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Key Ne19 States Identified Affecting γ -Ray Emission from F18 in Novae
Hall, M. R.,Bardayan, D. W.,Baugher, T.,Lepailleur, A.,Pain, S. D.,Ratkiewicz, A.,Ahn, S.,Allen, J. M.,Anderson, J. T.,Ayangeakaa, A. D.,Blackmon, J. C.,Burcher, S.,Carpenter, M. P.,Cha, S. M.,Chae, K American Physical Society 2019 Physical Review Letters Vol.122 No.5
New γ -ray transitions observed in Ne19 with implications for the O15(α,γ)Ne19 reaction rate
Hall, M. R.,Bardayan, D. W.,Baugher, T.,Lepailleur, A.,Pain, S. D.,Ratkiewicz, A.,Ahn, S.,Allen, J. M.,Anderson, J. T.,Ayangeakaa, A. D.,Blackmon, J. C.,Burcher, S.,Carpenter, M. P.,Cha, S. M.,Chae, K American Physical Society 2019 Physical Review C Vol.99 No.3
Structure ofSn107studied through single-neutron knockout reactions
Cerizza, G.,Ayres, A.,Jones, K. L.,Grzywacz, R.,Bey, A.,Bingham, C.,Cartegni, L.,Miller, D.,Padgett, S.,Baugher, T.,Bazin, D.,Berryman, J. S.,Gade, A.,McDaniel, S.,Ratkiewicz, A.,Shore, A.,Stroberg, S American Physical Society 2016 Physical Review C Vol.93 No.2
<P>The neutron-deficient nucleus Sn-107 has been studied by using the one-neutron knockout reaction. By measuring the decay gamma rays and momentum distributions of reaction residues, the spins of the ground, 5/2(+), and first-excited, 7/2(+), states of Sn-107 have been assigned by comparisons to eikonal-model reaction calculations. Limits on the inclusive and exclusive cross sections have been measured and transitions due to neutron removals from below the N = 50 closed shell have been observed. New excited states up to 5.5 MeV in Sn-107 have been identified.</P>
Proton Decay of 21Na for 20Ne Energy Levels
Kim M. J.,Chae K. Y.,Cha S. M.,Ahn S. H.,Bardayan D. W.,Chipps K. A.,Cizewski J. A.,Howard M. E.,Manning B.,Ratkiewicz A.,Kozub R. L.,Kwak K.,Matos M.,O’Malley P. D.,Strauss S.,Pain S. D.,Pittman S. T 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.5
The 24Mg(p,α)21Na transfer reaction has been previously studied for a spectroscopic study of 21Na [Cha et al., Phys. Rev. C 96, 025810 (2017)]. In this follow-up analysis, the proton decays of the excited states of the radionuclide 21Na, which were measured simultaneously, are reported. By investigating the coincidence between the reaction α-particles and decay protons, we were able to identify three groups of events that are associated with the energy levels in 20Ne. The 20Ne excitation energy plot was obtained as a result. The four lowest known energy levels in 20Ne (the ground state and excited states at Ex = 1.633, 4.247 and 4.966 MeV) were clearly observed.
24Mg(p, α)21Na Reaction Study for Spectroscopy of 21Na
차수미,K. Y. Chae,김아람,E. J. Lee,S. Ahn,D. W. Bardayan,K. A. Chipps,J. A. Cizewski,M. E. Howard,B. Manning,P. D. O’Malley,A. Ratkiewicz,S. Strauss,R. L. Kozub,M. Matos,S. D. Pain,S. T. Pittman,M. S. Smith 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.8
The 24Mg(p, α)21Na reaction was measured at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory in order to better constrain the spins and parities of the energy levels in 21Na for the astrophysically important 17F(α, p)20Ne reaction rate calculation. 31-MeV proton beams from the 25-MV tandem accelerator and enriched 24Mg solid targets were used. Recoiling 4He particles from the 24Mg(p, α)21Na reaction were detected by a highly segmented silicon detector array which measured the yields of 4He particles over a range of angles simultaneously. A new level at 6661 ± 5 keV was observed in the present work. The extracted angular distributions for the first four levels of 21Na and the results from distorted wave Born approximation (DWBA) calculations were compared to verify and extract the angular momentum transfer.