Piotr Bednarczyk

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Piotr Bednarczyk

Piotr BednarczykInstytut Fizyki Jądrowejim. Henryka NiewodniczańskiegoPolskiej Akademii NaukQuest for intruder band terminating states in themedium mass A 40 -60 shell model nuclei;challenge for experiments and theory19th Nuclear PhysicsWorkshop"Marie & Pierre Curie"Kazimierz, 2012


Origin of angular momentum in an atomic nucleusversusNeed forspectroscopicdata close toI max Regular rotationalbands E~I(I+1) „chaotic” level distributionKazimierz Dolny


Quadrupole collectivity across the nuclear chartRear earth nuclei-nuclear rigid rotor (SD)-maximum aligned spin >> 100ħ-macroscopic-microscopictheory (liquid drop + shellcorrection)Kazimierz Dolny


Quadrupole collectivity across the nuclear chartpf nuclei-regular rotational bands (SD)-maximum spin < 30ħ-SM approach in some casesf 7/2 nuclei-strong collectivity [B(E2) >>1 W.u.]-maximum spin < 20ħ-fully accounted for by SMKazimierz Dolny


sensitivityEvolution Steady of increase nuclear in rotation g-detection at the sensitivity highest spinsEUROBALLultra high spin I~70ħ,terminating bands ( 158 Er)E.Paul et al.,PRL 98, 012501 (2007)superdeformationA. Machiavelli and I.Y.Lee et al. Rep.Prog.Phys. 66, 1095 (2003)Kazimierz Dolny


sensitivityIncrease in g-detection sensitivityAGATAGamma spectroscopyfar from stability atradioactive beams(RIB)ultra high spin I~70ħ,terminating bands ( 158 Er)superdeformationA. Machiavelli and I.Y.Lee et al. Rep.Prog.Phys. 66, 1095 (2003)Need for ancillary detectorsKazimierz Dolny


Recoil Filter Detector (Kraków)LNL legnaroRFD is a set of HI detectors.They pick up EvaporationResidues in coincidence withg-raysRFDGASPTime-of-Flight techniqueallows to deduce actualvelocity of every recoil and tofilter out unwanted reactionchannels:scattered beam, coulex, fissionW. Męczyński et al., NIM A580, 1310 (2007)Kazimierz Dolny


Improvement in g-spectra by a coincident recoil detection Doppler broadening reduction69Aswithout RFD=2.7%with RFDGASP + RFD (2009), 32 S (95MeV) + 40 Ca → 72 Kr(CN)Kazimierz Dolny


Improvement in g-spectra by a coincident recoil detection Lifetime determination - lineshape analysist ~ pst ~10 fsEmission in vacuumGASP + RFD (2009), 32 S (95MeV) + 40 Ca → 72 Kr(CN)Emission in a targetKazimierz Dolny


Collective effects in light f 7/2 shell nucleiAt low spin / < 1980/:‣ Fast E2 transitions (tens W.u)‣ Collective bands of unnatural parity(particle-hole states)At high spin:Experimental difficulties:‣ fast recoil velocity‣ high energy transitionsBreak through /~2000/:‣ Arrays of Ge detector arrays(GASP, EUROBALL, GAMASPHERE)‣ Ancillary- particle and HI detectors‣ Deformed, core excited states (up to I max ):40-44Ca, 42-45 Sc, 44-46 Ti , 46,47 VDopplerbroadeningRFD‣ Superdeformation 36,38,40 Ar, 40,42 Ca, 44 TiKazimierz Dolny


„Rotation” of 48 Cr100SnI max80Zr58Ni40CaCaurier 1995, Cameron 1996SM: extended fp shell effective interactionKazimierz Dolny


SM descroption of (super)deformation100Sn48Cr80Zr58Ni40Caw [MeV]36Ar, 40 Ca –SD bands (b~0.5) sd 8 holes fp 4, 8 particlesKazimierz Dolny


Deformation along the p = ’+’ p-h band in 45 ScEUROBALL & RFD45ScSphericalsymmetry statesQuadrupolesymmetry states ANTOINE Interaction:KB3 (pf) + sd holes (sd) -1 (fp) 6A.Poves et al., PRC58, 179 (1998 )Kazimierz Dolny


Izospin T=0, T=1 excitations in odd-odd N=Z nuclei252423222120Kazimierz Dolny


Izospin T=0, T=1 excitations in odd-odd N=Z nucleiT=146VA=46, T=1 isospin triplet252423222120S.Lenzi Phys. Scr. T88, 100 (2000)Kazimierz Dolny


Izospin T=0, T=1 excitations in odd-odd N=Z nuclei46VT=046V, T=0 isospin singlet252423222120S.Lenzi Phys. Scr. T88, 100 (2000)Kazimierz Dolny


(p-n) fp T=0 coupling in odd-A N=Z+1 nuclei25242322pd 3/2-1 50 Mn(T=0)pd 3/2-1 46 V(T=0)2120Kazimierz Dolny


(p-n) fp T=0 coupling in odd-A N=Z+1 nucleipd 3/2-1 46 V(T=0)d 3/2-1f 7/26b = 0.217/2 7/2„K=9/2”46V(T=0)Kazimierz Dolny


(p-n) fp T=0 coupling in odd-A N=Z+1 nucleipd 3/2-1 46 V(T=0)d 3/2-1f 7/26b = 0.217/2 7/246V(T=0)Kazimierz Dolny


Excitation energy [MeV]High spins in 45 Ti – SM results ANTOINE sdpf.smp hole ( 46 V analogue)p,n hole (mixed)Exp.Exp.Kazimierz Dolny


Deformation driven high spin structure of 45 Tiquadrupole deformation (SM view): if Q 0 ( Q spec ) = Q 0 ( B(E2) ) increase of deformation at HS due to isospin degree offreedeomKazimierz Dolny


Test of EDF components at band terminationTS-sphericalmeanfieldMeV45ScDEDE(SO)=E ex (d 3/2-1f 7/2n+1)- E ex (f 7/2n )d 3/2-1f 7/2n+1f 7/2nGS-resid. interactions -quadrupolefieldH.Zdunczuk et al., PRC 71, 024305 (2005)W.Satula, et al. PRC 81, 054310 (2010)Kazimierz Dolny


Towards heavier (more collective) systemsKazimierz Dolny


Structure of 69 AsEUROBALL + EUCLIDESI.Stefanescu et al., PRC 70 044304 (2004)HS states: pf,g 9/2 g-soft, b~0.369Asground state: pf oblateKazimierz Dolny


Structure of 69 AsCNS:I.Stefanescu et al., PRC 70 044304 (2004)69AsSM: p(g 9/2 ) 1 n(g 9/2 ) 2 , I max =49/2M.Hasegawa, et al., PRC 72, 064320 (2005)Kazimierz Dolny


Is 69 As superdeformed ?M.Matejska-Minda et al., APP (2013)Similar to SD in 68 GeGASP+RFD holes in 56 Ni coremust be involvedGASP + RFD (2009)32S (95MeV) + 40 Cat 0.5The interpretation needs to be reconsideredKazimierz Dolny


Prospects: EAGLE, HIL, Warsaw 30 HPGe ACS detectors e g =(1%-4%) Lifetimes along rotational bands in fp nucleiKazimierz Dolny


countsProspects: GALILEO LNL, LegnaroFar geometry Ultra-HS in n-rich Ba isotops, proof ofprinciple studies (follow up at SPIRAL2 RIB)Close geometry HS Spectroscopy of very heavy nucleiA>>200Rejection of a fission backgroundPb X-raysgg 30 GASP detectors 10 triple (EB) clusters e g ~8%12008004000ggrecoil220 Th•221 ThTh X-rays219 Ra218 Ra217 Ra•100 200 300 400 500g-ray energy (keV)92 MeV 16 O + 0.4 mg/cm 2 208 PbKazimierz Dolny


AcknowledgesIFJ PAN, KrakówP.Bednarczyk, M.Ciemała*, B. Fornal, J. Grębosz, M. Kmiecik, M.Krzysiek*, A. Maj,M.Matejska-Minda*, W.Męczyński, J.Styczeń, M.Ziębliński*student PhDIPHC, StrasbourgD.Curien et al. (experiment)F.Nowacki et al. (theory)Preparation for new facilities:LNL-INFN, Legnaro-PadovaC. Ur et al.University and INFN, MilanoS.Leoni et al.HIL, WarszawaJ. Srebrny et al.GANIL, CaenCh. Schmitt et al.Kazimierz Dolny

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