K. Riisager, TA8 ISOLDEEURONS PCC-Meeting, Mainz (Germany), 6.-7. April 2006 Recent highlights from...

EURONS PCC-Meeting, Mainz (Germany), 6.-7. April 2006K. Riisager, TA8 ISOLDE

Recent highlights from ISOLDE

• News from the facility– Users meeting, February 6-8

• ....and some physics results– IS367 REX 9Li beam– IS413 mass measurements– IS427 moments of Mg nuclei– IS429 parity non-conservation– IS439 moments of Cu nuclei


Outcome of review (NuPAC meeting)

CERN Research Board, December 1, 2005 meeting:


HIE-ISOLDE

• Detailed plans being prepared• Upgrade in several dimensions:

– REX energy– proton beam intensity– beam quality– new ISOL beams

• Outside funding:– Wallenberg foundation, 14.5 MSEK (1.5 MEuro) for RILIS

upgrade– Leuven, 0.6 MEuro– Manchester+Birmingham, 0.16 MEuro for RFQ cooler


71-81Zn71-81Zn

Nuclides measuredin 2005

Nuclides measuredin 2005

118,120,122-124Cd118,120,122-124Cd

126Xe, 136Xe126Xe, 136Xe

127,128,131-134Sn127,128,131-134Sn

first doublycharged ions

IS413 - ISOLTRAP


IS413 – ISOLTRAP, heavy Zn

-10 -5 0 5 10

280

300

320

340

360

380

mea

n T

OF

/ µ

s

rf - 1122161.85 Hz / Hz

71 72 73 74 75 76 77 78 79 80 81

-300-250-200-150-100

-500

50100150200250300

diff

ere

nce

ma

ss e

xce

ss(I

SO

LT

RA

P-A

ME

20

03

) /

keV

mass number A

Preliminary evaluation

81Zn+ resonance

September/October 2005


IS367 – REX, 9Li on d target

9Li + 2H → 8Li + t3 MeV/u beam energytwo DSSSD telescopes

October 2005


Parity non-conservation in nuclei: 180mHf revisited

IS429 collaboration - NICOLE

B upr

H = H0 + HPNC

case of 180mHf - mixture of 8- (K = 8) and 8+ (K = 0) states (E =57 keV) - regular transition strongly suppressed by K = 8 difference

Anisotropy of 511 keV transition relative to 444 keVfor B-field alternatively up and down ↓

2

PNC2

0

A R(0 ) R(180 )

2 R(0 ) R(180 )

|H |

ef

,

fect

wiI(501)

R( )= |H |

thI(4

44)

o o

o o

October 2005


Procedure:

Doppler tuningvoltage

+/- 5kV

(strong) NMR field

(weak) Guiding field

Beam deflector

Opticaldetection

Mg beam fromISOLDE, 60keV

+

Crystal

RF coil Scintillator 0

o

+ + laser + + ++ + + +

++

+++ ++ ++ ++ ++++

Scintillator 180 o

s

N

Spin polarisation by optical pumping

-100 0-50 50 100Doppler tuning voltage (V)

-100 0-50 50 100Radiofrequency (MHz)

10 10

-as

ymm

etry

HFS scan

-NMR-as

ymm

etry

31MgHFS seen in -decay asymmetry

decay asymmetry )180()0(

)180()0(

NN

NN

Ion velocity set to highest asymmetry, NMR scan by changing rf frequency

Larmor frequency seen as drop in asymmetry

Collaps: laser and β-NMR spectroscopy


IS427 – heavy Mg isotopes

-0.01

0

0.01

0.02

0.03

0.04

0.05

0.06

-3.2 -3 -2.8 -2.6 -2.4 -2.2 -2 -1.8 -1.6 -1.4 -1.2 -1 -0.8

0.035

0.04

0.045

0.05

0.055

0.06

0.065

0.07

0.075

0.08

-3.2 -3 -2.8 -2.6 -2.4 -2.2 -2 -1.8 -1.6 -1.4 -1.2 -1 -0.8

Sigma+

Sigma-

I=5/2

-0.2

-0.15

-0.1

-0.05

0

0.05

0.1

0.15

0.2

-1600 -1100 -600 -100 400 900 1400

sigma+

sigma-

I=3/2, 7/2Almost the same picture

September 2005

Measured 33Mg.HFS found, not yet NMR-peak.Run in 2006 to determinespin and magnetic moment.


2A1/2

2S1/2

2P3/2 A3/2,B3/2

QBA

SJ

J

a

March 2006 Stable beam test

A1/2=5865(2), B3/2=-28(2)

Literature (RF measurements and level mixing)A1/2=5866.915(5), B3/2=-28.8(6)

A detection efficiency 1:30 000 for the strongest component of the hyperfine structure.

Given the yields at ISOLDEthis will allow COLLAPS to study copper isotopes up to and including 72Cu.

IS439 - copper isotopesStable beam test, March 2006

K. Riisager, TA8 ISOLDEEURONS PCC-Meeting, Mainz (Germany), 6.-7. April 2006 Recent highlights from...

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