In-trap spectroscopy with MLL trap A. Lopez-Martens Charting Terra - PowerPoint PPT Presentation

In-trap spectroscopy with MLL trap A. Lopez-Martens Charting Terra Incognita

Outline - Why in-trap spectroscopy ? - MLL trap - Perspectives @ S3

High-quality spectroscopic data ToF 238 U( 22 Ne,5n) 255 No Stop detector F. Hessberger et al., Eur. Phys. J. A29 (2006) 165 a ER g e- e- Rotating wheel Vacuum Gas-jet transport chamber 261 Rf, 257 No Catcher foils ( x 40) 120 µ g/cm 2 PET Stepping motor Pb shield Ge Ge Si PIN photodiodes M. Asai, F.P. Hessberger and A. Lopez-Martens 18 x 18 mm 2 248 Cm( 12 C,5n) 255 No Nucl. Phys. A 944 (2015) 308 Asai et al., Phys. Rev. C 83 (2011) 014315

Matterless spectroscopy of purified species detector a B detector e- V alpha-particle energy L. Weissman et al., Nucl. Instr. and Meth A 492 (2002) 451 electron-particle energy J. Rissanen et al., Eur. Phys. J. A 34 (2007) 113

Possibility of measuring lifetimes of states following a decay ? 1) Decay of 2 + states in deformed nuclei 2 + -0 + transition a decay Distance travelled between 2 events depends on the lifetime of the 2+ state On the Fine Structure of Alpha Decay, Bohr, Fröman and Mottelson (1955) t (2+) gives acces to the intrinsic quadrupole moment Q 0

2) Decay of 0 + states PROLATE SPHERICAL OBLATE 190 Po A. Andreyev et al. Nature 405 (2000) 430 186 Pb t (0+) gives acces to the monopole strength r 2 (E 0 )

Challenge Can we measure such small distances (~ 50 µ m for 100 ps) ?

The idea: novel recoil-distance method C. Weber et al., International Journal of Mass Spectrometry 349–350 (2013) 270–276 a Image by F. Herfurth P. Kruit and F.H. Read, J. Phys. E: Sci. Instrum. 16 (1983) 313

Maier Leibnitz Laboratory trap Mass measurement tower 2cylindrical traps MLL trap @ Munich B= 7 T V.S. Kolhinen et al., Nucl. Instr. Meth. A 600 (2009) 391

MLL trap Spectroscopy tower C. Weber et al., International Journal of Mass Spectrometry 349–350 (2013) 270–276

Status Trap moved from Munich to Orsay (see Enrique Minaya’s talk) Simulations of the spectroscopy trap underway (Pierre Chauveau)

Status Goal: detailed simulations of ions and decay in the trap to validate the concept

Perspectives @ S3 300# 2+#life(me#(ps)# life5me#6#Herzberg# life5me#6#Raman# 250# life5me#6#exp.# 200# 150# 100# 50# 238Pu# 240Pu# 242Pu# 244Pu# 246Pu# 242Cm#244Cm#246Cm#248Cm#250Cm# 248Cf# 250Cf# 252Cf# 250Fm#252Fm#254Fm#256Fm# 252No#254No# Nucleus##

Perspectives @ S3 Ch. Theisen, P.T. Greenlees, T.-L. Khoo, P. Chowdhuyr and T. Ishii, Nucl. Phys. A 944 (2015) 333