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class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1710.04706">arXiv:1710.04706</a> <span> [<a href="https://arxiv.org/pdf/1710.04706">pdf</a>, <a href="https://arxiv.org/format/1710.04706">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.96.054322">10.1103/PhysRevC.96.054322 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for excited states in $^{25}$O </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Jones%2C+M+D">M. D. Jones</a>, <a href="/search/?searchtype=author&query=Fossez%2C+K">K. Fossez</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Kuchera%2C+A+N">A. N. Kuchera</a>, <a href="/search/?searchtype=author&query=Michel%2C+N">N. Michel</a>, <a href="/search/?searchtype=author&query=Nazarewicz%2C+W">W. Nazarewicz</a>, <a href="/search/?searchtype=author&query=Rotureau%2C+J">J. Rotureau</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Stephenson%2C+S+L">S. L. Stephenson</a>, <a href="/search/?searchtype=author&query=Stiefel%2C+K">K. Stiefel</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a>, <a href="/search/?searchtype=author&query=Zegers%2C+R+G+T">R. G. T. Zegers</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1710.04706v1-abstract-short" style="display: inline;"> Theoretical calculations suggest the presence of low-lying excited states in $^{25}$O. Previous experimental searches by means of proton knockout on $^{26}$F produced no evidence for such excitations. We search for excited states in $^{25}$O using the ${ {}^{24}\text{O} (d,p) {}^{25}\text{O} }$ reaction. The theoretical analysis of excited states in unbound $^{25,27}$O is based on the configura… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.04706v1-abstract-full').style.display = 'inline'; document.getElementById('1710.04706v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.04706v1-abstract-full" style="display: none;"> Theoretical calculations suggest the presence of low-lying excited states in $^{25}$O. Previous experimental searches by means of proton knockout on $^{26}$F produced no evidence for such excitations. We search for excited states in $^{25}$O using the ${ {}^{24}\text{O} (d,p) {}^{25}\text{O} }$ reaction. The theoretical analysis of excited states in unbound $^{25,27}$O is based on the configuration interaction approach that accounts for couplings to the scattering continuum. We use invariant-mass spectroscopy to measure neutron-unbound states in $^{25}$O. For the theoretical approach, we use the complex-energy Gamow Shell Model and Density Matrix Renormalization Group method with a finite-range two-body interaction optimized to the bound states and resonances of $^{23-26}$O, assuming a core of $^{22}$O. We predict energies, decay widths, and asymptotic normalization coefficients. Our calculations in a large $spdf$ space predict several low-lying excited states in $^{25}$O of positive and negative parity, and we obtain an experimental limit on the relative cross section of a possible ${ {J}^蟺 = {1/2}^{+} }$ state with respect to the ground-state of $^{25}$O at $蟽_{1/2+}/蟽_{g.s.} = 0.25_{-0.25}^{+1.0}$. We also discuss how the observation of negative parity states in $^{25}$O could guide the search for the low-lying negative parity states in $^{27}$O. Previous experiments based on the proton knockout of $^{26}$F suffered from the low cross sections for the population of excited states in $^{25}$O because of low spectroscopic factors. In this respect, neutron transfer reactions carry more promise. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.04706v1-abstract-full').style.display = 'none'; document.getElementById('1710.04706v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 96, 054322 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1512.02528">arXiv:1512.02528</a> <span> [<a href="https://arxiv.org/pdf/1512.02528">pdf</a>, <a href="https://arxiv.org/ps/1512.02528">ps</a>, <a href="https://arxiv.org/format/1512.02528">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.92.051306">10.1103/PhysRevC.92.051306 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Two-Neutron Sequential Decay of $^{24}$O </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Jones%2C+M+D">M. D. Jones</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Brett%2C+J">J. Brett</a>, <a href="/search/?searchtype=author&query=Bullaro%2C+J">J. Bullaro</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Hammerton%2C+K">K. Hammerton</a>, <a href="/search/?searchtype=author&query=Hinnefeld%2C+J">J. Hinnefeld</a>, <a href="/search/?searchtype=author&query=Kohley%2C+Z">Z. Kohley</a>, <a href="/search/?searchtype=author&query=Kuchera%2C+A+N">A. N. Kuchera</a>, <a href="/search/?searchtype=author&query=Pereira%2C+J">J. Pereira</a>, <a href="/search/?searchtype=author&query=Rabeh%2C+A">A. Rabeh</a>, <a href="/search/?searchtype=author&query=Rogers%2C+W+F">W. F. Rogers</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Stephenson%2C+S+L">S. L. Stephenson</a>, <a href="/search/?searchtype=author&query=Stiefel%2C+K">K. Stiefel</a>, <a href="/search/?searchtype=author&query=Tuttle-Timm%2C+M">M. Tuttle-Timm</a>, <a href="/search/?searchtype=author&query=Zegers%2C+R+G+T">R. G. T. Zegers</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1512.02528v1-abstract-short" style="display: inline;"> A two-neutron unbound excited state of $^{24}$O was populated through a (d,d') reaction at 83.4 MeV/nucleon. A state at $E = 715 \pm 110$ (stat) $\pm 45 $ (sys) keV with a width of $螕< 2$ MeV was observed above the two-neutron separation energy placing it at 7.65 $\pm$ 0.2 MeV with respect to the ground state. Three-body correlations for the decay of $^{24}$O $\rightarrow$ $^{22}$O + $2n$ show cle… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1512.02528v1-abstract-full').style.display = 'inline'; document.getElementById('1512.02528v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1512.02528v1-abstract-full" style="display: none;"> A two-neutron unbound excited state of $^{24}$O was populated through a (d,d') reaction at 83.4 MeV/nucleon. A state at $E = 715 \pm 110$ (stat) $\pm 45 $ (sys) keV with a width of $螕< 2$ MeV was observed above the two-neutron separation energy placing it at 7.65 $\pm$ 0.2 MeV with respect to the ground state. Three-body correlations for the decay of $^{24}$O $\rightarrow$ $^{22}$O + $2n$ show clear evidence for a sequential decay through an intermediate state in $^{23}$O. Neither a di-neutron nor phase-space model for the three-body breakup were able to describe these correlations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1512.02528v1-abstract-full').style.display = 'none'; document.getElementById('1512.02528v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 December, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PhysRevC 92, 051306(R) (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1503.06191">arXiv:1503.06191</a> <span> [<a href="https://arxiv.org/pdf/1503.06191">pdf</a>, <a href="https://arxiv.org/ps/1503.06191">ps</a>, <a href="https://arxiv.org/format/1503.06191">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.91.034323">10.1103/PhysRevC.91.034323 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Three-body correlations in the ground-state decay of 26O </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Kohley%2C+Z">Z. Kohley</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Christian%2C+G">G. Christian</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Lunderberg%2C+E">E. Lunderberg</a>, <a href="/search/?searchtype=author&query=Jones%2C+M">M. Jones</a>, <a href="/search/?searchtype=author&query=Mosby%2C+S">S. Mosby</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1503.06191v1-abstract-short" style="display: inline;"> Background: Theoretical calculations have shown that the energy and angular correlations in the three-body decay of the two-neutron unbound O26 can provide information on the ground-state wave function, which has been predicted to have a dineutron configuration and 2n halo structure. Purpose: To use the experimentally measured three-body correlations to gain insight into the properties of O26, i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.06191v1-abstract-full').style.display = 'inline'; document.getElementById('1503.06191v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1503.06191v1-abstract-full" style="display: none;"> Background: Theoretical calculations have shown that the energy and angular correlations in the three-body decay of the two-neutron unbound O26 can provide information on the ground-state wave function, which has been predicted to have a dineutron configuration and 2n halo structure. Purpose: To use the experimentally measured three-body correlations to gain insight into the properties of O26, including the decay mechanism and ground-state resonance energy. Method: O26 was produced in a one-proton knockout reaction from F27 and the O24+n+n decay products were measured using the MoNA-Sweeper setup. The three-body correlations from the O26 ground-state resonance decay were extracted. The experimental results were compared to Monte Carlo simulations in which the resonance energy and decay mechanism were varied. Results: The measured three-body correlations were well reproduced by the Monte Carlo simulations but were not sensitive to the decay mechanism due to the experimental resolutions. However, the three-body correlations were found to be sensitive to the resonance energy of O26. A 1蟽 upper limit of 53 keV was extracted for the ground-state resonance energy of O26. Conclusions: Future attempts to measure the three-body correlations from the ground-state decay of O26 will be very challenging due to the need for a precise measurement of the O24 momentum at the reaction point in the target. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.06191v1-abstract-full').style.display = 'none'; document.getElementById('1503.06191v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 March, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 91, 034323 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.03127">arXiv:1501.03127</a> <span> [<a href="https://arxiv.org/pdf/1501.03127">pdf</a>, <a href="https://arxiv.org/ps/1501.03127">ps</a>, <a href="https://arxiv.org/format/1501.03127">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.91.017304">10.1103/PhysRevC.91.017304 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for unbound 15Be states in the 3n+12Be channel </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Kuchera%2C+A+N">A. N. Kuchera</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Christian%2C+G">G. Christian</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Jones%2C+M+D">M. D. Jones</a>, <a href="/search/?searchtype=author&query=Kohley%2C+Z">Z. Kohley</a>, <a href="/search/?searchtype=author&query=Mosby%2C+S">S. Mosby</a>, <a href="/search/?searchtype=author&query=Peters%2C+W+A">W. A. Peters</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1501.03127v1-abstract-short" style="display: inline;"> 15Be is expected to have low-lying 3/2+ and 5/2+ states. A first search did not observe the 3/2+ [A. Spyrou et al., Phys. Rev. C 84, 044309 (2011)], however, a resonance in 15Be was populated in a second attempt and determined to be unbound with respect to 14Be by 1.8(1) MeV with a tentative spin-parity assignment of 5/2+ [J. Snyder et al., Phys. Rev. C 88, 031303(R) (2013)]. Search for the predic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.03127v1-abstract-full').style.display = 'inline'; document.getElementById('1501.03127v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.03127v1-abstract-full" style="display: none;"> 15Be is expected to have low-lying 3/2+ and 5/2+ states. A first search did not observe the 3/2+ [A. Spyrou et al., Phys. Rev. C 84, 044309 (2011)], however, a resonance in 15Be was populated in a second attempt and determined to be unbound with respect to 14Be by 1.8(1) MeV with a tentative spin-parity assignment of 5/2+ [J. Snyder et al., Phys. Rev. C 88, 031303(R) (2013)]. Search for the predicted 15Be 3/2+ state in the three-neutron decay channel. A two-proton removal reaction from a 55 MeV/u 17C beam was used to populate neutron-unbound states in 15Be. The two-, three-, and four-body decay energies of the 12Be + neutron(s) detected in coincidence were reconstructed using invariant mass spectroscopy. Monte Carlo simulations were performed to extract the resonance and decay properties from the observed spectra. The low-energy regions of the decay energy spectra can be described with the first excited unbound state of 14Be (E_x=1.54 MeV, E_r=0.28 MeV). Including a state in 15Be that decays through the first excited 14Be state slightly improves the fit at higher energies though the cross section is small. A 15Be component is not needed to describe the data. If the 3/2+ state in 15Be is populated, the decay by three-neutron emission through 14Be is weak, less than or equal to 11% up to 4 MeV. In the best fit, 15Be is unbound with respect to 12Be by 1.4 MeV (unbound with respect to $14Be by 2.66 MeV) with a strength of 7%. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.03127v1-abstract-full').style.display = 'none'; document.getElementById('1501.03127v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 5 figures, accepted in Physical Review C</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1310.0990">arXiv:1310.0990</a> <span> [<a href="https://arxiv.org/pdf/1310.0990">pdf</a>, <a href="https://arxiv.org/ps/1310.0990">ps</a>, <a href="https://arxiv.org/format/1310.0990">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.88.041601">10.1103/PhysRevC.88.041601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exploiting neutron-rich radioactive ion beams to constrain the symmetry energy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Kohley%2C+Z">Z. Kohley</a>, <a href="/search/?searchtype=author&query=Christian%2C+G">G. Christian</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Jones%2C+M">M. Jones</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Snyder%2C+J">J. Snyder</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1310.0990v1-abstract-short" style="display: inline;"> The Modular Neutron Array (MoNA) and 4 Tm Sweeper magnet were used to measure the free neutrons and heavy charged particles from the radioactive ion beam induced 32Mg + 9Be reaction. The fragmentation reaction was simulated with the Constrained Molecular Dynamics model(CoMD), which demonstrated that the <N/Z> of the heavy fragments and free neutron multiplicities were observables sensitive to the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1310.0990v1-abstract-full').style.display = 'inline'; document.getElementById('1310.0990v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1310.0990v1-abstract-full" style="display: none;"> The Modular Neutron Array (MoNA) and 4 Tm Sweeper magnet were used to measure the free neutrons and heavy charged particles from the radioactive ion beam induced 32Mg + 9Be reaction. The fragmentation reaction was simulated with the Constrained Molecular Dynamics model(CoMD), which demonstrated that the <N/Z> of the heavy fragments and free neutron multiplicities were observables sensitive to the density dependence of the symmetry energy at sub-saturation densities. Through comparison of these simulations with the experimental data constraints on the density dependence of the symmetry energy were extracted. The advantage of radioactive ion beams as a probe of the symmetry energy is demonstrated through examination of CoMD calculations for stable and radioactive beam induced reactions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1310.0990v1-abstract-full').style.display = 'none'; document.getElementById('1310.0990v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 October, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 88, 041601(R) (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1305.0677">arXiv:1305.0677</a> <span> [<a href="https://arxiv.org/pdf/1305.0677">pdf</a>, <a href="https://arxiv.org/format/1305.0677">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nuclphysa.2013.05.001">10.1016/j.nuclphysa.2013.05.001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of a low-lying neutron-unbound state in 19C </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a>, <a href="/search/?searchtype=author&query=Mosby%2C+S">S. Mosby</a>, <a href="/search/?searchtype=author&query=Badger%2C+N+S">N. S. Badger</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/?searchtype=author&query=Bennett%2C+M">M. Bennett</a>, <a href="/search/?searchtype=author&query=Brown%2C+J">J. Brown</a>, <a href="/search/?searchtype=author&query=Christian%2C+G">G. Christian</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Gardner%2C+M">M. Gardner</a>, <a href="/search/?searchtype=author&query=Hook%2C+E+A">E. A. Hook</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Meyer%2C+D+A">D. A. Meyer</a>, <a href="/search/?searchtype=author&query=Mosby%2C+M">M. Mosby</a>, <a href="/search/?searchtype=author&query=Rogers%2C+W+F">W. F. Rogers</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Strongman%2C+M+J">M. J. Strongman</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1305.0677v1-abstract-short" style="display: inline;"> Proton removal reactions from a secondary 22N beam were utilized to populate unbound states in neutron-rich carbon isotopes. Neutrons were measured with the Modular Neutron Array (MoNA) in coincidence with carbon fragments. A resonance with a decay energy of 76(14) keV was observed in the system 18C+n corresponding to a state in 19C at an excitation energy of 653(95)keV. This resonance could corre… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1305.0677v1-abstract-full').style.display = 'inline'; document.getElementById('1305.0677v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1305.0677v1-abstract-full" style="display: none;"> Proton removal reactions from a secondary 22N beam were utilized to populate unbound states in neutron-rich carbon isotopes. Neutrons were measured with the Modular Neutron Array (MoNA) in coincidence with carbon fragments. A resonance with a decay energy of 76(14) keV was observed in the system 18C+n corresponding to a state in 19C at an excitation energy of 653(95)keV. This resonance could correspond to the first 5/2+ state which was recently speculated to be unbound in order to describe 1n and 2n removal cross section measurements from 20C. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1305.0677v1-abstract-full').style.display = 'none'; document.getElementById('1305.0677v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 May, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">accepted for publication in Nucl. Phys. A</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1304.4507">arXiv:1304.4507</a> <span> [<a href="https://arxiv.org/pdf/1304.4507">pdf</a>, <a href="https://arxiv.org/ps/1304.4507">ps</a>, <a href="https://arxiv.org/format/1304.4507">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nuclphysa.2013.04.004">10.1016/j.nuclphysa.2013.04.004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for $^{21}$C and constraints on $^{22}$C </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Mosby%2C+S">S. Mosby</a>, <a href="/search/?searchtype=author&query=Badger%2C+N+S">N. S. Badger</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/?searchtype=author&query=Bennett%2C+M">M. Bennett</a>, <a href="/search/?searchtype=author&query=Brown%2C+J">J. Brown</a>, <a href="/search/?searchtype=author&query=Christian%2C+G">G. Christian</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Gardner%2C+M">M. Gardner</a>, <a href="/search/?searchtype=author&query=Hinnefeld%2C+J+D">J. D. Hinnefeld</a>, <a href="/search/?searchtype=author&query=Hook%2C+E+A">E. A. Hook</a>, <a href="/search/?searchtype=author&query=Lunderberg%2C+E+M">E. M. Lunderberg</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Meyer%2C+D+A">D. A. Meyer</a>, <a href="/search/?searchtype=author&query=Mosby%2C+M">M. Mosby</a>, <a href="/search/?searchtype=author&query=Peaslee%2C+G+F">G. F. Peaslee</a>, <a href="/search/?searchtype=author&query=Rogers%2C+W+F">W. F. Rogers</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Snyder%2C+J">J. Snyder</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Strongman%2C+M+J">M. J. Strongman</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1304.4507v1-abstract-short" style="display: inline;"> A search for the neutron-unbound nucleus $^{21}$C was performed via the single proton removal reaction from a beam of 22 N at 68 MeV/u. Neutrons were detected with the Modular Neutron Array (MoNA) in coincidence with $^{20}$C fragments. No evidence for a low-lying state was found, and the reconstructed $^{20}$C+n decay energy spectrum could be described with an s-wave line shape with a scattering… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1304.4507v1-abstract-full').style.display = 'inline'; document.getElementById('1304.4507v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1304.4507v1-abstract-full" style="display: none;"> A search for the neutron-unbound nucleus $^{21}$C was performed via the single proton removal reaction from a beam of 22 N at 68 MeV/u. Neutrons were detected with the Modular Neutron Array (MoNA) in coincidence with $^{20}$C fragments. No evidence for a low-lying state was found, and the reconstructed $^{20}$C+n decay energy spectrum could be described with an s-wave line shape with a scattering length limit of |as| < 2.8 fm, consistent with shell model predictions. A comparison with a renormalized zero-range three-body model suggests that $^{22}$C is bound by less than 70 keV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1304.4507v1-abstract-full').style.display = 'none'; document.getElementById('1304.4507v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 April, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted for publication in Nuclear Physics A</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1303.2617">arXiv:1303.2617</a> <span> [<a href="https://arxiv.org/pdf/1303.2617">pdf</a>, <a href="https://arxiv.org/ps/1303.2617">ps</a>, <a href="https://arxiv.org/format/1303.2617">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.110.152501">10.1103/PhysRevLett.110.152501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study of two-neutron radioactivity in the decay of 26O </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Kohley%2C+Z">Z. Kohley</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/?searchtype=author&query=Christian%2C+G">G. Christian</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Jones%2C+M">M. Jones</a>, <a href="/search/?searchtype=author&query=Lunderberg%2C+E">E. Lunderberg</a>, <a href="/search/?searchtype=author&query=Mosby%2C+S">S. Mosby</a>, <a href="/search/?searchtype=author&query=Nagi%2C+T">T. Nagi</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Snyder%2C+J">J. Snyder</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1303.2617v1-abstract-short" style="display: inline;"> A new technique was developed to measure the lifetimes of neutron unbound nuclei in the picosecond range. The decay of 26O -> 24O+n+n was examined as it had been predicted to have an appreciable lifetime due to the unique structure of the neutron-rich oxygen isotopes. The half-life of 26O was extracted as 4.5^{+1.1}_{-1.5}(stat.) +/- 3 (sys.) ps. This corresponds to 26O having a finite lifetime at… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.2617v1-abstract-full').style.display = 'inline'; document.getElementById('1303.2617v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1303.2617v1-abstract-full" style="display: none;"> A new technique was developed to measure the lifetimes of neutron unbound nuclei in the picosecond range. The decay of 26O -> 24O+n+n was examined as it had been predicted to have an appreciable lifetime due to the unique structure of the neutron-rich oxygen isotopes. The half-life of 26O was extracted as 4.5^{+1.1}_{-1.5}(stat.) +/- 3 (sys.) ps. This corresponds to 26O having a finite lifetime at an 82% confidence level and, thus, suggests the possibility of two-neutron radioactivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.2617v1-abstract-full').style.display = 'none'; document.getElementById('1303.2617v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 March, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted to Phys. Rev. Lett</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1211.2178">arXiv:1211.2178</a> <span> [<a href="https://arxiv.org/pdf/1211.2178">pdf</a>, <a href="https://arxiv.org/format/1211.2178">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.5506/APhysPolB.44.543">10.5506/APhysPolB.44.543 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of Ground-State Two-Neutron Decay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a>, <a href="/search/?searchtype=author&query=Kohley%2C+Z">Z. Kohley</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Lunderberg%2C+E">E. Lunderberg</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Attanayake%2C+H">H. Attanayake</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/?searchtype=author&query=Brown%2C+B+A">B. A. Brown</a>, <a href="/search/?searchtype=author&query=Christian%2C+G">G. Christian</a>, <a href="/search/?searchtype=author&query=Divaratne%2C+D">D. Divaratne</a>, <a href="/search/?searchtype=author&query=Grimes%2C+S+M">S. M. Grimes</a>, <a href="/search/?searchtype=author&query=Haagsma%2C+A">A. Haagsma</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Mosby%2C+S">S. Mosby</a>, <a href="/search/?searchtype=author&query=Nagi%2C+T">T. Nagi</a>, <a href="/search/?searchtype=author&query=Peaslee%2C+G+F">G. F. Peaslee</a>, <a href="/search/?searchtype=author&query=Peters%2C+W+A">W. A. Peters</a>, <a href="/search/?searchtype=author&query=Schiller%2C+A">A. Schiller</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Snyder%2C+J">J. Snyder</a>, <a href="/search/?searchtype=author&query=Strongman%2C+M">M. Strongman</a>, <a href="/search/?searchtype=author&query=Volya%2C+A">A. Volya</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1211.2178v1-abstract-short" style="display: inline;"> Neutron decay spectroscopy has become a successful tool to explore nuclear properties of nuclei with the largest neutron-to-proton ratios. Resonances in nuclei located beyond the neutron dripline are accessible by kinematic reconstruction of the decay products. The development of two-neutron detection capabilities of the Modular Neutron Array (MoNA) at NSCL has opened up the possibility to search… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.2178v1-abstract-full').style.display = 'inline'; document.getElementById('1211.2178v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1211.2178v1-abstract-full" style="display: none;"> Neutron decay spectroscopy has become a successful tool to explore nuclear properties of nuclei with the largest neutron-to-proton ratios. Resonances in nuclei located beyond the neutron dripline are accessible by kinematic reconstruction of the decay products. The development of two-neutron detection capabilities of the Modular Neutron Array (MoNA) at NSCL has opened up the possibility to search for unbound nuclei which decay by the emission of two neutrons. Specifically this exotic decay mode was observed in 16Be and 26O. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.2178v1-abstract-full').style.display = 'none'; document.getElementById('1211.2178v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 November, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">To be published in Acta Physica Polonica B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1208.2969">arXiv:1208.2969</a> <span> [<a href="https://arxiv.org/pdf/1208.2969">pdf</a>, <a href="https://arxiv.org/ps/1208.2969">ps</a>, <a href="https://arxiv.org/format/1208.2969">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/420/1/012052">10.1088/1742-6596/420/1/012052 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exploring the neutron dripline two neutrons at a time: The first observations of the 26O and 16Be ground state resonances </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Kohley%2C+Z">Z. Kohley</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Lunderberg%2C+E">E. Lunderberg</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Attanayake%2C+H">H. Attanayake</a>, <a href="/search/?searchtype=author&query=Bauman%2C+T">T. Bauman</a>, <a href="/search/?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/?searchtype=author&query=Brown%2C+B+A">B. A. Brown</a>, <a href="/search/?searchtype=author&query=Christian%2C+G">G. Christian</a>, <a href="/search/?searchtype=author&query=Divaratne%2C+D">D. Divaratne</a>, <a href="/search/?searchtype=author&query=Grimes%2C+S+M">S. M. Grimes</a>, <a href="/search/?searchtype=author&query=Haagsma%2C+A">A. Haagsma</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Mosby%2C+S">S. Mosby</a>, <a href="/search/?searchtype=author&query=Nagi%2C+T">T. Nagi</a>, <a href="/search/?searchtype=author&query=Peaslee%2C+G+F">G. F. Peaslee</a>, <a href="/search/?searchtype=author&query=Peters%2C+W+A">W. A. Peters</a>, <a href="/search/?searchtype=author&query=Schiller%2C+A">A. Schiller</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Snyder%2C+J">J. Snyder</a>, <a href="/search/?searchtype=author&query=Strongman%2C+M+J">M. J. Strongman</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a>, <a href="/search/?searchtype=author&query=Volya%2C+A">A. Volya</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1208.2969v1-abstract-short" style="display: inline;"> The two-neutron unbound ground state resonances of $^{26}$O and $^{16}$Be were populated using one-proton knockout reactions from $^{27}$F and $^{17}$B beams. A coincidence measurement of 3-body system (fragment + n + n) allowed for the decay energy of the unbound nuclei to be reconstructed. A low energy resonance, $<$ 200 keV, was observed for the first time in the $^{24}$O + n + n system and ass… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1208.2969v1-abstract-full').style.display = 'inline'; document.getElementById('1208.2969v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1208.2969v1-abstract-full" style="display: none;"> The two-neutron unbound ground state resonances of $^{26}$O and $^{16}$Be were populated using one-proton knockout reactions from $^{27}$F and $^{17}$B beams. A coincidence measurement of 3-body system (fragment + n + n) allowed for the decay energy of the unbound nuclei to be reconstructed. A low energy resonance, $<$ 200 keV, was observed for the first time in the $^{24}$O + n + n system and assigned to the ground state of $^{26}$O. The $^{16}$Be ground state resonance was observed at 1.35 MeV. The 3-body correlations of the $^{14}$Be + n + n system were compared to simulations of a phase-space, sequential, and dineutron decay. The strong correlations in the n-n system from the experimental data could only be reproduced by the dineutron decay simulation providing the first evidence for a dineutron-like decay. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1208.2969v1-abstract-full').style.display = 'none'; document.getElementById('1208.2969v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 August, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Invited Talk given at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1203.1369">arXiv:1203.1369</a> <span> [<a href="https://arxiv.org/pdf/1203.1369">pdf</a>, <a href="https://arxiv.org/ps/1203.1369">ps</a>, <a href="https://arxiv.org/format/1203.1369">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.85.034327">10.1103/PhysRevC.85.034327 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spectroscopy of neutron-unbound $^{27,28}$F </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Christian%2C+G">G. Christian</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Ash%2C+S">S. Ash</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Gade%2C+A">A. Gade</a>, <a href="/search/?searchtype=author&query=Grinyer%2C+G+F">G. F. Grinyer</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Mosby%2C+M">M. Mosby</a>, <a href="/search/?searchtype=author&query=Mosby%2C+S">S. Mosby</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Snyder%2C+J">J. Snyder</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Strongman%2C+M+J">M. J. Strongman</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a>, <a href="/search/?searchtype=author&query=Warren%2C+M">M. Warren</a>, <a href="/search/?searchtype=author&query=Weisshaar%2C+D">D. Weisshaar</a>, <a href="/search/?searchtype=author&query=Wersal%2C+A">A. Wersal</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1203.1369v1-abstract-short" style="display: inline;"> The ground state of $^{28}$F has been observed as an unbound resonance $2\underline{2}0$ keV above the ground state of $^{27}$F. Comparison of this result with USDA/USDB shell model predictions leads to the conclusion that the $^{28}$F ground state is primarily dominated by $sd$-shell configurations. Here we present a detailed report on the experiment in which the ground state resonance of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1203.1369v1-abstract-full').style.display = 'inline'; document.getElementById('1203.1369v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1203.1369v1-abstract-full" style="display: none;"> The ground state of $^{28}$F has been observed as an unbound resonance $2\underline{2}0$ keV above the ground state of $^{27}$F. Comparison of this result with USDA/USDB shell model predictions leads to the conclusion that the $^{28}$F ground state is primarily dominated by $sd$-shell configurations. Here we present a detailed report on the experiment in which the ground state resonance of $^{28}$F was first observed. Additionally, we report the first observation of a neutron-unbound excited state in $^{27}$F at an excitation energy of $25\underline{0}0 (2\underline{2}0)$ keV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1203.1369v1-abstract-full').style.display = 'none'; document.getElementById('1203.1369v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 March, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 11 figures, Accepted for publication in Phys. Rev. C</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1202.3973">arXiv:1202.3973</a> <span> [<a href="https://arxiv.org/pdf/1202.3973">pdf</a>, <a href="https://arxiv.org/format/1202.3973">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.108.142503">10.1103/PhysRevLett.108.142503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence for the ground-state resonance of 26O </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Lunderberg%2C+E">E. Lunderberg</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Kohley%2C+Z">Z. Kohley</a>, <a href="/search/?searchtype=author&query=Attanayake%2C+H">H. Attanayake</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/?searchtype=author&query=Christian%2C+G">G. Christian</a>, <a href="/search/?searchtype=author&query=Divaratne%2C+D">D. Divaratne</a>, <a href="/search/?searchtype=author&query=Grimes%2C+S+M">S. M. Grimes</a>, <a href="/search/?searchtype=author&query=Haagsma%2C+A">A. Haagsma</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Mosby%2C+S">S. Mosby</a>, <a href="/search/?searchtype=author&query=Nagy%2C+T">T. Nagy</a>, <a href="/search/?searchtype=author&query=Peaslee%2C+G+F">G. F. Peaslee</a>, <a href="/search/?searchtype=author&query=Schiller%2C+A">A. Schiller</a>, <a href="/search/?searchtype=author&query=Snyder%2C+J">J. Snyder</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Strongman%2C+M+J">M. J. Strongman</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1202.3973v1-abstract-short" style="display: inline;"> Evidence for the ground state of the neutron-unbound nucleus 26O was observed for the first time in the single proton-knockout reaction from a 82 MeV/u 27F beam. Neutrons were measured in coincidence with 24O fragments. 26O was determined to be unbound by 150+50-150 keV from the observation of low-energy neutrons. This result agrees with recent shell model calculations based on microscopic two- an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.3973v1-abstract-full').style.display = 'inline'; document.getElementById('1202.3973v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1202.3973v1-abstract-full" style="display: none;"> Evidence for the ground state of the neutron-unbound nucleus 26O was observed for the first time in the single proton-knockout reaction from a 82 MeV/u 27F beam. Neutrons were measured in coincidence with 24O fragments. 26O was determined to be unbound by 150+50-150 keV from the observation of low-energy neutrons. This result agrees with recent shell model calculations based on microscopic two- and three-nucleon forces. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.3973v1-abstract-full').style.display = 'none'; document.getElementById('1202.3973v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 February, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted for Publication in Phys. Rev. Lett</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1201.1267">arXiv:1201.1267</a> <span> [<a href="https://arxiv.org/pdf/1201.1267">pdf</a>, <a href="https://arxiv.org/ps/1201.1267">ps</a>, <a href="https://arxiv.org/format/1201.1267">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.108.032501">10.1103/PhysRevLett.108.032501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exploring the Low-$Z$ Shore of the Island of Inversion at $N = 19$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Christian%2C+G">G. Christian</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Ash%2C+S">S. Ash</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/?searchtype=author&query=Brown%2C+J">J. Brown</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Gade%2C+A">A. Gade</a>, <a href="/search/?searchtype=author&query=Grinyer%2C+G+F">G. F. Grinyer</a>, <a href="/search/?searchtype=author&query=Grovom%2C+A">A. Grovom</a>, <a href="/search/?searchtype=author&query=Hinnefeld%2C+J+D">J. D. Hinnefeld</a>, <a href="/search/?searchtype=author&query=Lunderberg%2C+E+M">E. M. Lunderberg</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Mosby%2C+M">M. Mosby</a>, <a href="/search/?searchtype=author&query=Mosby%2C+S">S. Mosby</a>, <a href="/search/?searchtype=author&query=Nagi%2C+T">T. Nagi</a>, <a href="/search/?searchtype=author&query=Peaslee%2C+G+F">G. F. Peaslee</a>, <a href="/search/?searchtype=author&query=Rogers%2C+W+F">W. F. Rogers</a>, <a href="/search/?searchtype=author&query=Smith%2C+J+K">J. K. Smith</a>, <a href="/search/?searchtype=author&query=Snyder%2C+J">J. Snyder</a>, <a href="/search/?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/?searchtype=author&query=Strongman%2C+M+J">M. J. Strongman</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a>, <a href="/search/?searchtype=author&query=Warren%2C+M">M. Warren</a> , et al. (2 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1201.1267v1-abstract-short" style="display: inline;"> The technique of invariant mass spectroscopy has been used to measure, for the first time, the ground state energy of neutron-unbound $^{28}\textrm{F},$ determined to be a resonance in the $^{27}\textrm{F} + n$ continuum at $2\underline{2}0 (\underline{5}0)$ keV. States in $^{28}\textrm{F}$ were populated by the reactions of a 62 MeV/u $^{29}\textrm{Ne}$ beam impinging on a 288 $\textrm{mg/cm}^2$… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.1267v1-abstract-full').style.display = 'inline'; document.getElementById('1201.1267v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1201.1267v1-abstract-full" style="display: none;"> The technique of invariant mass spectroscopy has been used to measure, for the first time, the ground state energy of neutron-unbound $^{28}\textrm{F},$ determined to be a resonance in the $^{27}\textrm{F} + n$ continuum at $2\underline{2}0 (\underline{5}0)$ keV. States in $^{28}\textrm{F}$ were populated by the reactions of a 62 MeV/u $^{29}\textrm{Ne}$ beam impinging on a 288 $\textrm{mg/cm}^2$ beryllium target. The measured $^{28}\textrm{F}$ ground state energy is in good agreement with USDA/USDB shell model predictions, indicating that $pf$ shell intruder configurations play only a small role in the ground state structure of $^{28}\textrm{F}$ and establishing a low-$Z$ boundary of the island of inversion for N=19 isotones. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.1267v1-abstract-full').style.display = 'none'; document.getElementById('1201.1267v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 January, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures, to be published in Phys. Rev. Lett</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1104.0255">arXiv:1104.0255</a> <span> [<a href="https://arxiv.org/pdf/1104.0255">pdf</a>, <a href="https://arxiv.org/format/1104.0255">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.83.057304">10.1103/PhysRevC.83.057304 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Neutron knockout of 12Be populating neutron-unbound states in 11Be </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Peters%2C+W+A">William A. Peters</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Brown%2C+B+A">B. A. Brown</a>, <a href="/search/?searchtype=author&query=Brown%2C+J">J. Brown</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Jones%2C+K+L">K. L. Jones</a>, <a href="/search/?searchtype=author&query=Lecouey%2C+J+-">J. -L. Lecouey</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Peaslee%2C+G+F">G. F. Peaslee</a>, <a href="/search/?searchtype=author&query=Rogers%2C+W+F">W. F. Rogers</a>, <a href="/search/?searchtype=author&query=Schiller%2C+A">A. Schiller</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a>, <a href="/search/?searchtype=author&query=Tostevin%2C+J+A">J. A. Tostevin</a>, <a href="/search/?searchtype=author&query=Yoneda%2C+K">K. Yoneda</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1104.0255v2-abstract-short" style="display: inline;"> Neutron-unbound resonant states of 11Be were populated in neutron knock-out reactions from 12Be and identified by 10Be-n coincidence measurements. A resonance in the decay-energy spectrum at 80(2) keV was attributed to a highly excited unbound state in 11Be at 3.949(2) MeV decaying to the 2+ excited state in 10Be. A knockout cross section of 15(3) mb was inferred for this 3.949(2) MeV state sugges… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.0255v2-abstract-full').style.display = 'inline'; document.getElementById('1104.0255v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1104.0255v2-abstract-full" style="display: none;"> Neutron-unbound resonant states of 11Be were populated in neutron knock-out reactions from 12Be and identified by 10Be-n coincidence measurements. A resonance in the decay-energy spectrum at 80(2) keV was attributed to a highly excited unbound state in 11Be at 3.949(2) MeV decaying to the 2+ excited state in 10Be. A knockout cross section of 15(3) mb was inferred for this 3.949(2) MeV state suggesting a spectroscopic factor near unity for this 0p3/2- level, consistent with the detailed shell model calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.0255v2-abstract-full').style.display = 'none'; document.getElementById('1104.0255v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 2 figures \pacs{29.38.Db, 29.30.Hs, 24.50.+g, 21.10.Pc, 21.10.Hw, 27.20.+n} \keywords{neutron decay spectroscopy, neutron-unbound states in 11Be}</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.C83:057304,2011 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0708.2708">arXiv:0708.2708</a> <span> [<a href="https://arxiv.org/pdf/0708.2708">pdf</a>, <a href="https://arxiv.org/ps/0708.2708">ps</a>, <a href="https://arxiv.org/format/0708.2708">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/9789812779038_0003">10.1142/9789812779038_0003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Population of neutron unbound states via two-proton knockout reactions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/?searchtype=author&query=Gade%2C+A">A. Gade</a>, <a href="/search/?searchtype=author&query=Lecouey%2C+J+-">J. -L. Lecouey</a>, <a href="/search/?searchtype=author&query=Peters%2C+W+A">W. A. Peters</a>, <a href="/search/?searchtype=author&query=Scheit%2C+H">H. Scheit</a>, <a href="/search/?searchtype=author&query=Schiller%2C+A">A. Schiller</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a>, <a href="/search/?searchtype=author&query=Brown%2C+J">J. Brown</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Hinnefeld%2C+J">J. Hinnefeld</a>, <a href="/search/?searchtype=author&query=Howes%2C+R">R. Howes</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0708.2708v1-abstract-short" style="display: inline;"> The two-proton knockout reaction 9Be(26Ne,O2p) was used to explore excited unbound states of 23O and 24O. In 23O a state at an excitation energy of 2.79(13) MeV was observed. There was no conclusive evidence for the population of excited states in 24O. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0708.2708v1-abstract-full" style="display: none;"> The two-proton knockout reaction 9Be(26Ne,O2p) was used to explore excited unbound states of 23O and 24O. In 23O a state at an excitation energy of 2.79(13) MeV was observed. There was no conclusive evidence for the population of excited states in 24O. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0708.2708v1-abstract-full').style.display = 'none'; document.getElementById('0708.2708v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 August, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures, Proc. 9th Int. Spring Seminar on Nucl. Phys. Changing Facets of Nuclear Structure, May 20-34, 2007</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0708.2706">arXiv:0708.2706</a> <span> [<a href="https://arxiv.org/pdf/0708.2706">pdf</a>, <a href="https://arxiv.org/ps/0708.2706">ps</a>, <a href="https://arxiv.org/format/0708.2706">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Observation of the First Excited State in 23O </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Schiller%2C+A">A. Schiller</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/?searchtype=author&query=Brown%2C+J">J. Brown</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Gade%2C+A">A. Gade</a>, <a href="/search/?searchtype=author&query=Hinnefeld%2C+J">J. Hinnefeld</a>, <a href="/search/?searchtype=author&query=Howes%2C+R">R. Howes</a>, <a href="/search/?searchtype=author&query=Lecouey%2C+J+-">J. -L. Lecouey</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Peters%2C+W+A">W. A. Peters</a>, <a href="/search/?searchtype=author&query=Scheit%2C+H">H. Scheit</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0708.2706v1-abstract-short" style="display: inline;"> The first excited state in neutron-rich 23O was observed in a (2p1n) knock-out reaction from 26Ne on a beryllium target at a beam energy of 86 MeV/A. The state is unbound with respect to neutron emission and was reconstructed from the invariant mass from the 22O fragment and the neutron. It is unbound by 45(2) keV corresponding to an excitation energy of 2.8(1) MeV. The non-observation of furthe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0708.2706v1-abstract-full').style.display = 'inline'; document.getElementById('0708.2706v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0708.2706v1-abstract-full" style="display: none;"> The first excited state in neutron-rich 23O was observed in a (2p1n) knock-out reaction from 26Ne on a beryllium target at a beam energy of 86 MeV/A. The state is unbound with respect to neutron emission and was reconstructed from the invariant mass from the 22O fragment and the neutron. It is unbound by 45(2) keV corresponding to an excitation energy of 2.8(1) MeV. The non-observation of further resonances implies a predominantly direct reaction mechanism of the employed three-nucleon-removal reaction which suggests the assignment of the observed resonance to be the 5/2+ hole state. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0708.2706v1-abstract-full').style.display = 'none'; document.getElementById('0708.2706v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 August, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 3 figures, Proc. 23rd Winter Workshop on Nuclear Dynamics, February 11-18, 2007</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0708.2573">arXiv:0708.2573</a> <span> [<a href="https://arxiv.org/pdf/0708.2573">pdf</a>, <a href="https://arxiv.org/ps/0708.2573">ps</a>, <a href="https://arxiv.org/format/0708.2573">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.2827247">10.1063/1.2827247 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exploring Neutron-Rich Oxygen Isotopes with MoNA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/?searchtype=author&query=Brown%2C+J">J. Brown</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Gade%2C+A">A. Gade</a>, <a href="/search/?searchtype=author&query=Hinnefeld%2C+J">J. Hinnefeld</a>, <a href="/search/?searchtype=author&query=Howes%2C+R">R. Howes</a>, <a href="/search/?searchtype=author&query=Lecouey%2C+J+-">J. -L. Lecouey</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Peters%2C+W+A">W. A. Peters</a>, <a href="/search/?searchtype=author&query=Scheit%2C+H">H. Scheit</a>, <a href="/search/?searchtype=author&query=Schiller%2C+A">A. Schiller</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0708.2573v1-abstract-short" style="display: inline;"> The Modular Neutron Array (MoNA) was used in conjunction with a large-gap dipole magnet (Sweeper) to measure neutron-unbound states in oxygen isotopes close to the neutron dripline. While no excited states were observed in 24O, a resonance at 45(2) keV above the neutron separation energy was observed in 23O. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0708.2573v1-abstract-full" style="display: none;"> The Modular Neutron Array (MoNA) was used in conjunction with a large-gap dipole magnet (Sweeper) to measure neutron-unbound states in oxygen isotopes close to the neutron dripline. While no excited states were observed in 24O, a resonance at 45(2) keV above the neutron separation energy was observed in 23O. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0708.2573v1-abstract-full').style.display = 'none'; document.getElementById('0708.2573v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 August, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 Figures, submitted to Proc. Int. Conf. on Proton Emitting Nuclei and Related Topics, PROCON07</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> AIPConf.Proc.961:143-148,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0612024">arXiv:nucl-ex/0612024</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0612024">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0612024">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0612024">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.99.072503">10.1103/PhysRevLett.99.072503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Selective population and neutron decay of the first excited state of semi-magic O-23 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Schiller%2C+A">A. Schiller</a>, <a href="/search/?searchtype=author&query=Frank%2C+N">N. Frank</a>, <a href="/search/?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/?searchtype=author&query=Brown%2C+B+A">B. A. Brown</a>, <a href="/search/?searchtype=author&query=Brown%2C+J">J. Brown</a>, <a href="/search/?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/?searchtype=author&query=Finck%2C+J+E">J. E. Finck</a>, <a href="/search/?searchtype=author&query=Gade%2C+A">A. Gade</a>, <a href="/search/?searchtype=author&query=Hinnefeld%2C+J">J. Hinnefeld</a>, <a href="/search/?searchtype=author&query=Howes%2C+R">R. Howes</a>, <a href="/search/?searchtype=author&query=Lecouey%2C+J+-">J. -L. Lecouey</a>, <a href="/search/?searchtype=author&query=Luther%2C+B">B. Luther</a>, <a href="/search/?searchtype=author&query=Peters%2C+W+A">W. A. Peters</a>, <a href="/search/?searchtype=author&query=Scheit%2C+H">H. Scheit</a>, <a href="/search/?searchtype=author&query=Thoennessen%2C+M">M. Thoennessen</a>, <a href="/search/?searchtype=author&query=Tostevin%2C+J+A">J. A. Tostevin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="nucl-ex/0612024v1-abstract-short" style="display: inline;"> We have observed an excited state in the neutron-rich semi-magic nucleus O-23 for the first time. No such states have been found in previous searches using gamma-ray spectroscopy. The observation of a resonance in n-fragment coincidence measurements confirms the speculation in the literature that the lowest excited state is neutron unbound and establishes positive evidence for a 2.8(1) MeV excit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0612024v1-abstract-full').style.display = 'inline'; document.getElementById('nucl-ex/0612024v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0612024v1-abstract-full" style="display: none;"> We have observed an excited state in the neutron-rich semi-magic nucleus O-23 for the first time. No such states have been found in previous searches using gamma-ray spectroscopy. The observation of a resonance in n-fragment coincidence measurements confirms the speculation in the literature that the lowest excited state is neutron unbound and establishes positive evidence for a 2.8(1) MeV excitation energy of the first excited state in O-23. The non-observation of a predicted second excited state is explained assuming selectivity of inner-shell knockout reactions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0612024v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0612024v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 December, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2006. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages including 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.99:112501,2007 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" 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