VAMOS Hot results and perspectives * Spectroscopy of
VAMOS Hot results and perspectives * Spectroscopy of n-rich nuclei produced by fission * New gas-filled spectrometer-separator for fusion Getting ready for SPIRAL2 ? Still other results presented by J.Ljungvall and N.Le Neindre C.S. for the VAMOS group LEA COLLIGA, Nov 2009, Paris The VAriable MOde Spectrometer QhQv(WF)DB type optical device under vacuum Pullanhiotan et al., NIM A 593 (2008) 343 focalisation beam dispersion B=AA.v/Q Detection system -> (x,y,Tof,E,Eres)
* Wide acceptance: ~ 60msr, p/p ~ 10% * High selectivity * Versatility * Easy coupling with other detectors (EXOGAM, MUST2,TIARA,INDRA,) C.S. for the VAMOS group LEA COLLIGA, Nov 2009, Paris Prompt spectroscopy of isotopically identified fission-fragments Fission in inverse kinematics 238 U (6.1AMeV) + 12C Goals: FF production yields FF -spectroscopy * One of the two FF enters VAMOS @ 20 * Prompt -rays of both F. Rejmund et al. E516 experiment
FF detected in EXOGAM - Detected FF -> (A,Z,Q,v,,) 2 possible Doppler - Two-body kinematics used to reconstruct corrections ! the velocity vector of the undetected FF Assets of inverse kinematics: - Z identification of heavy FF + Increased acceptance Direct kinematics experiment @ PRISMA+CLARA N.Marginean et al., PRC 80 (2009) 021301 (R) C.S. for the VAMOS group LEA COLLIGA, Nov 2009, Paris Isotopic (Z, A) identification of fission-fragments M.Caamano, F.Rejmund et al., in preparation M More than 300 FF isotopically identified from A~80 to A~150 Z/Z~1/65 A/A~1/160 M/Q Ru
M Xe M/Q C.S. for the VAMOS group M LEA COLLIGA, Nov 2009, Paris Counts/2keV Prompt spectroscopy of the detected fission fragment E (keV) 104 A.Shrivastava et al., PRC (2009) (R) in press Ru 106 109
Ru 107 Ru Ru 108 Ru Ru 110 Ru 111 C.S. for the VAMOS group 112 Ru LEA COLLIGA, Nov 2009, Paris
Prompt spectroscopy of the un-detected fission fragment A.Shrivastava et al., PRC (2009) (R) in press 238 Ru detected Corrected for for corrected Ru U+12C -> Cf* 250 Analyzed pairs from fusionfission : Zr-Ce, Mo-Ba, Ru-Xe, Pd-Te, Cd-Sn Ex: Xe detected Corrected for for
corrected Ru 133 C.S. for the VAMOS group - 133Xe identified in VAMOS - Fission partners (Ru) velocity vector from kinematics Gamma-spectroscopy feasible independent whether the FF LEA COLLIGA, is detected or not ! Nov 2009, Paris Advantage of the direct isotopic identification A.Shrivastava et al., PRC (2009) (R) in press Prompt -ray spectrum in coincidence
with 134Xe in VAMOS Mis-assignment to coincidences 135 Xe via high-fold - States above the 7- (T1/2=A290ms) and 10+ (T1/2=A5s) isomers revealing of the configuration of these C.S. for the VAMOS group Shell model calculation by K.Sieja using new GCN 5082 interaction for Z=A50,N=A82 region LEA COLLIGA, Nov 2009, Paris & * Prompt -spectroscopy of both light and heavy fission fragments can be performed * Significance of unambiguous identification of the fission fragment in a spectrometer
Prompt -spectroscopy of n-rich nuclei spanning a wide range in (A,Z) and with virgin level schemes NB: here only two EXOGAM detectors, thin target, limited I beam C.S. for the VAMOS group LEA COLLIGA, Nov 2009, Paris New gas-filled operation mode for fusion reactions Heavy-ion analyzer mandatory with increasing Ibeam and decreasing s s VAMOS Tasks of the large acceptance spectrometer for 0 operation - Discriminate all open channels (fusion-evap, fission, Coulomb excitation) - Select efficiently the fusion-ERs - Reject the intense incoming beam !!!! How to optimize the use of VAMOS @ 0 ? Beam/ER separation according to Bvacuum sufficient in very asym direct kinematics limited in more sym and inverse kinematics Solution of the gas-filling: Q distribution changes and gets
narrow B ~ A : powerful beam/ER separator larger transmission C.S. for the VAMOS group Gas-filled operation mode of VAMOS for ~ FREE !!! LEA COLLIGA, Nov 2009, Paris VAMOS From vacuum to gas - C foil before the target for vacuum/gas separation - He gas-filling ~1mbar - beam stopper (Ta plate) E,E,Tof He gas Measurement: 40 Ca (196MeV) +
fusion fission ER 250m b 200m b 50mb 150 Sm 190 Pb* ERs identified via decay in Si wall and/or prompt -rays in EXOGAM -radioactive residues (186Pb, 186Hg,185Tl, 187Tl, ) C.S. for the VAMOS group
LEA COLLIGA, Nov 2009, Paris Selection and identification of fusion evaporation residues * Selection -> Direct beam -> Scattered target like nuclei -> Fusion ERs -> Beam scattered from dump Proper selection of the fusion ER * Identification Prompt -radiation Radioactive decay Protons from reactions in the beam dump C.S. for the VAMOS group LEA COLLIGA, Nov 2009, Paris
Performances of the gas-filled VAMOS Scan in B0 and He pressure to optimize beam rejection and transmission Optimal conditions (with present simple set-up): B0=A1.65Tm and p ~ 1mbar Beam rejection factor > 1010 (no direct beam on the detectors for 1.2.1010 Ca sent in 40 VAMOS) Transmission from ion-optics calculations (ZGOUBI) P R E L I M I N A R Y ~ 60% for evaporation channels ~ 90% for neutron channels Large aperture Big detectors Existing gas-filled separators VAMOS CS et al., in preparation
SHIP M.Mazzocco S al., NIMB266(2007)3467 C.S. for the VAMOS group LEA COLLIGA, Nov 2009, Paris & * Feasibility of a gas-filled mode @ VAMOS * Significance for measurements employing fusion in (nearly) symmetric and inverse kinematics the standard with SPIRAL2 heavy RIB NB: Gas-filled set-up not optimized, not ready to be used for physics C.S. for the VAMOS group LEA COLLIGA, Nov 2009, Paris * Vaccum mode - Doubling of the size of the detectors (msr)
Further improvements tomorrow toda y B/B0 * Gas-filled mode - Beam dump farthest and shielded - Differential pumping system ( beam rejection factor) ( transmission) - Recoil Decay Tagging with MUSETT C.S. for the VAMOS group LEA COLLIGA, Nov 2009, Paris
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