The 11 th Inter. Conf. on nucleus-Nucleus Collision, San Antonio Texas, May 27- June 1 Yu-Hu Zhang Institute of Modern Physics, Chinese Academy of Sciences.

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Presentation transcript:

The 11 th Inter. Conf. on nucleus-Nucleus Collision, San Antonio Texas, May 27- June 1 Yu-Hu Zhang Institute of Modern Physics, Chinese Academy of Sciences Lanzhou, China May , San Antonio Texas, USA Test of IMME in fp shell via direct mass measurements of T Z = -3/2 nuclides

1. Introduction 2. Mass measurements in CSRe 3. Results & Discussion 4. Conclusions Outline The 11 th Inter. Conf. on nucleus-Nucleus Collision, San Antonio Texas, May 27- June 1

1. Introduction What 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 Proton (A,T,J  ) Degenerate if no charge-dependent Interaction, and  nH corrected for. - 3/2 - 1/2 + 1/2 + 3/2 Charge-dependent effects M(A,T,T 3 )=a(A,T)+b(A,T)T 3 +c(A,T)T 3 2 Any charge-dependent effects are two body interactions and be regarded as a perturbation. + d(A,T)T 3 3 or + e(A,T)T 3 4

Test the IMME: the case of A=33,T=3/2 Breakdown of the Isobaric Multiplet Mass Equation at A= 33, T=3/2 F. Herfurth, PhysRevLett (2001)

Breakdown of the Isobaric Multiplet Mass Equation at A= 33, T=3/2 F. 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,4 DOI: /PhysRevLett (2001) Revalidation of the Isobaric Multiplet Mass Equation M. 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,1 DOI: /PhysRevLett (2002) Masses of 32Ar and 33Ar for Fundamental Tests K. Blaum,1,2,* G. Audi,3 D. Beck,2 G. Bollen,4 F. Herfurth,1 A. Kellerbauer,1 H.-J. PhysRevLett (2003) PHYSICAL REVIEW C 73, (2006) Mass of the lowest T = 2 state in 32S: A test of the isobaric multiplet mass equation S.TriambakS.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 A.GarciaE.G.AdelbergerG.J.P.HodgesD.MelconianH.E.Swanson S.A.HoedlS.K.L.SjueA.L.SallaskaH.IwamotoS.TriambakA.Garcia E.G.AdelbergerG.J.P.HodgesD.MelconianH.E.SwansonS.A.HoedlS.K.L.Sjue A.L.SallaskaH.Iwamoto Related publications

Test the IMME in pf Shell N=Z f 7/2

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) RIBLL1 RIBs at tens of AMeV RIBLL2 RIBs 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 Principle of mass measurement in CSRe

Injection ToF Principle of mass measurement in CSRe Isochronous Mass Spectrometry (IMS mode)

DT Detector HIRFL−CSR

Injection ToF Mass measurement in CSRe (IMS mode)

Ions Identification Exp. Simultion. P2 Procedure of Data analysis Signals in Oscilloscope

V-43 Mn-47 Fe-49 Ni-53 Cu Ni beam: Revolution Time Spectrum

Sum of 760 sub-spectra, each of which includes  spills 34 Ar, 51 Co: same m/q

Ion-amplitude identification: 51 Co

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 X n =1.18 Mass excesses for the nuclides of interest ( 58 Ni beam)

Tz=-1/2, ( 78 Kr Beam) Tz= -1, -3/2, ( 58 Ni Beam) 3. Results and Discussion

Mass excesses for the nuclides of interest ( 58 Ni beam)

N=Z ? ? ? ? Test the IMME in fp shell nuclei M(A,T,T 3 )=a(A,T)+b(A,T)T 3 +c(A,T) T d(A,T)T 3 3

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

53 Mn gs 53 Ni gs 53 Fe IAS 53 Co 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 53 Co & 53 Fe since the errors are three times as important as those of the g.s masses of 53 N and 53 Mn for an evaluation of d & in checking the validity of the IMME.

4. Conclusions 1) CSRe IMS + interpolation Masses of T 3 = -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 ( 53 Ni; gs) and ( 53 Co; 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