Mark-Christoph Spieker, Nadja Tsoneva, Vera Derya, Janis Endres, Deniz Savran, Muhsin N. Harakeh, Sotirios Harissopulos, Rolf-Dietmar Herzberg, Anastasios Lagoyannis, Horst Lenske, Norbert Pietralla, Lucia Popescu, Marcus Scheck, Friederike Schlüter, Kerstin Sonnabend, Victor Ionuț Stoica, Heinrich Wörtche, Andreas Zilges
- We present an extensive experimental study of the recently predicted pygmy quadrupole resonance (PQR) in Sn isotopes, where complementary probes were used. In this study, (α,α' γ ) and (γ , γ') experiments were performed on 124Sn. In both reactions, Jπ = 2+ states below an excitation energy of 5 MeV were populated. The E2 strength integrated over the full transition densities could be extracted from the (γ , γ') experiment, while the (α,α'γ ) experiment at the chosen kinematics strongly favors the excitation of surface modes because of the strong α-particle absorption in the nuclear interior. The excitation of such modes is in accordance with the quadrupole-type oscillation of the neutron skin predicted by a microscopic approach based on self-consistent density functional theory and the quasiparticle-phonon model (QPM). The newly determined γ -decay branching ratios hint at a non-statistical character of the E2 strength, as it has also been recently pointed out for the case of the pygmy dipole resonance (PDR). This allows us to distinguish between PQR-type and multiphonon excitations and, consequently, supports the recent first experimental indications of a PQR in 124Sn.
MetadatenVerfasserangaben: | Mark-Christoph SpiekerORCiDGND, Nadja Tsoneva, Vera DeryaGND, Janis EndresGND, Deniz SavranORCiDGND, Muhsin N. HarakehORCiD, Sotirios Harissopulos, Rolf-Dietmar HerzbergORCiDGND, Anastasios Lagoyannis, Horst LenskeORCiD, Norbert PietrallaORCiDGND, Lucia Popescu, Marcus ScheckORCiDGND, Friederike Schlüter, Kerstin SonnabendGND, Victor Ionuț StoicaGND, Heinrich WörtcheGND, Andreas ZilgesORCiDGND |
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URN: | urn:nbn:de:hebis:30:3-546810 |
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DOI: | https://doi.org/10.1016/j.physletb.2015.11.004 |
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ISSN: | 1873-2445 |
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ISSN: | 0370-2693 |
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Titel des übergeordneten Werkes (Englisch): | Physics Letters B |
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Verlag: | Elsevier |
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Verlagsort: | Amsterdam |
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Dokumentart: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Datum der Veröffentlichung (online): | 10.11.2015 |
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Datum der Erstveröffentlichung: | 10.11.2015 |
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Veröffentlichende Institution: | Universitätsbibliothek Johann Christian Senckenberg |
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Datum der Freischaltung: | 16.05.2020 |
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Freies Schlagwort / Tag: | 124Sn; Atomic nuclei; Collective quadrupole excitations; Pygmy quadrupole resonance |
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Jahrgang: | 752.2016 |
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Seitenzahl: | 6102107 |
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HeBIS-PPN: | 465584659 |
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Institute: | Physik / Physik |
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DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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Sammlungen: | Universitätspublikationen |
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Lizenz (Deutsch): | Creative Commons - Namensnennung 4.0 |
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