenarios of astrophysical interest. The transition region between the Z=20 and 28 proton shell closures is particularly interesting due to the onset and evolution of nuclear deformation as nuclei become more neutron-rich. This provides a critical testing ground for emerging ab-initio nuclear structure models. Here, we present high-precision mass measurements of neutron-rich chromium isotopes using the sensitive electrostatic Multiple-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS) at TRIUMF's Ion Trap for Atomic and Nuclear Science (TITAN) facility. Our high-precision mass measurements of 59,61−63Cr confirm previous results, and the improved precision in measurements of 64−65Cr refine the mass surface beyond N=40. With the ab initio in-medium similarity renormalization group, we examine the trends in collectivity in chromium isotopes and give a complete picture of the N=40 island of inversion from calcium to nickel.

AB - Mass measurements continue to provide invaluable information for elucidating nuclear structure and scenarios of astrophysical interest. The transition region between the Z=20 and 28 proton shell closures is particularly interesting due to the onset and evolution of nuclear deformation as nuclei become more neutron-rich. This provides a critical testing ground for emerging ab-initio nuclear structure models. Here, we present high-precision mass measurements of neutron-rich chromium isotopes using the sensitive electrostatic Multiple-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS) at TRIUMF's Ion Trap for Atomic and Nuclear Science (TITAN) facility. Our high-precision mass measurements of 59,61−63Cr confirm previous results, and the improved precision in measurements of 64−65Cr refine the mass surface beyond N=40. With the ab initio in-medium similarity renormalization group, we examine the trends in collectivity in chromium isotopes and give a complete picture of the N=40 island of inversion from calcium to nickel.

KW - Intruder configuration

KW - Island of inversion

KW - Mass measurement

KW - MR-TOF-MS

KW - Nuclear structure

KW - Two neutron separation energies

UR - http://www.scopus.com/inward/record.url?scp=85134780283&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2022.137288

DO - 10.1016/j.physletb.2022.137288

M3 - Article

AN - SCOPUS:85134780283

SN - 0370-2693

VL - 833

JO - Physics Letters B

JF - Physics Letters B

M1 - 137288

ER -

Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes

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Keywords

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