Physics Letters B (Dec 2020)
Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number
- R. Avigo,
- O. Wieland,
- A. Bracco,
- F. Camera,
- F. Ameil,
- T. Arici,
- A. Ataç,
- D. Barrientos,
- D. Bazzacco,
- P. Bednarczyk,
- G. Benzoni,
- B. Birkenbach,
- N. Blasi,
- H.C. Boston,
- S. Bottoni,
- S. Brambilla,
- B. Bruyneel,
- M. Ciemała,
- E. Clément,
- M.L. Cortés,
- F.C.L. Crespi,
- D.M. Cullen,
- D. Curien,
- F. Didierjean,
- C. Domingo-Pardo,
- G. Duchêne,
- J. Eberth,
- A. Görgen,
- A. Gadea,
- J. Gerl,
- N. Goel,
- P. Golubev,
- V. González,
- M. Górska,
- A. Gottardo,
- E. Gregor,
- G. Guastalla,
- T. Habermann,
- L.J. Harkness-Brennan,
- A. Jungclaus,
- M. Kmiecik,
- I. Kojouharov,
- W. Korten,
- N. Kurz,
- M. Labiche,
- N. Lalović,
- S. Leoni,
- M. Lettmann,
- A. Maj,
- R. Menegazzo,
- D. Mengoni,
- E. Merchan,
- B. Million,
- A.I. Morales,
- D.R. Napoli,
- C. Nociforo,
- J. Nyberg,
- N. Pietralla,
- S. Pietri,
- Zs. Podolyák,
- V.Yu. Ponomarev,
- A. Pullia,
- B. Quintana,
- G. Rainovski,
- D. Ralet,
- F. Recchia,
- M. Reese,
- P. Regan,
- P. Reiter,
- S. Riboldi,
- D. Rudolph,
- M.D. Salsac,
- E. Sanchis,
- L.G. Sarmiento,
- H. Schaffner,
- J. Simpson,
- O. Stezowski,
- J.J. Valiente-Dobón,
- H.J. Wollersheim
Affiliations
- R. Avigo
- INFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, Italy
- O. Wieland
- INFN, Sezione di Milano, I-20133 Milano, Italy; Corresponding author.
- A. Bracco
- INFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, Italy
- F. Camera
- INFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, Italy
- F. Ameil
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- T. Arici
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- A. Ataç
- Department of Physics, Royal Institute of Technology KTH, SE-10691 Stockholm, Sweden
- D. Barrientos
- CERN, CH-1211 Geneva 23, Switzerland
- D. Bazzacco
- INFN, Sezione di Padova, I-35131 Padova, Italy
- P. Bednarczyk
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, Poland
- G. Benzoni
- INFN, Sezione di Milano, I-20133 Milano, Italy
- B. Birkenbach
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
- N. Blasi
- INFN, Sezione di Milano, I-20133 Milano, Italy
- H.C. Boston
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, UK
- S. Bottoni
- INFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, Italy
- S. Brambilla
- INFN, Sezione di Milano, I-20133 Milano, Italy
- B. Bruyneel
- IRFU, CEA/DSM, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
- M. Ciemała
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, Poland
- E. Clément
- GANIL, CEA/DSAM and CNRS/IN2P3, BP 55027, F-14076 CAEN Cedex 05, France
- M.L. Cortés
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- F.C.L. Crespi
- INFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, Italy
- D.M. Cullen
- Nuclear Physics Group, Schuster Laboratory, University of Manchester, Manchester, M13 9PL, UK
- D. Curien
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
- F. Didierjean
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
- C. Domingo-Pardo
- IFIC, CSIC-Universidad de Valencia, 46980 Paterna, Valencia, Spain
- G. Duchêne
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
- J. Eberth
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
- A. Görgen
- Department of Physics, University of Oslo, P. O. Box 1048 Blindern, N-0316 Oslo, Norway
- A. Gadea
- IFIC, CSIC-Universidad de Valencia, 46980 Paterna, Valencia, Spain
- J. Gerl
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- N. Goel
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- P. Golubev
- Department of Physics, Lund University, SE-22100 Lund, Sweden
- V. González
- IFIC, CSIC-Universidad de Valencia, 46980 Paterna, Valencia, Spain
- M. Górska
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- A. Gottardo
- INFN, Sezione di Padova, I-35131 Padova, Italy; INFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy
- E. Gregor
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- G. Guastalla
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- T. Habermann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- L.J. Harkness-Brennan
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, UK
- A. Jungclaus
- Instituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, Spain
- M. Kmiecik
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, Poland
- I. Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- W. Korten
- IRFU, CEA/DSM, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
- N. Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- M. Labiche
- STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UK
- N. Lalović
- Department of Physics, Lund University, SE-22100 Lund, Sweden
- S. Leoni
- INFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, Italy
- M. Lettmann
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
- A. Maj
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, Poland
- R. Menegazzo
- INFN, Sezione di Padova, I-35131 Padova, Italy
- D. Mengoni
- INFN, Sezione di Padova, I-35131 Padova, Italy; Dipartimento di Fisica ed Astronomia Galileo Galilei Universita' degli Studi di Padova, I-35131 Padova, Italy
- E. Merchan
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- B. Million
- INFN, Sezione di Milano, I-20133 Milano, Italy
- A.I. Morales
- INFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, Italy
- D.R. Napoli
- INFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy
- C. Nociforo
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- J. Nyberg
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
- N. Pietralla
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
- S. Pietri
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- Zs. Podolyák
- Department of Physics, University of Surrey, Guidford, GU-27XH, UK
- V.Yu. Ponomarev
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
- A. Pullia
- INFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, Italy
- B. Quintana
- Laboratorio de Radiaciones Ionizantes, Universidad de Salamanca, E-37008 Salamanca, Spain
- G. Rainovski
- Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria
- D. Ralet
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany; Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
- F. Recchia
- INFN, Sezione di Padova, I-35131 Padova, Italy; Dipartimento di Fisica ed Astronomia Galileo Galilei Universita' degli Studi di Padova, I-35131 Padova, Italy
- M. Reese
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
- P. Regan
- Department of Physics, University of Surrey, Guidford, GU-27XH, UK
- P. Reiter
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
- S. Riboldi
- INFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, Italy
- D. Rudolph
- Department of Physics, Lund University, SE-22100 Lund, Sweden
- M.D. Salsac
- IRFU, CEA/DSM, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
- E. Sanchis
- Department of Electronic, Engineering Universidad de Valencia, E-46100 Valencia, Spain
- L.G. Sarmiento
- Department of Physics, Lund University, SE-22100 Lund, Sweden
- H. Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- J. Simpson
- STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UK
- O. Stezowski
- Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, France
- J.J. Valiente-Dobón
- INFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy
- H.J. Wollersheim
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- Journal volume & issue
-
Vol. 811
p. 135951
Abstract
The γ-ray emission from the nuclei 62,64Fe following Coulomb excitation at bombarding energy of 400-440 AMeV was measured with special focus on E1 transitions in the energy region 4-8 MeV. The unstable neutron-rich nuclei 62,64Fe were produced at the FAIR-GSI laboratories and selected with the FRS spectrometer. The γ decay was detected with AGATA. From the measured γ-ray spectra the summed E1 strength is extracted and compared to microscopic quasi-particle phonon model calculations. The trend of the E1 strength with increasing neutron number is found to be fairly well reproduced with calculations that assume a rather complex structure of the 1− states (three-phonon states) inducing a strong fragmentation of the E1 nuclear response below the neutron binding energy.
