Diapositiva 1

1
Experimental studies of exotic nuclei by means of
?-ray spectroscopy
IEM-MAG Magnetic moment measurements using low-
and high-energy stable and
radioactive ion beams
IEM-DEC Decay studies of exotic nuclei
2
History of the group in the last five years
04
05
06
07
08
09
10
año
RyC
Inv. Cient.
UAM
IEM-CSIC
now PostDoc at GANIL
Lucia Caceres Monllor PhD 10/08 UAM PRL 99
(2007) 132501, PRC 79 (2009) 011301(R), PLB 672
(2009) 313 in prep.
Victor Modamio Hoybjor - since 01/06 PRC 77
(2008) 024310, PRC 79 (2009) 024310 2 articles
in prep.
PhDs
DEA
Jennifer Walker - since 08/06, FPU articles in
preparation
FPA2005-00696
FPA2007-66069
The group urgently needs new students to secure
continuity !
new project
Oct. 09
Personal more important than investment money

3
Summary of the scientific output
04
05
06
07
08
09
10
año
RyC
Inv. Cient.
UAM
IEM-CSIC
FPA2005-00696
FPA2007-66069
39 articles in refereed journals (incl. 3 Phys.
Rev. Lett., 7 Phys. Lett. B, 13 Phys. Rev. C etc.)
16 talks at Int. Conferences (incl. 10 invited
talks)
4
IEM-MAG Magnetic moment measurements using low-
and high-energy stable and radioactive ion beams
Why to measure magnetic moments ?
Magnetic moments are very sensi- tive to the
relative proton/neutron composition of the
wavefunctions !
gs? 5.586 gl? 1.0
gSchmidtgl?(gs-gl)/(2l1)
gs? -3.826 gl? 0.0
5
How to measure g-factors of short-lived excited
states ?
populate nucleus in excited state of
interest (spin alignment in reaction
mechanism) Coulomb excitation at low and high
energy/velocity let magnetic moment of the
nucleus experience a transient magnetic field
(TF) ? Larmor precession observe rotation of the
anisotropic angular distribution of the decay
?-ray
2wLt
Needs strong fields, a clean selection and high
?-ray detection efficiency
6
Recently performed magnetic moment measurements
"Magnetic moments of Coulomb excited 2 states
for radioactive beams of 132,134,136Te and 138Xe
isotopes at REX-ISOLDE" REX-ISOLDE - CERN,
Switzerland low-energy
Oct. 2006 Spokespersons A. Jungclaus and K.-H.
Speidel "Measurement of the g-factors of 2
states in stable A112,114,116 Sn isotopes using
the transient field technique" UNILAC - GSI,
Germany
low-energy Nov. 2007 Spokespersons A.
Jungclaus "Measurement of the magnetic moment of
the 2 state in neutron-rich radioactive 72Zn
using the high-velocity transient field
technique" GANIL, Caen, France
high-energy April
2008 Spokespersons A. Jungclaus and G.
Georgiev "g factors and lifetimes in
42,44,46Ar testing shell model interactions and
the N28 shell closure" NSCL - Michigan State
University, USA high-energy
Oct. 2008 Spokesperson A. Stuchbery Magnetic
moment and lifetime measurements on the 2 states
in 120,122,124Sn using Projectile Coulomb
excitation in inverse kinematics" UNILAC - GSI,
Germany
low-energy March 2009 Spokespersons A.
Jungclaus
Madrid Darmstadt Bonn München
Madrid Darmstadt Bonn München
Madrid CSNSM Orsay Canberra Darmstadt
Canberra NSCL/MSU Madrid
Madrid Darmstadt Bonn München
7
U234 and U236 low velocity TF with stable
beams PhD project of Jennifer Walker
Si
112,114,116Sn _at_ 4 MeV/u
65o
Ge
?2o-20o
Coulex of Sn on C C target ions detected in
Si a-transfer 12C (ASn, A4Te) 8Be ? aa a
detected in Si
?23o-38o
10 mm
currently at GSI within the RISING project
4 EUROBALL Cluster detectors
8
Prompt particle gated ?-ray spectra
51o
114Sn
4 ? 2
2 ? 0
65o
79o
5- ? 4
3- ? 2
e-e
counts
118Te
2 ? 0
4 ? 2
22 ? 2
e-e
6 ? 4
E? (keV)
9
Measured precession angles DF
2 ? 0
precession DF (mrad)
1 deg
Sn
no effect
mass number A
1 deg 17.5 mrad !
estimated DF/g 84 mrad
10
g-factors of 2 states in even-even Sn isotopes
U234
PhD Jennifer Walker
March 2009
present
U236
2 g-factor
exp M. Hass et al., PRC22 (1980) 97
neutron number N
shell model, 100Sn core, Hjorth-Jensen
relativistic mean field, Ansari, Ring
shell model, 132Sn core, Brown
quasiparticle RPA, Terasaki
New experiment already approved 90Sr
Darmstadt-Madrid-Sofia
11
Recently performed magnetic moment measurements
"Magnetic moments of Coulomb excited 2 states
for radioactive beams of 132,134,136Te and 138Xe
isotopes at REX-ISOLDE" REX-ISOLDE - CERN,
Switzerland low-energy
Oct. 2006 Spokespersons A. Jungclaus and K.-H.
Speidel "Measurement of the g-factors of 2
states in stable A112,114,116 Sn isotopes using
the transient field technique" UNILAC - GSI,
Germany
low-energy Nov. 2007 Spokespersons A.
Jungclaus "Measurement of the magnetic moment of
the 2 state in neutron-rich radioactive 72Zn
using the high-velocity transient field
technique" GANIL, Caen, France
high-energy April
2008 Spokespersons A. Jungclaus and G.
Georgiev "g factors and lifetimes in
42,44,46Ar testing shell model interactions and
the N28 shell closure" NSCL - Michigan State
University, USA high-energy
Oct. 2008 Spokesperson A. Stuchbery Magnetic
moment and lifetime measurements on the 2 states
in 120,122,124Sn using Projectile Coulomb
excitation in inverse kinematics" UNILAC - GSI,
Germany
low-energy March 2009 Spokespersons A.
Jungclaus
Madrid Darmstadt Bonn München
Madrid Darmstadt Bonn München
Madrid CSNSM Orsay Canberra Darmstadt
Canberra NSCL/MSU Madrid
Madrid Darmstadt Bonn München
12
IS415 _at_ REX-ISOLDE low velocity TF with
radioactive beams
138Xe beam _at_ 2.78 MeV/u 5 Hz, 300 ?s pulse width
rect. Si detectors 22º ? ? ? 42º
Much more difficult !

• weaker beam, too low energy
• no recoil detection for ? ? 22º
• less alignment
• huge g-ray background (b-decay)

4 MINIBALL Ge Clusters
13
anderes Photo suchen !
4 MINIBALL Cluster detectors
14
Experimental results
singles g spectrum

• spectrum in prompt coincidence
• with target recoils

g-factor measurements feasible under conditions
at REX-ISOLDE !
15
New REX-ISOLDE proposal IS483 g(2) in
72,74Zn Spokesperson A. Jungclaus Madrid
Darmstadt Canberra - Bonn
21 shifts approved in November 2008
PhD project (PHD1) Construction of an improved
target chamber, preparation
and realization of the
experiment and data analysis
16
A new improved target chamber for low-velocity TF
measurements at REX-ISOLDE, UNILAC_at_GSI
segmented DE-E Si telescopes
diamant detector (movable)
MINIBALL Cluster
yoke
circulating liquid nitrogen cooling
17
High velocity TF with radioactive beams First
successful experiment at MSU in 2006
Beams 40 MeV/A 38S 2x105 pps on target
40Ar primary beam
40S 2x104 pps on target
48Ca primary beam
Target 355 mg/cm2 Au 110 mg/cm2 Fe
Precession Dq/g 300 mrad
14 SeGA detectors
18
Experimental results for neutron-rich 38,40S
A.D. Davies, A.E. Stuchbery et al., Phys. Rev.
Lett. 96 (2006) 112503 A.E. Stuchbery, A.D.
Davies et al., Phys. Rev. C74 (2006) 054307
19
GANIL 2008
close collaboration in the preparation
and realization of the radioactive-beam
experiments
5.000 Euro applied for to finance
Andrews participation in our European
experiments (I am participant in his Australian
research project)
20
"Measurement of the magnetic moment of the 2
state in neutron-rich radioactive 72Zn using the
high-velocity TF technique" GANIL -
Spokespersons A. Jungclaus and G. Georgiev
104º
8 EXOGAM Clover detec- tors in a horizontal plane
55º
157º
Slits (LISE)
23º
.
?
?
25 cm
72Zn
105/sec
target
phoswich detector 2º? ? ? 5º
??0.26
from LISE
23º
157º
determination of precession ?
determination of W(?) S(?)
130º
April 2008
80º
21
From RISING via PRESPEC to HISPEC
RISING
PRESPEC
2003
2005
2007
2009
2011
2013
Fast beam campaign In-beam spectroscopy
Proposals submitted to GSI PAC in Jan. 2009
Stopped beam campaign Decay spectroscopy
Fast beam In-beam spectr.
Super-FRS comissioning at FAIR
?
HISPEC DESPEC
RISING stops in September 2009
22
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23
PRESPEC Proposal Transient field magnetic moment
measurement in 134Te produced by fragmentation of
136Xe at relativistic energies Spokespersons A.
Jungclaus and A.E. Stuchbery
FRS
LYCCA-0
AGATA Cluster
FRS AGATA Cluster LYCCA-0 transient field
technique extremely difficult experiment !
24
IEM-DEC Decay studies of exotic nuclei From
RISING via PRESPEC to DESPEC
Why decay spectroscopy ?
Study of decay properties (and masses) possible
for very weakly produced, very exotic nuclei !
Decay studies very often deliver first
infor- mation about newly identified isotopes !
25
Beta- and isomeric decays close to the
doubly-magic nuclei 100Sn and 132Sn

• ?-decay studies close to 100Sn
• fusion-evaporation reactions
• GSI on-line mass separator 2004-2007

101-105Sn
132Sn
100Sn

• Isomeric decays close to 132Sn
• projectile fragmentation and fission
• GSI Fragment Recoil Separator FRS
• RISING stopped beam campaign 2006

125-130Cd
26
From RISING via PRESPEC to HISPEC
RISING
PRESPEC
2003
2005
2007
2009
2011
2013
Fast beam campaign In-beam spectroscopy
Proposals submitted to GSI PAC in Jan. 2009
Stopped beam campaign Decay spectroscopy
Fast beam In-beam spectr.
Super-FRS comissioning at FAIR
?
HISPEC DESPEC
RISING stops in September 2009
27
Identification of 130Cd in the fragmentation of
136Xe S305, summer 2006, spokesperson A.
Jungclaus
S4 position
S2 position
from ?E measurement
Z2
130Cd
Z48
position at S4
position at S2
Z1
A/q
A/q
28
?-spectrum in delayed coincidence with implanted
130Cd ions
T1/2220(30) ns
130Cd is now the lighest N82 r-process
waiting-point nucleus for which spectroscopic
information is available !
A. Jungclaus et al., Phys. Rev. Lett. 99 (2007)
132501
29
S305 About 20 new isomers in the 132Sn region
Sn
50
128
130
129
PhD Lucia Caceres
In
131
130
128
127
126
129
125
Cd
48
130
128
127
126
125
82
Ag
125
124
123
80
78
46
Pd
Rh
76
74
72
... still a lot of work to be done !
PhD project (PHD2) data analysis of S305 plus
DESPEC RD
30
The NUSTAR Facility in FAIR (Nuclear Structure,
Astrophysics and Reactions Collaboration)
DESPEC Decay spectroscopy ?-,?-,n-detectors
31
A new imaging ?-ray spectrometer for DESPEC
24 stacks of three planar Ge strip detectors
300 kEuro available within the project
FPA2008-06419-C02-01 of the group at the IFIC
Valencia for a prototype detector (stack of 3
segmented planar Ge crystals)
Negotiations (A. Gadea) with ORTEC and CANBERRA
about a collaboration agreement Company provides
segmented crystals, customer provides cryostat
both share the risks
(electronics and scanning table approved within
project of the Salamanca group)
32
Test cryostat for one segmented planar Ge crystal
crystal holding structure
developed in collaboration with GSI and
Salamanca, supported by FPA2005-00696
33
Test cryostat for a triple stack of segmented
planar Ge crystals

• design work and mounting
• mechanical parts linking the
• dewar with the end cap
• mechanics of the end cap
• (via electro erosion)
• liquid nitrogen dewar
• multiple feedthroughs
• 24 triple preamplifiers
• 36 high-voltage filters
• cold part of the preamplifiers (FETs)

35.000 10.000 15.000 5.000 10.000 10.000 10.0
00 5.000
24 ? 72 channels
100 kEuro
only if

• IFIC Valencia comes to an agreement with either
  ORTEC or CANBERRA
• and builts the prototype
• manpower to realize this work is provided within
  the project, too

PhD project (PHD2) data analysis of S305 plus
DESPEC RD
34
IEM-CSIC sub-project (IP A. Jungclaus)
Personal 2 PhD students 2 years 1 PostDoc
2 years Execution
costs Equipment 4 desktop computers
2 laptops color laser printer books
LVTF
setup HVTF chamber
g-factor accessories DESPEC cryostat Material
fungible
Travel money Varios


160.000 Euro 80.000 Euro 6.000 Euro 3.000
Euro 2.000 Euro 1.000 Euro 135.700 Euro 5.000
Euro 20.000 Euro 100.000 Euro
240.000 Euro 272.700 Euro 5.300
Euro 47.600 Euro 10.000 Euro
35
History of the group in the last five years
04
05
06
07
08
09
10
año
RyC
Inv. Cient.
UAM
IEM-CSIC
now PostDoc at GANIL
Lucia Caceres Monllor PhD 10/08 UAM PRL 99
(2007) 132501, PRC 79 (2009) 011301(R), PLB 672
(2009) 313 in prep.
Victor Modamio Hoybjor - since 01/06 PRC 77
(2008) 024310, PRC 79 (2009) 024310 2 articles
in prep.
PhDs
DEA
Jennifer Walker - since 08/06, FPU articles in
preparation
FPA2005-00696
FPA2007-66069
new project
Approved beamtime both as spokesperson and
collaborator at GSI, REX-ISOLDE, LNL .
Oct. 09
The group urgently needs new students !
36
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38
Rare ISotope INvestigations at GSI

FRS
Identification
?E ? Z
B?, TOF ?A/q
39
Experimental studies of exotic nuclei by means of
?-ray spectroscopy
40
Physics aims of the RISING stopped beam campaign
2006
204Pt
130Cd
82Nb,86Tc
54Ni
106Zr
41
DESPEC Ge array cost estimate from the
HISPEC/DESPEC technical report
planar Ge
Clover
cost in k

cost in k

1.440
24 x 3 x 20
detector elements
3.040
8 x 380
400
8 x 50
480
24 x 20
cryostats cooling HV
100

flexible frame
250

576
1152 x 0.5
pre-amplifiers

2.304
1152 x 2
digitizers and DAQ
512
256 x 2
4.900

total
4.202

504, 397, 374 k (VAT) 48x8384 instead
of 32x8256
42
The RISING ?-ray spectrometer
15 EUROBALL Cluster detectors (15x7 Ge crystals)
43
Lifetime determination from a lineshape
analysis (Doppler shift attenuation, DSA)
Spectra of one single Ge crystal at Q 51 !
Work in progress !
114Sn
3- ? 2
2 ? 0
counts
E? (keV)
E? (keV)
Accuracy will be limited by systematical uncertain
ties, not statistics !
PhD Jennifer Walker
44
B(E2) transition strengths in even-even Sn
isotopes
B(E2 0?2) (e2b2)
U234
mass number A
shell model, 100Sn core, Hjorth-Jensen
MSU, Vaman et al.
GSI, Banu et al., Doornenbal et al.
REX-ISOLDE, Cederkall et al.
NNDC
45
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47
Summary of the scientific output
73
articles
citations
9.2
We offer PhD projects with a safe scientific
output (approved beamtimes) which can be realized
in a reasonable period of time (4 years) !
48
Talks at international conferences about the work
performed within FPA2005-00696 and FPA2007-66069
(2006-2009)
1) The incomplete fusion reaction as a tool to
study neutron-rich nuclei at high spin
Present status and future perspectives (oral)
Colloque GANIL 2006, May 2006, Giens,
France 2) Results from the 136Xe fragmentation
experiment within the RISING stopped beam
campaign Workshop on RISING physics,
November 2006, Madrid (invited) 3) Results
from the first RISING stopped beam campaign
(invited) NUSTAR Annual Meeting, March 2007,
GSI Darmstadt, Germany 4) New isomers in the
doubly magic 132Sn region (invited)
Workshop on Next Generation Isomers, April 2007,
Guildford, UK 5) Measuring g-factors of excited
states in nuclei far from stability (invited)
key speaker at the ECT Workshop
Experiment-Theory Intersections in Modern Nuclear
Structure April 2007, Trento, Italy 6)
Exciting new isomers from the first RISING
stopped-beam campaign (oral)
International Nuclear Physics Conference
INOC2007, June 2007, Tokyo, Japan
49
Talks at international conferences about the work
performed within FPA2005-00696 and FPA2007-66069
(2006-2009)
7) Isomer spectroscopy and the shell structure
around 132Sn (invited) 11th Nordic
Meeting NNMXI, August 2007, Gilleleje, Denmark
8) The 130Cd seniority isomer (invited)
European Gammapool Workshop, May 2008, Paris,
France 9) The shell model structure of nuclei
in the vicinity of 132Sn (invited)
Zakopane Conference on Nuclear Physics, September
2008, Zakopane, Poland 10) First isomer
spectroscopy of the N82 r-process waiting point
nucleus 130Cd and its consequences for
stellar nucleosynthesis (invited)
KERNZ08, International Conference on Interfacing
Structure and Reactions at the Centre of
the Atom, December 2008, Queenstown, New
Zealand 11) Magnetic moment measurements using
low- and high-energy radioactive (invited)
Seminar organizer, Arbeitstreffen Kernphysik,
March 2009, Schleching, Germany
50
"Measurement of the magnetic moment of the 2
state in neutron-rich radioactive 72Zn using the
high-velocity TF technique" GANIL -
Spokespersons A. Jungclaus and G. Georgiev
104º
8 EXOGAM Clover detec- Tors in a horizontal plane
55º
157º
Slits (LISE)
23º
.
?
?
25 cm
72Zn
105/sec
target
phoswich detector 2º? ? ? 5º
??0.26
from LISE
23º
157º
determination of precession ?
determination of W(?) S(?)
130º
April 2008
80º
51
Angular correlations and logarithmic slopes in
114Sn
2 ? 0
4 ? 2
W(?)
Huge slopes !
S(?)
52
Measured precession angles DF
2 ? 0
precession DF (mrad)
1 deg
Sn
no effect
mass number A
1 deg 17.5 mrad !
estimated DF/g 84 mrad
53
Nuclear structure physics in exotic nuclei
Principal investigator José Luis Egido de los
Rios Departamento de Física Teórica, Universidad
Autonoma de Madrid
Theoretical studies of exotic nuclei José Luis
Egido de los Rios, UAM

• UAM-SM Shell model approaches bb decays
• UAM-SCCM Symmetry conserving configuration
  mixing approaches

Experimental studies of exotic nuclei by means of
?-ray spectroscopy Andrea Jungclaus, IEM-CSIC

• IEM-MAG Magnetic moment measurements using
  low- and high-energy
• stable and radioactive
  ion beams
• IEM-DEC Decay studies of exotic nuclei and
  development of new
• instrumentation

• Continuation of projects
• FIS2004-06697 (IP Luis Egido)
• FPA2005-00696 (IP Andrea Jungclaus)

• FIS2006-1245 (IP Alfredo Poves)
• FPA2007-66069 (IP Luis Egido)

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Encuentros de Física Nuclear 2008 Santiago de
Compostela
theory
experiment