München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 25: Theorie

HK 25.6: Vortrag

Dienstag, 21. März 2006, 18:15–18:30, B

Gamow-Teller and M1 strengths in sd-pf and pf-g cross-shell regions — •Alexander Lisetskiy^1,2, Karlheinz Langanke¹, Gabriel Martinez-Pinedo¹, and Alex Brown² — ¹GSI, Planckstr. 1, Darmstadt, 64291, Germany — ²NSCL, Michigan State University, 1 Cyclotron Laboratory, East Lansing, 48824, MI, USA

Neutron-rich nickel isotopes in the vicinity of ₂₈⁷⁸Ni₅₀ and and argon isotopes with A=38-44 are currently in the focus of modern nuclear physics and astrophysics studies. The interest in these regions is motivated by the doubly magic nature of ₂₈⁷⁸Ni, ₂₀⁴⁰Ca and ₂₀⁴⁸Ca nuclei, understanding the way in which the neutron excess will affect the properties of nearby nuclei and nucleon-nucleon interaction and cross-shell N and N+1 effects. The astrophysical importance is related to the understanding of the nuclear mechanism of the rapid capture of neutrons by seed nuclei through the r-process and electron capture on nuclei for nickel an argon isotopes, respectively. In present contribution we discuss effects of f_7/2 orbital on beta-decay properties of nickel isotopes by breaking the ⁵⁶Ni core and mixing effects of sd and pf shell configurations on M1 strength distribution for argon isotopes.