The 11 th Inter. Conf. on nucleus-Nucleus Collision, San Antonio Texas, May 27- June 1
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Transcript of The 11 th Inter. Conf. on nucleus-Nucleus Collision, San Antonio Texas, May 27- June 1
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The 11th Inter. Conf. on nucleus-Nucleus Collision, San Antonio Texas, May 27- June 1
Yu-Hu ZhangInstitute of Modern Physics, Chinese Academy of Sciences
Lanzhou, China
May 30. 2012, San Antonio Texas, USA
Test of IMME in fp shell via direct mass measurements of TZ = -3/2 nuclides
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1. Introduction2. Mass measurements in CSRe3. Results & Discussion4. Conclusions
Outline
The 11th Inter. Conf. on nucleus-Nucleus Collision, San Antonio Texas, May 27- June 1
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1. IntroductionWhat is IMME ? (Isobaric Multiplet Mass Equation)
N = Z
T=3/2 quartet
- 3/2
g.s
- 1/2
IAS
+ 1/2
IAS
+ 3/2
g.s
Neutron
Prot
on
(A,T,J)
Degenerate if nocharge-dependentInteraction, and nH
corrected for.
- 3/2 - 1/2 + 1/2 + 3/2
Charge-dependenteffects
M(A,T,T3)=a(A,T)+b(A,T)T3+c(A,T)T32
Any charge-dependent effects are two body interactions and be regarded as a perturbation.
+ d(A,T)T33 or
+ e(A,T)T34
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33
2333 ),(),(),(),,(),,( TATdTATcTATbATaTATM
Test the IMME: the case of A=33,T=3/2
Breakdown of the Isobaric Multiplet Mass Equation at A= 33, T=3/2F. Herfurth, PhysRevLett.87.142501(2001)
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Breakdown of the Isobaric Multiplet Mass Equation at A= 33, T=3/2F. Herfurth,1,3,* J. Dilling,1 A. Kellerbauer,2,5 G. Audi,4 D. Beck,6,1 G. Bollen,3,8 H.-J. Kluge,1 D. Lunney,4DOI: 10.1103/PhysRevLett.87.142501(2001)
Revalidation of the Isobaric Multiplet Mass EquationM. C. Pyle,1 A. García,1 E. Tatar,1 J. Cox,1 B. K. Nayak,1 S. Triambak,1 B. Laughman,1 A. Komives,1 L. O. Lamm,1DOI: 10.1103/PhysRevLett.88.122501 (2002)
Masses of 32Ar and 33Ar for Fundamental TestsK. Blaum,1,2,* G. Audi,3 D. Beck,2 G. Bollen,4 F. Herfurth,1 A. Kellerbauer,1 H.-J. PhysRevLett.91.260801 (2003)
PHYSICAL REVIEW C 73, 054313 (2006)Mass of the lowest T = 2 state in 32S: A test of the isobaric multiplet mass equationS.Triambak, A.Garcia, E.G.Adelberger, G.J.P.Hodges, D.Melconian, H.E.Swanson, S.A.Hoedl, S.K.L.Sjue, A.L.Sallaska, H.Iwamoto S.Triambak, A.Garcia, E.G.Adelberger, G.J.P.Hodges, D.Melconian, H.E.Swanson, S.A.Hoedl, S.K.L.Sjue, A.L.Sallaska, H.Iwamoto
Related publications
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Test the IMME in pf Shell
N=Z
f7/2
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CSRe
SFC (K=69)10 AMeV (H.I.), 17~35 MeV (p)
SSC(K=450) 100 AMeV (H.I.), 110 MeV (p)
CSRm 1000 AMeV (H.I.), 2.8 GeV (p)
RIBLL1RIBs at tens of AMeV
RIBLL2RIBs at hundreds of AMeV
HIRFL 能够提供不同能量、种类众多的稳定核束流和放射性核束流
2. Mass measurements in CSRe
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Injection ToF
v
vqmqm
TT
tt
2
2
2 11
ref
reft BBd
CdC)()(
2
Principle of mass measurement in CSRe
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Injection ToF
v
vqmqm
TT
tt
2
2
2 11
Principle of mass measurement in CSRe
Isochronous Mass Spectrometry (IMS mode)
t
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DT
Detector
HIRFL−CSR
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Injection ToF
v
vqmqm
TT
tt
2
2
2 11
t vv
t
2
2
1
Mass measurement in CSRe (IMS mode)
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Ions Identification
Exp.
Simultion.
P2
Procedure of Data analysis
Signals in Oscilloscope
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V-43
Mn-
47
Fe
-49
N
i-53
C
u-55
58Ni beam: Revolution Time Spectrum
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58Ni beam: Revolution Time SpectrumSum of 760 sub-spectra, each of which includes spills
34Ar, 51Co: same m/q
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Ion-amplitude identification: 51Co
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21( )
1
n
iT T
STDEVn
Nuclides for Calibration:
Nuclides used for M/Q calibration are within a time window which is not far
from the isochronous condition.
M/q = a + b T +c T 2 + d T 3
Xn =1.18
Mass excesses for the nuclides of interest (58Ni beam)
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Tz=-1/
2, ( 7
8 Kr Bea
m)
Tz= -1
, -3/2,
( 58 Ni B
eam)
3. Results and Discussion
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Mass excesses for the nuclides of interest (58Ni beam)
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N=Z
?
?
?
?
Test the IMME in fp shell nucleiM(A,T,T3)=a(A,T)+b(A,T)T3+c(A,T) T3
2 + d(A,T)T33
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33
2333 ),(),(),(),,(),,( TATdTATcTATbATaTATM
d coeficients increase gradually up to A=53 for which d is 3.5 deviated from zero.
Test the IMME in fp shell nuclei
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Shell model calculations
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53Mn gs 53Ni gs 53Fe IAS 53Co IAS
Mass Excesses uncertainty: 0.6 keV 25 keV 3. 4 keV 19 keV
More attention should be paid to the excitation Energies of IAS’s in 53Co & 53Fe since the errorsare three times as important as those of the g.s masses of 53N and 53Mn for an evaluation of d &in checking the validity of the IMME.
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4. Conclusions
1) CSRe IMS + interpolation Masses of T3= -3/2 nuclei measured.
2) Breakdown of quadratic form of IMME found for A=53, T=3/2 quartet
3) More precise mass measurements of (53Ni; gs) and (53Co; IAS) are needed in order to check the validity of IMME in the pf shell.
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