Competition between fusion fission and quasifission in 32 s 184 w reaction
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Competition between fusion-fission and quasifission in 32 S+ 184 W reaction. Huanqiao Zhang China Institute of Atomic Energy. Collaborators. China Institute of Atomic Energy C. L. Zhang, C. J. Lin, Z. H. Liu, F. Yang JINR, Dubna, Russia A. K. Nasirov Universit à di Messina, Italy

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Competition between fusion-fission and quasifission in 32 S+ 184 W reaction

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Competition between fusion-fission and quasifission in 32S+184W reaction

Huanqiao Zhang

China Institute of Atomic Energy


Collaborators

China Institute of Atomic Energy

C. L. Zhang, C. J. Lin, Z. H. Liu, F. Yang

JINR, Dubna, Russia

A. K. Nasirov

Università di Messina, Italy

G. Mandaglio, M. Manganaro, G. Giardina


Outline:

Ⅰ.Introduction

Ⅱ.Experiment Procedure

Ⅲ.Experiment result

Ⅳ. Compare with theory calculation

Ⅴ. Conclusion


Chart of the Nuclides at High Z End

LogT

LogT

LogT

LogT

1/2

1/2

1/2

1/2

(sec)

(sec)

(sec)

(sec)

14

14

14

14

120

120

120

120

Proton number

10

10

10

10

110

110

110

110

6

6

6

6

100

100

100

100

2

2

2

2

90

90

90

90

-

-

-

-

2

2

2

2

80

80

80

80

-

-

-

-

6

6

6

6

70

70

70

70

110

110

110

110

150

150

150

150

170

170

170

170

100

100

100

100

130

130

130

130

190

190

190

190

120

120

120

120

140

140

140

140

160

160

160

160

180

180

180

180

Neutron number

Neutron number

Neutron number

Neutron number

Ⅰ.Introduction

Proton number


QF

DNS

T

P

SF

CN

ER


Ⅱ.Experiment Procedure

HI-13 tandem accelerator at CIAE


Experimental setup

Si detectoes

Monitors

150

Si strips

Beam: 32S; Target: 184W

EnergyLab: 140,145,150,155, 160,165,170MeV.


Energy and angle calculation

V.E.Viola et,al PRC 31,1550(1985)


The detector position


32S+184W

ELab=170MeV

θLab=54.850

elastic

Ⅲ.Experiment result


32S+184W

ELab=165MeV

Angle: 690---760

DF03:64.840

Position

32S+184W

ELab=170MeV

Angle: 69.020---760

DF01:54.850

Energy


32S+184W

ELab=170MeV

Angle: 88.90---96.490

DF01:54.850

Energy

32S+184W

ELab=170MeV

Angle: 76.90---83.980

DF01:54.850

Fission production

folding angle


Gaussian fit


Ⅳ. Compare with theory calculation


Ⅴ. Conclusion

An increase of the hindrance to complete fusion at large beam energies : the dependence of the quasifission and intrinsic fusion barriers of dinuclear system on its angular momentum.

The maximal value of the total cross section of the evaporation residue is 0.12 mb and fusion-fission cross section is comparable with the quasifission cross section.

The effects of competition between fusion and quasifission in the reaction play an important role in the dynamics process.


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