1. Migration of nuclear shell gaps studied in the d(24Ne,p gamma)25Ne reaction
- Author
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Catford, W. N., Timis, C. N., Lemmon, R. C., Labiche, M., Orr, N.A., Fernandez-Dominguez, B., Chapman, R., Freer, M., Chartier, M., Savajols, H., Rejmund, M., Achouri, N.L., Amzal, N., Ashwood, N. I., Baldwin, T. D., Burns, M., Caballero, L., Casandjian, J.M., Curtis, N., De France, G., Gelletly, W., Liang, X., Pain, S. D., Pucknell, V. P. E., Rubio, B., Sorlin, O., Spohr, K., Theisen, Ch., Warner, D. D., Department of Physics, University of Surrey (UNIS), Nuclear Physics Group, STFC Daresbury Laboratory, School of Engineering and Science, University of the West of Scotland (UWS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Oliver Lodge Laboratory, University of Liverpool, School of Physics and Astronomy, University of Birmingham [Birmingham], Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Nuclear Theory (nucl-th) ,Nuclear Theory ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,21.10.Hw, 21.10.Jx, 23.20.Lv, 25.60.Je ,Nuclear Experiment (nucl-ex) ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment - Abstract
The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state's identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2- and 3/2- levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction., Phys. Rev. Lett. in press (4 pages, 3 figures)
- Published
- 2010