teresa kurtukian-nieto centre d’etudes nucléaires de bordeaux gradignan precision half-life...
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Teresa Kurtukian-Nieto
Centre d’Etudes Nucléaires de Bordeaux Gradignan
Precision half-life determination of the
superallowed 0+ →0+ β+-emmiters 42Ti,38Ca,30S
and the mirror β transitions of 39Ca, 31S and 29P
Workshop of ESNT: Isospin symmetry and its breaking in nuclear structure
CEA/SPhN-Saclay, April 29th 2011
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Teresa Kurtukian Nieto, CENBG April 29th 2011 2CEA/SPhN Workshop of the ESNT
Experimental ft measurements
T1/2
QEC
BR
0+
0+
Precision measurements required:
QEC → mass measurements: f ~ Q5
T1/2, BR → -decay studies: t = T1/2 / BR
to test Ft value required relative precision ~10-3
22 2
1
1 /1 a vv F R f f
ktg M
F
Mirror Transitions T=1/2
22
1
1v F R
ktg M
F
Super Allowed Fermi 0+ → 0+
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Teresa Kurtukian Nieto, CENBG April 29th 2011 3CEA/SPhN Workshop of the ESNT
• typical setup:
- beam purification system: traps
- beta detector
- gamma detectors
Half-life measurements:Experimental details
JYFL – IGISOL
ISOLDE / CERN
JYFL – IGISOL
ISOLDE / CERN
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Teresa Kurtukian Nieto, CENBG April 29th 2011 4CEA/SPhN Workshop of the ESNT
JYFLTRAP
detector
Gedetectors
Tapetransportsystem
Typical setup: JYFL – IGISOL
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Teresa Kurtukian Nieto, CENBG April 29th 2011 5CEA/SPhN Workshop of the ESNT
detection setup- plastic scintillator- germanium
tape transport system
Typical setup: JYFL – IGISOL
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Teresa Kurtukian Nieto, CENBG April 29th 2011 6CEA/SPhN Workshop of the ESNT
Typical setup: ISOLDE / CERN
radioactiveions
detection- gas counter- germanium
GSI tapesystem
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Teresa Kurtukian Nieto, CENBG April 29th 2011 7CEA/SPhN Workshop of the ESNT
Half-life measurements:Experimental details
measurement principle
cycles- isotope accumulation
- purification - transport
- decay measurement- remaining activity evacuation
measurement principle
cycles- isotope accumulation
- purification - transport
- decay measurement- remaining activity evacuation
• different fixed dead times: 2 s, 8 s, 100s
• different detector high-voltages
• different detection thresholds
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Teresa Kurtukian Nieto, CENBG April 29th 2011 8CEA/SPhN Workshop of the ESNT
•Data analysis:
• cycle selection: no beam, detector sparking…
• half-life cuts: test of dead time correction
• half-life as a function of background, of rate, of detector settings
Is there any dependence of the half-life of these parameters?
error budget
Half-life measurements:Experimental details
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Super Allowed Fermi 0+ → 0+
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Teresa Kurtukian Nieto, CENBG April 29th 2011 10CEA/SPhN Workshop of the ESNT
all nuclei of interest
Experimental quantities:• Q values: traps, high precision “easily” reachable• half-lives: feasible• branching ratios: hard part…
Error budget
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Super Allowed Fermi 0+ → 0+: 42Ti
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Teresa Kurtukian Nieto, CENBG April 29th 2011 12CEA/SPhN Workshop of the ESNT
Beam purification: JYFLTRAP
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Teresa Kurtukian Nieto, CENBG April 29th 2011 13CEA/SPhN Workshop of the ESNT
Typical spectrum: one run
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Teresa Kurtukian Nieto, CENBG April 29th 2011 14CEA/SPhN Workshop of the ESNT
Implantation on the tape?
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Teresa Kurtukian Nieto, CENBG April 29th 2011 15CEA/SPhN Workshop of the ESNT
2s
8s
100s
Dead time correction: part 1
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Teresa Kurtukian Nieto, CENBG April 29th 2011 16CEA/SPhN Workshop of the ESNT
test of dead time correction
Dead time correction: part 2
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Teresa Kurtukian Nieto, CENBG April 29th 2011 17CEA/SPhN Workshop of the ESNT
Different experimental conditions:
thresholds and high-voltages
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Teresa Kurtukian Nieto, CENBG April 29th 2011 18CEA/SPhN Workshop of the ESNT
• counting statistics: 0.45• dead time correction: 0.01• experimental parameters (threshold, HV): 0.00• T1/2 as function of background: 0.00• T1/2 as function of counting rate: 0.00• “wrong” implantation: 0.00--------------------------------------------------------------------Total: 0.45
T1/2(42Ti) = 208.14 ± 0.45 ms
Error budget
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Teresa Kurtukian Nieto, CENBG April 29th 2011 19CEA/SPhN Workshop of the ESNT
T. Kurtukian Nieto et al., PRC80 (2009) 035502
BR = 48.2(15)%
611 keV
Ft = 3114(79)
Half-life of 42Ti:
JYFL 2008
42Ti T1/2 = 208.14 ± 0.45 ms (2.16 ‰)
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Teresa Kurtukian Nieto, CENBG April 29th 2011 20CEA/SPhN Workshop of the ESNT
Half-life of 42Ti:
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Super Allowed Fermi 0+ → 0+: 38Ca
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Teresa Kurtukian Nieto, CENBG April 29th 2011 22CEA/SPhN Workshop of the ESNT
Half-life of 38Ca:
ISOLDE 2007
38Ca T1/2 = 443.8 ± 1.9 ms Blank et al., EPJ A 44,363 (2010)
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Teresa Kurtukian Nieto, CENBG April 29th 2011 23CEA/SPhN Workshop of the ESNT
Half-life of 38Ca:
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Super Allowed Fermi 0+ → 0+: 30S
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Teresa Kurtukian Nieto, CENBG April 29th 2011 25CEA/SPhN Workshop of the ESNT
Half-life measurements : 30S
JYFL 2009
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Teresa Kurtukian Nieto, CENBG April 29th 2011 26CEA/SPhN Workshop of the ESNT
Half-life measurements : 30S
30S T1/2 = 1175.9 ± 1.7 ms (1.45 ‰) Souin, et al., EPJA (2011)
30P (T1/2 = 148.88 ± 0.24 s) as contamination as daughter
need to characterize bothcontributions
- filiation of 30Sno additional parameter
- production (mass separator)background constraintrequired
example ru
n
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Teresa Kurtukian Nieto, CENBG April 29th 2011 27CEA/SPhN Workshop of the ESNT
Half-life measurements : 30S
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Teresa Kurtukian Nieto, CENBG April 29th 2011 28CEA/SPhN Workshop of the ESNT
Error budget
sensitive improvement for half-lives
some difficult work to do for branching ratios
2007
2011
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Mirror decayMirror decay
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Teresa Kurtukian Nieto, CENBG April 29th 2011 30CEA/SPhN Workshop of the ESNT
Mirror decayMirror decay
Measurements required:• -decay Q value• super-allowed branching ratio• -decay half-life• - angular correlation coefficient
N. Severijns, O. Naviliat-Cuncic
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Teresa Kurtukian Nieto, CENBG April 29th 2011 31CEA/SPhN Workshop of the ESNT
Status in 2009
Experimental quantities:
• half-lives: feasible
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Teresa Kurtukian Nieto, CENBG April 29th 2011 32CEA/SPhN Workshop of the ESNT
Mirror transitions: Half-lives of 39Ca
Blank et al., EPJ A 44,363 (2010)
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Teresa Kurtukian Nieto, CENBG April 29th 2011 33CEA/SPhN Workshop of the ESNT
T. Kurtukian Nieto, A. Bacquias et al.
T1/2 = 2546.4(18) ms
Mirror transitions: Half-life of 31S:
JYFL 2009
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Teresa Kurtukian Nieto, CENBG April 29th 2011 34CEA/SPhN Workshop of the ESNT
JYFL 2009
Mirror transitions: Half-life of 29P:
preli
minary
T. Kurtukian Nieto, A. Bacquias et al.
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Teresa Kurtukian Nieto, CENBG April 29th 2011 35CEA/SPhN Workshop of the ESNT
Error budget
2009
2011
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Branching Ratio MeasurementsBranching Ratio Measurements
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• Need to know the efficiency with a precision of 0.1%
• calibration programme of a monocristal detector:
- source measurements - MC simulations
Ge
Capot Al
Detector scheme
J. Souin
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RX of the detector
Scanning done with a collimated 137Cs (CSNSM Orsay)
HPGe
X-Y table 137Cs collimated (477MBq)
J. Souin
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Teresa Kurtukian Nieto, CENBG April 29th 2011 39CEA/SPhN Workshop of the ESNT
Determination of the germanium active volumen
Front cap
Length of the hole (13.6mm larger than
expected)
J. Souin
Scanning done with collimated 137Cs source
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Teresa Kurtukian Nieto, CENBG April 29th 2011 40CEA/SPhN Workshop of the ESNT
Calibration programme at Bordeaux
Gamma sources (with BR know with high precition) done at ISOLDE:
75Se, 27Mg, 24Na, 66Ga, 56Co
133Ba,60Co,207Bi,137Ce,
152Eu,88Y,
85Sr,51Cr,54Mn,57Co
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Teresa Kurtukian Nieto, CENBG April 29th 2011 41CEA/SPhN Workshop of the ESNT
Summary : 0+->0+
2007
2011
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Teresa Kurtukian Nieto, CENBG April 29th 2011 42CEA/SPhN Workshop of the ESNT
Summary Mirror Transitions
2009
2011
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Teresa Kurtukian Nieto, CENBG April 29th 2011 43CEA/SPhN Workshop of the ESNT
The End