New Isomers from Fast Fragmentation Reactions Dr. Paddy Regan Dept. of Physics University of Surrey, Guildford, GU2 7XH, UK

Slides:

Advertisements

Similar presentations

Isomer Spectroscopy in Near-Spherical Nuclei Lecture at the ‘School cum Workshop on Yrast and Near-Yrast Spectroscopy’ IIT Roorkee, October 2009 Paddy.

Advertisements

The Long and the Short of it: Some Fundamentals about Nuclear Isomers Paddy Regan Dept. of Physics, University of Surrey, Guildford, GU2 7XH, UK

4/29/20151Cosenors - BentleyOverview Physics of Proton-rich Nuclei in the UK Mike Bentley (Univ. of York, UK) Physics of Proton-rich Nuclei in the UK Mike.

Γ spectroscopy of neutron-rich 95,96 Rb nuclei by the incomplete fusion reaction of 94 Kr on 7 Li Simone Bottoni University of Milan Mini Workshop 1°-

From Magic 208 Pb to the 170 Dy Mid-Shell Paddy Regan WNSL, Yale University, New Haven, CT and Dept. of Physics, University of Surrey, UK

Multinucleon Transfer Reactions – a New Way to Exotic Nuclei? Sophie Heinz GSI Helmholtzzentrum and Justus-Liebig Universität Gießen Trento, May ,

Nucleon knockout reactions with heavy nuclei Edward Simpson University of Surrey Brighton PRESPEC Meeting 12 th January 2011.

12 th January 2011 PRESPEC Decay Physics Workshop University of Brighton 2011 High-spin states feeding seniority isomers in the heaviest N=82 isotones.

Deep-Inelastic and Multinucleon Reactions with Discrete Gamma  ray Spectroscopy: A Brief Review Paddy Regan Dept. of Physics University of Surrey, UK.

Production of Exotic Nuclear Isomers in Fragmentation and Deep-Inelastic Reactions Paddy Regan Dept. of Physics, University of Surrey, Guildford, GU2.

Congresso del Dipartimento di Fisica Highlights in Physics –14 October 2005, Dipartimento di Fisica, Università di Milano Study of exotic nuclei.

Angular momentum population in fragmentation reactions Zsolt Podolyák University of Surrey.

Relativistic Coulomb excitation of nuclei near 100 Sn C.Fahlander, J. Eckman, M. Mineva, D. Rudolph, Dept. Phys., Lund University, Sweden M.G., A.Banu,

University of Brighton 30 March 2004RISING stopped beam physics workshop Microsecond isomers in A~110 nuclei Few nuclei have oblate ground states (~86%

Configuration of RISING for Measurements of Spin-alignment and g-factors by TDPAD.

Rare ISotope INvestigation at GSI Status of the relativistic beam campaign Introduction Fast beam physics program Experimental methods Status and perspectives.

The Long and the Short of it: Measuring picosecond half-lives… Paddy Regan Dept. of Physics, University of Surrey, Guildford, GU2 7XH, UK

Future Challenges Using Decay Spectroscopy with Projectile Fragmentation and In-Beam Deep Inelastic Reactions Paddy Regan Dept. of Physics University of.

D.L. BalabanskiEURISOL workshop, Florence, Nuclear moments of isomeric states studied in transfer reactions in inverse kinematics moments.

Isomer Spectroscopy in Near-Spherical Nuclei Lecture at the ‘School cum Workshop on Yrast and Near-Yrast Spectroscopy’ IIT Roorkee, October 2009 Paddy.

Proton and Two-Proton Decay of a High-Spin Isomer in 94 Ag Ernst ROECKL GSI Darmstadt and Warsaw University.

Spin alignment and g-factor measurements with RISING Maria Kmiecik IFJ PAN NZ22 IFJ PAN Review 5-6 Feb IFJ PAN Review 5-6 Feb

Isospin impurity of the Isobaric Analogue State of super-allowed beta decay experimental technique isospin impurity determination Bertram Blank, CEN Bordeaux-Gradignan.

N. Saito The RISING stopped beam physics meeting Technical status of RISING at GSI N. Saito - GSI for the RISING collaboration Introduction Detector performance.

Recent Results in Fragmentation Isomer Spectroscopy with RISING Paddy Regan Dept. of Physics University of Surrey Guildford, GU2 7XH, UK

1 undressing (to fiddle the decay probability) keV gamma E0, 0 + ->0 + e - conversion decay E x =509 keV, T 1/2 ~20 ns Fully stripping.

Nuclear Structure studies using fast radioactive beams J. Gerl SNP2008 July Ohio University, Athens Ohio USA –The RISING experiment –Relativistic.

abrasion ablation  σ f [cm 2 ] for projectile fragmentation + fission  luminosity [atoms cm -2 s -1 ]  70% transmission SIS – FRS  ε trans transmission.

Isomer Studies as Probes of Nuclear Structure in Heavy, Neutron-Rich Nuclei Dr. Paddy Regan Dept. of Physics University of Surrey Guildford, GU2 7XH

Proton emission from deformed rare earth nuclei: A possible AIDA physics campaign Paul Sapple PRESPEC Decay Physics Workshop Brighton 12 January 2011.

Future for (Stopped) RISING.....the road to DESPEC.

Relativistic Coulomb Excitation of Neutron-Rich 54,56,58 Cr Herbert Hübel Helmholtz-Institut für Strahlen- und Kernphysik Universität Bonn Germany.

1 Beta Counting System Li XiangQing, Jiang DongXing, Hua Hui, Wang EnHong Peking University

Recent Nuclear Structure and Reaction Dynamics Studies Using Mutlinucleon Transfer Reactions Paddy Regan Dept. of Physics University of Surrey,UK

UNIVERSITY OF JYVÄSKYLÄ RDDS measurements at RITU and prospects at HIE-ISOLDE T. Grahn University of Jyväskylä HIE-ISOLDE Spectrometer Workshop, Lund

RNB Cortina d’Ampezzo, July 3th – 7th 2006 Elisa Rapisarda Università degli studi di Catania E.Rapisarda for the Diproton collaboration 18 *

Magnetic moment measurements with the high-velocity transient field (HVTF) technique at relativistic energies Andrea Jungclaus IEM-CSIC Madrid, Spain Andrew.

12/17/20151NuPECC Meeting - BentleyOverview Gamma-ray Spectroscopic Studies of Exotic Nuclei: Towards NuSTAR Mike Bentley (University of York, UK) Gamma-ray.

Β decay of 69 Kr and 73 Sr and the rp process Bertram Blank CEN Bordeaux-Gradignan.

 2-proton emission  experimental set-up  decay results  2p emission from 45 Fe  perspectives Jérôme Giovinazzo – CEN Bordeaux-Gradignan – France PROCON’03.

Progress in  half lives of nuclei approaching the r-process path at N=126 José Benlliure Universidad de Santiago de Compostela, Spain INPC 2007.

W. Nazarewicz. Limit of stability for heavy nuclei Meitner & Frisch (1939): Nucleus is like liquid drop For Z>100: repulsive Coulomb force stronger than.

Rare Isotope Spectroscopic INvestigation at GSI. abrasion ablation  σ f [cm 2 ] for projectile fragmentation + fission  luminosity [atoms cm -2 s -1.

NS08 MSU, June 3rd – 6th 2008 Elisa Rapisarda Università degli studi di Catania E.Rapisarda 18 2.

Along the N=126 closed shell: study of 205 Au through its πh 11/2 -1 isomeric decay Zs.Podolyák, A.Algora, C.Brandau, K.Burkard, P. Butler, J.Cederkall,

Prof. Paddy Regan Department of Physics

FAIR (Facility for Antiproton and Ion Research) (Darmstadt, Germany) low-energy cave MeV/u fragmentation/fission ~1GeV/u fragment separator 350m.

Nuclear Spectrcosopy in Exotic Nuclei Paddy Regan Dept,. Of Physics University of Surrey, Guildford, UK

Beta decay around 64 Cr GANIL, March 25 th V 63 V 64 V 60 V 61 V 63 Cr 64 Cr 65 Cr 61 Cr 62 Cr 60 Cr 64 Mn 65 Mn 66 Mn 65 Fe 67 Fe 1) 2 + in 64.

Some (more) High(ish)-Spin Nuclear Structure Paddy Regan Department of Physics Univesity of Surrey Guildford, UK Lecture 2 Low-energy.

Observation of new neutron-deficient multinucleon transfer reactions

Decay studies in Exotic, Neutron- Rich A~200 Nuclei Steven Steer for the Stopped Beam RISING Collaboration Dept. of Physics, University of Surrey Guildford,

Determining the rp-Process Flow through 56 Ni 56 Ni is a Waiting Point and imposes a delay Decay Lifetime: 2.3x10^4 s ; Burst Time: 10 – 100 s Largest.

Adam Maj IFJ PAN Krakow Search for Pigmy Dipole Resonance in 68 Ni RISING experiment in GSI EWON Meeting Prague, May, 2007.

Exotic neutron-rich nuclei

Study of isomeric states using gamma spectroscopy around N=40 C. Petrone 1,2, J. M. Daugas 3, M. Stanoiu 1, F. Negoita 1, G. Simpson 4, C. Borcea 1, R.

The experimental evidence of t+t configuration for 6 He School of Physics, Peking University G.L.Zhang Y.L.Ye.

Decay scheme studies using radiochemical methods R. Tripathi, P. K. Pujari Radiochemistry Division A. K. Mohanty Nuclear Physics Division Bhabha Atomic.

Technical solutions for N=Z Physics David Jenkins.

Jun Chen Department of Physics and Astronomy, McMaster University, Canada For the McMaster-NSCL and McMaster-CNS collaborations (5.945, 3+ : **) (5.914,

1 EUNPC2015Aug 30 - Sep 4, 2015 LIFETIME MEASUREMENTS TO STUDY THE NATURE OF EXCITED STATES BEYOND N=50 AGATA + GANIL Andrea Gottardo.

PANIC’08 Eilat, November 13th, 2008 Teresa Kurtukian Nieto CEN Bordeaux-Gradignan Supernova remnant N49 Photo Credit: Hubble Heritage Team (STScI / AURA),

Proton emission from deformed rare earth nuclei: A possible AIDA physics campaign Paul Sapple PRESPEC Decay Physics Workshop Brighton 12 January 2011.

Decay spectroscopy with LaBr3(Ce) detectors at RIKEN and GSI

Maria Kmiecik, Giovanna Benzoni, Daisuke Suzuki

Feeding of low-energy structures with different deformations by the GDR decay: the nuBall array coupled to PARIS M. Kmiecik, A. Maj, B. Fornal, P. Bednarczyk.

Rare Isotope Spectroscopic INvestigation at GSI

Rare Isotope Spectroscopic INvestigation at GSI

Rare Isotope Spectroscopic INvestigation at GSI

Presentation transcript:

New Isomers from Fast Fragmentation Reactions Dr. Paddy Regan Dept. of Physics University of Surrey, Guildford, GU2 7XH, UK

primary beam 1GeV/u Production target Central focus, S2 Final focus, S4  E(Z 2 ) catcher degrader dipole, B  scint MW=x,y scint (veto) Use FRS (or LISE3) to ID exotic nuclei. Transport some in isomeric states (TOF~ x00ns). Stop and correlate isomeric decays with nuclei id. eg. R. Grzywacz et al. Phys. Rev. C55 (1997) p1126 -> LISE C.Chandler et al. Phys. Rev. C61 (2000) >LISE M. Pfutzner et al. Phys. Lett. B444 (1998) p32 -> FRS

Chandler et al. Phys. Rev. C61 (2000) Ge 69 Se 76 Rb

Heaviest odd-odd,N=Z gammas, isobaric analog states ? 86 Tc, C. Chandler et al. Phys. Rev. C61 (2000)

8 + isomer in 78 Zn, real evidence of 78 Ni shell closure. J.M.Daugas et al. Phys. Lett. B476 (2000) p213

136 Sb 135 Te Use FRS to select projectile fission products (forward boosted ones). Note transmission a few %. T 1/2 =565(50) ns state in 136 Sb (Z=51, N=85) M. Mineva et al. Eur. Phys. J. A11 (2001) p9-13

Gamma-gamma analysis on 200 Pt isomer (21 ns!), Caamano et al. Nucl. Phys. A682 (2001) p223c; Acta Phys. Pol. B32 (2001) p763

33 ns isomer in 195 Os (last stable 192 Os), useful test of structure in prolate/oblate shape coexistence region. 194 Os Wheldon et al. Phys. Rev. C63 (2001) (R) First id of ‘doubly mid-shell’ nucleus, 170 Dy (N=104, Z=66). K=6 + isomers predicted for well deformed N=104 nuclei. TRS calcs (F.Xu) predict a very ‘stiff’, highly deformed prolate nucleus. Could be the best K-isomer? Data from M.Caamano et al.

C. Schlegel et al.Physica Scripta T88 (2000) p72 High spins (>35/2) populated

Proton drip line isomer physics from 208 Pb fragmentation. N=74 chain of K  =8 - isomers. Next in chain would be 140 Dy, proton decay daughter of (deformed) 141 Tb. Isomers orginally seen in fusion-evap (ANU data) A.M.Bruce et al. Phys. Rev. C50 (1994) p480 and C55 (1997) p620

M. de Jong et al. Nucl. Phys. A613 (1997) p435 M. Pfutzner et al. Phys. Rev. C & Acta. Phys. Pol. (submitted)

Isomeric Ratio Calculations M. Pfutzner et al. Acta. Phys. Pol. & Phys. Rev. C, (submitted)

M. Pfutzner et al. submitted to Phys Rev. C

Prompt flash knocks out a large portion of the detectors….effectively reduces the gamma efficiency by upto 80%! Need digital electronics and time stamping

The problem Single ion selected by the fragment separator time counts 0 plastic Ge detector trigger, time start promptisomer decay room background thick Al stopper Energy  100 MeV/u  R  60 mg/cm 2 Al  Probability to detect prompt radiation is large.  In a standard set-up only the first gamma is recorded.

DGF detection scheme A1 A2A3 A4 Ionization chamber L2 R4 R2 L4 Plastic scintillators FRS second stage Energy loss, DE Beam Position x2 - TAC(L2-R2) - Position x4 - TAC(L4-R4) - TAC(L2-L4) - TAC(R2-R4) - TOF -   Gate logic P a r t i c l e i d e n t i f i c a t i o n DGF 1, 2 Clover detectors Gamma energy, EG      Gate logic      D e c a y s p e c t r o s c o p y DGF 3, 4, 5 Beam macrostructure time [s] Storing data in memory buffers Readout time [  s] microstructure 100  s Gate Ions Gammas

M.Pfutzner,M.Hellstrom et al.

Pfutzner, Hellstrom, Mineva et al.

Other ways to get around the gamma-flash problem? Segmented germanium detectors and digital electronics for each individual segment. EURYSIS 6 x 6 germanium, Surrey/Liverpool/Darebury UK Gamma-Ray Tracking Project.

g-factors from fragmentation isomers Basic idea, put isomer in B-field. Perturbation of gamma-ray angular distribution depends on induced Torque. Rate of precession gives Larmor frequency, which gives g-factor. ‘Wiggles’ in count ratio between different angles from 13/2 + isomer, T 1/2 = 354(2)ns in 69 Cu. Neyens, Georgiev et al. RNB5 conference, in press,. Nucl. Phys. A

BaF 2 ‘fast timing’ data from H. Mach et al. Contribution to ENAM 2001 Allows an ordering of the gammas under isomer from their (~ps) lifetimes.

J. Garces Narro et al. Phys Rev. C63 (2001) Implant fragments into Si strip detector…if N=Z, stop beam for 1second and wait….. BIL gated All T=1 ground states in heavy odd-odd N=Z

Summary and Forward Look New nuclear structure –along N=Z line ( 86 Tc, Chandler et al.) –around 78 Ni ( 78 Zn, Daugas et al.) –from fission fragments ( 136 Sb, Mineva, Hellstroem et al.) –‘terra incognita’ 190 W, 195 Os, 200,201,202 Pt… 170 Dy? (Podolyak, Caamano et al.) Reaction information –Isomeric ratios give estimate of spin input, imply useful tool for high-spin physics (Pfutzner et al). Developments in Techniques –Digital electronics for gamma-flash (eg. 136 Sb) –Gamma-tracking with segmented detectors (Pearson, Dobon et al.) –Fast timing to order gamma-rays in cascade (BaF 2 Mach et a.) –g-factors using TPAD method (Neyens, Georgiev et al.) –Active stoppers for electron conversion ( 72,74 Kr etc. Becker et al.) and beta, alpha, proton decays tags (GREAT). All in the RISING