Multistep Coulomb excitation of Ni64: Shape coexistence and nature of low-spin excitations

Little, D.; Ayangeakaa, A. D.; Janssens, R. V. F.; Zhu, S.; Tsunoda, Y.; Otsuka, T.; Brown, B. A.; Carpenter, M. P.; Gade, A.; Rhodes, D.; Hoffman, C. R.; Kondev, F. G.; Lauritsen, T.; Seweryniak, D.; Wu, J.; Henderson, J.; Wu, C. Y.; Chowdhury, P.; Bender, P. C.; Forney, A. M.; Walters, W. B.

doi:10.1103/physrevc.106.044313

Title: Multistep Coulomb excitation of Ni 64 : Shape coexistence and nature of low-spin excitations

Journal Article · Fri Oct 14 00:00:00 EDT 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.106.044313· OSTI ID:1892378

Little, D. ^[1];

^[1];

^[1]; Zhu, S. ^[2];

^[3]; Otsuka, T. ^[4]; Brown, B. A. ^[5];

^[6]; Gade, A. ^[5]; Rhodes, D. ^[7]; Hoffman, C. R. ^[6];

^[6]; Lauritsen, T. ^[6]; Seweryniak, D. ^[6]; Wu, J. ^[6]; Henderson, J. ^[8];

^[8]; Chowdhury, P. ^[9];

^[9];

^[10] more »

Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Tsukuba, Ibaraki (Japan); Univ. of Tokyo (Japan)
Univ. of Tokyo (Japan); RIKEN Nishina Center, Saitama (Japan); KU Leuven (Belgium)
Michigan State Univ., East Lansing, MI (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Michigan State Univ., East Lansing, MI (United States); TRIUMF, Vancouver, BC (Canada)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Massachusetts, Lowell, MA (United States)
Univ. of Maryland, College Park, MD (United States); Georgia Tech Research Inst., Atlanta, GA (United States)
Univ. of Maryland, College Park, MD (United States)

The structure of ⁶⁴Ni, the heaviest stable Ni isotope, has been investigated via high-statistics, multistep safe Coulomb excitation to search for shape coexistence, a phenomenon recently observed in neutron-rich ⁶⁶Ni and ⁷⁰Ni as well as in doubly magic, N = 40, ⁶⁸Ni. The study was motivated by recent, state-of-the-art Monte Carlo shell-model calculations (MCSM), where a Hamiltonian with effective interactions incorporating the monopole tensor force predicts the existence of shape coexistence, also in the lower-mass ^62,64Ni isotopes. A set of transition and static E2 matrix elements for both yrast and near-yrast structures was extracted from the differential Coulomb excitation cross sections. From comparisons between the new results and MCSM as well as other shell-model calculations, a clearer picture of the structure of ⁶⁴Ni emerges. Specifically, the low-spin states are shown to be dominated by proton and neutron excitations mainly within the fp shell, with minimal contribution from the g_9/2 shape-driving neutron orbital. The agreement between experimental data and MCSM results indicates a small oblate deformation for the $$0$$$^{+}_{2}$$ level and a spherical shape for the $$0$$$^{+}_{3}$$ state. In addition, the small upper limit determined for the B(E2) probability of a transition associated with the decay of the recently observed 3463-keV, $$0$$$^{+}_{4}$$ state agrees with its proposed assignment to a prolate shape, herewith providing first evidence for triple shape coexistence in a stable Ni isotope.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: Michigan State Univ., East Lansing, MI (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); University of North Carolina, Chapel Hill, NC (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan

Grant/Contract Number:: SC0020451; PHY-1565546; FG02-97ER41041; FG02-94ER4084; AC02-05CH11231; AC02-06CH11357; FG02-97ER41033; FG02-08ER41556; FG02-94ER40848; AC52-07NA27344

OSTI ID:: 1892378

Alternate ID(s):: OSTI ID: 1893589; OSTI ID: 1895050; OSTI ID: 1908106

Report Number(s):: LLNL-JRNL-835854; TRN: US2310181

Journal Information:: Physical Review. C, Vol. 106, Issue 4; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

References (48)

Search for shape-coexisting $0^{+}$ states in ${}^{66}{Ni}$ from lifetime measurements Olaizola, B.; Fraile, L. M.; Mach, H. Physical Review C, Vol. 95, Issue 6 https://doi.org/10.1103/PhysRevC.95.061303	journal	June 2017
Erratum: Analogous intruder behavior near Ni, Sn, and Pb isotopes [Phys. Rev. C 92 , 024319 (2015)] Liddick, S. N.; Walters, W. B.; Chiara, C. J. Physical Review C, Vol. 94, Issue 6 https://doi.org/10.1103/PhysRevC.94.069904	journal	December 2016
Role of the $ν g_{9 / 2}$ orbital in the development of collectivity in the $A \approx 60$ region: The case of ${}^{61}{Co}$ Ayangeakaa, A. D.; Zhu, S.; Janssens, R. V. F. Physical Review C, Vol. 91, Issue 4 https://doi.org/10.1103/PhysRevC.91.044327	journal	April 2015
Nuclear Data Sheets for A=64 Singh, Balraj; Chen, Jun Nuclear Data Sheets, Vol. 178 https://doi.org/10.1016/j.nds.2021.11.002	journal	December 2021
Analogous intruder behavior near Ni, Sn, and Pb isotopes Liddick, S. N.; Walters, W. B.; Chiara, C. J. Physical Review C, Vol. 92, Issue 2 https://doi.org/10.1103/PhysRevC.92.024319	journal	August 2015
Spectroscopic study of the $^{64, 66, 68}$ Ni isotopes populated in $^{64}$ Ni + $^{238}$ U collisions Broda, R.; Pawłat, T.; Królas, W. Physical Review C, Vol. 86, Issue 6 https://doi.org/10.1103/PhysRevC.86.064312	journal	December 2012
Level structure of the neutron-rich ${}^{56, 58, 60}{Cr}$ isotopes: Single-particle and collective aspects Zhu, S.; Deacon, A. N.; Freeman, S. J. Physical Review C, Vol. 74, Issue 6 https://doi.org/10.1103/PhysRevC.74.064315	journal	December 2006
Extension of the $N = 40$ Island of Inversion towards $N = 50$ : Spectroscopy of ${}^{66}{Cr}$ , ${}^{70, 72}{Fe}$ Santamaria, C.; Louchart, C.; Obertelli, A. Physical Review Letters, Vol. 115, Issue 19 https://doi.org/10.1103/PhysRevLett.115.192501	journal	November 2015
Single-particle and collective excitations in $^{63}$ Ni Albers, M.; Zhu, S.; Janssens, R. V. F. Physical Review C, Vol. 88, Issue 5 https://doi.org/10.1103/PhysRevC.88.054314	journal	November 2013
Yrast structure of ${}^{64}{Fe}$ Hoteling, N.; Walters, W. B.; Janssens, R. V. F. Physical Review C, Vol. 74, Issue 6 https://doi.org/10.1103/PhysRevC.74.064313	journal	December 2006
In-beam $γ$ -ray spectroscopy of ${}^{62, 64}{Cr}$ Gade, A.; Janssens, R. V. F.; Bazin, D. Physical Review C, Vol. 103, Issue 1 https://doi.org/10.1103/PhysRevC.103.014314	journal	January 2021
Shape Coexistence at Zero Spin in ${}^{64}{Ni}$ Driven by the Monopole Tensor Interaction Mărginean, N.; Little, D.; Tsunoda, Y. Physical Review Letters, Vol. 125, Issue 10 https://doi.org/10.1103/PhysRevLett.125.102502	journal	September 2020
Single-particle and collective excitations in ${}^{62}{Ni}$ Albers, M.; Zhu, S.; Ayangeakaa, A. D. Physical Review C, Vol. 94, Issue 3 https://doi.org/10.1103/PhysRevC.94.034301	journal	September 2016
The role of shell evolution in shape coexistence Otsuka, T.; Tsunoda, Y. Journal of Physics G: Nuclear and Particle Physics, Vol. 43, Issue 2 https://doi.org/10.1088/0954-3899/43/2/024009	journal	January 2016
Proton spectroscopy of ${}^{48}{Ni}, {}^{46}{Fe}$ , and ${}^{44}{Cr}$ Pomorski, M.; Pfützner, M.; Dominik, W. Physical Review C, Vol. 90, Issue 1 https://doi.org/10.1103/PhysRevC.90.014311	journal	July 2014
In-beam γ-ray spectroscopy and inclusive two-proton knockout cross section measurements at $N \approx 40$ Adrich, P.; Amthor, A. M.; Bazin, D. Physical Review C, Vol. 77, Issue 5 https://doi.org/10.1103/PhysRevC.77.054306	journal	May 2008
Monte Carlo shell model for atomic nuclei Otsuka, T.; Honma, M.; Mizusaki, T. Progress in Particle and Nuclear Physics, Vol. 47, Issue 1 https://doi.org/10.1016/S0146-6410(01)00157-0	journal	January 2001
Low-lying excitations in ${}^{72}{Ni}$ Morales, A. I.; Benzoni, G.; Watanabe, H. Physical Review C, Vol. 93, Issue 3 https://doi.org/10.1103/PhysRevC.93.034328	journal	March 2016
Evolution of Nuclear Shells due to the Tensor Force Otsuka, Takaharu; Suzuki, Toshio; Fujimoto, Rintaro Physical Review Letters, Vol. 95, Issue 23 https://doi.org/10.1103/PhysRevLett.95.232502	journal	November 2005
Variational procedure for nuclear shell-model calculations and energy-variance extrapolation Shimizu, Noritaka; Utsuno, Yutaka; Mizusaki, Takahiro Physical Review C, Vol. 85, Issue 5 https://doi.org/10.1103/PhysRevC.85.054301	journal	May 2012
Yrast structures in the neutron-rich isotopes ${}^{59, 60}{Fe}$ and the role of the $g_{9 / 2}$ orbital Deacon, A. N.; Freeman, S. J.; Janssens, R. V. F. Physical Review C, Vol. 76, Issue 5 https://doi.org/10.1103/PhysRevC.76.054303	journal	November 2007
High-precision $B (E 2)$ measurements of semi-magic ${}^{58, 60, 62, 64}{Ni}$ by Coulomb excitation Allmond, J. M.; Brown, B. A.; Stuchbery, A. E. Physical Review C, Vol. 90, Issue 3 https://doi.org/10.1103/PhysRevC.90.034309	journal	September 2014
Shape coexistence along $N = 40$ Liddick, S. N.; Suchyta, S.; Abromeit, B. Physical Review C, Vol. 84, Issue 6 https://doi.org/10.1103/PhysRevC.84.061305	journal	December 2011
In-beam γ -ray spectroscopy of Fe68 from charge exchange on Co68 projectiles Gade, A.; Janssens, R. V. F.; Brown, B. A. Physical Review C, Vol. 104, Issue 2 https://doi.org/10.1103/PhysRevC.104.024313	journal	August 2021
Structure of ${}^{60, 62}{Fe}$ and the onset of $ν g_{9 / 2}$ occupancy Hoteling, N.; Chiara, C. J.; Broda, R. Physical Review C, Vol. 82, Issue 4 https://doi.org/10.1103/PhysRevC.82.044305	journal	October 2010
Shape coexistence in ${}^{68}{Ni}$ Suchyta, S.; Liddick, S. N.; Tsunoda, Y. Physical Review C, Vol. 89, Issue 2 https://doi.org/10.1103/PhysRevC.89.021301	journal	February 2014
Single-particle and dipole excitations in Co62 Sensharma, N.; Ayangeakaa, A. D.; Janssens, R. V. F. Physical Review C, Vol. 105, Issue 4 https://doi.org/10.1103/PhysRevC.105.044315	journal	April 2022
Novel shape evolution in exotic Ni isotopes and configuration-dependent shell structure Tsunoda, Yusuke; Otsuka, Takaharu; Shimizu, Noritaka Physical Review C, Vol. 89, Issue 3 https://doi.org/10.1103/PhysRevC.89.031301	journal	March 2014
Shape isomerism at $N = 40$ : Discovery of a proton intruder state in ${}^{67}{Co}$ Pauwels, D.; Ivanov, O.; Bree, N. Physical Review C, Vol. 78, Issue 4 https://doi.org/10.1103/PhysRevC.78.041307	journal	October 2008
CHICO2, a two-dimensional pixelated parallel-plate avalanche counter Wu, C. Y.; Cline, D.; Hayes, A. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 814 https://doi.org/10.1016/j.nima.2016.01.034	journal	April 2016
Magic features of 68Ni Bernas, M.; Dessagne, Ph.; Langevin, M. Physics Letters B, Vol. 113, Issue 4 https://doi.org/10.1016/0370-2693(82)90039-9	journal	June 1982
Changes in <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>ν</mml:mi><mml:msub><mml:mi mathvariant="normal">g</mml:mi><mml:mrow><mml:mn>9</mml:mn><mml:mo stretchy="false">/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math> shape polarisation across the odd neutron-rich Cr isotopes Deacon, A. N.; Freeman, S. J.; Janssens, R. V. F. Physics Letters B, Vol. 622, Issue 1-2 https://doi.org/10.1016/j.physletb.2005.07.005	journal	August 2005
New $T = 1$ effective interactions for the $f_{5 ∕ 2} p_{3 ∕ 2} p_{1 ∕ 2} g_{9 ∕ 2}$ model space: Implications for valence-mirror symmetry and seniority isomers Lisetskiy, A. F.; Brown, B. A.; Horoi, M. Physical Review C, Vol. 70, Issue 4 https://doi.org/10.1103/PhysRevC.70.044314	journal	October 2004
Nature of yrast excitations near $N = 40$ : Level structure of $^{67}$ Ni Zhu, S.; Janssens, R. V. F.; Carpenter, M. P. Physical Review C, Vol. 85, Issue 3 https://doi.org/10.1103/PhysRevC.85.034336	journal	March 2012
Evidence for a new nuclear ‘magic number’ from the level structure of 54Ca Steppenbeck, D.; Takeuchi, S.; Aoi, N. Nature, Vol. 502, Issue 7470 https://doi.org/10.1038/nature12522	journal	October 2013
Collectivity at $N = 40$ in neutron-rich ${}^{64}{Cr}$ Gade, A.; Janssens, R. V. F.; Baugher, T. Physical Review C, Vol. 81, Issue 5 https://doi.org/10.1103/PhysRevC.81.051304	journal	May 2010
Shell-model description of neutron-rich pf-shell nuclei with a new effective interaction GXPF 1 Honma, M.; Otsuka, T.; Brown, B. A. The European Physical Journal A, Vol. 25, Issue S1 https://doi.org/10.1140/epjad/i2005-06-032-2	journal	April 2005
The performance of the Gamma-Ray Energy Tracking In-beam Nuclear Array GRETINA Paschalis, S.; Lee, I. Y.; Macchiavelli, A. O. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 709 https://doi.org/10.1016/j.nima.2013.01.009	journal	May 2013
$β$ -decay measurements for $N > 40$ Mn nuclei and inference of collectivity for neutron-rich Fe isotopes Daugas, J. M.; Matea, I.; Delaroche, J. -P. Physical Review C, Vol. 83, Issue 5 https://doi.org/10.1103/PhysRevC.83.054312	journal	May 2011
Measurements of g factors and lifetimes of low lying states in $^{58 - 64} Ni$ and their shell model implications Kenn, O.; Speidel, K. -H.; Ernst, R. Physical Review C, Vol. 63, Issue 6 https://doi.org/10.1103/PhysRevC.63.064306	journal	May 2001
78Ni revealed as a doubly magic stronghold against nuclear deformation Taniuchi, R.; Santamaria, C.; Doornenbal, P. Nature, Vol. 569, Issue 7754 https://doi.org/10.1038/s41586-019-1155-x	journal	May 2019
Multifaceted Quadruplet of Low-Lying Spin-Zero States in ${}^{66}{Ni}$ : Emergence of Shape Isomerism in Light Nuclei Leoni, S.; Fornal, B.; Mărginean, N. Physical Review Letters, Vol. 118, Issue 16 https://doi.org/10.1103/PhysRevLett.118.162502	journal	April 2017
Structure of 52,54Ti and shell closures in neutron-rich nuclei above 48Ca Janssens, R. V. F.; Fornal, B.; Mantica, P. F. Physics Letters B, Vol. 546, Issue 1-2 https://doi.org/10.1016/S0370-2693(02)02682-5	journal	October 2002
New evidence for a subshell gap at N=32 Prisciandaro, J. I.; Mantica, P. F.; Brown, B. A. Physics Letters B, Vol. 510, Issue 1-4 https://doi.org/10.1016/S0370-2693(01)00565-2	journal	June 2001
$N = 40$ Neutron Subshell Closure in the ${}^{68}{Ni}$ Nucleus Broda, R.; Fornal, B.; Królas, W. Physical Review Letters, Vol. 74, Issue 6 https://doi.org/10.1103/PhysRevLett.74.868	journal	February 1995
Decay properties of 68,69,70 Mn: Probing collectivity up to N = 44 in Fe isotopic chain Benzoni, G.; Morales, A. I.; Watanabe, H. Physics Letters B, Vol. 751 https://doi.org/10.1016/j.physletb.2015.10.025	journal	December 2015
Shape coexistence in neutron-rich nuclei near $N = 40$ Carpenter, M. P.; Janssens, R. V. F.; Zhu, S. Physical Review C, Vol. 87, Issue 4 https://doi.org/10.1103/PhysRevC.87.041305	journal	April 2013
Shape coexistence from lifetime and branching-ratio measurements in 68,70 Ni Crider, B. P.; Prokop, C. J.; Liddick, S. N. Physics Letters B, Vol. 763 https://doi.org/10.1016/j.physletb.2016.10.020	journal	December 2016

Similar Records

Determination of the spins and parities for the 04+ and 05+ states in Zr100

Journal Article · Tue Feb 13 00:00:00 EST 2024 · Physical Review. C · OSTI ID:1892378

Wu, Jin; Carpenter, Michael P.; Kondev, Filip G.; +12 more

Identification of excited states in Bi188 and Po188

Journal Article · Wed Aug 17 00:00:00 EDT 2022 · Physical Review. C · OSTI ID:1892378

Zhang, W. Q.; Andreyev, Andrei N.; Liu, Z.; +39 more

Octupole correlations near Te110

Journal Article · Thu Apr 29 00:00:00 EDT 2021 · Physical Review. C · OSTI ID:1892378

Testov, D. A.; Bakes, S.; Valiente-Dobón, J. J.; +36 more

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Electromagnetic transitions
Nuclear structure & decays
Nucleon distribution
Shell model
59 ≤ A ≤ 89
electromagnetic transitions
nuclear structure & decays
nucleon distribution
shell model

Title: Multistep Coulomb excitation of Ni 64 : Shape coexistence and nature of low-spin excitations

Citation Formats

References (48)

Similar Records

Related Subjects