Recent NUSTAR Experiments with Relativistic Uranium Beams
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1 Recent NUSTAR Experiments with Relativistic Uranium Beams Hans Geissel GSI and Justus Liebig University Giessen Discovery of new n-rich Isotopes Phys. Lett. B 717, 371 (2012) New Accurate Mass Measurements Nucl. Phys. A 882, 71, 2012 New Experimental Developments towards the Super-FRS
2 Overview
3 Stop pingp ower ofrela tivisti cheav yion s Brea FRS k-downof experime therelativntalresults werethe isticbethe theory, motivation ofth and enewthe A.H.Soer oreticalde ensen velopmen tbyj.lind Secondary Nuclear Beam Facility FRS: In-flight Separator & High-Resolution Spectrometer 3 SIS Decay Spectroscopy, High-resolution momentum measurements 2. Masses, Lifetimes, Direct Reactions, Isomeric Beams 3. Reactions Studies (Complete Kinematics)
4 In-Flight Identification of Exotic Nuclei FRS Branch 1 TPC Bρ E TOF v MUSIC E Bρ E mvγ q Z q Z 2
5 Isomer Tagging Technique 175 Lu Verification of Particle Identification E =353 kev 175m Lu T 1/2 =1.45(30) s 175m Lu: E =353.3 kev (5/2-7/2 + ), T 1/2 =1.49(7) s P.E. Garrett et al. PRC69 (2004) K.H. Johansen et al, Nucl. Phys. A133 (1969) 213 5
6 Cross-Section Measurement σ f N P N N f T f corr N f : number of fragments reaching the final focaal plane N P : total number of primary beam particles N T : number of atoms in the target (cm -2 ) f corr accounts for: limited transmission of the FRS, losses due to secondary reactions in the matter, dead-time of the detectors and data acquisition.
7 Reaction Mechanism Z = 60 Fragmentation Fission Z = 75 Fragmentation Fission 1,0 1,0 0,8 0,8 / Tot 0,6 0,4 0,2 / Tot 0,6 0,4 0,2 0, ,0 A 157 Nd T frag = 0.10 T fiss = / Tot 0,8 0,6 0,4 0,2 0,0 Z = 68 Fragmentation Fission 178 Er T frag = 0.23 T fiss = , A 191 Re T frag = 0.41 T fiss = ABRABLA: A J.-J. Gaimard, K.-H. Schmidt Nucl. Phys. A 531 (1991) 709. A. Kelic et al., Proceedings of the Joint ICTP- IAEA, IAEA INDC(NDS)-530 (2008).
8 New Neutron-Rich Isotopes F. Farinon, J. Kucewicz EPAX 3.0: K. Sümmerer to be published in Phys. Rev. C (2012), arxiv id COFRA: J. Taieb et al., Nucl. Phys. A 724 (2003)
9 Discovery of 60 New Isotopes New Isotopes J. Kurcewicz, F. Farinon
10 FRS-ESR Experiments Monoisotopic Fragment Beams Stored in the ESR
11 Schottky Frequency Spectra Sensitivity to Single Ions
12 Velocity Profile of the Electron Beam Influence on the Mass Measurements L. Chen et al., Nucl. Phys. A 882 (2012) 71. ( M M b b 2 i i, syst b 2 stat 2 syst 2 i ( M i, syst ) ( i ) ( ) ) N n Systematic Error syst 10 kev
13 Comparison with AME03 AME03: G. Audi, A. H. Wapstra, C. Thibault, Nucl. Phys. A 729 (2003) 337. Comparison to improved mass values 1000 Comparison to extrapolated mass values ME AME03 -ME SMS [kev] ME AME03 -ME SMS [kev] A A ME 19 kev rms 111 kev ME 133 kev rms 195 kev Z. Patyk
14 Comparison with ISOLTRAP Z. Patyk, R. Knöbel ISOLTRAP data: F. Herfurth et al., Eur. Phys. J. A 25 (2005) D. Neidherr et al., Phys. Rev. Lett. 102 (2009) C. Weber et al., Nucl. Phys. A 803 (2008) 1. ME ISOLTRAP -ME SMS [kev] Rn 224 Rn 225 Rn Rn Rn 228 Rn 229 Fr 230 Fr 231 Ra 232 Ra With 229 Fr: ME 14keV rms 48keV Without 229 Fr: ME 0. 22keV rms 19keV rms 1 n n i 1 ( ME SMS ME Isoltrap ) 2 i L. Chen et al., Nucl. Phys. A 882 (2012) 71.
15 Comparison with Mass Models L. Chen et al., Nucl. Phys. A 882 (2012) FRDM HFB-14 Duflo & Zuker HFB-17 Po 1.5 FRDM HFB-14 Duflo & Zuker HFB-17 Ra ME theo -ME ex p [MeV] ME theo -ME ex p [MeV] N N FRDM: P. Möller et al., At. Data Nucl. Data Tables 59 (1995) 185. HFB 14: S. Goriely, M. Samyn, and J.M. Pearson, Phys. Rev. C 75 (2007) and references therein. HFB 17: S. Goriely, N. Chamel, and J.M. Pearson, Eur. Phys. J. A 42 (2009) Duflo & Zuker: J. Duflo, A.P. Zuker, Phys. Rev. C 52 (1995) R23. Experimental data not marked in red: G. Audi, A. H. Wapstra, C. Thibault, Nucl. Phys. A 729 (2003) 337.
16 Lifetime Measurements of Short-lived Nuclei Applying Stochastic and Electronic Cooling Bound-state Beta-Decay of 207 Tl Tl Tl m 207m Tl Pb Pb T. Otsubo, Phys. Rev. Lett. 100, (2008) D. Boutin PhD
17 Measured Nuclear Electron-Capture of H-like & He-like 140 Pr and 142 Pm Ions Yu.A. Litvinov et al., Phys. Rev. Lett. 99 (2007) Results for 140 Pr Experiment Theory Relative probability of EC Decay Neutral 140 Pr: P = He-like 140 Pr: P = 2 H-like 140 Pr: P = 3 Experiment 142 Pm N. Winckler et al., Phys. Lett. B679 (2009) 36 Experiment: N. Winckler (PhD) Theory: Z. Patyk et al.pr C77 (2008)
18 Half-life of Neutral α-emitters Primary beam: 238 U 73+ Intensity: up to /spill Target: Be 2.5 g/cm 2 Half-life measurement for stored bare and few electrons ions Double-sided strip detectors: surface: 5x5 cm 2 thickness 1 mm 2x mm strips time resolution: 25 ns
19 Half-life of neutral 213 Fr and 214 Ra Fabio Farinon PhD Oct Fr T 1/2 σ s T /T 1/2 0.8% 214 Ra T 1/ s σ T /T 1/2 0.8%
20 Half-life of H-like and Neutral 213 Fr (GSI) (ITALY) (GSI) (GSI) The results of the pilot experiment at the ESR are a strong evidence against the predictions of the theoretical paper from Erma ( λ / λ ~ 34 %). (A. Erma, Phys. Rev. 105, 1957).
21 FRS Ion Catcher ~ GeV/u ~ MeV/u ~ ev ~ kev Fragment Separator FRS Production, separation and range-bunching Cryogenic Stopping Cell Stopping, thermalization, extraction RFQ Beam Line Ion cooling, transmission, differential pumping, isotope separation, diagnosis, beam distribution introduction of reference ions Multiple-reflection TOF-MS Ion identification, isobar separation direct mass measurements Beam from Super-FRS W.R. Plaß et al., GSI Scientific Report 2010, p. 137 (2011) Nucl. Instrum.Methods B, 266 (2008) 4560.
22 Mass Resolving Power (FWHM) MR-TOF-MS Performance: Mass Resolving Power R ( N ) = x10 5 2x10 5 m/ m = 10 5 after 5 ms time-of-flight 1x10 5 R( N) 2 T Time-of-Flight / ms N T 2 0 Turn T 0 ( N T Turn ) 2 T. Dickel W.R. Plass 133 Cs +, Ion kinetic energy 760 ev
23 MR-TOF-MS Performance: Mass Resolving Power T. Dickel W.R. Plass GSI SCIENTIFIC REPORT 2010 PHN-NUSTAR-FRS-08
24 First 1 GeV/u 238 U Run with Cryogenic Stopping Cell & MR-TOF-MS with FRS October 2011 CSC 100 mbar, 85K MR-ToF-MS First Results: Short-lived projectile fragments ( 223 Th, 221 Ac) from 1 GeV/u 238U have been accepted and transmitted with high efficiency. The combination of the two devices open a novel field for studies with exotic nuclei. CSC and MR-ToF-MS online at the final focal plane at the FRS
25 Summary Mass-, Lifetime Measurements of stored exotic nuclei have contributed significantly to the basic knowledge of matter. The discovery of 60 new neutron-rich isotopes have opened up a new field for nuclear structure physics and astrophysics. The Ion Catcher consisting of a cryogenic gas stopping cell and the MR-Tof open a new field for spectroscopy with low-energy cooled reaction products at in-flight separators like FRS, Super-FRS. SHIP and LEB.
26 Acknowledgements IONAS Group at JLU Gießen S. Ayet, U. Czok, T. Dickel, M. Diwisch, J. Ebert, H. Geissel, F. Greiner, E. Haettner, C. Horbach, C. Jesch, N. Kuzminchuk, R. Knöbel, J. Lang, M. Petrick, W.R. Plaß, M.P. Reiter, A.-K. Rink, C. Scheidenberger, B. Sun, W. Lippert, M. Yavor FRS Ion Catcher / S411 Collaboration P. Dendooven, T. Dickel, J. Ebert, A. Estrade, F. Farinon, H. Geissel, E. Haettner, C. Jesch, N. Kalantar-Nayestanaki, R. Knöbel, J. Kurcewicz, J. Lang, I.D. Moore, C. Nociforo, H. Penttilä, S. Pietri, W.R. Plaß, A. Prochazka, S. Purushothaman, M. Ranjan, M.P. Reiter, S. Rinta-Antila, C. Scheidenberger, M. Takechi, H. Weick, J.S. Winfield
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