Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number
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 s...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2020-12-01
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| Series: | Physics Letters B |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269320307541 |
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| language |
English |
| format |
Article |
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DOAJ |
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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 |
| spellingShingle |
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 Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number Physics Letters B 64Fe 62Fe Nuclear structure Dipole excitation around neutron threshold |
| author_facet |
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 |
| author_sort |
R. Avigo |
| title |
Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number |
| title_short |
Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number |
| title_full |
Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number |
| title_fullStr |
Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number |
| title_full_unstemmed |
Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number |
| title_sort |
low-lying electric dipole γ-continuum for the unstable 62,64fe nuclei: strength evolution with neutron number |
| publisher |
Elsevier |
| series |
Physics Letters B |
| issn |
0370-2693 |
| publishDate |
2020-12-01 |
| description |
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. |
| topic |
64Fe 62Fe Nuclear structure Dipole excitation around neutron threshold |
| url |
http://www.sciencedirect.com/science/article/pii/S0370269320307541 |
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doaj-2a01456d4ffa41de947198f3b3cd46962020-12-09T04:14:38ZengElsevierPhysics Letters B0370-26932020-12-01811135951Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron numberR. Avigo0O. Wieland1A. Bracco2F. Camera3F. Ameil4T. Arici5A. Ataç6D. Barrientos7D. Bazzacco8P. Bednarczyk9G. Benzoni10B. Birkenbach11N. Blasi12H.C. Boston13S. Bottoni14S. Brambilla15B. Bruyneel16M. Ciemała17E. Clément18M.L. Cortés19F.C.L. Crespi20D.M. Cullen21D. Curien22F. Didierjean23C. Domingo-Pardo24G. Duchêne25J. Eberth26A. Görgen27A. Gadea28J. Gerl29N. Goel30P. Golubev31V. González32M. Górska33A. Gottardo34E. Gregor35G. Guastalla36T. Habermann37L.J. Harkness-Brennan38A. Jungclaus39M. Kmiecik40I. Kojouharov41W. Korten42N. Kurz43M. Labiche44N. Lalović45S. Leoni46M. Lettmann47A. Maj48R. Menegazzo49D. Mengoni50E. Merchan51B. Million52A.I. Morales53D.R. Napoli54C. Nociforo55J. Nyberg56N. Pietralla57S. Pietri58Zs. Podolyák59V.Yu. Ponomarev60A. Pullia61B. Quintana62G. Rainovski63D. Ralet64F. Recchia65M. Reese66P. Regan67P. Reiter68S. Riboldi69D. Rudolph70M.D. Salsac71E. Sanchis72L.G. Sarmiento73H. Schaffner74J. Simpson75O. Stezowski76J.J. Valiente-Dobón77H.J. Wollersheim78INFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, ItalyINFN, Sezione di Milano, I-20133 Milano, Italy; Corresponding author.INFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, ItalyINFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, ItalyGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyDepartment of Physics, Royal Institute of Technology KTH, SE-10691 Stockholm, SwedenCERN, CH-1211 Geneva 23, SwitzerlandINFN, Sezione di Padova, I-35131 Padova, ItalyInstitute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, PolandINFN, Sezione di Milano, I-20133 Milano, ItalyInstitut für Kernphysik, Universität zu Köln, D-50937 Köln, GermanyINFN, Sezione di Milano, I-20133 Milano, ItalyOliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, UKINFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, ItalyINFN, Sezione di Milano, I-20133 Milano, ItalyIRFU, CEA/DSM, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, FranceInstitute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, PolandGANIL, CEA/DSAM and CNRS/IN2P3, BP 55027, F-14076 CAEN Cedex 05, FranceInstitut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyINFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, ItalyNuclear Physics Group, Schuster Laboratory, University of Manchester, Manchester, M13 9PL, UKUniversité de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, FranceUniversité de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, FranceIFIC, CSIC-Universidad de Valencia, 46980 Paterna, Valencia, SpainUniversité de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, FranceInstitut für Kernphysik, Universität zu Köln, D-50937 Köln, GermanyDepartment of Physics, University of Oslo, P. O. Box 1048 Blindern, N-0316 Oslo, NorwayIFIC, CSIC-Universidad de Valencia, 46980 Paterna, Valencia, SpainGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyDepartment of Physics, Lund University, SE-22100 Lund, SwedenIFIC, CSIC-Universidad de Valencia, 46980 Paterna, Valencia, SpainGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyINFN, Sezione di Padova, I-35131 Padova, Italy; INFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, ItalyGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyInstitut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyOliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, UKInstituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, SpainInstitute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, PolandGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyIRFU, CEA/DSM, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, FranceGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanySTFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UKDepartment of Physics, Lund University, SE-22100 Lund, SwedenINFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, ItalyInstitut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, GermanyInstitute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, PolandINFN, Sezione di Padova, I-35131 Padova, ItalyINFN, Sezione di Padova, I-35131 Padova, Italy; Dipartimento di Fisica ed Astronomia Galileo Galilei Universita' degli Studi di Padova, I-35131 Padova, ItalyGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyINFN, Sezione di Milano, I-20133 Milano, ItalyINFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, ItalyINFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, ItalyGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyDepartment of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, SwedenInstitut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, GermanyGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyDepartment of Physics, University of Surrey, Guidford, GU-27XH, UKInstitut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, GermanyINFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, ItalyLaboratorio de Radiaciones Ionizantes, Universidad de Salamanca, E-37008 Salamanca, SpainFaculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, BulgariaGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany; Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, GermanyINFN, Sezione di Padova, I-35131 Padova, Italy; Dipartimento di Fisica ed Astronomia Galileo Galilei Universita' degli Studi di Padova, I-35131 Padova, ItalyInstitut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, GermanyDepartment of Physics, University of Surrey, Guidford, GU-27XH, UKInstitut für Kernphysik, Universität zu Köln, D-50937 Köln, GermanyINFN, Sezione di Milano, I-20133 Milano, Italy; Dipartimento di Fisica Universita' degli Studi di Milano, I-20133 Milano, ItalyDepartment of Physics, Lund University, SE-22100 Lund, SwedenIRFU, CEA/DSM, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, FranceDepartment of Electronic, Engineering Universidad de Valencia, E-46100 Valencia, SpainDepartment of Physics, Lund University, SE-22100 Lund, SwedenGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanySTFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UKUniversité Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, FranceINFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, ItalyGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyThe 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.http://www.sciencedirect.com/science/article/pii/S037026932030754164Fe62FeNuclear structureDipole excitation around neutron threshold |