Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 43: Struktur und Dynamik von Kernen
HK 43.3: Vortrag
Donnerstag, 22. März 2012, 17:15–17:30, P 4
Coulomb excitation of 140Nd - measuring the B(E2) value of the first 2+ state at REX-ISOLDE * — •Christopher Bauer1, Georgi Rainovski2, Norbert Pietralla1, Andrey Blazhev3, Timo Bloch1, Sabine Bönig1, Antoaneta Damyanova2, Miroslav Danchev2, Kalin Gladnishki2, Thorsten Kröll1, Jörg Leske1, Kevin Moschner3, Janne Pakarinen4, Marcus Scheck1, Christian Stahl1, Robert Stegmann1, and Volker Werner5 — 1IKP, TU Darmstadt, Germany — 2University of Sofia, Bulgaria — 3IKP, Universität zu Köln, Germany — 4CERN, Geneve, Switzerland — 5WNSL, Yale University, New Haven, United States
A radioactive beam of 140Nd was impinging on a 1.40mg/cm2 48Ti as well as a 1.55mg/cm2 64Zn target. Gamma rays were detected by the MINIBALL array and a DSSD was used for particle identification. The transition strength of the first 2+ state to the 0+ ground state of neutron-deficient 140Nd was measured to be 30(5) W.u. This result deviates from empirical rules for quadrupole collectivity and microscopic predictions (Quasiparticle-phonon model for N=80 predicts 17 W.u. with parameters from [1]). This unexpected behavior prompts for new, refined microscopic calculations and might be related to the shell stabilization of the quadrupole isovector valence shell excitations. The result is important for the planned experiment at HIE-ISOLDE, which aims to identify the one-phonon mixed-symmetry 2+ state of 140Nd.
[1] N. Lo Iudice, Ch. Stoyanov, D. Tarpanov, Phys. Rev. C77 (2008)
* supported by the State of Hesse within HIC for FAIR, BMBF (06DA9041I), EU (ENSAR) and the DAAD