SHIPTRAP the Penning trap spectrometer at GSI Ana

SHIPTRAP: the Penning trap spectrometer at GSI Ana Martin JINA 2007, Ana Martin 1

SHIPTRAP = SHIP + TRAP + … SHIPTRAP = Precision experiments with fusion-evaporation reaction products at low energy behind SHIP using ion traps stopping Gas Cell Extraction RFQ target wheel beam dump cooling, accumulation purification measurement Buncher Transfer section Purification Trap Measurement Trap Detector primary beam, 3 -4 Mev/u JINA 2007, Ana Martin 2

Ion Motion in a Penning Trap B Axial motion: oscillation in Efield Magnetron motion: E x B drift Ф 0 Reduced cyclotron motion: axial motion magnetron motion cyclotron motion JINA 2007, Ana Martin 3

Double system Penning trap 185 mm precision mass measurement via the determination of the ion cyclotron frequency 32 mm Pumping barrier 212 mm E Measurement Trap Diaphrag TOF-ICR = Time-of-flight Ion Cyclotron Resonance m Purification Trap buffer gas cooling mass selective (isobaric purification) 111 Te+ 600 ms JINA 2007, Ana Martin 4

Mass measurements in the rpprocess end point region 50 Cr+58 Ni→ 108 Te* @ 3. 6 Me. V/u - 4. 0 Me. V/u 58 Ni+58 Ni→ 116 Ba* @ 4. 0 Me. V/u 40 Ca+58 Ni→ 98 Cd* @ 5. 0 Me. V/u The Sn-Sb-Te cycle Precision mass measurements are important for rp-process calculations JINA 2007, Ana Martin 5

SHIPTRAP collaborators GSI / SHIPTRAP Mainz M. Block Munich K. Blaum D. Beck D. Habs R. Ferrer M. Dworschak J. Ketelaer J. Neumayr S. Eliseev F. Herfurth H. -J. Kluge A. Martín W. Quint C. Rauth G. Vorobjev GSI / SHIP D. Ackermann M. Sewtz C. Weber P. Thirolf H. Backe P. Kunz Greifswald W. Lauth A. Chaudhuri G. Marx Giessen L. Schweikhard M. Petrick C. Scheidenberger St. Petersburg W. R. Plaß Y. Novikov F. P. Heßberger S. Hofmann M. Mazzocco Veterans: D. Rodríguez, M. Mukherjee, S. Rahaman, . . . JINA 2007, Ana Martin 6