UNIVERSITY OF JYVÄSKYLÄ RDDS measurements at RITU and prospects at HIE-ISOLDE T. Grahn University of Jyväskylä HIE-ISOLDE Spectrometer Workshop, Lund 10.-11.3.2011.

Slides:

Advertisements

Similar presentations

Present and future limitations of SHE in-beam experiments R-D Herzberg.

Advertisements

Decay- and in-beam spectroscopy of heavy nuclei at the proton dripline Triple-shape coexistence.

Future prospects and needs for nuclear structure studies with high intensity stable beams.

Fast-Timing with LaBr 3 :Ce Detectors and the Half-life of the I π = 4 – Intruder State in 34 P (…and some other stuff maybe..) Paddy Regan University.

March 1, 2013GRETINA workshop Coulomb excitation of even Ru and Mo isotopes Juho Rissanen Nuclear Structure Group, Lawrence Berkeley.

MINIBALL g-ray Spectroscopy far from Stability

Study of single particle properties of neutron-rich Na istopes on the „shore of the island of inversion“ by means of neutron-transfer reactions Thorsten.

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°-

Proton Inelastic Scattering on Island-of-Inversion Nuclei Shin’ichiro Michimasa (CNS, Univ. of Tokyo) Phy. Rev. C 89, (2014)

1 Andreas Görgen EURISOL – EURONS Town Meeting, Helsinki,

Evolution of nuclear shape in the light Radon isotopes Andrew Robinson, David Jenkins, Stewart Martin-Haugh University of York Jarno Van De Walle CERN.

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 Status of digital electronics at JYFL Pete Jones Department of Physics University.

The LISA spectrometer David O’Donnell STFC Daresbury Laboratory.

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

The evolution of nuclear structure in light osmium isotopes; gamma ray spectroscopy of 163 Os and 165 Os Mark Drummond.

Reaction rates in the Laboratory Example I: 14 N(p,  ) 15 O stable target  can be measured directly: slowest reaction in the CNO cycle  Controls duration.

Spectroscopy and lifetime measurements at ReA12 Hiro IWASAKI (NSCL/MSU) 7/12/2014Recoil Separator for ReA12 workshop1.

A LaBr3 Fast Timing Array of NUSTAR detectors at JYFL

Superheavy Element Studies Sub-task members: Paul GreenleesJyväskylä Rodi Herzberg, Peter Butler, RDPLiverpool Christophe TheisenCEA Saclay Fritz HessbergerGSI.

UNIVERSITY OF JYVÄSKYLÄ Lifetime measurements probing triple shape coexistence in 175 Au Tuomas Grahn Department of Physics University of Jyväskylä The.

UNIVERSITY OF JYVÄSKYLÄ Results from the first tests with the SPEDE spectrometer Philippos Papadakis ISOLDE Workshop and Users Meeting 2014.

Wolfram KORTEN 1 Euroschool Leuven – Septemberi 2009 Coulomb excitation with radioactive ion beams Motivation and introductionMotivation and introduction.

GRETINA experiments with fast beams at NSCL Dirk Weisshaar,  GRETINA and fast-beam experiments  Some details on implementation at NSCL  Performance.

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

Reiner Krücken - Yale University Reiner Krücken Wright Nuclear Structure Laboratory Yale University Why do we measure lifetimes ? The recoil-distance method.

Nuclear Astrophysics with the PJ Woods, University of Edinburgh.

Neutron transfer reactions at large internuclear distances studied with the PRISMA spectrometer and the AGATA demonstrator.

Search for two-phonon octupole excitations in 146 Gd Energy Postgraduate Conference 2013 University of Zululand/ University of the Western Cape Nontobeko.

1 In-Beam Observables Rauno Julin Department of Physics University of Jyväskylä JYFL Finland.

W. Korten Nuclear collectivity and shape evolution in exotic nuclei Wolfram KORTEN CEA Saclay DSM/IRFU/SPhN.

Nuclear structure around 100 Sn Darek Seweryniak, ANL.

Nuclear structure around 68 Ni J. Van de Walle, N. Kalantar et al. KVI Groningen Nuclear structure around 68 Ni J. Van de Walle, N. Kalantar et al. KVI.

6th Dec 2011 ISOLDE Workshop, CERN Reaction Dynamics studies with 6,7 Li and 9 Be nuclei at Pelletron, Mumbai, India Vivek Parkar University of Huelva,

Lifetime measurement in 74 Ni: probing the core polarisation around the double magic 78 Ni G. de Angelis, D.R. Napoli, E. Sahin, J.J. Valiente-Dobon INFN,

Fast timing measurements at the focal plane of the Solenogam  -e - spectrometer (and some other ideas…) Greg Lane.

Sep. 2003CNS Summer School Feb 分 => Talk なら 35 枚だが、 lecture だと少なめ？ 50 分 => Talk なら 35 枚だが、 lecture だと少なめ？

Doppler-Shift Lifetime Measurements - The Yale Plunger -

AGATA The Advanced Gamma Ray Tracking Array Ancillary Detector and Integration W.G. Status of the Working Group and Tasks A.Gadea.

LLNL-PRES This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.

Evolution of nuclear shape in the light Radon isotopes Andrew Robinson, David Jenkins, Stewart Martin-Haugh University of York Jarno Van De Walle CERN.

Rauno Julin TA-04 JYUEURISOL-EURONS Town Meeting Helsinki September 2007 Transnational Access to JYFL Accelerator Laboratory, Department of Physics,

Saclay, 30 January 2007 Rauno Julin Department of Physics University of Jyväskylä FinlandJYFL In-beam Spectroscopy of In-beam Spectroscopy of Transfermium.

Probed with radioactive beams at REX-ISOLDE Janne Pakarinen – on behalf of the IS494 collaboration – University of Jyväskylä ARIS 2014 Tokyo, Japan Shapes.

Coulomb excitation of neutron-rich 32,33 Mg nuclei with MINIBALL at HIE-ISOLDE P. Reiter 1, B. Siebeck 1, M. Seidlitz 1, A. Blazhev 1, K. Geibel 1, N.

R&D on complementary detectors and devices for nuclear structure and reaction mechanism studies R&D on complementary detectors and devices for nuclear.

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.

Trends in Heavy Ion Physics Research, Dubna, May Present and future physics possibilities at ISOLDE Karsten Riisager PH Department, CERN

Andreas Görgen INTC Shape Transitions and Coexistence in Neutron-Deficient Rare Earth Isotopes A. Görgen 1, F.L. Bello Garrote 1, P.A. Butler.

REQUIREMENTS for Zero-Degree Ion Selection in TRANSFER Wilton Catford University of Surrey, UK & SHARC collabs.

Dipa Bandyopadhyay University of York

SuperCHICO; a 4π heavy-ion detector C.Y. Wu and D. Cline An arsenal of auxiliary charged-particle detectors must be an integral component of GRETA in order.

RDT Plunger Lifetime Measurements Workshop, GSI 2007 Workshop, GSI 2007 R. Julin -JYFL On behalf of the JYFL-Köln-Liverpool-Saclay-Munich collaboration.

VAMOS « Hot » results and perspectives * Spectroscopy of n-rich nuclei produced by fission * New gas-filled spectrometer-separator for fusion Getting ready.

Shape coexistence in the neutron- deficient Pb region: Coulomb excitation at REX-ISOLDE Liam Gaffney 1,2 Nele Kesteloot 2,3 1 University of the West of.

Reaction dynamics and nuclear structure of moderately neutron-rich Ne isotopes by heavy ion reactions Simone Bottoni University of Milan & KU Leuven INPC.

Technical solutions for N=Z Physics David Jenkins.

Nuclear shape evolution through lifetime measurement in neutron rich nuclei Lucie Grente Colloque GANIL 2013 CEA Saclay, France DSM/IRFU/SPhN September.

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

Shuya Ota: Japan Atomic Energy Agency, Rutgers University H. Makii, T. Ishii, K. Nishio, S. Mitsuoka, I. Nishinaka : Japan Atomic Energy Agency M. Matos,

Georgi Georgiev CSNSM, Orsay, France Nuclear structure studies at the r-process path Coulomb excitation of odd-A neutron-rich Rb isotopes at REX-ISOLDE.

of very neutron deficient heavy nuclei

In-source laser spectroscopy of mercury isotopes (P-424)

International Workshop SDANCA 2015

for the LNL-Ganil collaboration

L. Acosta1, M. A. G. Álvarez2, M. V. Andrés2, C. Angulo3, M. J. G

Systematic study of Z = 83 nuclei: 193,194,195Bi

Recent Highlights and Future Plans at VAMOS

Presentation transcript:

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

UNIVERSITY OF JYVÄSKYLÄ Outline Tagging instrumentation at JYFL Lifetime measurements utilising selective tagging methods at JYFL Plunger device at MINIBALL Plunger device at HIE-ISOLDE spectrometer?

UNIVERSITY OF JYVÄSKYLÄ BACKGROUND AND MOTIVATION Shape coexistence in the neutron-deficient Pb region: large body of spectroscopic information obtained with stable beams but the knowledge of transition probabilities was missing. → Couple the Köln plunger device to JUROGAM + RITU at the University of Jyväskylä (JYFL). 186 Pb & 194 Po: First Recoil Distance Doppler-Shift (RDDS) lifetime measurements employing the RDT technique. Improved lifetime information on 188 Pb using the recoil-gating method (PRL 97, (2006) & NPA 801, 83 (2008)). Demonstrated that RDDS lifetime measurements are possible for such exotic species. → Ongoing programme to study lifetimes in nuclei far from stability. RDDS measurements in the light Pb region are complementary to the Coulomb excitation measurements carried out at REX- ISOLDE. →State lifetimes set constraints in the analysis of Coulomb excitation data.

UNIVERSITY OF JYVÄSKYLÄ Examples of physics cases Shape coexistence: 186,188 Pb, Po, 180,182 Hg, 175 Au, 174,175 Pt, 182 Pt. Transition between deformed and spherical structures: Os. Collectivity and shell evolution above 100 Sn: 108,110 Te, 109 I. Recoil-isomer tagging, e.g. 144 Ho The RITU separator renders it possible to access very neutron-deficient nuclei and RDT method results to a very clean γ-ray spectrum for RDDS studies.

UNIVERSITY OF JYVÄSKYLÄ JUROGAM II Ge+BGO detectors, eff. 6% RITU Gas-filled recoil separator, transmission 20-50% GREAT Focal plane spectrometer TDR Total Data Readout, triggerless data acquisition system with 10 ns time stamping Tagging instrumentation at JYFL

UNIVERSITY OF JYVÄSKYLÄ Recoil-Decay Tagging (RDT) method Beam from K130 cyclotron JUROGAM Ge- detector array RITU recoil separator GREAT spectrometer GREAT DSSD Power of the method: recoiling evaporation residue and its subsequent characteristic decay observed ⇒ unique tag for the prompt radiation.

UNIVERSITY OF JYVÄSKYLÄ RDDS lifetime measurements at JYFL First ever Recoil Distance Doppler-Shift (RDDS) lifetime measurements utilising a gas-filled recoil separator and the RDT technique → a special plunger device with a degrader foil designed by the University of Köln.

UNIVERSITY OF JYVÄSKYLÄ RDDS lifetime measurements at JYFL The Köln plunger device at RITU: –`Standard´ stopper foil replaced by a degrader foil in order to allow evaporation residues to enter RITU. –Moveable target allows the target-to-degrader distance to be varied. –Motors operate in vacuum, therefore it has to be isolated from the He gas of RITU ⇒ C window.

UNIVERSITY OF JYVÄSKYLÄ RDDS lifetime measurements at JYFL Difficulties/limitations Use of the degrader foil: JUROGAM II Ge-detector counting rate increases. With a 1 mg/cm 2 Mg foil, RITU transmission efficiency cut by a factor of 2/3. Doppler-shift difference rather low: v/c = 4%  v/c =3%. Suitable  : Only 15 of JUROGAM II Ge-detectors can be used; 5 at 158  and 10 at 134 . Ge efficiency reduced significantly. Reaction cross section & residue: Measurements down to 50 μb level carried out. The nucleus of interest has to have a sufficient p- or α-decay branch for RDT. If the exit channel of the reaction is dominant, recoil gating will provide a rather clean tag.

UNIVERSITY OF JYVÄSKYLÄ RDDS lifetime measurements at JYFL The DPUNS plunger device –Based on the Köln plunger design, constructed by University of Manchester. –Can operate in He of RITU ⇒ differential pumping. –To be completed in –Dedicated instrument for RITU and MARA.

UNIVERSITY OF JYVÄSKYLÄ Lifetimes in 180,182 Hg Typical TOF-Gas dE spectrum Recoils 96 Mo( 88 Sr,2n) 182 Hg, E=310 MeV. Recoil-gated projections of γγ- coincidence spectra.

UNIVERSITY OF JYVÄSKYLÄ Lifetimes in 180,182 Hg 94 Mo( 88 Sr,2n) 182 Hg, E=300 MeV. RDT singles γ-ray spectra, tagged with 180 Hg α decay, at three target- to-degrader distances.

UNIVERSITY OF JYVÄSKYLÄ Lifetimes in 180,182 Hg High collectivity of the states with I π  4 indicate their prolate deformed character. The results support the shape coexistence of weak oblate and intruding prolate structures Complementary measurements: Coulomb excitation studies of 182,184,186,188 Hg at REX- ISOLDE T. Grahn et al., PRC 80, (2009) Transition quadrupole moments of selected Hg nuclei.

UNIVERSITY OF JYVÄSKYLÄ Plunger device at MINIBALL Project jointly managed by Demokritos Athens and IKP Köln. The plunger device is based on the Köln design. The design process is ongoing.

UNIVERSITY OF JYVÄSKYLÄ Plunger device at MINIBALL Target chamber incorporates the plunger device upstream and the CD Si detector downstream. Experience gained in JYFL experiments with the `CoulEx plunger’ (Köln plunger device + particle detector array).

UNIVERSITY OF JYVÄSKYLÄ Plunger device at HIE-ISOLDE spectrometer? HIE-ISOLDE spectrometer LoI: Several physics cases and methodologies: –Transfer reactions –Deep inelastic reactions –Fusion-evaporation reactions Several experimental scenarios for the plunger device could be envisaged. Plunger device is relatively easy to couple with a separator.

UNIVERSITY OF JYVÄSKYLÄ Plunger device at HIE-ISOLDE spectrometer? Deep inelastic & transfer reactions –Reaction kinematics could be problematic. –However, such studies have been carried out at CLARA- PRISMA, LNL (see e.g. D. Mengoni et al., EPJA 42, 387 (2009)). Fusion-evaporation reactions –Difficulties: low beam intensity, low cross section. –Beam intensity at JYFL usually 1 pnA ⇔ ~10 8 pps, cross sections down to 50 μb. –Similar intensities could be achieved at HIE-ISOLDE, due to the projected intensity increase, for radioactive beams `not so far from stability´.

UNIVERSITY OF JYVÄSKYLÄ Plunger device at HIE-ISOLDE spectrometer? Would provide a complimentary method to Coulomb excitation in measurements of transition probabilities. Not sensitive to reaction mechanism and target excitations. May provide access to measurements of transition probabilities in regions of the nuclear chart otherwise inaccessibly with Coulomb excitation (deep- inelastic/fusion-evaporation reactions).