Reaction mechanisms and staggering in S plus Ni collisions

被引：54

作者：

D'Agostino, M. ^{[1
,2
]}

Bruno, M. ^{[1
,2
]}

Gulminelli, F. ^{[3
]}

Morelli, L. ^{[1
,2
]}

Baiocco, G. ^{[1
,2
,3
]}

Bardelli, L. ^{[4
,5
]}

Barlini, S. ^{[4
]}

Cannata, F. ^{[1
,2
]}

Casini, G. ^{[4
]}

Geraci, E. ^{[5
,6
]}

Gramegna, F. ^{[7
]}

Kravchuk, V. L. ^{[7
]}

Marchi, T. ^{[7
,8
]}

Moroni, A. ^{[9
]}

Ordine, A. ^{[10
]}

Radutai, Ad. R. ^{[11
]}

机构：

[1] Univ Bologna, Dipartimento Fis, Bologna, Italy

[2] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[3] IN2P3 CNRS Ensicaen, F-14076 Caen, France

[4] Ist Nazl Fis Nucl, I-50125 Florence, Italy

[5] Ist Nazl Fis Nucl, I-95129 Catania, Italy

[6] Univ Catania, Dipartimento Fis, Catania, Italy

[7] Ist Nazl Fis Nucl, Lab Nazl Legnaro, Legnaro, Italy

[8] Univ Padua, Dipartimento Fis, Padua, Italy

[9] Ist Nazl Fis Nucl, I-20133 Milan, Italy

[10] Ist Nazl Fis Nucl, I-80125 Naples, Italy

[11] NIPNE, Bucharest, Romania

来源：

NUCLEAR PHYSICS A | 2011年 / 861卷 / 01期

关键词：

NUCLEAR REACTIONS Ni-58; Ni-64(S-32; X); E=463; MeV; measured fragment yield and charge distribution; deduced reaction mechanism features; odd-even effects; HEAVY-ION COLLISIONS; STATISTICAL MULTIFRAGMENTATION; DECAY; DYNAMICS; HOT;

D O I：

10.1016/j.nuclphysa.2011.06.017

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The reactions S-32 + Ni-58 and S-32 + Ni-64 are studied at 14.5 A MeV. After a selection of the collision mechanism, we show that important even odd effects are present in the isotopic fragment distributions when the excitation energy is small. Close to the multifragmentation threshold this staggering appears hidden by the rapid variation of the production yields with the fragment size. Once this effect is accounted for, the staggering appears to be a universal feature of fragment production, slightly enhanced when the emission source is neutron poor. A closer look at the behavior of the production yields as a function of the neutron excess N - Z, reveals that odd even effects cannot be explained by pairing effects in the nuclear masses alone, but depend in a more complex way on the de-excitation chain. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：47 / 66

页数：20

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