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

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

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Publication date

January 2009

DOI

10.1016/j.physletb.2009.01.007

Publisher

Elsevier BV

Abstract

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 mag...