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

Journal Article · Mon Feb 29 23:00:00 EST 2016 · Physics Letters B

DOI: https://doi.org/10.1016/j.physletb.2016.01.014 · OSTI ID:1249054

Uberseder, E. ^[1]; Rogachev, G. V. ^[2]; Goldberg, V. Z. ^[2]; Koshchiy, E. ^[2]; Roeder, B. T. ^[2]; Alcorta, M. ^[3]; Chubarian, G. ^[2]; Davids, B. ^[3]; Fu, C. ^[4]; Hooker, J. ^[2]; Jayatissa, H. ^[2]; Melconian, D. ^[2]; Tribble, R. E. ^[2]

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

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.

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Research Organization:: Texas A&M Research Foundation, College Station, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-93ER40773

OSTI ID:: 1249054

Journal Information:: Physics Letters B, Journal Name: Physics Letters B Journal Issue: C Vol. 754; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Structure of C 9 through proton resonance scattering with the Texas Active Target detector Hooker, J.; Rogachev, G. V.; Koshchiy, E. Physical Review C, Vol. 100, Issue 5 https://doi.org/10.1103/physrevc.100.054618	journal	November 2019

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