COMPETING PROTON AND NEUTRON ALIGNMENTS IN NEUTRON-DEFICIENT XE-NUCLEI

被引：51

作者：

TORMANEN, S

JUUTINEN, S

JULIN, R

CEDERWALL, B

JOHNSON, A

WYSS, R

AHONEN, P

FANT, B

MATSUZAKI, M

NYBERG, J

PIIPARINEN, M

MITARAI, S

MUKAI, J

VIRTANEN, A

机构：

[1] MANNE SIEGBAHN INST PHYS,S-10405 STOCKHOLM,SWEDEN

[2] ROYAL INST TECHNOL,DEPT PHYS 1,S-10044 STOCKHOLM 70,SWEDEN

[3] UNIV HELSINKI,DEPT PHYS,SF-00170 HELSINKI 17,FINLAND

[4] FUKUOKA UNIV EDUC,DEPT PHYS,FUKUOKA 81141,JAPAN

[5] NIELS BOHR INST,TANDEM ACCELERATOR LAB,DK-4000 ROSKILDE,DENMARK

[6] KYUSHU UNIV,DEPT PHYS,FUKUOKA 812,JAPAN

来源：

NUCLEAR PHYSICS A | 1994年 / 572卷 / 02期

关键词：

MO-92(S-32; CHI-N2P-ALPHA)(117)XE; (118)XE; (S-32,4P); E = 145 MEV; PD-106(O-18,4N); E = 75 MEV; MEASURED E-GAMMA; I-GAMMA; DCO RATIOS; GAMMA-GAMMA-COIN; (117,118,120)XE DEDUCED LEVELS; J; PI; GAMMA-BRANCHING; B (LAMBDA) RATIOS; EXPERIMENTAL ROUTHIANS; ALIGNED ANGULAR MOMENTA; ENRICHED TARGETS; ARRAY OF COMPTON-SUPPRESSED GE-DETECTORS; 4-PI ARRAY OF SI CHARGED-PARTICLE DETECTORS; NEUTRON DETECTORS; TOTAL ROUTHIAN SURFACE CALCULATIONS; GAMMA-S-BAND;

D O I：

10.1016/0375-9474(94)90183-X

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：

High-spin structures of the neutron-deficient Xe-117, Xe-118, Xe-120 isotopes have been studied by in-beam gamma-ray spectroscopic techniques. The final nuclei have been identified by means of charged-particle detectors. Collective rotational bands based on the neutron d5/2, 97/2 and h11/2 configurations have been identified in Xe-117. In the even Xe-118 and Xe-120 nuclei several new side bands were observed and the previously known bands were extended. The present level schemes include two positive-parity bands constructed to high spin in Xe-118, whereas in Xe-120 three such bands were observed. In order to explain these bands, both proton and neutron (h11/2)2 alignments, as well as the shape degree of freedom, have to be invoked. The possible occurrence of a gammaS-band is addressed and a pronounced structural change for more heavy Xe-isotopes is discussed. All negative-parity side bands are interpreted in terms of proton two-quasiparticle excitations. The experimental data are compared with total routhian surface calculations.

引用

页码：417 / 458

页数：42

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