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Discovery and Cross-Section Measurement of Neutron-Rich Isotopes in the Element Range from Neodymium to Platinum at the FRS | | J. Kurcewicz
; F. Farinon
; H. Geissel
; S. Pietri
; C. Nociforo
; A. Prochazka
; H. Weick
; J.S. Winfield
; A. Estradé
; P.R.P. Allegro
; A. Bail
; G. Bélier
; J. Benlliure
; G. Benzoni
; M. Bunce
; M. Bowry
; R. Caballero-Folch
; I.Dillmann
; A. Evdokimov
; J.Gerl
; A. Gottardo
; E. Gregor
; R. Janik
; A. Kelić-Heil
; R. Knöbel
; T. Kubo
; Yu. A. Litvinov
; E. Merchan
; I. Mukha
; F. Naqvi
; B. Pfeiffer
; M. Pfützner
; M. Pomorski
; Zs. Podolyák
; P.H. Regan
; B. Riese
; M.V. Ricciardi
; C. Scheidenberger
; B. Sitar
; P. Spiller
; J. Stadlmann
; P. Strmen
; B. Sun
; I. Szarka
; J. Taïeb
; S. Terashima
; J.J. Valiente-Dobón
; M. Winkler
; Ph. Woods
; | | Date: |
2 Dec 2011 | | Abstract: | With a new detector setup and the high-resolution performance of the fragment
separator FRS at GSI we discovered 57 new isotopes in the atomic number range
of 60$leq Z leq 78$:
uc{159-161}{Nb},
uc{160-163}{Pm},
uc{163-166}Sm,
uc{167-168}{Eu},
uc{167-171}{Gd},
uc{169-171}{Tb},
uc{171-174}{Dy},
uc{173-176}{Ho},
uc{176-178}{Er},
uc{178-181}{Tm},
uc{183-185}{Yb},
uc{187-188}{Lu},
uc{191}{Hf},
uc{193-194}{Ta},
uc{196-197}{W},
uc{199-200}{Re},
uc{201-203}{Os},
uc{204-205}{Ir} and
uc{206-209}{Pt}.
The new isotopes have been unambiguously identified in reactions with a
$^{238}$U beam impinging on a Be target at 1 GeV/u. The isotopic production
cross-section for the new isotopes have been measured and compared with
predictions of different model calculations. In general, the ABRABLA and COFRA
models agree better than a factor of two with the new data, whereas the
semiempirical EPAX model deviates much more. Projectile fragmentation is the
dominant reaction creating the new isotopes, whereas fission contributes
significantly only up to about the element holmium. | | Source: | arXiv, 1112.0521 | | Services: | Forum | Review | PDF | Favorites | |
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