Status & Future for In-Beam Spectrometers for Tagging at JYFL Department of Physics, Finland
Task 1 - Improvement of RDT method (Jyväskylä) Extend the method from α-decay tagging to β-γ tagging, for the study of N~Z nuclei. Requires high granularity and small signal detection. General testing of the method will be carried out using the focal plane spectrometer (segmented Si Ge array). Subtask Focal plane RDT detectors": Extension of GREAT and other focal plane spectrometers to include segmented planar Ge and large clover Ge (Daresbury, Liverpool); extension of the RDT method from a-decay tagging to β-γ tagging (Daresbury, Jyväskylä, Liverpool); conceptual design of ASICs (Saclay). Subtask Prompt radiation spectrometers for RDT": Digitisation of signals from detectors for prompt radiation (Daresbury, Jyväskylä, Liverpool); Development of new prompt radiation spectrometers (Daresbury, Jyväskylä, Liverpool). Subtask RDT detector exploitation : Marry extended GREAT to focal plane of RITU, in-beam testing; provide RITU expertise and accelerated beams (Jyväskylä).
Contents JUROGAM Tagging for In-Beam Spectroscopy Future Developments (2008 onwards) JUROGAM II SAGE LISA
JUROGAM (2003-2008) 43 Anti-Compton suppressed HP-Ge detectors (ε ph = 4.2% / 1.3 MeV) JYFL Host Laboratory for ex- EUROBALL detectors 2003-2008 Comprises of all EB Phase I + GASP detectors. UK-France loan pool completes the array
How to do what we do
Efficiency & Selectivity 192 Po Counts Recoil - γ 176 Pt Yrast Band Gamma-detection efficiency Tagging techniques Isomer tagging Beta-decay tagging Prompt selection Counts Energy (kev) α Recoil - γ Energy (kev) 176 Hg Yrast Band
Heavy Element Spectroscopy Eeckhaudt, Thesis 2006 Detection efficiency Identification of interband M1 transitions: measure of the single-particle g-factor, gk, from gamma-ray intensity ratios
Enhanced vibrational collectivity in light Te istopes? Prompt gamma-rays from 54 Fe( 54 Fe,2n) 106 Te tagged with 106 Te 65µs alpha decay б = 25 nanobarn!! B. Hadinia, et al. Phys. Rev. C 72, 041303 (2005) Detection & coincidence efficiency
Plunger and selection devices Differential plunger inside JUROGAM Grahn et. al Coulex plunger 3 µ 300 µ Harissopulos et. al E(5) X(5) symmetries in 128 Xe Versatile array design
JUROGAM & Friends
Tools of the Trade 2 x 60mm x 40mm DSSD 28 x 40mm x 40mm PIN Diodes 24 x 12 Segmented Planar Ge Compton-Suppressed Segmented Ge Clover Position-Sensitive MWPC Triggerless Data Acquisition System 100 MHz common clock 10 ns resolution 380+ channels timestamped
JUROGAM Physics Programme and Methodology Multiple Shape Coexistence Spectroscopy of Heavy Nuclei Study of Nuclei Near Proton Drip Line Study of Isomeric States Lifetime measurements Beta-Decay Tagging Study of Octupole Deformation
JUROGAM Campaigns 2003-2008 Campaign 1 4/2003 12/2004 : 9 months 14 experiments Campaign 2 4/04-6/04 10/04-3/5 : 9 months 14 experiments Campaign 3 9/2005 9/2006 : 12 months 21 experiments Campaign 4 1/2007 9/2007 : 9 months 12 experiments Campaign 5 4/2008 5/2007 : 2+2 months 6 experiments Next PAC September 2008
JUROGAM Milestone 2007 Fully Instrumented Digital Electronics IPHC / Orsay (FR) Collaboration Spring 2008
The next step BEAMS TARGET ARRAY DAQ GREAT RITU / MARA
JUROGAM II : 2008 Efficient and versatile spectrometer ε ph 4.2 6% Singles efficiency Coincidence efficiency 3 x detector elements
JUROGAM -> JUROGAM II
After considering the resource implications of all requests it was decided to approve the JUROGAM II resource requests as follows: 15+3 Phase I detectors and 15 ACS, 24+4 Clover detectors and 24 ACS. JUROGAM II is encouraged to invest in electronics and ACS for the Clover detectors. The request for 2010 is treated as a letter of intent. The loan is approved until 31/12/09.
JUROGAM II Planning JUROGAM end 26 May 2008 Infrastructure June Equipment exchange mid June Electronics tests September Start October 2008
SAGE : 2008+ ¾ Simultaneous Gamma and CE studies
SAGE Fundamentals
SAGE Fundamentals
SAGE Integration
SAGE Simulations
SAGE Realisation
LISA : 2008+ h 11/2 s 1/2 ~250 0 ~440 ns ~1ns 169 Au ~1920 kev ~2170 kev p 168 Pt Fast charged particle decay modes for tagging
LISA 2008+ Changing target ~ 7 MeV 58 Ni + 106 Cd 156 Lu + 5p + 3n in He in vacuum
MARA Vacuum Separator What kind of research work can be done were the RITU separator is not feasible: Probing the N Z line up to 112 Ba - decay spectroscopy (proton and α-particle decay) at the 100 Sn region - rp-process - proton-neutron pairing interaction - mirror nuclei o study of isospin symmetry breaking o proton skins (N < Z nuclei) - superdeformation and hyperdeformation (N Z 40) Vacuum mode complementary to RITU
Preparations for JUROGAM II 10th of June 2008 : Loading in Strasbourg 11st June 2008 : Loading in Legnaro 16th of June 2008 : Delivery in Jyväskylä 19th of June 2008 : Delivery in Paris
Future Plans & Milestones JUROGAM II Upgrade 2008 Free resources Needs extra digital instrumentation SAGE & LISA exploitation 2008+ JUROGAM II 2008 : A Versatile Array : October 2008 MARA Future Advances JUROGAM JUROGAM (Digital) JUROGAM II SAGE LISA 1.7.2005 30.12.2005 30.6.2006 29.12.2006 29.6.2007 28.12.2007 27.6.2008 26.12.2008 26.6.2009