Lanzhou Yellow River Instutute of Modern Physics CAS

Lanzhou

Yellow River

Instutute of Modern Physics, CAS Heavy-Ions based research center in China. 744 staffs，30～ 45 M $/y research budget.

[RIBF-ULIC-Symposium-009] Physics of Rare-RI Ring, 10 -12 Nov. 2011, RIKEN Isochronous mass measurements of short-lived nuclides at CSRe Yu-Hu Zhang Institute of Modern Physics, CAS 11 Nov. 2011, RIKEN, Japan

[RIBF-ULIC-Symposium-009] Physics of Rare-RI Ring, 10 -12 Nov. 2011, RIKEN Outline 1. 2. 3. 4. Introduction Experiments at CSRe and data analysis Results & Discussion Summary

1. Introduction Please refer to the invited talks of Klaus Blaum (MPI) Meng WANG (CSNSM) Hans Geissel (GSI)

2. Experiments at CSRe and data analysis Layout of HIRFL-CSR complex in IMP SSC SFC RIBLL 1 ECR CSRm RIBLL 2 CSRe

ion t c je To F Principle of mass measurement in CSRe In Isochronous Mass Spectrometry (IMS mode) Low production yield and short-lived nuclides.

Experiments at CSRe 78 Kr + 9 Be Time detector gt=1. 395 368 Me. V/u

Procedure of Data analysis Ions Identification Signals in Oscilloscope Simultion. Exp. P 2

78 Kr beam: Revolution Time Spectrum Nuclides for Calibration: Unknown masses are determined via extropolation

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

Some techniques in the data analysis 1) 2) 3) 4) Magnetic field drift Amplitude-ion identification Extrapolation Interpolation

1) Magnetic Field Drift (78 Kr beam) 53 Co g. s plus 53 Co (3. 2 Me. V isomer)

Ref. Time Shift Correction Ref.

Corrected revolution time spectrum No Correction GSI meth. S 3 min. IMP meth. m/∆m≈1. 7 x 105 53 Co isomer E*=3174. 3(1. 0)ke. V, (20 ps difference)

Experiment: 58 Ni beam Magnetic field stability was improved Dec. 2010 Feb. 2011

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

2) Ion-amplitude identification: 51 Co

3) Extrapolation (78 Kr beam) Nuclides for Calibration:

4) Interpolation (58 Ni beam) Nuclides for Calibration:

Tz = 2, 3/ , - -1 Tz =- 2, m ) 1/ i. B ea N ( 58 m ) ea K r. B ( 78 3. Results and Discussion

Waiting point nucleus 64 Ge ?

Waiting point nucleus 64 Ge ? Abundance of burst ashes Light curve of Type I x-ray burst Effective half-life of 64 Ge Sp(65 As) = -90 (85) ke. V 1 s 2 s 89%– 90% of the reaction flow passes through 64 Ge via proton capture indicating that: 64 Ge is not a significant rp-process waiting point.

Precise mass data of astrophysics interest 43 V 47 Mn 65 As PRC 79, 045802 (2009)

Q-values for the（p, g）reactions of astrophysics interest

Nuclear Physics：test CDE calculations

Nuclear Physics：test the mass of 69 Br Sp(69 Br) = -785 (35) ke. V

Coulomb energy differences between mirror nuclei 8 14 d 5/2 Sp(69 Br) = -785 (35) ke. V ? Anything new ? s 1/2 + d 20 3/2 f 7/2 28 p 3 /2 f 5/2

N =Z Nuclear Physics：test IMME in 1 f 7/2 shell IAS + perturbation

Nuclear Physics：test IMME in 1 f 7/2 shell M (53 Ni; gs) ? M (53 Co; IAS) ? IMME broken ?

4. Summary & persperctives 78 Kr, 58 Ni 1. fragmentation 13 10 65 As: waiting point Sp(69 Br)=-785(35) ? 2. 53 Ni: IMME ? 43 V, 47 Mn: XRBs ?

In progress Previous time Detectors · IMS: double To. F · SMS method Two Time Detectors Schottky Pick-up

2 N i B Fe ea b. m 2 01 ) du -2 led ( 58 in he sc Tz = p. Ex

International collaborations:

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