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 transcript:

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 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

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

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

Systematics of g 9/2 towards N=40? E* (keV) 67 Fe 65 Fe 63 Fe 61 Fe 59 Fe 57 Fe 55 Fe (5) 3/2-1/2-3/2- (5/2-)(1/2-) ? ?

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

The 66 Mn  decay Pb 352 Lasers ON (5h25’) Lasers OFF (1h28’ scaled to 5h25’) 132 Sb Bi Fe Fe Mn  n Mn Mn 66 Fe Fe 882

P. Adrich et al., PRC77 (2008) A=66 decay chain 7 66 Ni in DIS: R. Janssens, R. Broda, W.B. Walters (priv. comm.) 0 + → 2 + → → 2 + → → 2 + → → 2 + → 0 + T 1/2 = 0.18(1) s Q  = 9598(14) keV 24(2) 4.5(1) (0 + ) (2)4.7(1) 66 Ni 0 T 1/2 = 0.83(8) s Q  = 6340(15) keV - (4) (5) (5) (2)  s 53(2) 4.7(1) 34(2) 4.5(1) (1 + ) (3 + ) (1 + ) 66 Co (4 + ) (0 + ) (2 + ) (1 +,1 -, 2 + ) (4) (5) (4) (5) (2) 4.6(1) 66 Fe - (1) (2) (6) 66 Mn J<=2  T 1/2 = 64.2(8) ms Q  = 13.3(5) MeV P n = 7.6(7) % 2364 (6 + )

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

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) (3-) (5-) (4-) (3)1032 3(2) (4) (12) (3) (5) Fe p 1/2 f 5/2 g 9/2  f 7/2 28 p 3/ Fe  1 st 150 ms after proton pulse Not placed E (keV)I (%) 2233(3) 2293(1) 2363(2) 9494(1) (9) 10956(2) (9) (8)

68 Co and comparison to 66 Co 10 p 1/2 f 5/2 g 9/2  f 7/2 28 p 3/ Co  Fe T 1/2 = 155(50) ms Q  = 8.2(8) MeV (2-,2+) 1+ 73(5) 10(2) 12(2) 4.3(3) 5.1(3) 4.8(3) (2) (3) (3) Co  Fe T 1/2 = 830(80) ms Q  = 6.340(15) MeV (4) (5) (5) (2) 4.7(1) 34(2) 4.5(1) 1+1+ (3 + ) Co (2) (5) (2 + ) (Clean?) 68Fe bg spectrum Fe ,68 Co Fe-cleaned   (0.1s-1s) – normalized  (0-0.1s) 511

A new isomer observed in 63 Fe keV - scaled (b) 625, 775, 1132 keV (a) (a) – (b) 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) (2) (1) (1) (1) (1) (1) (1) (1)

63,65,67 Fe low-energy structures ps* ps* M1/E1 E2 (1/2 - ) ms (9/2 + ) M2 (3/2 - ) (5/2 - ) 6.1 s * B. Olaizola et al., ARIS2011 presentation 26 Fe (5/2 + ) 63 Mn (5/2 - )  ps * 402(10) 1.1 s 0.81 s ps * M2 M1(/E2?) (7/2 + ) (1/2 - ) (9/2 + ) (3/2 - ) (5/2 + ) (5/2 - ) E1 E2 M x 153  s 390+x x s (1/2 - ) (5/2 + ) (3/2 - ), (5/2 - ) ns E1 (7/2 + ) (9/2 + ) 26 Fe Fe Mn (5/2 - )  67 Mn (5/2 - ) 

Systematics of g 9/2 towards N= E* (keV) 67 Fe 65 Fe 63 Fe 61 Fe 59 Fe 57 Fe 55 Fe /2-1/2-3/2- (5/2-)(1/2-) 475 (1/2-)

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

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

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