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1. High-spin states beyond the proton drip-line: Quasiparticle alignments in 113Cs

Author

P.T. Wady, J.F. Smith, B. Hadinia, D.M. Cullen, S.J. Freeman, I.G. Darby, S. Eeckhaudt, T. Grahn, P.T. Greenlees, P.M. Jones, R. Julin, S. Juutinen, H. Kettunen, M. Leino, A.-P. Leppänen, B.M. McGuirk, P. Nieminen, M. Nyman, R.D. Page, J. Pakarinen, E.S. Paul, P. Rahkila, S.V. Rigby, C. Scholey, J. Uusitalo, and R. Wadsworth

Subjects
Physics, QC1-999
Abstract

Excited states have been studied in the deformed proton emitter 113Cs. Gamma-ray transitions have been unambiguously assigned to 113Cs by correlation with its characteristic proton decay, using the method of recoil-decay tagging. Two previously identified rotational bands have been observed and extended to tentative spins of 45/2 and 51/2ħ, with excitation energies over 8 MeV above the lowest state. These are the highest angular momenta and excitation energies observed to date in any nucleus beyond the proton drip-line. Transitions in the bands have been rearranged compared to previous work. A study of aligned angular momenta, in comparison to the predictions of Woods–Saxon cranking calculations, is consistent with the most intense band being based on the πg7/2[422]3/2+ configuration, which would contradict the earlier πh11/2 assignment, and with the second band being based on the πd5/2[420]1/2+ configuration. The data suggest that the band based upon the πh11/2 configuration is not observed. Keywords: Proton decay, Recoil-decay tagging, Gamma-ray spectroscopy, High-spin states, Quasiparticle alignments

Published
2015
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2. The use of EXOGAM for in-beam spectroscopy of proton drip-line nuclei with radioactive ion beams

Author

M. Petri, E.S. Paul, P.J. Nolan, A.J. Boston, H.C. Boston, R.J. Cooper, M.R. Dimmock, S. Gros, B.M. McGuirk, G. Turk, D. Guinet, Ph. Lautesse, M. Meyer, N. Redon, B. Rossé, Ch. Schmitt, O. Stézowski, S. Bhattacharyya, G. De France, G. Mukherjee, F. Rejmund, H. Savajols, J.N. Scheurer, J. Gál, J. Molnár, B.M. Nyakó, J. Timár, L. Zolnai, K. Juhász, A. Astier, I. Deloncle, M.G. Porquet, A. Prévost, V.F.E. Pucknell, R. Wadsworth, P. Joshi, G. La Rana, R. Moro, M. Trotta, E. Vardaci, G. Hackman, G.C. Ball, Oliver Lodge Laboratory, University of Liverpool, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences (BAS), Department of Information Technology, University of Debrecen, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), STFC Daresbury Laboratory, Daresbury Laboratory, Department of Physics, University of York [York, UK], Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (INFN, Sezione di Napoli), Istituto Nazionale di Fisica Nucleare (INFN), TRIUMF [Vancouver], EXOGAM, M., Petri, E. S., Paul, P. J., Nolan, A. J., Boston, H. C., Boston, R. J., Cooper, M. R., Dimmock, S., Gro, B. M., Mcguirk, G., Turk, D., Guinet, Lautesse, P. h., M., Meyer, N., Redon, B., Rossé, Schmitt, C. h., O., Stézowski, S., Bhattacharyya, G., De France, G., Mukherjee, F., Rejmund, H., Savajol, J. N., Scheurer, J., Gál, J., Molnár, B. M., Nyakó, J., Timár, L., Zolnai, K., Juhász, A., Astier, I., Deloncle, M. G., Porquet, A., Prévost, V. F. E., Pucknell, R., Wadsworth, P., Joshi, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, M., Trotta, Vardaci, Emanuele, G., Hackman, G. C. B. a. l., L., Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), University of Debrecen Egyetem [Debrecen], and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Radioactive ion beams, Nuclear and High Energy Physics, Proton, Fizikai tudományok, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, DIAMANT, Nuclear physics, EXOGAM, Recoil, Természettudományok, 0103 physical sciences, proton drip-line nuclei, 010306 general physics, Spectroscopy, Nuclear Experiment, Instrumentation, Line (formation), Physics, in-beam spectroscopy, Spectrometer, 010308 nuclear & particles physics, DIAMANT array of CsI charged-particle detectors, VAMOS, Physics::Accelerator Physics, Segmented Clover germanium detector, Linear polarisation, Atomic physics, Radioactive ion beam, EXOGAM array of HPGe detectors, Beam (structure)
Abstract

International audience; One of the first fusion–evaporation experiments using radioactive ion beams was performed at GANIL in order to study proton-rich nuclei of the light rare-earth region. The low production cross-section of the exotic species of interest, in combination with the low intensity of the beam and its induced background, demanded the use of a highly efficient experimental setup. This consisted of the EXOGAM γ-ray spectrometer coupled for the first time with both the DIAMANT charged-particle array and the VAMOS recoil spectrometer. In this report the experimental challenges of such studies will be discussed and the experimental achievements of the in-beam spectroscopy of proton drip-line nuclei using EXOGAM will be presented.

Published
2009
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