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The 11 th Inter. Conf. on nucleus-Nucleus Collision, San Antonio Texas, May 27- June 1

The 11 th Inter. Conf. on nucleus-Nucleus Collision, San Antonio Texas, May 27- June 1. Test of IMME in fp shell via direct mass measurements of T Z = -3/2 nuclides. Yu-Hu Zhang Institute of Modern Physics, Chinese Academy of Sciences Lanzhou, China May 30. 2012, San Antonio Texas, USA.

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The 11 th Inter. Conf. on nucleus-Nucleus Collision, San Antonio Texas, May 27- June 1

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  1. The 11th Inter. Conf. on nucleus-Nucleus Collision, San Antonio Texas, May 27- June 1 Test of IMME in fp shell via direct mass measurements of TZ = -3/2 nuclides Yu-Hu Zhang Institute of Modern Physics, Chinese Academy of Sciences Lanzhou, China May 30. 2012, San Antonio Texas, USA

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

  3. 1. Introduction Degenerate if no charge-dependent Interaction, and DnH corrected for. Charge-dependent effects - 3/2 - 1/2 + 1/2 (A,T,Jp) + 3/2 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. T=3/2 quartet What is IMME ? (Isobaric Multiplet Mass Equation) N = Z - 3/2 g.s - 1/2 IAS + 1/2 IAS Proton + 3/2 g.s Neutron + d(A,T)T33 or + e(A,T)T34

  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.87.142501(2001)

  5. Related publications 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: 10.1103/PhysRevLett.87.142501(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: 10.1103/PhysRevLett.88.122501 (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.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 equation 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.IwamotoS.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

  6. Test the IMME in pf Shell N=Z f7/2

  7. 2. Mass measurements in CSRe SSC(K=450) 100 AMeV (H.I.), 110 MeV (p) SFC (K=69) 10 AMeV (H.I.), 17~35 MeV (p) CSRe RIBLL2 RIBs at hundredsof AMeV RIBLL1 RIBs at tensof AMeV CSRm 1000 AMeV (H.I.),  2.8 GeV (p) 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

  8. Principle of mass measurement in CSRe ToF Injection

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

  10. HIRFL−CSR DT Detector

  11. Mass measurement in CSRe (IMS mode) ToF Injection

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

  13. 58Ni beam: Revolution Time Spectrum Ni-53 Fe-49 V-43 Mn-47 Cu-55

  14. 58Ni beam: Revolution Time Spectrum Sum of 760 sub-spectra, each of which includes ~100 spills 34Ar, 51Co: same m/q

  15. Ion-amplitude identification:51Co

  16. Mass excesses for the nuclides of interest (58Ni beam) M/q = a＋ b T +c T 2 + d T 3 Xn =1.18 Nuclides for Calibration: Nuclides used for M/Q calibration are within a time window which is not far from the isochronous condition.

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

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

  19. 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)T33 N=Z ? ? ? ?

  20. Test the IMME in fp shell nuclei d coeficients increase gradually up to A=53 for which d is 3.5s deviated from zero.

  21. Shell model calculations

  22. Mass Excesses uncertainty: 0.6 keV 25 keV 3. 4 keV 19 keV 53Mn gs 53Ni gs 53Fe IAS 53Co IAS More attention should be paid to the excitation Energies of IAS’s in 53Co & 53Fe since the errors are 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.

  23. 4. Conclusions • CSRe IMS + interpolation • Masses of T3= -3/2 nuclei • measured. • 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.

  24. Thank you for your attention and welcome you to visit IMP, Lanzhou

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