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