Nuclear structure beyond the neutron drip line. The lowest energy states in 9He via their T=5/2 isobaric analogs in 9Li

Uberseder, E.; Rogachev, G. V.; Goldberg, V. Z.; Koshchiy, E.; Roeder, B. T.; Alcorta, M.; Chubarian, G.; Davids, B.; Fu, C.; Hooker, J.; Jayatissa, H.; Melconian, D.; Tribble, R. E.

doi:10.1016/j.physletb.2016.01.014

Title: Nuclear structure beyond the neutron drip line. The lowest energy states in ⁹He via their T=5/2 isobaric analogs in ⁹Li

Abstract

The level structure of the very neutron rich and unbound ⁹He nucleus has been the subject of significant experimental and theoretical study. Many recent works have claimed that the two lowest energy ⁹He states exist with spins J^π=1/2⁺and Jπ=1/2^-and widths on the order of 100–200 keV. These find-ings cannot be reconciled with our contemporary understanding of nuclear structure. Our present work is the first high-resolution study with low statistical uncertainty of the relevant excitation energy range in the ⁸He+n system, performed via a search for the T =5/2 isobaric analog states in ⁹Li populated through ⁸He+p elastic scattering. Moreover, the present data show no indication of any narrow structures. Instead, we find evidence for a broad J^π=1/2⁺state in ⁹He located approximately 3 MeV above the neutron decay threshold.

Authors:

Uberseder, E. ^[1]; Rogachev, G. V. ^[1]; Goldberg, V. Z. ^[1]; Koshchiy, E. ^[1]; Roeder, B. T. ^[1]; Alcorta, M. ^[2]; Chubarian, G. ^[1]; Davids, B. ^[2]; Fu, C. ^[3]; Hooker, J. ^[1]; Jayatissa, H. ^[1]; Melconian, D. ^[1]; Tribble, R. E. ^[1]

Texas A & M Univ., College Station, TX (United States)
TRIUMF, Vancouver, BC (Canada)
Shanghai Jiao Tong Univ. (China)

Publication Date:: Tue Mar 01 00:00:00 EST 2016

Research Org.:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1249054

Grant/Contract Number:: FG02-93ER40773

Resource Type:: Accepted Manuscript

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Volume: 754; Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Uberseder, E., Rogachev, G. V., Goldberg, V. Z., Koshchiy, E., Roeder, B. T., Alcorta, M., Chubarian, G., Davids, B., Fu, C., Hooker, J., Jayatissa, H., Melconian, D., and Tribble, R. E. Nuclear structure beyond the neutron drip line. The lowest energy states in 9He via their T=5/2 isobaric analogs in 9Li.  United States: N. p., 2016. 
Web.  doi:10.1016/j.physletb.2016.01.014.

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                    Uberseder, E., Rogachev, G. V., Goldberg, V. Z., Koshchiy, E., Roeder, B. T., Alcorta, M., Chubarian, G., Davids, B., Fu, C., Hooker, J., Jayatissa, H., Melconian, D., & Tribble, R. E. Nuclear structure beyond the neutron drip line. The lowest energy states in 9He via their T=5/2 isobaric analogs in 9Li.  United States.  https://doi.org/10.1016/j.physletb.2016.01.014

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                    Uberseder, E., Rogachev, G. V., Goldberg, V. Z., Koshchiy, E., Roeder, B. T., Alcorta, M., Chubarian, G., Davids, B., Fu, C., Hooker, J., Jayatissa, H., Melconian, D., and Tribble, R. E. Tue .  
"Nuclear structure beyond the neutron drip line. The lowest energy states in 9He via their T=5/2 isobaric analogs in 9Li".  United States.  https://doi.org/10.1016/j.physletb.2016.01.014.  https://www.osti.gov/servlets/purl/1249054.

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@article{osti_1249054,

  title        = {Nuclear structure beyond the neutron drip line. The lowest energy states in 9He via their T=5/2 isobaric analogs in 9Li},

  author       = {Uberseder, E. and Rogachev, G. V. and Goldberg, V. Z. and Koshchiy, E. and Roeder, B. T. and Alcorta, M. and Chubarian, G. and Davids, B. and Fu, C. and Hooker, J. and Jayatissa, H. and Melconian, D. and Tribble, R. E.},

  abstractNote = {The level structure of the very neutron rich and unbound 9He nucleus has been the subject of significant experimental and theoretical study. Many recent works have claimed that the two lowest energy 9He states exist with spins Jπ=1/2+and Jπ=1/2-and widths on the order of 100–200 keV. These find-ings cannot be reconciled with our contemporary understanding of nuclear structure. Our present work is the first high-resolution study with low statistical uncertainty of the relevant excitation energy range in the 8He+n system, performed via a search for the T =5/2 isobaric analog states in 9Li populated through 8He+p elastic scattering. Moreover, the present data show no indication of any narrow structures. Instead, we find evidence for a broad Jπ=1/2+state in 9He located approximately 3 MeV above the neutron decay threshold.},

  doi          = {10.1016/j.physletb.2016.01.014},

  journal      = {Physics Letters B},

  number       = C,

  volume       = 754,

  place        = {United States},

  year         = {Tue Mar 01 00:00:00 EST 2016},

  month        = {Tue Mar 01 00:00:00 EST 2016}

}

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Works referenced in this record:

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Al Kalanee, T.; Gibelin, J.; Roussel-Chomaz, P.
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journal, August 2014

Volya, A.; Zelevinsky, V.
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journal, April 2001

Chen, L.; Blank, B.; Brown, B. A.
Physics Letters B, Vol. 505, Issue 1-4
DOI: 10.1016/S0370-2693(01)00313-6

$T = 5 / 2$ states in $^{9} Li :$ Isobaric analog states of $^{9} He$
journal, April 2003

Rogachev, G. V.; Goldberg, V. Z.; Kolata, J. J.
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journal, December 2003

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journal, December 2004

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journal, March 1976

Meyer, H. O.; Plattner, G. R.; Sick, I.
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Works referencing / citing this record:

Structure of ${}^{9}C$ through proton resonance scattering with the Texas Active Target detector
journal, November 2019

Hooker, J.; Rogachev, G. V.; Koshchiy, E.
Physical Review C, Vol. 100, Issue 5
DOI: 10.1103/physrevc.100.054618

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Similar Records

Title: Nuclear structure beyond the neutron drip line. The lowest energy states in 9He via their T=5/2 isobaric analogs in 9Li

Abstract

Citation Formats

Structure of unbound neutron-rich 9 He studied using single-neutron transfer journal, September 2013

Exotic Nucleus Helium-9 and its Excited States journal, May 1987

Nuclear structure studies of very neutron-rich isotopes of 7–10He, 9–11Li and 12–14Be via two-body reactions journal, May 1995

Spectroscopy of exotic nuclei with multi-nucleon transfer reactions journal, January 1999

The unbound isotopes 9,10He journal, October 2010

New insight into the low-energy He 9 spectrum journal, August 2007

Continuum shell model and nuclear physics at the edge of stability journal, August 2014

Evidence for an l=0 ground state in 9He journal, April 2001

T = 5 / 2 states in 9 Li : Isobaric analog states of 9 He journal, April 2003

The Ame2003 atomic mass evaluation journal, December 2003

Energy levels of light nuclei journal, December 2004

Elasticp+12C scattering between 0.3 and 2 MeV journal, March 1976

Energy levels of light nuclei A = 13–15 journal, February 1991

Theory of Isobaric-Spin Analogue Resonances journal, February 1965

Neutron Spectroscopic Factors from Isobaric Analog States journal, September 1968

Structure of C 9 through proton resonance scattering with the Texas Active Target detector journal, November 2019

Title: Nuclear structure beyond the neutron drip line. The lowest energy states in ⁹He via their T=5/2 isobaric analogs in ⁹Li

Structure of unbound neutron-rich $^{9}$ He studied using single-neutron transfer
journal, September 2013

Exotic Nucleus Helium-9 and its Excited States
journal, May 1987

Nuclear structure studies of very neutron-rich isotopes of 7–10He, 9–11Li and 12–14Be via two-body reactions
journal, May 1995

Spectroscopy of exotic nuclei with multi-nucleon transfer reactions
journal, January 1999

The unbound isotopes 9,10He
journal, October 2010

New insight into the low-energy ${}^{9}{He}$ spectrum
journal, August 2007

Continuum shell model and nuclear physics at the edge of stability
journal, August 2014

Evidence for an l=0 ground state in 9He
journal, April 2001

$T = 5 / 2$ states in $^{9} Li :$ Isobaric analog states of $^{9} He$
journal, April 2003

The Ame2003 atomic mass evaluation
journal, December 2003

Energy levels of light nuclei
journal, December 2004

Elasticp+12C scattering between 0.3 and 2 MeV
journal, March 1976

Energy levels of light nuclei A = 13–15
journal, February 1991

Theory of Isobaric-Spin Analogue Resonances
journal, February 1965

Neutron Spectroscopic Factors from Isobaric Analog States
journal, September 1968

Structure of ${}^{9}C$ through proton resonance scattering with the Texas Active Target detector
journal, November 2019