Low-lying level structure of the neutron-unbound $\textit{N}$ = 7 isotones

Votaw, D.; DeYoung, P. A.; Baumann, T.; Blake, A.; Boone, J.; Brown, J.; Chrisman, D.; Finck, J. E.; Frank, N.; Gombas, J.; Guèye, P.; Hinnefeld, J.; Karrick, H.; Kuchera, A. N.; Liu, H.; Luther, B.; Ndayisabye, F.; Neal, M.; Owens-Fryar, J.; Pereira, J.; Persch, C.; Phan, T.; Redpath, T.; Rogers, W. F.; Stephenson, S.; Stiefel, K.; Sword, C.; Wantz, A.; Thoennessen, M.

doi:10.1103/physrevc.102.014325

Low-lying level structure of the neutron-unbound $$\textit{N}$$ = 7 isotones

Journal Article · Wed Jul 29 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.102.014325· OSTI ID:1643794

^[1]; DeYoung, P. A. ^[2]; Baumann, T. ^[3]; Blake, A. ^[4]; Boone, J. ^[5]; Brown, J. ^[6]; Chrisman, D. ^[3]; Finck, J. E. ^[7]; Frank, N. ^[8]; Gombas, J. ^[2]; Guèye, P. ^[9]; Hinnefeld, J. ^[10]; Karrick, H. ^[11]; Kuchera, A. N. ^[12]; Liu, H. ^[3]; Luther, B. ^[13]; Ndayisabye, F. ^[3]; Neal, M. ^[4]; Owens-Fryar, J. ^[14]; Pereira, J. ^[3] more »

Michigan State Univ., East Lansing, MI (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Michigan State University
Hope College, Holland, MI (United States)
Michigan State Univ., East Lansing, MI (United States)
Hampton University, VA (United States)
Indiana Wesleyan University, Marion, IN (United States)
Wabash College, Crawfordsville, IN (United States)
Central Michigan University, Mount Pleasant, MI (United States)
Augustana College, Rock Island, IL (United States)
Hampton University, VA (United States); Michigan State Univ., East Lansing, MI (United States)
Indiana University South Bend, IN (United States)
Augustana College, Rock Island, IL (United States); Western Michigan Univ., Kalamazoo MI (United States)
Davidson College, NC (United States)
St. John's College, Annapolis, MD (United States)
Rensselaer Polytechnic Inst., Troy, NY (United States)
Gettysburg College, PA (United States)
Michigan State Univ., East Lansing, MI (United States); American Physical Society, Ridge, NY (United States)

This article reports on results of an experimental search for ground state shell inversion in the neutron-unbound $$\textit{N}$$ = 7 isotones ⁹He and ¹⁰Li. Two different radioactive ion beams (¹¹Be, E_lab = 44 MeV/u and ¹²B, E_lab = 45 MeV/u) impinging on a beryllium target were used to directly and selectively populate unbound states of a given ℓ in the nuclides of interest. Be(¹¹Be, ⁸He + $$\textit{n}$$) and Be(¹²B, ⁸He + $$\textit{n}$$) reactions populated unbound states in ⁹He. Fragments and neutrons were detected in coincidence to reconstruct the decay energy of ⁹He using invariant mass spectroscopy. Similarly, Be(¹¹Be, ⁹Li + $$\textit{n}$$) and Be(¹²B, ⁹Li + $$\textit{n}$$) reactions were used to populate unbound states in ¹⁰Li, and the time-of-flight method was used to determine the relative velocity of the ⁹Li fragments and neutrons in coincidence. Various states in both ⁹He and ¹⁰Li were observed and characterized. Here, the data indicate possible ground state shell inversion in both cases.

View Accepted Manuscript (DOE)

Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: NSSC, MSU, NSCL/FRIB

Grant/Contract Number:: NA0000979; NA0003180

OSTI ID:: 1643794

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 1 Vol. 102; ISSN 2469-9985; ISSN 2469-9993

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

References (63)

Solution of the10Li-Puzzle: Mass and excited states Bohlen, H. G.; Gebauer, B.; von Lucke-Petsch, M. Zeitschrift für Physik A Hadrons and Nuclei, Vol. 344, Issue 4 https://doi.org/10.1007/BF01283193	journal	December 1993
Method for the study of neutron emission from light fragments in intermediate energy heavy-ion collisions Deák, F.; Kiss, A.; Seres, Z. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 258, Issue 1 https://doi.org/10.1016/0168-9002(87)90080-5	journal	July 1987
Bound state properties of Borromean halo nuclei: 6He and 11Li Zhukov, M. V.; Danilin, B. V.; Fedorov, D. V. Physics Reports, Vol. 231, Issue 4 https://doi.org/10.1016/0370-1573(93)90141-Y	journal	August 1993
The (9Be, 8B) reaction and the unbound nuclide 10Li Wilcox, K. H.; Weisenmiller, R. B.; Wozniak, G. J. Physics Letters B, Vol. 59, Issue 2 https://doi.org/10.1016/0370-2693(75)90687-5	journal	October 1975
Coulomb dissociation reaction and correlations of two halo neutrons in 11Li Shimoura, S.; Nakamura, T.; Ishihara, M. Physics Letters B, Vol. 348, Issue 1-2 https://doi.org/10.1016/0370-2693(95)00131-4	journal	March 1995
Nuclear structure studies of very neutron-rich isotopes of 7–10He, 9–11Li and 12–14Be via two-body reactions von Oertzen, W.; Bohlen, H. G.; Gebauer, B. Nuclear Physics A, Vol. 588, Issue 1 https://doi.org/10.1016/0375-9474(95)00111-D	journal	May 1995
Spectroscopy of exotic nuclei with multi-nucleon transfer reactions Bohlen, H. G.; Blazevicˇ, A.; Gebauer, B. Progress in Particle and Nuclear Physics, Vol. 42 https://doi.org/10.1016/S0146-6410(99)00056-3	journal	January 1999
Commissioning the A1900 projectile fragment separator Morrissey, D. J.; Sherrill, B. M.; Steiner, M. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 204 https://doi.org/10.1016/S0168-583X(02)01895-5	journal	May 2003
The program LISE: a simulation of fragment separators Bazin, D.; Tarasov, O.; Lewitowicz, M. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 482, Issue 1-2 https://doi.org/10.1016/S0168-9002(01)01504-2	journal	April 2002
MoNA—The Modular Neutron Array Luther, B.; Baumann, T.; Thoennessen, M. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 505, Issue 1-2 https://doi.org/10.1016/S0168-9002(03)01014-3	journal	June 2003
Focal plane detector for the S800 high-resolution spectrometer Yurkon, J.; Bazin, D.; Benenson, W. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 422, Issue 1-3 https://doi.org/10.1016/S0168-9002(98)00960-7	journal	February 1999
COSY INFINITY version 8 Makino, Kyoko; Berz, Martin Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 427, Issue 1-2 https://doi.org/10.1016/S0168-9002(98)01554-X	journal	May 1999
Evidence for an l=0 ground state in 9He Chen, L.; Blank, B.; Brown, B. A. Physics Letters B, Vol. 505, Issue 1-4 https://doi.org/10.1016/S0370-2693(01)00313-6	journal	April 2001
Identification of the 10Li ground state Chartier, M.; Beene, J. R.; Blank, B. Physics Letters B, Vol. 510, Issue 1-4 https://doi.org/10.1016/S0370-2693(01)00602-5	journal	June 2001
Core excitation in Begs via the p(Be,Be)d reaction Fortier, S.; Pita, S.; Winfield, J. S. Physics Letters B, Vol. 461, Issue 1-2 https://doi.org/10.1016/S0370-2693(99)00825-4	journal	August 1999
Reactions and single-particle structure of nuclei near the drip lines Hansen, P. G.; Sherrill, B. M. Nuclear Physics A, Vol. 693, Issue 1-2 https://doi.org/10.1016/S0375-9474(01)01104-6	journal	October 2001
Quasifree nucleon-knockout reactions from neutron-rich nuclei by a proton target: p(6He,pn)5He, p(11Li,pn)10Li, p(6He,2p)5H, and p(11Li,2p)10He Kobayashi, T.; Yoshida, K.; Ozawa, A. Nuclear Physics A, Vol. 616, Issue 1-2 https://doi.org/10.1016/S0375-9474(97)00092-4	journal	April 1997
Stud of weakly bound and unbound states of exotic nuclei with binary reactions Bohlen, H. G.; von Oertzen, W.; Stolla, Th. Nuclear Physics A, Vol. 616, Issue 1-2 https://doi.org/10.1016/S0375-9474(97)00096-1	journal	April 1997
Invariant-mass spectroscopy of 10Li and 11Li Zinser, M.; Humbert, F.; Nilsson, T. Nuclear Physics A, Vol. 619, Issue 1-2 https://doi.org/10.1016/S0375-9474(97)00134-6	journal	June 1997
Reconstruction of nuclear charged fragment trajectories from a large-gap sweeper magnet Frank, N.; Schiller, A.; Bazin, D. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 580, Issue 3 https://doi.org/10.1016/j.nima.2007.07.008	journal	October 2007
Modeling interactions of intermediate-energy neutrons in a plastic scintillator array with Geant4 Kohley, Z.; Lunderberg, E.; DeYoung, P. A. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 682 https://doi.org/10.1016/j.nima.2012.04.060	journal	August 2012
Systematic investigation of the drip-line nuclei 11Li and 14Be and their unbound subsystems 10Li and 13Be Simon, H.; Meister, M.; Aumann, T. Nuclear Physics A, Vol. 791, Issue 3-4 https://doi.org/10.1016/j.nuclphysa.2007.04.021	journal	July 2007
The unbound isotopes 9,10He Johansson, H. T.; Aksyutina, Yu.; Aumann, T. Nuclear Physics A, Vol. 842, Issue 1-4 https://doi.org/10.1016/j.nuclphysa.2010.04.006	journal	October 2010
Selective population of unbound states in 10Li Smith, J. K.; Baumann, T.; Brown, J. Nuclear Physics A, Vol. 940 https://doi.org/10.1016/j.nuclphysa.2015.04.011	journal	August 2015
Study of 10Li via the 9Li(2H, p) reaction at REX-ISOLDE Jeppesen, H. B.; Moro, A. M.; Bergmann, U. C. Physics Letters B, Vol. 642, Issue 5-6 https://doi.org/10.1016/j.physletb.2006.09.060	journal	November 2006
Lithium isotopes beyond the drip line Aksyutina, Yu.; Johansson, H. T.; Adrich, P. Physics Letters B, Vol. 666, Issue 5 https://doi.org/10.1016/j.physletb.2008.07.093	journal	September 2008
First evidence for a virtual 18B ground state Spyrou, A.; Baumann, T.; Bazin, D. Physics Letters B, Vol. 683, Issue 2-3 https://doi.org/10.1016/j.physletb.2009.12.016	journal	January 2010
Nuclear structure beyond the neutron drip line: The lowest energy states in 9 He via their T = 5/2 isobaric analogs in 9 Li Uberseder, E.; Rogachev, G. V.; Goldberg, V. Z. Physics Letters B, Vol. 754 https://doi.org/10.1016/j.physletb.2016.01.014	journal	March 2016
Investigation of the role of 10Li resonances in the halo structure of 11Li through the Li 11 ( p , d ) Li 10 transfer reaction Sanetullaev, A.; Kanungo, R.; Tanaka, J. Physics Letters B, Vol. 755 https://doi.org/10.1016/j.physletb.2016.02.060	journal	April 2016
Nuclear structure experiments along the neutron drip line Baumann, T.; Spyrou, A.; Thoennessen, M. Reports on Progress in Physics, Vol. 75, Issue 3 https://doi.org/10.1088/0034-4885/75/3/036301	journal	February 2012
Structure of the neutron-rich N = 7 isotones ¹⁰ Li and ⁹ He Falou, H. Al; Leprince, A.; Orr, Na Journal of Physics: Conference Series, Vol. 312, Issue 9 https://doi.org/10.1088/1742-6596/312/9/092012	journal	September 2011
Observation of three-neutron sequential emission from O * 25 Sword, C.; Brett, J.; Baumann, T. Physical Review C, Vol. 100, Issue 3 https://doi.org/10.1103/PhysRevC.100.034323	journal	September 2019
Neutron decay of Li 10 produced by fragmentation Kryger, R. A.; Azhari, A.; Galonsky, A. Physical Review C, Vol. 47, Issue 6 https://doi.org/10.1103/PhysRevC.47.R2439	journal	June 1993
Spectroscopy of the halo nucleus Li 11 by an experimental study of Li 11 + p collisions Korsheninnikov, A. A.; Nikolskii, E. Yu.; Kobayashi, T. Physical Review C, Vol. 53, Issue 2 https://doi.org/10.1103/PhysRevC.53.R537	journal	February 1996
Nuclear breakup of Borromean nuclei Bertsch, G. F.; Hencken, K.; Esbensen, H. Physical Review C, Vol. 57, Issue 3 https://doi.org/10.1103/PhysRevC.57.1366	journal	March 1998
Population of 10 Li by fragmentation Thoennessen, M.; Yokoyama, S.; Azhari, A. Physical Review C, Vol. 59, Issue 1 https://doi.org/10.1103/PhysRevC.59.111	journal	January 1999
Spectroscopy of the 10 Li nucleus Caggiano, J. A.; Bazin, D.; Benenson, W. Physical Review C, Vol. 60, Issue 6 https://doi.org/10.1103/PhysRevC.60.064322	journal	November 1999
Structure of the 10 Li nucleus investigated via the 9 Li ( d , p ) 10 Li reaction Santi, P.; Kolata, J. J.; Guimãraes, V. Physical Review C, Vol. 67, Issue 2 https://doi.org/10.1103/PhysRevC.67.024606	journal	February 2003
T = 5 / 2 states in 9 Li : Isobaric analog states of 9 He Rogachev, G. V.; Goldberg, V. Z.; Kolata, J. J. Physical Review C, Vol. 67, Issue 4 https://doi.org/10.1103/PhysRevC.67.041603	journal	April 2003
New insight into the low-energy He 9 spectrum Golovkov, M. S.; Grigorenko, L. V.; Fomichev, A. S. Physical Review C, Vol. 76, Issue 2 https://doi.org/10.1103/PhysRevC.76.021605	journal	August 2007
Observation of a two-neutron cascade from a resonance in O 24 Hoffman, C. R.; Baumann, T.; Brown, J. Physical Review C, Vol. 83, Issue 3 https://doi.org/10.1103/PhysRevC.83.031303	journal	March 2011
Spectroscopy of neutron-unbound 27 , 28 F Christian, G.; Frank, N.; Ash, S. Physical Review C, Vol. 85, Issue 3 https://doi.org/10.1103/PhysRevC.85.034327	journal	March 2012
Structure of unbound neutron-rich 9 He studied using single-neutron transfer Al Kalanee, T.; Gibelin, J.; Roussel-Chomaz, P. Physical Review C, Vol. 88, Issue 3 https://doi.org/10.1103/PhysRevC.88.034301	journal	September 2013
Neutron s states in loosely bound nuclei Hoffman, C. R.; Kay, B. P.; Schiffer, J. P. Physical Review C, Vol. 89, Issue 6 https://doi.org/10.1103/PhysRevC.89.061305	journal	June 2014
Low-lying neutron unbound states in Be 12 Smith, J. K.; Baumann, T.; Bazin, D. Physical Review C, Vol. 90, Issue 2 https://doi.org/10.1103/PhysRevC.90.024309	journal	August 2014
Structure of the exotic He 9 nucleus from the no-core shell model with continuum Vorabbi, Matteo; Calci, Angelo; Navrátil, Petr Physical Review C, Vol. 97, Issue 3 https://doi.org/10.1103/PhysRevC.97.034314	journal	March 2018
Energy spectrum of neutron-rich helium isotopes: Complex made simple Fossez, K.; Rotureau, J.; Nazarewicz, W. Physical Review C, Vol. 98, Issue 6 https://doi.org/10.1103/PhysRevC.98.061302	journal	December 2018
Determination of the N = 16 Shell Closure at the Oxygen Drip Line Hoffman, C. R.; Baumann, T.; Bazin, D. Physical Review Letters, Vol. 100, Issue 15 https://doi.org/10.1103/PhysRevLett.100.152502	journal	April 2008
Measurement of the Two-Halo Neutron Transfer Reaction H 1 ( Li 11 , Li 9 ) H 3 at 3 A MeV Tanihata, I.; Alcorta, M.; Bandyopadhyay, D. Physical Review Letters, Vol. 100, Issue 19 https://doi.org/10.1103/PhysRevLett.100.192502	journal	May 2008
N = 16 Spherical Shell Closure in O 24 Tshoo, K.; Satou, Y.; Bhang, H. Physical Review Letters, Vol. 109, Issue 2 https://doi.org/10.1103/PhysRevLett.109.022501	journal	July 2012
Evidence of Soft Dipole Resonance in Li 11 with Isoscalar Character Kanungo, R.; Sanetullaev, A.; Tanaka, J. Physical Review Letters, Vol. 114, Issue 19 https://doi.org/10.1103/PhysRevLett.114.192502	journal	May 2015
Investigation of the Li 10 shell inversion by neutron continuum transfer reaction Cavallaro, M.; De Napoli, M.; Cappuzzello, F. Physical Review Letters, Vol. 118, Issue 1 https://doi.org/10.1103/PhysRevLett.118.012701	journal	January 2017
Exotic Nucleus Helium-9 and its Excited States Seth, Kamal K.; Artuso, M.; Barlow, D. Physical Review Letters, Vol. 58, Issue 19 https://doi.org/10.1103/PhysRevLett.58.1930	journal	May 1987
Mass of Li 11 from the C 14 ( B 11 , Li 11 ) O 14 Reaction Young, B. M.; Benenson, W.; Fauerbach, M. Physical Review Letters, Vol. 71, Issue 25 https://doi.org/10.1103/PhysRevLett.71.4124	journal	December 1993
Parallel Momentum Distributions as a Probe of Halo Wave Functions Kelley, J. H.; Austin, Sam M.; Kryger, R. A. Physical Review Letters, Vol. 74, Issue 1 https://doi.org/10.1103/PhysRevLett.74.30	journal	January 1995
Study of the Unstable Nucleus L 10 i in Stripping Reactions of the Radioactive Projectiles B 11 e and L 11 i Zinser, M.; Humbert, F.; Nilsson, T. Physical Review Letters, Vol. 75, Issue 9 https://doi.org/10.1103/PhysRevLett.75.1719	journal	August 1995
One-Neutron Knockout from Individual Single-Particle States of B 11 e Aumann, T.; Navin, A.; Balamuth, D. P. Physical Review Letters, Vol. 84, Issue 1 https://doi.org/10.1103/PhysRevLett.84.35	journal	January 2000
Theoretical Prediction for the Ground State of H 10 e with the Method of Analytic Continuation in the Coupling Constant Aoyama, Shigeyoshi Physical Review Letters, Vol. 89, Issue 5 https://doi.org/10.1103/PhysRevLett.89.052501	journal	July 2002
Selective Population and Neutron Decay of an Excited State of O 23 Schiller, A.; Frank, N.; Baumann, T. Physical Review Letters, Vol. 99, Issue 11 https://doi.org/10.1103/PhysRevLett.99.112501	journal	September 2007
R-Matrix Theory of Nuclear Reactions Lane, A. M.; Thomas, R. G. Reviews of Modern Physics, Vol. 30, Issue 2 https://doi.org/10.1103/RevModPhys.30.257	journal	April 1958
System Testing and Installation of the NHMFL/NSCL Sweeper Magnet Bird, M. D.; Kenney, S. J.; Toth, J. IEEE Transactions on Appiled Superconductivity, Vol. 15, Issue 2 https://doi.org/10.1109/TASC.2005.849553	journal	June 2005
Study of the level structure of the lithium isotope ¹⁰ Li in stopped pion absorption Chernyshev, B. A.; Gurov, Yu. B.; Korotkova, L. Yu. International Journal of Modern Physics E, Vol. 24, Issue 01 https://doi.org/10.1142/S0218301315500044	journal	January 2015
Nuclear Halos Hansen, P. G.; Jensen, A. S.; Jonson, B. Annual Review of Nuclear and Particle Science, Vol. 45, Issue 1 https://doi.org/10.1146/annurev.ns.45.120195.003111	journal	December 1995

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