共查询到20条相似文献,搜索用时 15 毫秒
1.
L. Carlén S. Jónsson J. Krumlinde J. Lyttkens N. Roy H. Ryde S. Strömberg W. Waluś G.B. Hagemann B. Herskind 《Nuclear Physics A》1982,381(1):155-172
Energy levels in 153Er have been populated in the reaction 144Sm(12C. 3n)153Er. Isotopically enriched targets were bombarded with 53–65 MeV 12C ions and the emitted γ-ray and conversion electron spectra were investigated. From studies of excitation functions. γ- coincidences, γ-ray multiplicities, delayed γ-radiation and angular distributions, the level scheme of 153Er has been constructed. The properties of the energy levels are discussed and compared with the results of calculations with a deformed shell model. The remarkable similarities and some important discrepancies of the level structure, when compared with adjacent, N = 85 nuclides, are emphasized. 相似文献
2.
3.
G. S. Li Z. Y. Dai S. X. Wen S. G. Li P. K. Weng L. K. Zhang G. J. Yuan C. X. Yang 《Zeitschrift für Physik A Hadrons and Nuclei》1996,356(1):119-123
Lifetime measurements of the high spin states in the yrast band of128Ce were performed using the Doppler shift attenuation method in connection with the reaction100Ru(32S, 2p2n)128Ce at incident energy of 141 MeV. In the vicinity of the band crossing, the previously reported anomalously highB(E2) value was not observed. The gross behavior of the normalized transition strength is approximate to symmetric rotor. It is confirmed that the trend of increase in collectivity with decreasing neutron number, which was indicated in the previous studies on130,132,134Ce, continues in128Ce. The value of quadrupole deformation parameterβ 2 deduced from the measured lifetimes is in good agreement with the theoretical calculation using a cranking model based on a non-axially deformed Woods-Saxon potential. 相似文献
4.
G. S. Li Z. Y. Dai S. X. Wen S. G. Li P. K. Weng L. K. Zhang G. J. Yuan C. X. Yang 《Zeitschrift für Physik A Hadrons and Nuclei》1986,356(2):119-123
Lifetime measurements of the high spin states in the yrast band of 128Ce were performed using the Doppler shift attenuation method in connection with the reaction 100Ru(32S, 2p2n) 128Ce at incident energy of 141 MeV. In the vicinity of the band crossing, the previously reported anomalously high B(E2) value was not observed. The gross behavior of the normalized transition strength is approximate to symmetric rotor. It is confirmed that the trend of increase in collectivity with decreasing neutron number, which was indicated in the previous studies on 130, 132, 134Ce, continues in 128Ce. The value of quadrupole deformation parameter β2 deduced from the measured lifetimes is in good agreement with the theoretical calculation using a cranking model based on a non-axially deformed Woods-Saxon potential. 相似文献
5.
C. Y. He X. Q. Li L. H. Zhu X. G. Wu Y. Liu B. Pan L. H. Li Z. M. Wang G. S. Li Z. Y. Li S. Y. Wang Q. Xu J. G. Wang H. B. Ding J. Zhai 《The European Physical Journal A - Hadrons and Nuclei》2010,43(1):1-4
Up to now, no experimental cross-section data exist for the 67Zn (n,a \alpha) 64Ni reaction in the MeV neutron energy region. In the present work, the cross-section of the 67Zn (n,a \alpha) 64Ni reaction was measured at E
n = 6.0 MeV. Experiments were performed at the Van de Graaff accelerator of Peking University, China. Fast neutrons were produced
through the D (d, n) 3He reaction using a deuterium gas target. Absolute neutron flux was determined by a small 238U fission chamber and a BF3 long counter was used as a neutron flux monitor. A twin gridded ionization chamber was employed as the a \alpha -particle detector and two back-to-back 67Zn samples were used for a \alpha events measurement. Background was measured and subtracted from foreground. The measured cross-section of the 67Zn (n,a \alpha) 64Ni reaction was 7.3 (1±15%) mb at 6.0MeV. The present result was compared with existing evaluations and TALYS code calculations. 相似文献
6.
S. André C. Foin V. Barci D. Barnéoud J. Genevey A. Gizon 《Zeitschrift für Physik A Hadrons and Nuclei》1990,337(3):349-350
An highspin yrast isomer (T1/2 ? 420ns, E>10.286 MeV, 67/2≤ I≤ 71/2) is observed in the151Er nucleus excited in the116 Sn+40 Ca reaction, using the recoil shadow method. 相似文献
7.
H.J.M. Aarts G.A.P. Engelbertink H.H. Eggenhuisen L.P. Ekström 《Nuclear Physics A》1979,321(2):515-532
High-spin states of 38Ar have been studied with the 35Cl(α, pγ)38Ar reaction at Eα = 18 MeV and with the 24Mg(16O, 2pγ)38Ar reaction at . The 38Ar level scheme is obtained with the former reaction from a proton-γ coincidence measurement. Gamma-gamma coincidence, γ-ray angular distribution and linear polarization experiments have been performed with a Ge(Li)-Na(Tl) Compton suppression spectrometer and a three-crystal Ge(Li) Compton polarimeter. Unambiguous spin-parity assignments of to the 38Ar levels at Ex = 7.51, 8.08, 8.57, 8.97, 10.17 and 11.61 MeV, respectively, are obtained. The 8.57 MeV, 8+ level has a mean life below 0.8 ps. Excitation energies, branching ratios, multipole mixing ratios and transition strengths are reported. The experimental results are compared with shell-model calculations. 相似文献
8.
N. Blasi G. Lo Bianco Ch. Protochristov D. Bazzacco G. Falconi N. H. Medina G. De Angelis D. R. Napoli 《Zeitschrift für Physik A Hadrons and Nuclei》1996,356(1):233-234
The10Be(12C,14O)8He-reaction has been used to study the levels of8He. In addition to the known excited state of8He at E x =3.6MeV, withJ π=2+, three additional states were found at excitation energies of 4.54(25)MeV, 6.03(10)MeV and 7.16(4)MeV. 相似文献
9.
E. Ideguchi Y. Gono S. Mitarai T. Morikawa A. Odahara M. Kidera M. Sibata H. Tsuchida K. Miyazaki M. Oshima Y. Hatsukawa S. Hamada H. Iimura M. Shibata T. Ishii T. Murakami H. Kusakari M. Sugawara T. Kishida K. Morita H. Kumagai M. Ishihara 《Zeitschrift für Physik A Hadrons and Nuclei》1995,351(4):363-364
High spin states of117Xe have been investigated by means of in-beam γ-ray spectroscopy using the reaction92Mo(28Si, 2pn) at beam energies of 100 to 120 MeV. The previously known νh11/2 bands are confirmed and the νg7/2 favored-signature band is extended up to 47/2+, in which two band crossings are observed at ?ω=0.33 and 0.44 MeV, respectively. Two new positive-parity bands have been established, one of which is most likely the νg7/2 unfavored-signature band. A new transition cascade with irregular level spacings is also observed. 相似文献
10.
N. Blasi G. Falconi G. Lo Bianco Ch. Protochristov D. Bazzacco G. De Angelis D. R. Napoli 《Zeitschrift für Physik A Hadrons and Nuclei》1995,351(4):359-360
The baryon density calculated at the collision center in relativistic heavy ion collisions is not representative for the density really probed by baryons in the high density collision phase. A decomposition into nucleon- and-resonance densities yields average values of 1.25N/o and 0.25/
0 at the time of maximum compression.work supported by GSI and BMFT 相似文献
11.
M. Neffgen E. M. Beck H. Hübel J. C. Bacelar M. A. Deleplanque R. M. Diamond F. S. Stephens J. E. Draper 《Zeitschrift für Physik A Hadrons and Nuclei》1992,344(3):235-241
High-spin states in165Hf, populated in the130Te(40Ca, 5n) reaction, were investigated using the Berkeley HERA -ray spectrometer array. The previously known level scheme of165Hf is appreciably extended. Intrinsic configurations, band crossing frequencies and aligned angular momenta are interpreted within the frame-work of the cranked shell model. It is suggested that the alignments of the second neutron pair and of the first proton pair in165Hf occur at 0.44 MeV and 0.48 MeV, respectively. The systematic trend of these alignment frequencies for the Hf isotopes and for theN=93 isotones is discussed.One of us (EMB) acknowledges a fellowship from the Hanns-Seidel Foundation. This work was supported by the Director, Office of Energy Research, Division of Nuclear Physics of the Office of High Energy and Nuclear Physics of the U.S. Department of Energy (Contract DE-AC03-76SF00098) and by the Bundesminister für Forschung und Technologie BRD (Contract 06 BN 181). 相似文献
12.
J. Wrzesiński K.H. Maier R. Broda B. Fornal W. Królas T. Pawłat D. Bazzacco S. Lunardi C. Rossi Alvarez G. de Angelis A. Gadea J. Gerl M. Rejmund 《The European Physical Journal A - Hadrons and Nuclei》2001,10(3):259-265
High-spin states in 208Pb have been studied by γ-ray-spectroscopy methods in deep inelastic reactions induced by beams of 208Pb, 136Xe and 76Ge beams on a thick 208Pb target. The 11+
2 state and new γ-transitions between the one-particle one-hole states of highest spin have been found and electromagnetic
matrix elements verified. High-spin states of two-particle two-hole structure have been detected for the first time. The results
are compared to shell model calculations with realistic interactions in the complete Kuo-Herling space.
Received: 31 October 2000 / Accepted: 26 March 2001 相似文献
13.
D. Hippe H. W. Schuh U. Kaup K. O. Zell P. von Brentano D. B. Fossan 《Zeitschrift für Physik A Hadrons and Nuclei》1983,311(4):329-337
The level scheme of97Tc was studied by gamma ray spectroscopy using the94Zr(6Li, 3nγ)97Tc reaction. New levels and spins and parities were established.97Tc is compared with the neighbouring even-even nucleus and with the results of an IBFM calculation. 相似文献
14.
F. Glatz G. Pappert A. Brachat P. Betz H. Röpke 《Zeitschrift für Physik A Hadrons and Nuclei》1976,278(4):319-325
Theγ-decay of 9338Ar levels between 6.84 and 10 MeV excitation energy has been measured using the35Cl(α,pγ) reaction atE α=14 MeV. A previous measurement of the same reaction could be exploited in the light of the present results, yielding spin(-parity) assignmentsJ π(7,070)=5-, J(7,507)=7,5,J π(8,077)=7+, J(8,129)=5,6 and J(8,488)=7,5. Theγ-decay modes of yrast levels, which have been previously observed in heavy ion induced reactions, are revised leading to major changes in their spin-parity assignments. New candidates for theJ π=8- and 9+ levels were found in the levels at 9,644 and 9,928 keV excitation energy, respectively. A comparison of yrast levels with shell-model calculations is satisfying. 相似文献
15.
Y. Hatsukawa T. Hayakawa K. Furutaka H. Nakada M. Kidera T. Ishii M. Matsuda M. Oshima S. Mitarai M. Sugawara H. Kusakari T. Komatsubara K. Furuno 《Zeitschrift für Physik A Hadrons and Nuclei》1997,357(1):3-4
The study of high spin states in 100Pd has indicated the presence of both single particle and collective states. More than twenty new transitions have been observed. A substantial modification and extension of the existing level scheme is proposed. The negative parity states can be understood in terms of collective excitations of the core coupled to the 9? and 5? bandheads, which are probably based upon two quasineutron ν(h11/2,g7/2) and two quasiproton π(g9/2,p1/2) configurations respectively. 相似文献
16.
C. Morand B. Berthet M. Agard J. F. Bruandet A. Giorni F. Glasser J. P. Longequeue Tsan Ung Chan 《Zeitschrift für Physik A Hadrons and Nuclei》1976,278(2):189-199
The68Ga nucleus has been studied via the reactions65Cu(α, nγ)68Ga atE α=12–21 MeV and66Zn(α, p nγ)68Ga atE α=25–40 MeV. The level scheme has been established by means of relative yield functions, electronic timing measurements, prompt and delayedγ-γ coincidences, angular distributions and directional orientation coÏncidences. Spins up to 11+ were assigned to levels up to 4 MeV excitation and the higher ones were interpreted by coupling a67Ga core with a (v 1 g9/2) neutron. 相似文献
17.
T. Ishii A. Makishima K. Koganemaru Y. Saito M. Ogawa M. Ishii 《Zeitschrift für Physik A Hadrons and Nuclei》1993,347(1):41-47
High-spin states in107Sn were studied using the reaction54Fe(56Fe, 2pn)107Sn. An odd-parity band was identified as based on thevh 11/2 orbit by measuring theγ-ray linear polarization. Also were confirmed the excited states based on thevd 5/2 andvg 7/2 orbits. The halflives of the 17/2+ and 11/2? states were measured to be 0.25(4) ns and 28(11) ps, respectively. The experimental level structure and its interpretation were in good agreement with a shell model calculation. 相似文献
18.
F. Glatz P. Betz E. Bitterwolf A. Burkard F. Heidinger Th. Kern R. Lehmann S. Norbert H. Röpke 《Zeitschrift für Physik A Hadrons and Nuclei》1979,293(1):57-73
The45Sc(α, p γ) reaction has been investigated atE α=11, 12 and 13MeV. Theγ-decay of 198 levels in48Ti up to 8,323 keV excitation energy has been observed. High-spin states were investigated by proton-γ ray angular correlation measurements atE=11 and 13MeV and by DSAM lifetime measurements atE=11 MeV. From the combined evidence spin (-parity) assignments were obtained for the levels atE x =8,323 keV (J= 10,8,6), 8,091(12, 10, 8, 6), 7,668(10, 8), 7,427(9, 7), 7,374(11, 9, 7), 6,906(10, 8, 6), 6,172(8+,6+), 6,102(10+,8+), 6,039(6), 6,034(9+, 7+), 5,630(7), 5,197(8+), 5,169(7+), 5,155(5), 4,404(5), 4,398(6+) and 4,046keV (5). Most of the ambiguous spin assignments become unique if the 8,091 keV level hasJ=12, an assumption which is favoured by its excitation function. The level spectrum thus obtained is well reproduced by shell model calculations in the pure (f 7/2)8 configuration space. Discrepancies exist in the reproduction ofγ-decay modes. The reason is found in low-lying high-spin intruder states which include the 7,427 and 8,323 keV levels. The spectrum of negative-parity states is understood qualitatively by a comparison with46Ti and42Ca. 相似文献
19.
S. Juutinen R. Julin P. Ahonen C. Fahlander J. Hattula J. Kumpulainen A. Lampinen T. Lönnroth D. Müller J. Nyberg A. Pakkanen M. Piiparinen I. Thorslund S. Törmänen A. Virtanen 《Zeitschrift für Physik A Hadrons and Nuclei》1990,335(4):475-476
A comparison of the experimental and theoretical K/L conversion-intensity ratios of E0 transitions in the lead region is presented. No major differences were found, the overall agreement being better than 7%. However, with the present data, a systematic 5% deficiency of the measured values, as compared with the calculated ones, can not be ruled out. 相似文献
20.
ZHENG Yun ZHU Li-Hua WU Xiao-Guang LI Guang-Sheng HAO Xin WANG Lie-Lin HE Chuang-Ye LIU Ying LI Xue-Qin PAN Bo WANG Lei LI Zhong-Yu DING Huai-Bo 《中国物理C(英文版)》2009,33(Z1)
The high-spin states in 128I have been studied by using in-beam γ-ray spectroscopy with the 124Sn(7Li,3n)128I reaction at beam energies of 25, 28 and 42 MeV. A new level scheme including 20 new levels and 27 new γ-transitions for 128I has been established preliminarily. 相似文献