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ISOLDE Workshop CERN, 5 December 2011 Beta-decay studies of neutron-rich manganese isotopes D. Pauwels 1,2, D. Radulov 1, J. Van de Walle 3, I.G. Darby.

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Presentation on theme: "ISOLDE Workshop CERN, 5 December 2011 Beta-decay studies of neutron-rich manganese isotopes D. Pauwels 1,2, D. Radulov 1, J. Van de Walle 3, I.G. Darby."— Presentation transcript:

1 ISOLDE Workshop CERN, 5 December 2011 Beta-decay studies of neutron-rich manganese isotopes D. Pauwels 1,2, D. Radulov 1, J. Van de Walle 3, I.G. Darby 1, H. De Witte 1, J. Diriken 1, D.V. Fedorov 4, V.N. Fedosseev 5, L.M. Fraile 6, M. Huyse 1, U. Köster 7, B.A. Marsh 5, L.-A. Popescu 2, M.D. Seliverstov 5, A.M. Sjoedin 8, P. Van den Bergh 1, P. Van Duppen 1, M. Venhart 1, W.B. Walters 9, K. Wimmer 10 1. Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Leuven 2. SCKCEN, Belgian Nuclear Research Centre, Mol 3. ISOLDE, CERN, Geneva 4. Petersburg Nuclear Physics Institute, Gatchina 5. Engineering Dept., CERN, Geneva 6. Facultad de Sciencias Fisicas, Universidad Complutense, Madrid 7. Institut Laue-Langevin, Grenoble 8. KTH-Royal Institute of Technology, Stockholm 9. Department of Chemistry and Biochemistry, University of Maryland, Maryland 10. Physik-Department, Technische Universität München, Garching 1

2 Beta-decay studies in the 68 Ni region using resonant laser ionization 2 FacilityProduction method LISOL p(30MeV) → U thin target in buffer gas cell ISOLDE p(1.4GeV) → UC x thick & hot target 58 Mn 3.0(1)s P( 68 Mn): 0.8 ions/  C

3 A sudden onset of collectivity below 68 Ni 3 Picture from W. Rother et al., PRL106 (2011) 022502 68 Ni (N=40): stabilizing features 66 Fe (N=40): collective features B(E2) corresponds to  2 ~0.28 64 Cr (N=40): maximum collectivity expected Rother et al., PRL106, 022502 (VPS scheme) S. Lenzi et al., PRC82, 054301 (SM with the LNPS interaction)

4 Systematics of g 9/2 towards N=40? 4 0 1000 2000 3000 4000 E* (keV) 67 Fe 65 Fe 63 Fe 61 Fe 59 Fe 57 Fe 55 Fe 41393735333129 3860 2455 1517 861 402(5) 3/2-1/2-3/2- (5/2-)(1/2-) ? ?

5 LISOL  -  detection setup at ISOLDE 5 Beam Tape system MINIBALL  detectors plastic  detectors Top view MINIBALL: 5.8% photo-peak efficiency at 1.332 MeV 3 plastic detectors: 50% beta efficiency DGF system: digital read-out on event-by-event basis Polyethylene-borax-lead-brass shielding DGF system

6 The 66 Mn  decay 6 214 Pb 352 Lasers ON (5h25’) Lasers OFF (1h28’ scaled to 5h25’) 132 Sb 697 214 Bi 609 66 Fe 471 65 Fe 340 66 Mn  n 364 66 Mn 573 66 Mn 66 Fe 806 65+66 Fe 882

7 P. Adrich et al., PRC77 (2008) 054306 A=66 decay chain 7 66 Ni 1426-1246 in DIS: R. Janssens, R. Broda, W.B. Walters (priv. comm.) 0 + → 2 + → 0 + 2 + → 2 + → 0 + 3 + → 2 + → 0 + 4 + → 2 + → 0 + T 1/2 = 0.18(1) s Q  = 9598(14) keV 24(2) 4.5(1) 0+0+ 2+2+ 2+2+ 1426 3228 (0 + ) 2672 1426 1246 1804 69(2)4.7(1) 66 Ni 0 T 1/2 = 0.83(8) s Q  = 6340(15) keV -- 0 175 32(4) 807 22(5) 981 18(5) 175 981 0.83(2)  s 53(2) 4.7(1) 34(2) 4.5(1) (1 + ) (3 + ) (1 + ) 66 Co (4 + ) (0 + ) 0+0+ 2+2+ (2 + ) (1 +,1 -, 2 + ) 0 573.4 1407.2 1413.8 1880.9 2874.1 1460 2.7(4) 1307.5 5.3(5) 840 4.8(4) 834 7.6(5) 573 100 31(2) 4.6(1) 66 Fe -- 2301 16(1) 2874 41(2) 1881 4.6(6) 66 Mn J<=2  T 1/2 = 64.2(8) ms Q  = 13.3(5) MeV P n = 7.6(7) % 2364 (6 + )

8 66 Co: a SM comparison with the LNPS interaction 8 66 Fe 0+ -- 34(2) 53(2) <0.8 4.5(1) 4.7(1) >6.4 I(%) Log ft 1+1+ 1+1+ (3 + ) 0 175 982 982 21(2) 806 26(2) 175 28(2) 0.83(2)  s T 1/2 =0.83(8) ms Q b =6.340(15) MeV 1+1+ 1+1+ 0 175 982 X/5000 0.25 (3 + ) X Exp (24%) (39%) (65%) (46%) 1+1+ 1+1+ 3+3+ 0 60 750 0.23 4.9 0.17 LNPS S.M. Lenzi et al., PRC 82 (2010) 054301 F. Nowacki, private communication p 1/2 f 5/2 g 9/2  f 7/2 28 p 3/2 28 40 27 Co 39 66

9 68 Fe structure 9 68 Mn (4-)  T 1/2 = 34.3(10) ms Q  = 14.5(9) MeV P n = 24(2) % 19(5) 28(4) 5.2(2) 4.7(2) 0 521.5 1387.0 2035.8 2253.3 3285.5 0+ 2+ 4+ (3-) (5-) (4-) 1250 33(3)1032 3(2) 865.5 9(4)217.5 4.6(12) 1514 45(3) 865.5 41(5) 521.5 100 68 Fe p 1/2 f 5/2 g 9/2  f 7/2 28 p 3/2 28 40 26 Fe 42 68 522-  1 st 150 ms after proton pulse 865 1250 1514 217 236 Not placed E (keV)I (%) 2233(3) 2293(1) 2363(2) 9494(1) 10592.8(9) 10956(2) 15432.7(9) 22441.9(8)

10 68 Co and comparison to 66 Co 10 p 1/2 f 5/2 g 9/2  f 7/2 28 p 3/2 28 40 27 Co 41 68  0+ 68 Fe T 1/2 = 155(50) ms Q  = 8.2(8) MeV 45.1 207.0 391.3 0 1021.5 (2-,2+) 1+ 73(5) 10(2) 12(2) 4.3(3) 5.1(3) 4.8(3) 1021.5 14(2) 184 16(3) 162 26(3) 45 100 1+ 68 Co  0+ 66 Fe T 1/2 = 830(80) ms Q  = 6.340(15) MeV 0 175 32(4) 807 22(5) 981 18(5) 175 981 53(2) 4.7(1) 34(2) 4.5(1) 1+1+ (3 + ) 1+1+ 66 Co 511 335 0.6(2) 511 102(5) (2 + ) 471 100 (Clean?) 68Fe bg spectrum 45 162 184 67 Fe 189 67,68 Co 694 1022 68 Fe-cleaned   (0.1s-1s) – normalized  (0-0.1s) 511

11 A new isomer observed in 63 Fe 11 94 keV - scaled (b) 625, 775, 1132 keV (a) (a) – (b) 0 357 451 475 626 681 1132 63 Mn (5/2 - )  63 Fe T 1/2 = 275 ms (Ph.D. Hannawald) Q  = 9.2(3) MeV P n = 4.2(5) % 28(3) 4.9(1) 10(2) 5.5(1) 25(3) 5.2(1) 1132 30.3(2) 775 10.7(1) 451 0.7(1) 206 5.3(1) 1534 853 1.2(1) 625 15.4(1) 24 451 16.5(1) 94 18 (1) 357 100

12 63,65,67 Fe low-energy structures 12 357 110 ps* 451 780 ps* M1/E1 E2 (1/2 - ) 475 26 ms (9/2 + ) 18 16 M2 (3/2 - ) (5/2 - ) 6.1 s * B. Olaizola et al., ARIS2011 presentation 26 Fe 37 63 681 (5/2 + ) 63 Mn (5/2 - )  364 110 ps * 402(10) 1.1 s 0.81 s 402+216 455 410 ps * M2 M1(/E2?) (7/2 + ) 9.9 0.15 1.4 24 (1/2 - ) (9/2 + ) (3/2 - ) (5/2 + ) (5/2 - ) E1 E2 M1 367 390+x 153  s 390+x+167 390 390+x+180 0.42 s (1/2 - ) (5/2 + ) (3/2 - ), (5/2 - ) 397 424 ns E1 (7/2 + ) (9/2 + ) 26 Fe 39 65 26 Fe 39 67 65 Mn (5/2 - )  67 Mn (5/2 - ) 

13 Systematics of g 9/2 towards N=40 13 0 1000 2000 3000 4000 E* (keV) 67 Fe 65 Fe 63 Fe 61 Fe 59 Fe 57 Fe 55 Fe 41393735333129 3860 2455 1517 861 402 557-595 3/2-1/2-3/2- (5/2-)(1/2-) 475 (1/2-)

14 Conclusions and outlook 14 58,60-68 Mn decay data taken Wealth of nuclear-structure information in Fe, Co, Ni isotopes Analysis of 63,65-68 Mn decay chains finished or in advanced stadium Important benchmark for LNPS interactions (F. Nowacki) Initial 66 Co calculations done by F. Nowacki F. Nowacki will calculate 66 Fe, 66 Ni Other irons Publish results

15 Q&A 15 64 Ni(t,p) transfer: W. Darcy et al., NPA170 (1971) 253

16 Interpretation of the 66 Co proton intruder D. Pauwels et al., PRC78, 041307R Proton intruder in 67 Co at 492 keV K=1/2 K=3/2 10

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