Shape evolution in the neutron-rich osmium isotopes: Prompt γ-ray spectroscopy of 196Os

被引：28

作者：

John, P. R. ^{[1
,2
]}

Modamio, V. ^{[3
]}

Valiente-Dobon, J. J. ^{[3
]}

Mengoni, D. ^{[1
,2
]}

Lunardi, S. ^{[1
,2
]}

Rodriguez, T. R. ^{[4
,5
]}

Bazzacco, D. ^{[2
]}

Gadea, A. ^{[6
]}

Wheldon, C. ^{[7
]}

Alexander, T. ^{[8
]}

de Angelis, G. ^{[3
]}

Ashwood, N. ^{[7
]}

Barr, M. ^{[7
]}

Benzoni, G. ^{[9
,10
]}

Birkenbach, B. ^{[11
]}

Bizzeti, P. G. ^{[12
,13
]}

Bizzeti-Sona, A. M. ^{[12
,13
]}

Bottoni, S. ^{[9
,10
]}

Bowry, M. ^{[8
]}

Bracco, A. ^{[9
,10
]}

Browne, F. ^{[14
]}

Bunce, M. ^{[8
]}

Camera, F. ^{[9
,10
]}

Cederwall, B. ^{[15
]}

Corradi, L. ^{[3
]}

Crespi, F. C. L. ^{[9
,10
]}

Desesquelles, P. ^{[16
,17
]}

Eberth, J. ^{[11
]}

Farnea, E. ^{[2
]}

Fioretto, E. ^{[3
]}

Goergen, A. ^{[18
,19
]}

Gottardo, A. ^{[1
,3
]}

Grebosz, J. ^{[20
]}

Grente, L. ^{[18
]}

Hess, H. ^{[11
]}

Jungclaus, A. ^{[21
]}

Kokalova, Tz. ^{[7
]}

Korichi, A. ^{[16
,17
]}

Korten, W. ^{[18
]}

Kusoglu, A. ^{[22
]}

Lenzi, S. ^{[1
,2
]}

Leoni, S. ^{[9
,10
]}

Ljungvall, J. ^{[16
,17
]}

Maron, G. ^{[3
]}

Meczynski, W. ^{[20
]}

Melon, B. ^{[12
,13
]}

Menegazzo, R. ^{[1
,2
]}

Michelagnoli, C. ^{[1
,2
]}

Mijatovic, T. ^{[23
]}

Million, B. ^{[10
]}

机构：

[1] Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy

[2] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

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

[4] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[5] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain

[6] Univ Valencia, CSIC, Inst Fis Corpuscular, E-46980 Valencia, Spain

[7] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[8] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England

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

[10] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

[11] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany

[12] Univ Florence, Dipartmento Fis, I-50019 Florence, Italy

[13] Ist Nazl Fis Nucl, Sez Firenze, I-50019 Florence, Italy

[14] Univ Brighton, Sch Comp Engn & Math, Brighton BN2 4GJ, E Sussex, England

[15] Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden

[16] CNRS, IN2P3, CSNSM, F-91405 Orsay, France

[17] Univ Paris 11, F-91405 Orsay, France

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

[19] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

[20] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland

[21] CSIC, Inst Estruct Mat, E-28006 Madrid, Spain

[22] Istanbul Univ, Fac Sci, Dept Phys, TR-34134 Istanbul, Turkey

[23] Rudjer Boskovic Inst, HR-10000 Zagreb, Croatia

[24] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England

[25] CNRS, IN2P3, IPNO, F-91406 Orsay, France

[26] Univ Paris 11, F-91406 Orsay, France

[27] Univ Turin, Dipartimento Fis Teor, I-10125 Turin, Italy

[28] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[29] Univ Salamanca, Lab Radiac Ionizantes, E-37008 Salamanca, Spain

[30] Univ Libre Bruxelles, Dept Phys, B-1050 Brussels, Belgium

[31] STFC Daresbury Lab, Warrington WA4 4AD, Cheshire, England

[32] Uppsala Univ, Dept Phys & Astron, SE-75120 Uppsala, Sweden

[33] Univ Lyon, CNRS, IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France

来源：

PHYSICAL REVIEW C | 2014年 / 90卷 / 02期

基金：

英国科学技术设施理事会;

关键词：

COEXISTENCE; TRANSITIONS; ISOMERS; OS;

D O I：

10.1103/PhysRevC.90.021301

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 shape transition in the neutron-rich Os isotopes is studied by investigating the neutron-rich Os-196 nucleus through in-beam gamma-ray spectroscopy using a two-proton transfer reaction from a Pt-198 target to a Se-82 beam. The beam-like recoils were detected and identified with the large-acceptance magnetic spectrometer PRISMA, and the coincident gamma rays were measured with the advanced gamma tracking array (AGATA) demonstrator. The de-excitation of the low-lying levels of the yrast-band of Os-196 were identified for the first time. The results are compared with state-of-the-art beyond-mean-field calculations, performed for the even-even Os188-198 isotopes. The new results suggest a smooth transition in the Os isotopes from a more axial rotational behavior towards predominately vibrational nuclei through triaxial configurations. An almost perfect gamma-unstable/triaxial rotor yrast band is predicted for Os-196 which is in agreement with the experimentally measured excited states.

引用

页数：6

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