Crystal blocking measurements of the time delay of fission induced by 32S, 48Ti, and 58Ni bombardment of W

被引：27

作者：

Andersen, J. U. ^{[1
]}

Chevallier, J.

Forster, J. S.

Karamian, S. A.

机构：

[1] Univ Aarhus, Dept Phys, DK-8000 Aarhus C, Denmark

[2] Univ Montreal, Dept Phys, Quebec City, PQ H3C 3JC, Canada

[3] Joint Inst Nucl Res, FLNR, Dubna 141980, Russia

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.99.162502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The time delay in fission induced by bombardment of W with 180 MeV S-32, 240-255 MeV Ti-48, and 315-375 MeV Ni-58 has been measured by observation of crystal blocking. There is a clear narrowing and a small increase in the minimum yield of the angular dips for fission compared with scaled dips for elastically scattered ions. This is interpreted as a fission delay of about 2 as, only weakly dependent on energy and atomic number. The delay is longer by 1 to 2 orders of magnitude than obtained from standard interpretations of measurements of prescission neutrons and giant-dipole-resonance gamma rays and from calculations of the nuclear dynamics in heavy-ion reactions.

引用

页数：4

共 25 条

[1] TIME EVOLUTION OF HEAVY-ION-INDUCED FISSION STUDIED BY CRYSTAL BLOCKING [J].

ANDERSEN, JU ;

LAEGSGAARD, E ;

NIELSEN, KO ;

GIBSON, WM ;

FORSTER, JS ;

MITCHELL, IV ;

WARD, D .

PHYSICAL REVIEW LETTERS, 1976, 36 (26) :1539-1542

[2] AXIAL CHANNELING AND BLOCKING WITH RESTRICTED EQUILIBRIUM IN-PHASE SPACE [J].

ANDERSEN, JU ;

NIELSEN, BB ;

UGUZZONI, A ;

FUSCHINI, E ;

KENNEDY, EF ;

RYABOV, VA .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 1994, 90 (1-4) :166-171

[3]

ANDERSEN JU, 1980, VIDENSK SELSK MAT FY, V40, P7

[4] DYNAMIC HINDRANCE TO COMPOUND NUCLEUS FORMATION IN HEAVY-ION REACTIONS [J].

BLOCKI, JP ;

FELDMEIER, H ;

SWIATECKI, WJ .

NUCLEAR PHYSICS A, 1986, 459 (01) :145-172

[5] The mechanism of nuclear fission [J].

Bohr, N ;

Wheeler, JA .

PHYSICAL REVIEW, 1939, 56 (05) :426-450

[6] Fusion-fission and fusion-evaporation processes in 20Ne+159Tb and 20Ne+169Tm interactions between E/A=8 and 16 MeV -: art. no. 034613 [J].

Cabrera, J ;

Keutgen, T ;

El Masri, Y ;

Dufauquez, C ;

Roberfroid, V ;

Tilquin, I ;

Van Mol, J ;

Régimbart, R ;

Charity, RJ ;

Natowitz, JB ;

Hagel, K ;

Wada, R ;

Hinde, DJ .

PHYSICAL REVIEW C, 2003, 68 (03)

[7]

DROUART A, 2005, INT S EX NUCL PET 20, P192

[8] Fission time evolution with excitation energy from a crystal blocking experiment [J].

Goldenbaum, F ;

Morjean, M ;

Galin, J ;

Liénard, E ;

Lott, B ;

Périer, Y ;

Chevallier, M ;

Dauvergne, D ;

Kirsch, R ;

Poizat, JC ;

Remillieux, J ;

Cohen, C ;

L'Hoir, A ;

Prévot, G ;

Schmaus, D ;

Dural, J ;

Toulemonde, M ;

Jacquet, D .

PHYSICAL REVIEW LETTERS, 1999, 82 (25) :5012-5015

[9] DYNAMICS OF NUCLEAR-FISSION [J].

HILSCHER, D ;

ROSSNER, H .

ANNALES DE PHYSIQUE, 1992, 17 (06) :471-552

[10] NEUTRON EMISSION AS A PROBE OF FUSION-FISSION AND QUASI-FISSION DYNAMICS [J].

HINDE, DJ ;

HILSCHER, D ;

ROSSNER, H ;

GEBAUER, B ;

LEHMANN, M ;

WILPERT, M .

PHYSICAL REVIEW C, 1992, 45 (03) :1229-1259

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