Proton-hole excitation in the closed shell nucleus Au-205

Zs. Podolyak, G. F. Farrelly, P. H. Regan, A. B. Garnsworthy, S. J. Steer, M. Gorska, J. Benlliure, E. Casarejos, S. Pietri, J. Gerl, H. J. Wollersheim, R. Kumar, F. Molina, A. Algora, N. Alkhomashi, G. Benzoni, A. Blazhev, P. Boutachkov, A. M. Bruce, L. CaceresI. J. Cullen, A. M. Denis Bacelar, P. Doornenbal, M. E. Estevez, Y. Fujita, W. Gelletly, H. Geissel, H. Grawe, J. Grebosz, Robert Hoischen, I. Kojouharov, S. Lalkovski, Z. Liu, K. H. Maier, C. Mihai, D. Muecher, B. Rubio, H. Schaffner, A. Tamii, S. Tashenov, J. J. Valiente-Dobon, P. M. Walker, P. J. Woods

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The neutron-rich N = 126 nucleus Au-205 has been populated following the relativistic energy projectile fragmentation of E/A = 1 GeV Pb-208, and studied via charged-particle decay spectroscopy. An internal decay with a transition energy of 907(5) keV and a half-life of T-1/2 = 6(2) s has been identified through the observation of the corresponding K and L internal conversion electron lines. The 907 keV energy level corresponds to the pi h(11/2)(-1) proton-hole state and decays both internally into the pi d(3/2)(-1) ground-state and via beta decay into Hg-205. The obtained data provides information on the evolution of single-proton hole energies which are vital inputs of shell model descriptions for nuclei around the Pb-208(82)126 doubly magic core. (C) 2009 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)116-119
JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number2
Publication statusPublished - 2009

Subject classification (UKÄ)

  • Subatomic Physics


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