1. Poland@ISOLDE Nuclear physics in Poland and plans related to ISOLDE
Marek Pfützner
ISOLDE Collaboration Committee Meeting, CERN, November 4, 2014

4. Some history
● – Poland was the only country from behind the Iron Curtain having the oficial „observer” status at CERN
● July 1, 1991 – Poland becomes a member of CERN
● early 90’s(?) – Poland became a member of ISOLDE (W. Kurcewicz), after two years the funding was refused
 2004: 50 years of CERN – a review by W. Kurcewicz lists 50 papers from ISOLDE experiments coauthored by Polish physicists
 Some projects initiated and lead by scientists from Poland (before 2004):  Octupole deformation in actinides (IS322 – W. Kurcewicz)  New neutron-rich isotopes of bismuth, lead, and thallium (IS354 – K. Rykaczewski)  Search for detour transitions in REC decay of 81Kr (IS355 – M. Pfützner)  Coulomb excitations of neutron-rich 88Kr beam (IS424 – J. Iwanicki)

5. Where we are
In 2007 we were about 330 people active in nuclear physics
Szczecin University
University of Warsaw  Faculty of Physics  Heavy Ion Laboratory
 National Centre for Nuclear Research
 University of Łódź
Maria Curie-Skłodowska University, Lublin
 Institute of Nuclear Physics (PAN) Jagielonnian University
University of Silesia

6. Miniworkshop on Polish membership in CERN- ISOLDE
Miniworkshop on Polish membership in CERN- ISOLDE
Heavy-Ion Laboratory, Warsaw, May 23, 2014
A consortium was set up and all signatures under the agreement were collected October 1, 2014
Institute of Nuclear Physics, Kraków  Bogdan Fornal
National Centre for Nuclear Research, Warsaw  Henryk Mach
University of Łódź  Józef Andrzejewski
University of Warsaw Heavy Ion Laboratory  Katarzyna Wrzosek-Lipska Faculty of Physics  Marek Pfützner

7. Cluster transfer reactions for gamma-ray yrast spectroscopy
Bogdan Fornal
Institute of Nuclear Physics, Polish Academy of Sciences
Krakow, Poland
A new method for gamma-ray spectroscopic studies of yrast and non-yrast structures in neutron-rich nuclei. It relies on the triton transfer process induced by radioactive beams on a 7Li target.
AX + 7Li A+3-xY+α+xn Z
Z+1 AX
A+1Y
7Li  
~2º n Z
Z+1

8. Gamma spectroscopy of n-rich 98,99Sr nuclei by the incomplete fusion
reaction of 98Rb on 7Li: introduction to HIE-ISOLDE studies
- experiment with MINIBALL + T-REX at REX-ISOLDE
Spokespersons: Bogdan Fornal (Kraków) and Silvia Leoni (Milano)
Collaboration: IFJ PAN Krakow – Univ. Milano - SLCJ Warsaw – ISOLDE CERN
Reaction:
98Rb MeV/A
IS536
Detection system:
MINIBALL + T-REX
Coincidencec between g rays and a particles
Results:
Transfer of tritons into 98Rb, with emission of alpha particles, has a sizeable cross- section as predicted by DWBA calculations.
By tagging on a particles one obtains clean g-ray spectra from triton transfer products.
Yrast, near-yrast and non-yrast states are populated.

9. 98Rb(60%)/98Sr(40%) (2.84 MeV/u) + 7LiF (1.5 mg/cm2)99 Sr Y 98 98 Sr Rb 98
IBEAM (98Ru/98Sr) ≈ 2.5 x 104 pps
Counting rate:
~0.03 ev/s for a-g
(10 k in 4 days)
S. Bottoni et al, to be published, and S. Bottoni, PhD Thesis

10. A new proposal has been submitted to ISOLDE INTC:
„Spectroscopy of particle-phonon coupled states in 133Sb
by the cluster transfer reaction 132Sn on 7Li:
an advanced test of nuclear interactions”
Spokespersons: Silvia Leoni and Bogdan Fornal
132Sn + 7Li Sb+α+2n
P-419 presented tomorrow 2n
133 Sb
132 t Sn

11. Ultra fast timing studies on exotic nuclei (at ISOLDE)
by Henryk Mach, NCBJ
for the Fast Timing Isolde Collaborations

12. Basic Principles of Ultra Fast Timing (Advanced Time-Delayed Method)
beta β
The range for the measurements is from 30 ps to 30 ns (or longer) by the slope method and down to about 5-10 ps by the centroid shift method, see H.Mach et al. Nucl. Phys. A523 (1991) 197.

13. IS322 - IS386 Ra - Ac octupole region IS441 134Sn, 136Sn decays IS386
Mn decay
IS386
Ba octupole region
IS322 - IS386
Ra - Ac octupole region
IS414
Mg island of inversion
IS441 (2009)
81,82Zn decays
IS441
134Sn, 136Sn decays
IS317
76Rb to 76Kr decay
→ 135Sb structure
→ 136Te: B(E2, 2+ → 0+) 13

14. Lifetime of the 2+ state in 32Mg
Centroid shift technique using a two gamma ray cascade involving beta and keV gammas.
Detector calibration for BaF2 at energies close to a y 885 keV, and cascading via levels of precisely known lifetimes :
88Rb ( keV)
30Al ( keV)
24Na ( keV)
Triple coincidence:
Beta-Ge-Ge
Beta-Ge-BaF2(t)
Beta-BaF2(t) time spectra gated by Ge energy 14

15. B(E2)’s for Mg isotopes ATD Low E CoulEx, Timing Intermediate E CoulEx
[from O. Niedermaier]
Low E CoulEx, Timing
Intermediate E CoulEx
ATD 15

16. IS474
IS579
P-429 presented tomorrow

18. Evolution of collectivity and shape coexistence
Analysis of ISOLDE Coulex experiments: GOSIA code
GOSIA: most widely used code for low-energy Coulex
T. Czosnyka et al., Bull. Am. Phys. Soc. 28 (1982) 745
Strong involvement of HIL Warsaw in Coulex data analysisof numerous ISOLDE experiments
Shape coexistence
Hg, Po, 188,190Pb
Oblate shapes
140,142Sm
Evolution of collectivity and shape coexistence
96,98Sr, 93-99Rb, 94,96Kr
MINIBALL: 8 triple clusters
2+1 → 0+1
4+1 → 2+1
2+2 → 0+1
Kα (Hg)
Kβ (Hg)
112Cd recoil
(2+1 → 0+1)
E2 matrix elements between
yrast and non-yrast states up to 4+
quadrupole moments of the 2+ states
shape parameters of the low-lying states
degree of mixing between low-lying
states
182Hg
Bree et al., Phys. Rev. Lett. 112 (2014)
K. Wrzosek-Lipska, M. Zielińska, P. Napiorkowski

19. GOSIA - semiclassical Coulomb excitation codes
Developed and supported at Rochester, Warsaw, and Köln.

20. GOSIA Workshop, HIL, Warsaw
1st GOSIA Workshop EURONS
2nd GOSIA Workshop ENSAR
27 participants form 15 institutes 9 ISOLDE users
Program
12 presentations: examples of COULEX analysis
3 working groups for hands-on session: practice with the GOSIA code dedicated session for ISOLDE users
round-table discussion: users needs to GOSIA development.

21. Future: 182,184Hg cont.
Future: 180,182Hf
P-???
IS562

25. P-429 presented tomorrow
M. Madurga, S. Paulauskas

26. Conversion electron spectroscopy
Jarosław Perkowski
University of Łódź

27. ULESE (University of Lodz an electron spectrometer )

28. Efficiency of the spectrometer

29. Electrons from 184Pt

30. TPC with optical readout
Trigger
Recording system p
charge
amplification e
ionization electrons
light
HV electrodes
counting gas at atmospheric pressure
incoming identified
ion
gating electrode
CCD
PMT
6He
31Ar ?

31. Probing the neutron halo of 6He using the Warsaw Optical Time Projection Chamber (OTPC)
Weak decay branch (10-6) 6He  a + d provides insight into the 2n halo of 6He
Bunches of 6He ions were delivered by REX-Isolde and implanted into the OTPC
Clear images of decay events with tracks of an a particle and a deuteron were recorded by a CCD camera
Detailed analysis is in progress
ISOLDE, August 2012
Anthony
Raabe
Preliminary!

32. b decay of 8He @ Dubna CCD Q = 4.3 MeV PMT
Ea = 1150 keV Et = 2570 keV En = 610 keV
We see about 400 triton events. The branching for the bt is 0.9 %

33. Thank you!
The consortium is planning to apply to the Polish National Science Centre for funding our membership in ISOLDE. We hope to become a member again…