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Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 31: Structure and Dynamics of Nuclei IV

HK 31.7: Talk

Wednesday, March 29, 2017, 18:15–18:30, F 2

Lifetime measurements in neutron-rich Mn isotopes — •Thomas Braunroth1, Alfred Dewald1, Christoph Fransen1, Hironori Iwasaki2, and Jan Jolie11Institut für Kernphysik, Universität zu Köln, Germany — 2National Superconducting Cyclotron Laboratory, MSU, USA

The observation of a sudden increase in collective behavior along neutron-rich even-even chromium and iron isotopes toward N=40 triggered several studies in recent years. Within the shell-model this sudden increase can only be reproduced by choosing an expanded valence space which allows excitations beyond N=40 and into the g9/2 and d5/2 orbitals [1].

Less attention has been spent on neighboring odd-mass manganese isotopes with Z=25, although they are able to provide complementary sensitivity to state-of-the-art (shell model) interactions. Within this talk we will present lifetimes of low-lying excited states in 59,61,63Mn, which were deduced from a recoil distance Doppler-shift measurement. These isotopes were produced in side reactions of an experiment whose central aim was the determination of level-lifetimes in 58,60,62Cr [2].

This work is supported by the BMBF under contract number 05P15PKFNA.

[1] S. M. Lenzi et al., Phys. Rev. C 82, 054301 (2010).

[2] T. Braunroth et al., Phys. Rev. C 92, 034306 (2015).

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