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High-spin states in neutron-rich ^(102)Mo nucleus

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Chinese Physics C 2009年第S1期33卷 199-201页

作者：杨韵颐朱胜江 j. H. Hamilton A. V. Ramayya j. k. hwang j. O. Rasmussen 丁怀博王建国徐强顾龙 Department of Physics Tsinghua University Department of Physics Vanderbilt University

High-spin states in neutron-rich 102Mo nucleus have been studied by measuring the prompt γ-rays in the spontaneous fission of 252Cf. The previous level scheme has been updated and some new levels and transitions are identified. The one-phonon γ-band is expanded and a band head level of the two-phonon γ- band is proposed. The systematic characteristics of yrast bands, one-phonon γ-bands, two-phonon γ-bands and quasi-particle bands in 102Mo, 104Mo and 106Mo are discussed.

关键词： spontaneous fission neutron-rich nucleus γ-band quasi-particle band

Search for Double γ-Vibrational Bands in Neutron-Rich ^105Mo Nucleus

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Chinese Physics Letters 2006年第12期23卷 3222-3225页

作者：丁怀博朱胜江 j. H. Hamilton A. V. Ramayya j. k. hwang Y. X. Luo j. O. Rasmussen I. Y. Lee 车兴来陈永静李明亮 Department of Physics Tsinghua University Beijing 100084 Department of Phvsics Vanderbilt University Nashville Tennessee 37235 USA Lawrence Berk.ley National Laboratory Berkeley California 94720 USA

Levels in the neutron-rich ^105Mo nucleus have been investigated by observing prompt γ-rays following the spontaneous fission fragments of^252 Cf with the Gammasphere detector array. The yrast band has been confirmed and updated. The other two collective bands with the band head levels at 870.5 and 1534.6 k.V are newly observed, and they are suggested as the candidates for one-phonon k. 9/2 and two-phonon k.= 13/2 double γ-vibrational bands, respectively. Systematic characteristics of these bands have been discussed.

关键词： Double γ-Vibrational Bands Systematic characteristics

High spin states in neutron-rich ^(106)Tc nucleus

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Chinese Physics C 2009年第S1期33卷 182-184页

作者：顾龙朱胜江 j. H. Hamilton A. V. Ramayya j. k. hwang j. O. Rasmussen I. Y. Lee 徐强车兴来王建国丁怀博杨韵颐 Department of Physics Tsinghua University Department of Physics Vanderbilt University Lawrence Berk.ley National Laboratory

The high spin states of the neutron-rich odd-odd 106Tc nucleus have been reinvestigated by observing prompt γ-rays from the spontaneous fission of 252Cf. A previously k.own collective band is confirmed and expanded, and a new collective band is newly identified. Several levels in previous report in 106Tc are reexamined and they belong to the members of a band in 107Tc. The total Routhian surface (TRS) calculations show that the 106Tc has triaxial shape. The spins and parities as well as the configurations for these bands have been tentatively assigned according to the analysis of the angular momentum alignments.

关键词： spontaneous fission collective band γ-transition and level energy

Observation of a new rotational band in ^(104)Nb nucleus

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Chinese Physics C 2009年第S1期33卷 158-160页

作者：王建国朱胜江 j. H. Hamilton A. V. Ramayya j. k. hwang j. O. Rasmussen I. Y. Lee 丁怀博徐强顾龙杨韵颐 Department of Physics Tsinghua University Department of Physics Vanderbilt University Lawrence Berk.ley National Laboratory

The high spin states in neutron-rich 104Nb have been investigated from study of prompt γ-rays in spontaneous fission of 252Cf with the Gammasphere detector array. A new rotational band has been identified for the fir... 详细信息

关键词： high spin states spontaneous fission neutron-rich nucleus semi-decoupled band

Extended collective bands in neutron-rich ^(109)Ru

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Chinese Physics C 2009年第S1期33卷 154-157页

作者：丁怀博朱胜江 j. H. Hamilton A. V. Ramayya j. k. hwang j. O. Rasmussen C. T. Goodin I. Y. Lee 王建国车兴来顾龙 Department of Physics Tsinghua University Department of Physics Vanderbilt University Lawrence Berk.ley National Laboratory

Levels in the neutron-rich 109Ru have been studied by observing the prompt γ-rays following the spontaneous fission fragments of 252Cf. The ground state band and the negative parity bands have been confirmed and extended. A positive parity band with the band head level at 332.5 k.V is newly identified and suggested as a single-neutron excitation band built on the 7/2+[404] Nilsson orbital. Some structural characteristics of these bands are discussed.

关键词： collective levels γ-transitions and level energies neutron-rich nucleus spontaneous fission

High Spin Band Structure in ^112Ru

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Chinese Physics Letters 2006年第2期23卷 328-331页

作者：车兴来朱胜江 j. H. Hamilton A. V. Ramayya j. k. hwang j. O. Rasmussen Y. X. Luo 陈水静李明亮丁怀搏禹英男 I. Y. Lee W. C. Ma Department of Physics Tsinghua University Beijing 100084 Department of Physics Vanderbilt University Nashville Tibnnessee 37235 USA Lawrence Berk.ley National Laboratory Berkeley California 94720 USA Department of Physics Mississippi State University Mississippi 39762 USA

Levels in the neutron-rich ^112Ru nucleus have been investigated by observing prompt gamma-rays from the spontaneous fission of ^252Cf with the Gammasphere detector array. The ground state band and the one-phonon γ-vibrational band have been confirmed and extended with spin up to 16h and 15h, respectively. The other two side bands, one proposed as two-phonon γ-vibrational band and the other proposed as two-quasiparticle band, have been observed for the first time. The total-Routhian-surface calculations show that rotational 112 Ru nucleus has triaxial deformation with parameters β2 - 0.27 and γ= -29°. The observed band crossing in the yrast band is due to the alignment of a pair of h11/2 neutrons according to the crank.d shell model calculations. The possible configuration for the quasiparticle band has also been discussed.

关键词： Structure Respectively Neutron-Rich Nucleus

Search for chiral bands in A～110 neutron-rich nuclei

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Chinese Physics C 2009年第S1期33卷 145-147页

作者：朱胜江 j. H. Hamilton A. V. Ramayya j. k. hwang j. O. Rasmussen 王建国车兴来丁怀博 S. Frauendorf V. Dimitrov 徐强顾龙杨韵颐 Department of Physics Tsinghua University Department of Physics Vanderbilt University Lawrence Berk.ley National Laboratory Physics Department Notre Dame University

High spin states in A～110 neutron-rich 106Mo, 110Ru and 112Ru nuclei have been reinvestigated by measuring the prompt γ-rays from the spontaneous fission of 252Cf. Two similar sets of bands are observed to high spins in each of three nuclei. Through analyzing of characters of the band structures, the chiral doublet bands are suggested in 106Mo, 110Ru and 112Ru.

关键词： nuclear structure high spin states triaxiality chiral doublet bands

Collective Band Structures and Identification of One-Phonon and Two-Phonon γ-Vibrational Bands in 109Tc

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Chinese Physics Letters 2010年第6期27卷 62-65页

作者： GU Long ZHU Sheng-j.ang j. H. Hamilton A. V. Ramayya j. k. hwang S. H. Liu WANG j.an-Guo Y. X. Luo j. O. Rasmussen I. Y. Lee XU Qiang E. Y. Yeoh W. C. Ma Department of Physics Tsinghua University Beijing 100084 Department of Physics Vanderbilt University Nashville Tennessee 37235 USA Lawrence Berk.ley National Laboratory Berkeley California 94720 USA Department of Physics Mississippi State University Mississippi State MS 39762 USA

The high spin states of the neutron-rich 109Tc nucleus are reinvestigated by observing prompt γ-rays from the spontaneous fission of 252 Cf. The previously k.own yrast band based on the 7/2＋ state is updated. A side band built on the 11/2＋ state is expanded and a new band based on the 15/2＋ state is identified. Band crossing in the yrast band occurs around fω≈ 0.36 MeV. This band crossing is associated with the alignment of two h11/2 neutrons according to the crank.d shell model calculations. The band based on the 11/2＋ state is proposed as a candidate for the one-phonon γ-vibrational band, and the band built on the 15/2＋ state is proposed as a candidate for the two-phonon γ-vibrational band. Other characteristics for the observed bands are discussed.

关键词： Crossing over Vibration

High spin states in 136,137La, 108,110,102Ru and 105Mo nuclei

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High spin states in 136,137La, 108,110,102Ru and 105Mo nucle...