SLIDE 1
In-trap spectroscopy with MLL trap
- A. Lopez-Martens
Charting Terra Incognita
Outline
- Why in-trap spectroscopy ?
- MLL trap
- Perspectives @ S3
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 - - 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
SLIDE 2
SLIDE 3
High-quality spectroscopic data
238U(22Ne,5n)255No
- F. Hessberger et al., Eur. Phys. J. A29 (2006) 165
Stop detector
ToF
g
e- a
ER
e-
248Cm(12C,5n)255No
Asai et al., Phys. Rev. C 83 (2011) 014315
Si PIN photodiodes
18 x 18 mm2
Ge Ge
Pb shield Stepping motor
Gas-jet transport
Rotating wheel
120 µg/cm2 PET
Catcher foils ( x 40) Vacuum chamber
261Rf,257No
- M. Asai, F.P. Hessberger and A. Lopez-Martens
- Nucl. Phys. A 944 (2015) 308
SLIDE 4
Matterless spectroscopy of purified species
V alpha-particle energy
detector
B
e- a
detector
electron-particle energy
- L. Weissman et al., Nucl. Instr. and Meth A 492 (2002) 451
- J. Rissanen et al., Eur. Phys. J. A 34 (2007) 113
SLIDE 5
Possibility of measuring lifetimes of states following a decay ?
a decay 2+-0+ transition Distance travelled between 2 events depends on the lifetime
- f the 2+ state
On the Fine Structure of Alpha Decay, Bohr, Fröman and Mottelson (1955)
t(2+) gives acces to the intrinsic quadrupole moment Q0
1) Decay of 2+ states in deformed nuclei
SLIDE 6
2) Decay of 0+ states
190Po
t(0+) gives acces to the monopole strength r2(E0)
PROLATE OBLATE SPHERICAL
186Pb
- A. Andreyev et al. Nature 405 (2000) 430
SLIDE 7
Challenge
Can we measure such small distances (~ 50 µm for 100 ps) ?
SLIDE 8
The idea: novel recoil-distance method
a
Image by F. Herfurth
- C. Weber et al., International Journal of Mass Spectrometry 349–350 (2013) 270–276
- P. Kruit and F.H. Read, J. Phys. E: Sci. Instrum. 16 (1983) 313
SLIDE 9
Maier Leibnitz Laboratory trap
2cylindrical traps Mass measurement tower MLL trap @ Munich B= 7 T
V.S. Kolhinen et al., Nucl. Instr. Meth. A 600 (2009) 391
SLIDE 10
- C. Weber et al., International Journal of Mass Spectrometry 349–350 (2013) 270–276
MLL trap
Spectroscopy tower
SLIDE 11
Status
Trap moved from Munich to Orsay (see Enrique Minaya’s talk) Simulations of the spectroscopy trap underway (Pierre Chauveau)
SLIDE 12
Status
Goal: detailed simulations of ions and decay in the trap to validate the concept
SLIDE 13
Perspectives @ S3
50# 100# 150# 200# 250# 300# 238Pu# 240Pu# 242Pu# 244Pu# 246Pu# 242Cm#244Cm#246Cm#248Cm#250Cm# 248Cf# 250Cf# 252Cf# 250Fm#252Fm#254Fm#256Fm# 252No#254No#
2+#life(me#(ps)# Nucleus##
life5me#6#Herzberg# life5me#6#Raman# life5me#6#exp.#
SLIDE 14
Perspectives @ S3
- Ch. Theisen, P.T. Greenlees, T.-L. Khoo, P. Chowdhuyr and T. Ishii, Nucl. Phys. A 944 (2015) 333