1. Facilities for Nuclear Physics Research at IUAC, New Delhi
R. P. Singh
IUAC, New Delhi
19-21 Feb 2014
ANPhAS-VECC

2. Inter University Accelerator Center (IUAC)
formerly Nuclear Science Center
19-21 Feb 2014
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3. 15 MV Pelletron Tandem Electrostatic Accelerator
Multi-cathode SNICS ion source
SF6 insulating gas ~ 7 atm. pressure
Carbon foil and Gas stripper
Mass analysis and Energy analysis
DC and Pulsed beams
E ~ few MeV per nucleon
Large number of ion-species
Accelerating Column
19-21 Feb 2014
ANPhAS-VECC

4. Superconducting Linear Accelerator : LINAC
3 modules of 8 resonators each
Solid Niobium based SC cavities
(only one of this kind in our country)
RF accelerating field ~ 97 MHz
Operated at liquid helium temp. ~ 4 K
Indigenous capability
Separate High Current Injector (HCI) planned
( High Tc SC based ECR Ion source giving multiply charged ions (first of its kind in the world)
Capable of doubling energy of ions from Pelletron
Assembled RF cavities
19-21 Feb 2014
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5. Ion energies from IUAC accelerator systems
19-21 Feb 2014
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6. Experimental setups for nuclear physics
Gamma Detector Arrays : GDA and INGA for gamma ray spectroscopy
Mass Spectrometers : HIRA and HYRA: Transfer, fusion and Filter
Neutron Detector Array : NAND : Fusion-fission reaction dynamics
A large Scattering chamber: GPSC : Nuclear reaction studies
19-21 Feb 2014
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7. Gamma Detector Array (GDA)
12 High Purity Germanium (HPGe) dets.
Each detector ~ 23% relative to 3”x3” NaI
Total photo-peak efficiency ~ 1MeV
Peak-to-Total ~ 50%
Total Ge solid angle coverage ~ 5% of 4p
Conjunction with many ancillary devices:
CPDA, Multiplicity filter , Plunger etc.
Main work-horse : 1991 to 2007
GDA at IUAC
Detector angles : 50, 90 and 144 deg. with respect to beam
19-21 Feb 2014
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8. GDA Ancillary devices
Plunger for lifetime measurements in 1ps to 1ns range
Phys. Rev C60 (1999)034311
Plastic phoswich type CPDA
For a and p
14 element BGO multiplicity filter
NIM A (2014)
19-21 Feb 2014
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9. Indian National Gamma Array (INGA) at IUAC
Campaign:
24 Clover HPGe detectors
Total photo-peak eff. ~ 5% at 1.3 MeV
Peak-to-Total 40-50%
Detectors angle: 32,57,90,148,123 deg
Total Ge solid angle coverage ~ 25 %
Indigenous electronics
One of 5 large arrays in the world
IUAC/TIFR/VECC/SINP/BARC/UGCDAECSR A National collaboration
S. Muralithar et al; NIM A 622 (2010) 281
19-21 Feb 2014
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10. In-house Electronics developed for INGA
Clover Module
14 bit ADCs
Clover Power Supplies
ACS Power Supplies
Trigger Module
LN2 Controller
INGA Electronics at IUAC
19-21 Feb 2014
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11. Physics addressed: Role of high 'j' orbitals at high spins
Some recent publications
from GDA,INGA setups
Phys. Rev C 88 (2013)024313
Phys. Rev C 88 (2013)054306
Phys. Rev Lett (2014)
Phys. Rev C 88 (2013)034303
Phys. Rev C 87 (2013)034321
Pramana 79 (2012) 403
Int. J. Mod. Phys. E20 (2011)
2133
Role of high 'j' orbitals at high spins
Shape co-existence
Triaxiality in nuclei
Magnetic and anti-magnetic rotational bands
Chirality in nuclei
Octupole collectivity in nuclei
Evolution of shell structure
Incomplete fusion studies
19-21 Feb 2014
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12. Mass Spectrometers at IUAC
1. HIRA : Heavy Ion Reaction Analyzer
2. HyRA: Hybrid Recoil mass Analyzer
19-21 Feb 2014
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13. Heavy Ion Reaction Analyzer (HIRA)
NIMA 339 ('94) 543
Acceptance: msr
E/q accept:
+-20%
A/q accept:
+- 5%
A/A:1/350
Roation:
Max. 25o
MWPC + IC at Focal plane
One of 4 recoil mass spectrometers of this kind in the world
Excellent primary beam rejection at 0o (~ 1010 or better)
Mass spectrum at focal plane position sensitive detector
19-21 Feb 2014
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14. HIRA-INGA-CPDA setup at IUAC
Mass gated gamma spectra for
masses 80, 82 and 83 amu
Mass tagged gamma ray spectroscopy
19-21 Feb 2014
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15. Isomer decay studies at focal plane of HIRA
Ideal for micro-second isomers – Flight time of ERs in HIRA
Excellent, background-free region – Focal plane of HIRA
Mass selected ERs stopped in catcher foil and delayed gamma
transitions recorded using gamma detector at focal plane
PRC 70 (2004)
A. Chakrabarty et al; PRC 70 (2004)
19-21 Feb 2014
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16. First RIB production in India
7Be RIB parameters:
Method: p(7Li,7Be)n
Inverse Kinematics
Purity > 99 %
Energy ~ 12 to 21 MeV
(1 MeV spread)
Intensity ~ 103 – 104 pps
Size ~ 4 mm (FWHM)
Dq,  ~ +/- 30 mrad
Rotating target
Gas cell
J. J. Das et al. NIM B 241 (2005) 953
19-21 Feb 2014
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17. HYRA Spectrometer / Separator
Dual mode Dual stage
1st stage : Gas filled opertn
For A ~ 200 amu
1st and 2nd stage: Vacuum mode: For A ~ 100
Inverse kinematics
Stage 1 is operational
Stage 2: Q6Q7-ED-MD3-Q8Q9
16O + 194Pt at 104 MeV
Beam rejection ~ 1012
Stage 1 of HYRA separator
Madhavan et al; Pramana 75 (2005) 317
19-21 Feb 2014
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18. Focal plane detection system
Residues
Si Resistive/Strip detector Removable stopper MWPC mm Mylar foil
19-21 Feb 2014
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19. Spin Spectrometer (TIFR) coupled to HYRA (IUAC)
Angular momentum distribution in heavy nuclei formed by fusion reactions
Unique setup of gas-filled separator coupled to gamma multiplicity setup
Experiments of this type done only in IUAC now – Russian collaborative expt. (planned)
NaI crystals covering about 85 % of 4p
Also used for spin gated GDR studies
G.A. Kumar et al; NIM A 611 (2009)76
EPJA Web Conference - FUSION11, Vol. 17, 14003
[EPJA Web Conference - FUSION11, Vol. 17, 16007
Nuclear Physics A, Volumes 890–891 (2012) 62-76]
19-21 Feb 2014
ANPhAS-VECC

20. Some recent studies using HIRA/HYRA :
Fission survival of ERs by shell stabilization
V. Singh et al., accepted in Phys. Rev. C (2014)
G. Mohanto et al., Phys. Rev. C 88, (2013)
S. Nath et al., Phys. Rev. C 81, (2010)
Dissipative dynamics in fission
E. Prasad et al., Phys. Rev. C 84, (2011)
P. D. Shidling et al., Phys. Rev. C 74, (2006)
Effect of angular momentum on ER formation
G. Mohanto et al., Nucl. Phys. A , 62 (2012)
S. Nath et al., Nucl. Phys. A 850, 22 (2011)
Multinucleon transfer around the barrier
S. Kalkal et al., Phys. Rev. C 83, (2011)
Channel coupling effects in fusion
S. Kalkal et al., Phys. Rev. C 81, (2010)
19-21 Feb 2014
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21. General Purpose Scattering Chamber (GPSC) and
National Array of Neutron Detectors (NAND) facilities at IUAC
19-21 Feb 2014
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22. General Purpose Scattering Chamber (GPSC)
A Time of Flight (TOF) set up inside
1.5 m dia GPSC
Two large area 20cm x10 cm MWPC
Time and position(x,y) measurements
Fission fragment mass distribution studies.
Pulsed beam for TOF measurement.
Detect two fragments in coincidence
19-21 Feb 2014
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23. Fission fragment Angular distribution measurements using charged
particle detectors inside GPSC
DE-E detector telescope
Thin silicon detectors or Gas ionization detector
Charge particle detectors on the arm of GPSC
19-21 Feb 2014
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24. Neutron Detector Array Facility (NAND):
Array of 100 detectors
Liquid scintillators 5”x5”
Coupled to 5” PMTs
At 1.75 m from Target
Chamber dia about 1 m
50 detectors installed
Sugathan et al; Proc. Int. Conf. On Curr. Prob. In Nucl. Phys. (Ukraine)
19-21 Feb 2014
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25. Research Program with Neutron Detector Array
Measure neutrons in coincidence with fission fragments
Extract pre-scission and post-scission neutron multiplicity at high Excitation energy.
Study of multiplicity distribution using large array.
Two MWPC detectors
Inside the chamber
19-21 Feb 2014
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26. Some recent studies using NAND/GPSC setups:
Effect of shell closure on nuclear dissipation : Phys. Rev. C 86 (2012)
Quasi-fission : Phys. Rev. C 81 (2010)
Entrance channel effect in fission : Phys. Rev. C 80 (2009)
Nuclear dissipation : Phys. Rev. C 80 (2009)
19-21 Feb 2014
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27. Summary
Major facilities at 15 UD Pelletron + LINAC accelerator lab IUAC, New Delhi, for nuclear physics research are:
Gamma Detector Arrays : GDA and INGA setups
Mass spectrometers: HIRA and HYRA (hybrid)
Array of neutron detectors : NAND
General purpose scattering chamber: GPSC
These facilities have been used heavily by Indian and foreign nuclear physicists to address vital problems of current interest.
19-21 Feb 2014
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28. THANKS for your Attention
Qutub Minar, New Delhi
19-21 Feb 2014
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29. Power Supplies & Controllers designed/developed at IUAC
(Import Substitution, Technology transfer, New Features, Easy Maintenance, ..)
Quadrupole Power Supplies (300 A and 100 A) with excellent current stability
Input Gate Output Register
Clover HPGe bias supplies
BGO bias supplies
Power Supply controllers
19-21 Feb 2014
ANPhAS-VECC

30. Superconducting Quadrupole Doublet
To increase angular acceptance of HYRA by a factor of ~ 2.5
Increase in transmission efficiency of HYRA, as a result
Designed at IUAC with help from NSCL, MSU (USA)
19-21 Feb 2014
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31. 19-21 Feb 2014
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