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Experimental approach: B(E2) via gamma-particle coincidences (+ RDDS)

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Experimental approach: B(E2) via gamma-particle coincidences (+ RDDS)

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  1. LOI for the AGATA-PRESPEC campaign, GSI Spectroscopy and B(E2) measurements in neutron rich Mo nuclei:Search for shape transitions near the astrophysical r-process pathT. Bäck, B. Cederwall, F. Ghazi Moradi, A. Atac, J. Blomqvist, A. Dewald, E. Ganiouglu, J. Gerl, M. Gorska, E. Ideguchi, A. Johnson A. Khaplanov, P. Magierski,O. Möller,J. Nyberg, S. Pietri, M. Sandzelius, P.-A. Söderström, H.-J. Wollersheim, R. Wyss et al.(author list to be completed) Mean field calculatations of quadrupole deformations (e.g. Möller et al.) predict a prolate-oblate shape transformation in neutron rich Mo isotopes. Good testing ground for nuclear models Experimental approach: B(E2) via gamma-particlecoincidences (+ RDDS)

  2. Astrophysical r-process path 112Mo http://www.cenbg.in2p3.fr/heberge/desir/IMG/gif/tas_1.gif

  3. Predicted shape transitions in heavy Mo isotopes (TRS) 112Mo 108Mo F. R. XU, P. M. WALKER, AND R. WYSS PHYSICAL REVIEW C 65 021303~R

  4. E(2+) and B(E2) systematics

  5. Exp. Data om heavy Mo isotopes up to 110Mo from spontaneous fission of 248Cm and 252Cf. But yield decreases “exponentially” as a function of neutron number. Ding et al., Chinese Phys. Lett. 24 1517 (2007) W. Urban et al., EPJ A20 381 (2004)

  6. Coulex of gamma-vibrational states

  7. Rate estimation for n-rich Mo isotopesproduced in fast fission of 238U Production and transmission calculation using LISE++ Gamma efficiency: 15% (very conservative at 200 keV)Primary 238U Beam: 4·109 particles per second 0.55 g/cm2 Be primary target 0.8 g/cm2 Pb secondary target KE of Mo ions 100 – 130 MeV/u at sec tgt“a” and “b” indicate two different FRS settings optimized for 108Mo and 112Mo, respectively.

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