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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
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
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
Pro
ton
(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
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)
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
Test the IMME in pf Shell
N=Z
f7/2
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
Injection ToF
v
v
qm
qm
T
T
tt
2
2
21
1
ref
reft BBd
CdC
)()(2
Principle of mass measurement in CSRe
Injection ToF
v
v
qm
qm
T
T
tt
2
2
21
1
Principle of mass measurement in CSRe
Isochronous Mass Spectrometry (IMS mode)
t
DT
Detector
HIRFL−CSR
Injection ToF
v
v
qm
qm
T
T
tt
2
2
21
1
t v
v
t
2
2
1
Mass measurement in CSRe (IMS mode)
Ions Identification
Exp.
Simultion.
P2
Procedure of Data analysis
Signals in Oscilloscope
V-4
3
Mn
-47
Fe-
49
Ni-
53
C
u-5
5
58Ni beam: Revolution Time Spectrum
58Ni beam: Revolution Time Spectrum
Sum of 760 sub-spectra, each of which includes spills
34Ar, 51Co: same m/q
Ion-amplitude identification: 51Co
2
1( )
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)
Tz=-1
/2, (
78 Kr B
eam
)
Tz= -1
, -3/
2, (
58 Ni Bea
m)
3. Results and Discussion
Mass excesses for the nuclides of interest (58Ni beam)
N=Z
?
?
?
?
Test the IMME in fp shell nuclei
M(A,T,T3)=a(A,T)+b(A,T)T3+c(A,T) T32 + d(A,T)T3
3
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
Shell model calculations
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.
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.
Thank you for your attention and welcome you to visit IMP, Lanzhou