Lars Ghys 12 1 Instituut voor Kern en Stralingsfysica KU Leuven Celestijnenlaan 200D B3001 Leuven 2 Belgian Nuclear Research Centre SCKCEN Mol Belgium ARIS conference June 16 Tokyo Japan ID: 309942
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Slide1
-delayed fission of neutron-deficient Fr and At isotopesLars Ghys1,2 1Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven2 Belgian Nuclear Research Centre, SCK•CEN, Mol, Belgium
ARIS conference June 1-6, Tokyo (Japan)Slide2
Low-energy fission throughout the nuclear chart A.N. Andreyev , M. Huyse
and P. Van Duppen,
Rev
. Mod. Phys. 85
, 1541 (2013)
asymmetry
transition
symmetry
asymmetry
???
Introduction
set up
results
conclusion
2Slide3
- delayed fission (DF)
Q
B
f
DF
decay
excitation energy < Q value
Spin/ parity sensitivity
fission
U and
Pb
region
(
isospin
dependence)
Mass/ energy distributions
df
probability and half life
Q
β
Introduction
setup
results
conclusion
3Slide4
1.4 GeV protons
HRS mass
separator
GPS mass
separator
GPS target
Windmill
position
HRS target
ISOLDE
facility
- CERN
S.Rothe
et
al./ Nature
Comm
4 (2013) 1835
2 µA of
protons
on
UC
x
target
isotopic
(
isomeric
) pure
beam
beam
energy
of 30-60
keV
Introduction
setup
results
conclusion
4Slide5
Experimental set-up: “Windmill system”Si spectrume
-/e+
particles
-
summing
Fission
fragments
Introduction
setup
results
conclusion
5
Si front
Si back
C
foil
ISOLDE beam
FFSlide6
~2 FF/h2 isomers~8 FF/h~43 FF/h2 isomers~27 FF/hReference
Introduction
setup
results conclusion6Slide7
Fission at low excitation energies: systematics
A.N.
Andreyev
, M.
Huyse
and P. Van
Duppen,
Rev
.
Mod
.
Phys
.
85
, 1541 (2013)Introduction set-up results
conclusion
7Slide8
Finite Range Liquid Drop Model (P. Möller & J. Randrup, PRC 064606)Introduction setup results conclusion
8
Experimental
triple-humped vs calculated
double-humped transitionSlide9
HFB theory with Gogny D1S nuclear force (M. Warda et al., PRC 024601)Broad and flat plateau in potential- energy surfaceIntroduction setup
results conclusion
9Slide10
Conclusions & outlookConclusions df of 200,202Fr and 194,196At confirmed and studied at ISOLDETriple- humped mass distributionsComparison with
theoretical
calculations (P.
Möller et al., M. Warda et al.)systematic
comparison of T
df
OutlookSeparation
of isomers in
202
Fr (CRIS) and
194
At (RILIS)
detailed
α- decay spectroscopy on investigated
isotopes
Introduction set-up results conclusion10Slide11
Thank you!A.N. AndreyevD. JenkinsV. TruesdaleX. DerkxJ. Lane
V. Liberati
H. de Witte
J. Elseviers
L. Ghys
S. SelsM. Huyse
D. Radulov
M.
Rajabali
C. Van Beveren
P. Van den Bergh
P. Van
Duppen
T. E.
CocoliosE. Rapisarda
ISOLDE & RILIS
L. GhysL. PopescuD. Pauwels
Comenius University, BratislavaB. Andel
S. AntalicZ.
Kalaninova
K. Nishio, Y. Nagame
, JAEA, Tokai, JapanF.P. Hessberger, SHIP (GSI), Darmstadt, Germany
U. Koster, ILL, Grenoble, FranceR. Page, OLL, University of LiverpoolP. Möller
,
Los
Alamos
National
Laboratory
, US
M.
Warda
, M.
Curie-Sklodowskiej
,
Poland
11