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Observation of the Exotic Isotope 13F Located Four Neutrons beyond the Proton Drip Line

Journal Article · · Physical Review Letters
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  1. Washington Univ., St. Louis, MO (United States); Washington University
  2. Washington Univ., St. Louis, MO (United States)
  3. Michigan State Univ., East Lansing, MI (United States)
  4. Univ. of Connecticut, Storrs, CT (United States)
  5. Western Michigan Univ., Kalamazoo MI (United States)
+ Show Author Affiliations
A 13F resonance was observed following a charge-exchange reaction between a fast 13O beam and a 9Be target. The resonance was found in the invariant-mass distribution of 3p+10C events and probably corresponds to a 5/2+ excited state. The ground state was also expected to be populated, but was not resolved from the background. The observed level decays via initial proton emissions to both the ground and first 2+ state of 12O, which subsequently undergo 2p decay. In addition there may also be a significant proton decay branch to the second 2+ level in 12O. The wavefunction associated with the observed level may be collectivized due to coupling to the continuum as is it located just above the threshold for proton decay to the second $$2^{+}_{2}$$ state of 12O.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; FG02-87ER40316
OSTI ID:
1773500
Alternate ID(s):
OSTI ID: 1862754
Report Number(s):
LLNL-JRNL-828164
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 126; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (23)

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journal July 2009
First observation of 14F journal September 2010
An above-barrier narrow resonance in 15 F journal July 2016
Particle decays of levels in N 11 , 12 and O 12 investigated with the invariant-mass method journal August 2019
Invariant-mass spectroscopy of O 14 excited states journal December 2019
Invariant-mass spectrum of O 11 journal April 2020
Single-nucleon knockout cross sections for reactions producing resonance states at or beyond the drip line journal October 2020
First two energy levels in 15 F journal September 2003
Low-lying levels in F 15 and the shell model potential for drip-line nuclei journal March 2004
Reexamination of the energy levels of F 15 by O 14 + H 1 elastic resonance scattering journal September 2005
Predictions for the first two positive-parity states of 13 F journal September 2012
Structure of the unbound nucleus 13 Be: One-neutron knockout reaction data from 14 Be analyzed in a holistic approach journal June 2013
Structure of 13 Be probed via secondary-beam reactions journal March 2014
Probing nuclear forces beyond the drip-line using the mirror nuclei N 16 and F 16 journal July 2014
Population of Be 13 in a nucleon exchange reaction journal November 2015
Proton-decaying states in light nuclei and the first observation of Na 17 journal April 2017
Structure of Be 13 studied in proton knockout from B 14 journal August 2018
Invariant-mass spectroscopy of Ne 18 ,   O 16 , and C 10 excited states formed in neutron-transfer reactions journal April 2019
Structure and decay of the extremely proton-rich nuclei O 11 , 12 journal May 2019
First Observation of Unbound O 11 , the Mirror of the Halo Nucleus Li 11 journal March 2019
Towards the Limits of Existence of Nuclear Structure: Observation and First Spectroscopy of the Isotope K 31 by Measuring Its Three-Proton Decay journal August 2019
On the Origin of Nuclear Clustering journal January 2012

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