lifetime measurements in n=z 72 kr
DESCRIPTION
International Conference on Finite Fermionic Systems ― Nilsson Model 50 Years June 14-18, 2005, Lund, Sweden. Lifetime Measurements in N=Z 72 Kr. Corina Andreoiu. Outline. Motivation Experimental set-up Results & Discussions Conclusions. 4. Delayed Alignments?. 2. - PowerPoint PPT PresentationTRANSCRIPT
Lifetime Measurements in Lifetime Measurements in N=ZN=Z 7272KrKrLifetime Measurements in Lifetime Measurements in N=ZN=Z 7272KrKr
International Conference on Finite Fermionic Systems ― Nilsson Model 50 YearsJune 14-18, 2005, Lund, Sweden
OutlineOutline
Motivation
Experimental set-up
Results & Discussions
Conclusions
Delayed Alignments?Delayed Alignments?
G. de Angelis et al. Phys. Rev. Lett. B 415, 217 (1997)S. Fischer et al. Phys. Rev. Lett. 87, 132501 (2001)N. Kelsall et al. Phys. Rev. C 64, 024309 (2001)
24
400(150) fsQt = 2.52(47) eb
β = 0.37
61(16) fsQt = 1.15(15) eb
π(g9/2)2 x ν(g9/2)2
14(5) fs
1
Band 2-4: Δτ = 50 fs
4
Alignments in Alignments in 72,74,7672,74,76KrKr
ħω (MeV)
i x(ħ
)
Theoretical StudiesTheoretical StudiesKinetic Moments of InertiaKinetic Moments of Inertia
CRHB + LN, Gogny D1S (T = 1) Pairing
A.V. Afanasjev, S. Frauendorf, Phys. Rev. C, (2005) in press
pairingno pairing
Neutron Single Particle LevelsNeutron Single Particle Levels
Labelled: number of protons in g9/2 orbitalnumber of neutrons in g9/2 orbital
[p,n]
β2/β4
e ν (M
eV)
W. Nazarewicz et al. Nucl. Phys. A345, 397(1985)
ConfigurationsConfigurations
A.V. Afanasjev, S. Frauendorf, Phys. Rev. C, (2005) in press
band 2band 4
Transitional Quadrupole Moment and DeformationTransitional Quadrupole Moment and Deformation
A.V. Afanasjev, S. Frauendorf, Phys. Rev. C, (2005) in press
[2,2]
[3,3]b[3,3]a
CRHB + LN
CRMF
Z=Z=36 Kr Nuclei36 Kr Nuclei
N
N=ZZ
36
72 74 7573 76
37
Se
38 39 40
36
37
35
3470 71 72
73
73 74
74 757271
777675
7776 78
78 79
80
74
70
6968
3534
Kr
Br
Zr
38
39
40
Y
Sr
Ru
2
CN
Argonne National Laboratory, Chicago, USA
40Ca + 40Ca → 80Zr → 72Kr + 2α
Beam: 40Ca @ 164 MeV
Target: 350 μg/cm2 40Ca 150 μg/cm2 197Au
MicroballMicroball
95 CsI(Tl) scintilators
9 rings
• Identification of charged particles Channel selection
• Energy, momentum and angle of the charged particles Event by event kinematic reconstruction
D.G. Sarantites et al. NIM A381,418 (1996)
GammasphereGammasphere
• 110 HP Ge detectors, Compton Suppressed, 17 rings
• gamma ray multiplicity
• sum energy measurements
• total energy conservation selection
Gammasphere detector angles + kinematics of reaction (Microball)
Doppler correction of γ rays
MICROBALL
40Ca
I.Y. Lee, Nucl. Phys. A520, 641c, (1991)
High Spin States in High Spin States in 7272KrKr 30+
28+ Jtop + 4
24
Side Band
2α TEP - Band
ConfigurationsConfigurations
A.V. Afanasjev, S. Frauendorf, Phys. Rev. C, (2005) in press
band 2band 4
Low-Spin (Preliminary)Low-Spin (Preliminary)
Recoil out of target
Low spin
Band 2
Band 2 – High SpinBand 2 – High Spin
Band 4Band 4
Experiment & TheoryExperiment & Theory
[2,2]
[3,3]b[3,3]a
CRHB + LN
CRMF
ConclusionsConclusions
Extended the level scheme of N=Z 72Kr up to 30ħ Lifetime measurements at high spins in 72Kr using the DSAM Good agreement with theory with only T=1 (Gogny DS1) pairing
Future WorkFuture Work
Measure lifetimes of lower spin states using backed target data
AcknowledgmentsAcknowledgments
University of Guelph
P. Finlay
P.E. Garrett
G.F. Grinyer
B. Hyland
A.A. Phillips
M.A. Schumaker
C.E. Svensson
J.J. Valiente-Dobon
McMaster University
R.A.E Austin
Argonne
National Laboratory
M.P. Carpenter
S.J. Freeman
F. Moore
D. Seweryniak
NSCU
D. Dashdorj
CEA Saclay
A. Goergen
York University
D. Jenkins
F. Johnston-Theasby
P. Joshi
R. Wadsworth
Washington University
W. Reviol
D.G. Sarantites
Lawrence Berkeley National Laboratory
A.O. Macchiavelli
D.D. Ward
TRIUMF
M.B. Smith
Tack sTack så mycket!å mycket!
The Swedish Foundation for International Cooperation The Swedish Foundation for International Cooperation in Research and Higher Educationin Research and Higher Education
Lund UniversityLund University
Side BandSide Band
Recoil out of target