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Lund University Lund University Publications2000-01-01T00:00+00:001dailyQuasifree (p,pN) scattering of light neutron-rich nuclei near N=14
https://lup.lub.lu.se/search/publication/fb06d318-5c3f-4566-b707-28ddd667c9b4
Díaz Fernández, P.Alvarez-Pol, H.Crespo, R.Cravo, E.Atar, L.Deltuva, A.Aumann, T.Avdeichikov, V.Beceiro-Novo, S.Bemmerer, D.Benlliure, J.Bertulani, C. A.Boillos, J. M.Boretzky, K.Borge, M. J.G.Caamaño, M.Cabanelas, P.Caesar, C.Casarejos, E.Catford, W.Cederkäll, J.Chartier, M.Chulkov, L. V.Cortina-Gil, D.Datta Pramanik, U.Dillmann, I.Elekes, Z.Enders, J.Ershova, O.Estradé, A.Farinon, F.Fernández-Domínguez, B.Fraile, L. M.Freer, M.Galaviz, D.Geissel, H.Gernhäuser, R.Golubev, P.Göbel, K.Hagdahl, J.Heftrich, T.Heil, M.Heine, M.Heinz, A.Henriques, A.Holl, M.Hufnagel, A.Ignatov, A.Johansson, H. T.Knyazev, A.2018-02-09Background: For many years, quasifree scattering reactions in direct kinematics have been extensively used to study the structure of stable nuclei, demonstrating the potential of this approach. The RB3 collaboration has performed a pilot experiment to study quasifree scattering reactions in inverse kinematics for a stable C12 beam. The results from that experiment constitute the first quasifree scattering results in inverse and complete kinematics. This technique has lately been extended to exotic beams to investigate the evolution of shell structure, which has attracted much interest due to changes in shell structure if the number of protons or neutrons is varied. Purpose: In this work we investigate for the first time the quasifree scattering reactions (p,pn) and (p,2p) simultaneously for the same projectile in inverse and complete kinematics for radioactive beams with the aim to study the evolution of single-particle properties from N=14 to N=15. Method: The structure of the projectiles O23, O22, and N21 has been studied simultaneously via (p,pn) and (p,2p) quasifree knockout reactions in complete inverse kinematics, allowing the investigation of proton and neutron structure at the same time. The experimental data were collected at the R3B-LAND setup at GSI at beam energies of around 400 MeV/u. Two key observables have been studied to shed light on the structure of those nuclei: the inclusive cross sections and the corresponding momentum distributions. Conclusions: The knockout reactions (p,pn) and (p,2p) with radioactive beams in inverse kinematics have provided important and complementary information for the study of shell evolution and structure. For the (p,pn) channels, indications of a change in the structure of these nuclei moving from N=14 to N=15 have been observed, i.e., from the 0d5/2 shell to the 1s1/2. This supports previous observations of a subshell closure at N=14 for neutron-rich oxygen isotopes and its weakening for the nitrogen isotopes.http://lup.lub.lu.se/record/fb06d318-5c3f-4566-b707-28ddd667c9b4http://dx.doi.org/10.1103/PhysRevC.97.024311scopus:85042128067engPhysical Review C; 97(2), no 024311 (2018)ISSN: 2469-9985Subatomic PhysicsQuasifree (p,pN) scattering of light neutron-rich nuclei near N=14contributiontojournal/articleinfo:eu-repo/semantics/articletextQuasifree (p, 2p) Reactions on Oxygen Isotopes : Observation of Isospin Independence of the Reduced Single-Particle Strength
https://lup.lub.lu.se/search/publication/613b71e4-25ef-4711-b80e-2359dca8b2ad
Atar, L.Paschalis, S.Barbieri, C.Bertulani, C. A.Díaz Fernández, P.Holl, M.Najafi, M. A.Panin, V.Alvarez-Pol, H.Aumann, T.Avdeichikov, V.Beceiro-Novo, S.Bemmerer, D.Benlliure, J.Boillos, J. M.Boretzky, K.Borge, M. J.G.Caamaño, M.Caesar, C.Casarejos, E.Catford, W.Cederkall, J.Chartier, M.Chulkov, L.Cortina-Gil, D.Cravo, E.Crespo, R.Dillmann, I.Elekes, Z.Enders, J.Ershova, O.Estrade, A.Farinon, F.Fraile, L. M.Freer, M.Galaviz Redondo, D.Geissel, H.Gernhäuser, R.Golubev, P.Göbel, K.Hagdahl, J.Heftrich, T.Heil, M.Heine, M.Heinz, A.Henriques, A.Hufnagel, A.Ignatov, A.Johansson, H. T.Knyazev, A.2018-01-29Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the R3B/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type OA(p,2p)NA-1 have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.http://lup.lub.lu.se/record/613b71e4-25ef-4711-b80e-2359dca8b2adhttp://dx.doi.org/10.1103/PhysRevLett.120.052501scopus:85041303967pmid:29481189engPhysical Review Letters; 120(5), no 052501 (2018)ISSN: 0031-9007Subatomic PhysicsQuasifree (p, 2p) Reactions on Oxygen Isotopes : Observation of Isospin Independence of the Reduced Single-Particle Strengthcontributiontojournal/articleinfo:eu-repo/semantics/articletext