Charting Terra Incognita of Exotic Nuclei S Franchoo
Charting Terra Incognita of Exotic Nuclei
S Franchoo
PolarexC Gaulard
MLLtrapA Lopez-Martens
MLLtrapE Minaya Ramirez
LinoD Yordanov
RFQ-CBE Minaya Ramirez
CoordinationM MacCormick
Transfer beam lineL Perrot & A Said
Industrial R&DE Minaya Ramirez
Project supportV Poux
S3B Sulignano
Reaching Terra Incognita of Exotic Nuclei
CoordinationS Franchoo & A Said
PolarexC Gaulard
Charting Terra Incognita of Exotic Nuclei
Electron linac10 μA, 50 MeVA, 50 MeV
238UCx target & ion source
1011 photofissions / s
Mass separatorΔM/M~1500M/M~1500
LinoMLLtrap & Polarex
S Franchoo, EPJ Web of Conferences 193 (2018)
—5—
● nuclear structure: μ, δ● weak interaction: limits on CA and CT
● solid state physics: Bhf, relaxation time
Polarex
Low Temperature Nuclear Orientation● spin-orientation of implanted exotic nuclei● 100 T hyperfine field of ferromagnetic host● 7 mK 3He–4He dilution refrigerator
● Collectivity from N=40 to N=50: the g9/2 mid-shell in 77Ge (D Verney et al)● Magnetic moments of Sb and I isotopes close to 132Sn (G Simpson et al)● Orientation of 137I and decay of excited states of 137Xe (N Stone et al)
- Magnetic dipole moment of 137I- Parity admixture in excited states of 137Xe- Beta-delayed neutron emission from 137Xe
Off-line commissioning
6
MLLTRAP
POLAREX
FaisceauALTO
MLLTRAP
POLAREX
Tubecryo
Cagedefaraday
Iris
SteererQuadripoletriplet
Défle
c
t eur90°(Objetdelademande)
VersMLLTrap
POLAREX
FaisceauALTO
P2IOinstallation 2019
ANR + IN2P3done
ERM U-PSud done
BEDO
Sesame installation 2020
Sources obtained from d+56,57Fe● geometry and solid-angle correction
S Roccia et al, NIM A 859, 18 (2017) ● magnetic moment of 56,57Co
A. Etilé et al, EPJ Web of Conferences 66 (2014) & PhD A Etilé (2014)
● multipole mixing ratio of 57,58Fe R Thoër et al, Acta Physica Polonica B 50 (2019) & PhD R Thoër
Off-line commissioning
2019-2020● installation vertical beam line● magnetic moment of 139Ce
2020-2021● installation horizontal beam line● on-line experiments
MLLtrap
59° bender
RFQ-CB 35° bender
Beammanipulation Beam
preparation
90° bender
Beam transport
double Penning-trapmass spectrometer
Beam preparation
Installation done
Installation in progress
90° deflector59° deflector
M2
M3
Call for tender in progress
M1
Installation done
59° bender
● Aug-Dec 2019 : installation of M3 ● October 2019 : call for tender for M2 ● Feb-Jun 2020: installation of M2
Beam preparation
90° bender
● ion trajectories simulated● off-line ion source installed and
tested at low energy (~100 eV)
90° bender
FC + MCP ion source
R&D with Caylar on a new probe for magnetic-field variations during on-line measurementsrequired modifications around the vacuum tube and free access to the bore the Quantum Well Hall Sensor covers 0.5 mT to 7 T final prototype will be tested Dec 2019 at MLLtrap
The Quantum Well Hall Sensor covers 0.5 mT to 7 T
Industry partnership
measurement trap
Purificationtrap
TOF-ICR PI-ICR
delay-line MCP
October 2019: call for tender for delay-line MCP E Minaya Ramirez et al, NIM B, accepted April 2019
2020: on-line commissioning on silver isotopes towards the N=82 shell closure PhD E Morin
Mass measurements
purificationtrap detector trap
Intra-trap spectroscopy
separation enlarged by magnetic fieldcontains τ of excited state
electrons generated by shake-off, Auger, internal conversion
segmented silicon array
position-sensitive detector
Closed
Open
● simulation of the spectroscopy traps done● tender for mechanics obtained● call for tender for gold plating is open
Intra-trap spectroscopy
P Chauveau et al, NIM B, accepted April 2019
cylindrical trap detector trap
● recoil-distance method demonstrated with simulated trajectories ● intra-trap silicon detectors to be tested soon● use delay-line MCP from mass measurements as fringe-field electron detector
● 2020: off-line commissioning with 223Ra source → 219Rn → 215Po● 2021? on-line with fusion-evaporation source 172Yb+28Si → 196Po → 192Pb
Input t1/2
= 300 ps
Lino
Laser-Induced Nuclear Orientation● δ<rr2>● µ, Q moments ● spins
post acceleration& neutralization
fluorescence detection
laser and ion beam coupling
Beam diagnostics and handling
Off-line commissioning
2019: beamline constructed &commissioned with stable Na I
Off-line commissioning
scanning voltage
IPN Orsay, Cern Isolde, MPI-K, U Leuven, Eli-NP
Oct 2019: stable Na beam
3p 2P1/2
Na I
589
nm, 6
×10
7 s-1
3s 2S1/2
2021? β-delayed γ-detection set-up
b scintillation detectors
g scintillation detectors
HPGe
magnet & implantation crystal
polarized beam
g
b
On-line commissioning
2020: updated physics programme to be presented to Alto programme advisory committee
Transfer to Ganil at the earliest 2023
Lino
Outlook
linac
NFSS3
Desir
Gan
il
product
ion
A/Q=7
A/Q= 2
& 3
S3 spectrometer
● Sirius● Season (low-energy branch)
DSSD 128x128 strips300 µm thick
Low gainresolution
65 keV
High gainresolution
16 keV
Linearity <1.5%
Dead time 2.5 µs
floating-point charge sensitive amplifier
16 Numexo-2 + 4FADC-DAQ
10 cm
10 cm
Test with α & electron source● digital signal processing with pulse-shape analysis● test low & high gain with pulse generator at different temperatures
α source (239Pu, 241Am, 244Cm) FWHM 16 keV @ 6 MeV
electron source (133Ba) FWHM 16 keV @ 300 keV
J Kallunkathariyil & B Sulignano
Sirius
Sirius: Spectroscopy and Identification of Rare Isotopes Using S3
beam
5 silicon detectors for short-lived decays1 mm thick to stop electron and α particles
2 germanium detectors
implantation foils20 μg/cm2 carbonon rotating wheel
2 silicon detectors for long-lived decays1 mm thick to stop electron and α particles
Season: Spectroscopy of Electron & Alpha in Silicon bOx couNter for laser spectroscopy at S3
● laser spectroscopy & mass spectrometry of heavy nuclei in supersonic gas jet
● charge radii, electromagnetic moments, spins● shape parameters, single-particle configurations● conversion electrons and alpha decay
T Goigoux & M Vandebrouck
● Monte-Carlo simulation of detection efficiencyα at 8 MeV: 90% e- at 100 keV: 60%
● losses due to electron summing● simulation of known case of nobelium
Season
Charting Terra Incognita of Exotic Nuclei
● surpass limitations of β-decay through access to other variables● Polarex, MLLtrap and Lino under commissioning at Orsay 2019-2020● Lino ready for silver experiment once Alto is available● MLLtrap and Lino to be moved to Ganil-Desir not before 2023● Sirius & Season detector development for Ganil-S3
● additional funding for MLLtrap acquired from ERM, Sesame, ANR Tulip
● ... if exotic beams are not accessible, opt for high precision instead?
Conclusions
CoordinationS Franchoo, A Said
PolarexC Gaulard, F Didierjean, F Le Blanc, I Matea, A Segovia, R Thoër, D Verney
MLLtrapE Minaya Ramirez, M MacCormick, E MorinA Lopez-Martens, P Chauveau
LinoD Yordanov, L Vazquez-Rodriguez
S3B Sulignano, A Drouart, Z Favier, T Goigoux, J Kallunkathariyil, M Vandebrouck
Design & instrumentationJ-M Dufour, S Hervé, A Limongi, G Mavilla, L Perrot, H Ramarijaona, L Vatrinet
Collaboration
2006-2010 ANR JCJC 150 k€ Postdoc, déménagement Canada, upgrade matériel
Depuis 2011 IN2P3 ~90k€ 30k€ structure à ALTO, 20k€ installation à ALTO, 5 à 8 k€/an pour le fonctionnement
2016-2019 Projet Emblématique – Labex P2IO
175 k€ ½ bourse de thèse (R. Thoer), construction de la ligne de faisceau verticale
2018 ERM – Université Paris-Sud
26,2 k€ Construction du déflecteur 90°
2018 SESAME – Ile de France
580 k€ Construction de la ligne de faisceau horizontale
Polarex
MLLtrap
- 2 year CNRS postdoctoral position 2017-18
- Computing equipment 2.8 kE-
- Adaptor flange, contacts and tools for tests of in-trap Si detectors 2.3 kE-
- postdoc extended with remaining equipment money at CSNSM 25 kE for 6 months till June 2019
- 30 kE transferred from Irfu for mechanics of the spectroscopic tower (15 kE spent)
100 kE CNRS postdoc, 30+30 kE equipment
IPNO; 40.79%
P2IO; 36.35%
IN2P3; 21.22%
UPS; 1.64%
Lino