EURONS Town Meeting 2008
September 17 - 19, 2008 -
Information

Title:	Mr.
Family Name:	Sandzelius
First Name:	Mikael
Gender:	male
E-Mail:	sandzeliusnuclear.kth.se
Affiliation for Badge:	KTH and JYFL
Institute:	Royal Institute of Technology (KTH) and JYFL
Address (Street):	Roslagstullsbacken 21
Postal Code, City:	S-109 61 STOCKHOLM
Country:	Sweden
Phone:	+46855378199
Fax:
Young researcher with contribution:	Yes
Arrival Date:	September 16
Departure Date:	September 20
Author(s):	M. Sandzelius(1,3), B. Hadinia(1), B. Cederwall(1), K. Andgren(1), E. Ganioğlu(1), I.G. Darby(3), M.R. Dimmock(2), S. Eeckhaudt(3), T. Grahn(3), P. Greenlees(3), E. Ideguchi(4), P.M. Jones(3), D. T. Joss (2), R. Julin(3), S. Juutinen(3), A. Khaplanov(1), M. Leino(3), L. Nelson(2), M. Niikura(4), M. Nyman(3), R.D. Page(2), J. Pakarinen(3), E.S. Paul(2), M. Petri(2), P. Rahkila(3), J. Sarén(3),
Institute(s):	1) Department of Physics, Royal Institute of Technology, S-10691 Stockholm, Sweden 2) Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK 3) Department of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, Finland 4) Center for Nuclear Study. Univ. of Tokyo, Wako Saitama 351-0198, Japan 5) Department of Physics, Univ. of York, Heslington, York Y010 5DD, UK
Title:	Evidence for Enhanced Collectivity in the 100Sn Region Near the Z=N=50 Double Shell Closure
Abstract:	Gamma-ray transitions have been identified for the first time in the extremely neutron-deficient Tz=1 nuclide 110Xe and the energies of the three lowest excited states in the ground-state band have been deduced. A level scheme has also been constructed for the proton-unbound, Tz=3/2 nuclide 109I, exhibiting band struc- tures built on g7/2 and h11/2 states in a weakly deformed, triaxial nucleus. In addition, a third band is proposed to be built on a g7/2 orbital coupled to an octupole-vibrational phonon of the 108Te core. The results were obtained in a recoil-decay tagging experiment using the 58Ni(54Fe,2n/p2n) reaction at a beam energy of 195 MeV. The 2n fusion-evaporation channel leading to 110Xe had a cross-section of σ ≈ 50 nb. The experiment was performed using the highly efficient JUROGAM γ -ray spectrometer in conjunction with the RITU gas-filled recoil separator and the GREAT focal-plane spectrometer. The results on 110Xe establish a breaking of the normal trend of increasing first excited 2+ and 4+ level energies as a function of decreasing neutron number as the N=50 major shell gap is approached for the neutron-deficient Xe isotopes. This unusual feature is suggested to be an effect of enhanced collectivity, possibly arising from isoscalar n-p interactions becoming increasingly important close to the N=Z line. Features in the low-lying levels of 106Te and 109I, showing similar trends, are also discussed. Activity: "Gammapool Network" and "TNA04-JYFL"

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