Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Structure and Dynamics of Nuclei IX
HK 48.7: Talk
Thursday, March 1, 2018, 15:30–15:45, HZO 70
Lifetime measurements in neutron-rich Mn isotopes — •Thomas Braunroth1, Alfred Dewald1, Christoph Fransen1, Hironori Iwasaki2, Jan Jolie1, and Silvia M. Lenzi3 — 1Institut für Kernphysik, Universität zu Köln, Germany — 2National Superconducting Cyclotron Laboratory, MSU, USA — 3Dipartimento di Fisica e Astronomia, Universitá di Padova, Italy
The sudden increase in collective behavior along neutron-rich even-even chromium and iron isotopes toward N=40 triggered several studies in recent years.
Large-scale shell-model calculations can reproduce this trend, which demonstrates the crucial role of neutron scattering into the g9/2 and d5/2 orbitals [1] in this region.
Less attention has been spent on neighbouring 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 new data on level lifetimes of low-lying excited states in 59,61,63Mn, which were deduced from a recoil distance Doppler-shift measurement with fast radioactive beams.
These isotopes were produced in side reactions of an experiment whose central aim was the determination of level-lifetimes in 58,60,62Cr [2].
The present results are discussed within the shell-model framework using the established fp interaction KB3G as well as the modern interaction LNPS-m and indicate a phase transition close to N=36.
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).