New isomer in 96Y marking the onset of deformation at N=57

被引：20

作者：

Iskra, L. W. ^{[1
]}

Fornal, B. ^{[1
]}

Leoni, S. ^{[2
,3
]}

Bocchi, G. ^{[2
,3
]}

Petrovici, A. ^{[4
]}

Porzio, C. ^{[2
]}

Blanc, A. ^{[5
]}

De France, G. ^{[6
]}

Jentschel, M. ^{[5
]}

Koster, U. ^{[5
]}

Mutti, P. ^{[5
]}

Regis, J. -M. ^{[7
]}

Simpson, G. ^{[8
]}

Soldner, T. ^{[5
]}

Ur, C. A. ^{[9
,10
]}

Urban, W. ^{[11
]}

Bazzacco, D. ^{[9
]}

Benzoni, G. ^{[3
]}

Bottoni, S. ^{[2
,3
]}

Bruce, A. ^{[12
]}

Cieplicka-Orynczak, N. ^{[13
]}

Crespi, F. C. L. ^{[2
,3
]}

Fraile, L. M. ^{[13
]}

Korten, W. ^{[14
]}

Kroll, T. ^{[15
]}

Lalkovski, S. ^{[12
,16
]}

Marginean, N. ^{[4
]}

Michelagnoli, C. ^{[6
]}

Melon, B. ^{[17
]}

Mengoni, D. ^{[9
,18
]}

Million, B. ^{[3
]}

Nannini, A. ^{[17
]}

Napoli, D. ^{[19
]}

Podolyak, Zs. ^{[12
]}

Regan, P. H. ^{[12
,20
]}

Szpak, B. ^{[1
]}

机构：

[1] PAN, Inst Nucl Phys, PL-31342 Krakow, Poland

[2] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[3] Ist Nazl Fis Nucl, Sez Milano, Via Celoria 16, I-20133 Milan, Italy

[4] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest 077125, Romania

[5] ILL Grenoble, 71 Ave Martyrs, F-38042 Grenoble 9, France

[6] GANIL, BP 55027, F-14076 Caen 5, France

[7] Univ Cologne, IKP, Zulpicher Str 77, D-50937 Cologne, Germany

[8] LPSC, 53 Ave Martyrs, F-38026 Grenoble, France

[9] Ist Nazl Fis Nucl, Sez Padova, Padua, Italy

[10] ELI NP, Magurele, Romania

[11] Univ Warsaw, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland

[12] Univ Brighton, SCEM, Lewes Rd, Brighton BN2 4GJ, E Sussex, England

[13] Univ Complutense, CEI Moncloa, Grp Fsica Nucl, E-28040 Madrid, Spain

[14] CEA, Ctr Saclay, IRFU, F-91191 Gif Sur Yvette, France

[15] Tech Univ Darmstadt, Inst Kernphys, Schlossgartenstr 9, D-64289 Darmstadt, Germany

[16] Univ Sofia, Fac Phys, 5 James Bourchier Blvd, Sofia 1164, Bulgaria

[17] Ist Nazl Fis Nucl, Sez Firenze, Florence, Italy

[18] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy

[19] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Padua, Italy

[20] Natl Phys Lab, Acoust & Ionizing Radiat Div, Teddington TW11 0LW, Middx, England

来源：

EPL | 2017年 / 117卷 / 01期

基金：

英国科学技术设施理事会;

关键词：

FISSION FRAGMENTS; EXCITED-STATES; NUCLEI; SPECTROMETER; ARRAY; SPIN;

D O I：

10.1209/0295-5075/117/12001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The level scheme of Y-96 was significantly extended and a new 201 ns isomer was located at 1655 keV excitation energy, with spin-parity assignment of 5(+/-) or 6(-). The isomer decays to spherical low-spin structure by transitions with large hindrance and is fed by a short cascade which resembles the beginning of a rotational band. This is in analogy with the feeding and decay pattern of the 4(-) isomer in Y-98, here confirmed, by lifetime analysis, as a bandhead of a rotational structure with sizable deformation. It is suggested that the new isomer in Y-96 arises from a shape change between deformed and spherical configurations, which indicates the appearance of deformation already at N = 57 in the yttrium chain. The experimental findings for Y-96 are strengthened by theoretical calculations based on the complex Excited Vampir model.

引用

页数：6

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