Advances in Nuclear Physics Research at AGATA-GRETINA Collaboration Meetings

Cutting-edge research opportunities in nuclear physics using sophisticated devices like GRETINA at ATLAS, focusing on Coulomb excitation, deep inelastic reactions, and transfer reactions for studying neutron-rich nuclei. The installation of GRETINA involves technical support, equipment upgrades, and detector maintenance. Benchmarking and detection efficiency assessments are crucial for optimizing detector performance. Meetings highlight concerns and developments in detector arrays. Language of the content: English.

• Nuclear Physics
• AGATA-GRETINA
• Research Opportunities
• Detector Arrays
• Nuclear Research

kano192 Follow

Uploaded on Oct 06, 2024 | 0 Views

Download Presentation

Please find below an Image/Link to download the presentation.

The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.

Presentation Transcript

1. GRETINA@ATLAS 1st AGATA-GRETINA Collaboration Meeting Shaofei Zhu Physics Division, Argonne National Laboratory

2. Physics Opportunities at ATLAS Coulomb Excitation (Stable/CARIBU, CHICO2) Deep Inelastic Reactions and Transfer/Multi-nucleon transfer reactions to study Neutron-Rich Nuclei (Stable/CARIBU, CHICO2/Phoswich Wall) Proton-Drip Line Nuclei (Stable, FMA) At ATLAS GRETINA with 7 quads and GAMMASPHERE are complimentary devices 2 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

3. Installation of GRETINA at ATLAS GRETINA support; MSU mechanical supporting structure; Existing LN2 system; Existing Oxygen deficiency alarm and LN2 exhaust; DAQ system; Additional power to room G126; Networks from AREA IV (10 GB) and data room (1GB) to G126; Auxiliary detectors electronics and DAQ systems; Rearranged data room for GRETINA on-line data monitoring workstations; Electronics; Rearranging Gammasphere Shack; No loss of capabilities of running Gammasphere/FMA; Detector Maintenance; Existing detector annealing and testing stations; Existing portable crane; 3 2016 Low Energy Community Meeting 08/12/2016

4. Installation of GRETINA at ATLAS GRETINA+CHICOII GRETINA Stand Alone 4 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

5. Benchmarking Gretina Detectors in the Array Concerns: Clean Ground 7 peaks symmetric; 16 peaks show left tail; 1 drifting peak (2-MeV full scale) bad cable Sum peak at 1332 keV: FWHM = 2.58 keV (Gaussian) FWHM = 2.40 keV (Gaussian+left tail) Full Scale = 2 MeV Full Scale = 5 MeV 5 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

6. Benchmarking Gretina Detectors in the Array Tail develops with number of fold: 1 fold is symmetric. No neutron damage. 6 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

7. Gretina Detection Efficiency 7 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

8. Interfacing with Other Detectors Receive timestamp from Master Trigger via SERDES Latch timestamps when remote detector triggers Provide gating logic as necessary with other NIM or ECL signals Add M RIAD to remote detector readout so that events have matching timestamps for event building Send remote detector trigger signals to GRETINA Master Trigger for coincidence. DRAFT JTA MyRIAD Module Specification 4/23/2014 1.5.Board Photo side MASTER A..H ROUTERS MASTER (clock src) 8 T Y P E S Other "Remote" Detectors MASTER "Local" Detector L R U MyRIAD 8 1st AGATA-GRETINA Collaboration Meeting December 5, 2016 page 4

9. CHICO-II and GRETINA Angular coverage: 12o 85o, 95o 168o; 280o in Angular resolution: = 1.6o, = 2.5o Solid angle: ~69% of 4 Energy-loss output: Improved time, mass and Z resolution Time resolution: t 500ps Mass resolution for kinematic coincidence: m/m 5% Q-value resolution: 20 MeV Gammasphere -ray Doppler broadening: 1.0%* GRETINA -ray Doppler broadening: 0.5%* *Average recoil speed around10% of c; Ignores contribution due to intrinsic resolution etc. 9 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

10. Time between CHICO-II and GRETINA 10 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

11. Gretina/Gammasphere Coupled to CHICOII Comparison 623 MeV 136Xe on 0.581 mg/cm2 194Pt Particle single rate up to 500 k/s for the scattering angle between 20o and 85o E (keV) E (keV) t Angle T (10 ns) 11 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

12. Gretina/Gammasphere Coupled to CHICOII Comparison Same Beam Energy, Same Target average = 7.4% Gammasphere Gretina Untracked Gretina Tracked (FOM<=0.8) Gretina Tracked (FOM<=1.0) FWHM: GS: 16.4 keV GT Untracked: 10.4 keV GT Tracked (0.8): 9.7 keV GT Tracked (1.0): 9.7 keV Peak Area Relative to GT Untracked: GS: 1.0 GT Tracked (0.8): 1.26 GT Tracked (1.0): 1.31 12 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

13. Gretina/Gammasphere Coupled to CHICOII Comparison average = 4.6% Gammasphere Gretina Untracked Gretina Tracked (FOM<=0.8) Gretina Tracked (FOM<=1.0) 13 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

14. Experiment Setup for CARIBU Coulomb Excitation Particles angles time of flight -ray spectroscopy Monitoring beam Intensities Impurities PPACs GRETINA Accelerated CARIBU beam from ATLAS HPGe detector at beam dump 1.0 mg/cm2 208Pb target CHICO2 -ray spectrum from decay Rate determined from number of counts for transitions in daughter nucleus taking efficiency and branching ratios Counts into account E (channels) December 5, 2016 14 1st AGATA-GRETINA Collaboration Meeting

15. Experimental results for 146Ba Shaofei Zhu 15 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

16. Deep-inelastic reactions: Gretina + CHICOII -ray and isotope correlations reaction partners m/m 5% Q-value resolution: 20 MeV Sensitive to fast transitions proper Doppler corrections Angular distributions FWHM: 6.32 keV at 885 keV (0.71%) 16 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

17. GRETINA + Phoswich Wall Experiments No. Pixels: 256 (4 PMT s) Thin fast-plastic + CsI(Tl) Angle range: 9 72 Preferred position: downstream 138Ba+13C Experiment: Coupling w/ Gretina and 9 LaBr3(Ce) s Shaofei Zhu 17 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

18. 138Ba + 13C, Elab = 550 MeV (ATLAS) Online analysis Particle gates on so-called A-C maps (similar to E-E gating) 139Ba + 12C products (one-neutron transfer) 142Ce + 9Be products (incomplete fusion) 1000 counts 627 particle gate #1 red = 139Ba 455 642 * 100 counts 579 particle gate #2 green = 142Ce 524 * * * * * contamination (144Nd) E (keV) 18 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

19. 18 PAC-approved experiments 130 days of beam time Shape germanium isotopes72Ge and76Ge coexistence in the neutron-rich Comparison of the performance of the GRETINA and GAMMASPHERE; GRETINA Test: High-Energy Gamma- Ray Performance; Commissioning experiment to study the polarization sensitivity of GRETINA; Octupole Strength in Neutron-Rich Nuclei near A~140: Multi-step Coulomb Excitation of Beams 142,144,146Ba with Reaccelerated CARIBU Shape coexistence in100Zr studied by low- energy Coulomb excitation Fast-timing lifetime measurements in the 13C(138Ba,12C )139Ba and 13C(140Ce,12C )141Ce reactions Multi-Particle-Hole States in neutron rich34P Understanding the Low-Energy Enhancement of the Photon- Strength Function in Nuclei Sub-shell closure, proton-neutron symmetry and shape coexistence in98Zr Precision determination of electromagnetic matrix elements in triaxial110Ru Shape Evolution and Coexistence in the Mo- Ru Region Coulomb Excitation of neutron-rich odd-odd nucleus 98mY 19 1st AGATA-GRETINA Collaboration Meeting December 5, 2016

20. ANL Project Personnel M. Albers, J. Anderson, A. Ayangeakaa, M. P. Carpenter, H. David, C. Hoffman, R. Janssens, B. Kay, A. Korichi, T. Lauritsen, T. Levand, D. Potterveld, J. Rohrer, G. Savard, D. Seweryniak, B. Zanbransky, SZ LBNL: C.M. Campbell, H. Crawford, M. Cromaz, P.Fallon, I-Y. Lee, A.O. Macciavelli, A. Wiens NSCL: D. Weisshaar ORNL: J. M. Allmond, D. Radford Unv. Rochester and LLBL(CHICO2): C. Y. Wu, D. Cline, B. M. Bucher, A. Hayes, R. Fox, D. Swan Wash. U. (Phoswich Wall): W. Reviol, D.G. Sarantites, J. Elson, J. Kinnison 20 1st AGATA-GRETINA Collaboration Meeting December 5, 2016