The 8+ isomer in 78Zn and the doubly magic character of 78Ni

被引：79

作者：

Daugas, JM

Grzywacz, R

Lewitowicz, M

Achouri, L

Angélique, JC

Baiborodin, D

Bennaceur, K

Bentida, R

Béraud, R

Borcea, C

Bingham, C

Catford, WN

Emsallem, A

de France, G

Grawe, H

Jones, KL

Lemmon, RC

Jimenez, MJL

Nowacki, F

Santos, FD

Pfützner, M

Regan, PH

Rykaczewski, K

Sauvestre, JE

Sawicka, M

Sletten, G

Stanoiu, M

机构：

[1] GANIL, F-14076 Caen 5, France

[2] Univ Tennessee, Knoxville, TN 37996 USA

[3] Univ Warsaw, IFD, PL-00681 Warsaw, Poland

[4] LPC, F-14021 Caen, France

[5] Acad Sci Czech Republic, Inst Nucl Phys, CZ-25068 Rez, Czech Republic

[6] Inst Phys Nucl, F-69622 Villeurbanne, France

[7] IAP, Bucharest, Romania

[8] Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England

[9] GSI Darmstadt, D-64220 Darmstadt, Germany

[10] Univ Strasbourg, LPT, F-67084 Strasbourg, France

[11] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37830 USA

[12] CEA Bruyeres Le Chatel, F-91680 Bruyeres Le Chatel, France

[13] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark

来源：

PHYSICS LETTERS B | 2000年 / 476卷 / 3-4期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1016/S0370-2693(00)00177-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A new isomeric state in Zn-78 has been identified and studied in the fragmentation of a 60.5 AMeV Kr-86 beam on a Ni-nat target. The measured energies of the transitions and the half-life, T-1/2 = 319(9) ns, of the isomeric decay suggest a spin and parity assignment I-pi = 8(+). The deduced B(E2,8(+) --> 6(+)) value equals 1.21(5) W.u. is well reproduced in large scale shell model calculations using realistic interactions in the proton-neutron 2p(3/2), 1f(5/2) 2p(1/2), 1g(9/2) model space. Standard E2 polarisation charges of 0.5e for both protons and neutrons were used. This result consists the first experimental evidence of the persistance of the N = 50 shell gap in the 78 vicinity of Ni-78(28)50. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：213 / 218

页数：6

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