High-Spin State Studies with

Deep-Inelastic Heavy Ion Reactions

Rafał Broda

Niewodniczanski Institute of Nuclear Physics PANKraków, Poland

GaspGasp

Thick Target Eksperiments Thick Target Eksperiments

R. Broda et al., JPG 32, 151 (2006)

All reaction products stopped in the target Discrete gamma lines observed except for those arising from short-lived states

High statistics-coincidences are collected including high folds and time parameters correlated with beam pulsing

Selectivity based solely on complex gamma-coincidence analysis

Identification of yrast state structures - in previously inaccessible nuclei, predominantly in the neutron-rich region

GAMMASPHERE

B.Fornal, W.Królas, T.Pawłat, J.Wrzesiński, R.B.

Purdue University, W.Lafayette, IN, USAArgonne National Laboratory, Argonne, Ill, USAHahn-Meitner Institut, Berlin, GermanyINFN LNL Legnaro/Padova University, WłochyGesellschaft fuer Schwere Ionen, Darmstadt, GermanyJYFL-University of Jyvaskyla, FinlandLBL Berkeley, Cf, USA

92Mo + 60Ni

56Fe

96Ru

(Argonne-Notre Dame Array)

48Ca (330 MeV) + 238U (thick target)GAMMASPHERE at Argonne

48Ca

66Ni

0.80

0.90

1.00

1.10

1.20

0 10 20 30 40 50 60 70 80 90

rela

tive

inte

nsity

angle [deg]

66Ni 1760 keV 1425 keV

a2 = 0.09(2), a4 = 0.03(2)

0.80

0.90

1.00

1.10

1.20

0 10 20 30 40 50 60 70 80 90

rela

tive

inte

nsity

angle [deg]

66Ni 1760 keV 356 keV

a2 = -0.09(1), a4 = 0.02(1)

f7/2 p3/2 p1/2 f5/2

PRISMA spectrometerPRISMA spectrometer A magnetic heavy ion

spectrometer designed to fully identify (A, Z) fragments deflected at large angles

CLARA: an array of 24 Clover detectors

238U + 330 MeV 48Ca

Complementary sets of data: PRISMA – (A,Z) identification, fast transitionsand GAMMASPHERE – -coincidence data

_

p1/2

f5/2

0

2

4

(4 )

(5 )

(7 )

(5 )+

-

(5 )-

-

-

+

-

+

+

1 0 2 7

2 9 7 13 4 8 8

0

1 0 2 6 .8

3 9 9 7 .4

4 8 3 0 .8

4 5 1 5 .3

5 1 4 7 .65 5 1 7 .3

6 8 7 0 .1

1 76 01 35 3

1 0 88

8 33

5 18

4 07 4 325 11 0 .15 0 8 5 .0(4 )-

6 32

1 00 2

5 95

111 3

1 51 9

Ca5020 30

2+

N/Z=1.54

N/Z=1.29

232Th + 136Xe Berkeley experimentwith ~ 80 Gammasphere detectorsJ.F.C.Cocks et al. Phys.Rev.Lett.78,2920 (1997)J.F.C.Cocks et al. Nucl.Phys.A645, 61 (1999)

208208Pb early high spin states studyPb early high spin states study

(e,e’) - J.P. Connelly at al., Phys. Rev. C 45, 2711 (1992)

Deep Inelastic Reactions64Ni + 208Pb - M. Schramm at al., Z. Phys. A 344, 363, (1993)

208Pb (1360 MeV) + 238UGammasphere at Argonne

N/Z=1.54

N/Z=1.59

206Hg

4-

8+

14-

9+

15-

16-

20+

19+

19+

81 123

2-

7+

9+

8+

4-

14-

15-

12-

18+

16-

19+19+

20+

22-

SM Eexp –Ecalc [keV]

-49+99

+158

+114+114

+182

+207

+40

+17

+70+58

+58+31

+36

π s1/2 ν f5/2-1

π h11/2-1 ν i13/2

-1

π s1/2 ν i13/2-1

π h11/2-1 ν p1/2

-1i13/2-2

π h11/2-1 ν i13/2

-3

Gamma transitions preceding in time highest isomers

I ~ 30

25+

25+

E3 !

[π h11/2- 1 ν i 13/2

-3] 22-

208Pb E3 2615 keV

π h11/2- 1 -150

ν i 13/2-3 -260

_____ 2205 keV

E3 - 2207 keV

1/2

3/2

7/2

9/2

11/2

15/2

17/219/2

25/2

29/2

35/2

39/2

204

720

506

54

570

340

157

739

328

1217

2256

942

375

807

2496

235(10) ns

2.6 s

0

204

924

14301484

2054

23942551

3291

3619

4836

7092

7332

78998034

8409

2 0 5 T l8 1 1 2 3

11/2 13/2 1/2[ h i p ] 1_1_1_

11/2 13/2[ h i ] 2_

1_

11/2 13/2 5/2[ h i f ] 1_1_1_

E3 !

[π h11/2- 1 ν i 13/2

-2] 35/2-

208Pb E3 2615 keV

π h11/2- 1 -150

ν i 13/2-2 -212

_____ 2253 keV

E3 - 2256 keV

124

Conclusions:

1. High spin states are abundantly populated in DIHI reactions

2. In light nuclei short lifetimes of excited states limit the study of high-spin states in thick target experiments

3. In heavy nuclei spin range of I=30 can be reached with the present gamma arrays detection sensitivity

4. Challenge - experiment is here more advanced than theory

5. Spectroscopic study of high-spin states in hard-to-reach nuclei is continued

beam: 48Ca @ 310 MeV provided by

TANDEM ALPI (1.5 pnA current)

accelerator complex;

target : 1 mg/cm2 stretched 208Pb (1

mg/cm2 Ta backing) ;

degrader : 4 mg/cm2 natMg;

PRISMA(49◦ grazing

angle)+CLARA;

Distances: 30 μm, 100 μm, 300 μm,

1240 μm, 2200 μm;

8-days beam-time.

J.J.Valiente-Dobon, D.Mengoni et al.

KrakKraków group and collaboratorsów group and collaborators

R. Broda, B. Fornal, W. Królas, T. Pawłat, J. Wrzesiński IFJ PAN Kraków

S. Lunardi, A. Gadea, N. Marginean, L. Corradi, A.M. Stefanini, F. Scarlassara, G. Montagnoli, M. Trotta, D. Napoli, E. Farnea Laboratori Nazionali di Legnaro and INFN Padova

R.V.F. Janssens, M.P. Carpenter, T. Lauritsen, D. Seweryniak, S. Zhu Argonne National Laboratory