Status & Future for In-Beam Spectrometers for Tagging at JYFL

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Ferdinand Simon
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1 Status & Future for In-Beam Spectrometers for Tagging at JYFL Department of Physics, Finland

2 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).

3 Contents JUROGAM Tagging for In-Beam Spectroscopy Future Developments (2008 onwards) JUROGAM II SAGE LISA

4 JUROGAM ( ) 43 Anti-Compton suppressed HP-Ge detectors (ε ph = 4.2% / 1.3 MeV) JYFL Host Laboratory for ex- EUROBALL detectors Comprises of all EB Phase I + GASP detectors. UK-France loan pool completes the array

5 How to do what we do

6 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

7 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

8 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, (2005) Detection & coincidence efficiency

9 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

10 JUROGAM & Friends

11 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

12 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

13 JUROGAM Campaigns Campaign 1 4/ /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

14 JUROGAM Milestone 2007 Fully Instrumented Digital Electronics IPHC / Orsay (FR) Collaboration Spring 2008

15 The next step BEAMS TARGET ARRAY DAQ GREAT RITU / MARA

16 JUROGAM II : 2008 Efficient and versatile spectrometer ε ph 4.2 6% Singles efficiency Coincidence efficiency 3 x detector elements

17 JUROGAM -> JUROGAM II

18 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.

19 JUROGAM II Planning JUROGAM end 26 May 2008 Infrastructure June Equipment exchange mid June Electronics tests September Start October 2008

20 SAGE : ¾ Simultaneous Gamma and CE studies

21 SAGE Fundamentals

22 SAGE Fundamentals

23 SAGE Integration

24 SAGE Simulations

25 SAGE Realisation

26 LISA : 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

27 LISA Changing target ~ 7 MeV 58 Ni 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

28 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

29 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

30 Future Plans & Milestones JUROGAM II Upgrade 2008 Free resources Needs extra digital instrumentation SAGE & LISA exploitation JUROGAM II 2008 : A Versatile Array : October 2008 MARA Future Advances JUROGAM JUROGAM (Digital) JUROGAM II SAGE LISA

RITU and the GREAT Spectrometer

RITU and the GREAT Spectrometer Cath Scholey Department of Physics University of Jyväskylä 19 th March 2006 3rd TASCA Detector Group Meeting, GSI Darmstadt C. Scholey (JYFL, Finland) RITU and the GREAT