共查询到20条相似文献,搜索用时 15 毫秒
1.
E. Runte F. Meissner V. Freystein T. Hild H. Salewski W. -D. Schmidt-Ott R. Michaelsen 《Zeitschrift für Physik A Hadrons and Nuclei》1987,328(3):373-377
Irradiating LaF3-targets with36Ar, the decay of the new isotope171Re was observed for the first time and its half-life determined to be 15.2(4) s. Based on the measuredγ- and X-ray data, a decay scheme could be constructed. 相似文献
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J. Uusitalo M. Leino R. G. Allatt T. Enqvist K. Eskola P. T. Greenlees S. Hurskanen A. Keenan H. Kettunen P. Kuusiniemi R. D. Page W. H. Trzaska 《Zeitschrift für Physik A Hadrons and Nuclei》1997,358(4):375-376
Neutron deficient mercury isotopes were produced in the reaction 36Ar + 144Sm using bombarding energies of 180–230 MeV. Fusion products were separated in-flight from the primary beam using a gas-filled recoil separator. An alpha line with the alpha particle energy and half-life of (7069±11) keV and (2.1 ?0.7 +1.8 ) ms, respectively, was assigned to the new mercury isotope 174Hg. 相似文献
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P. J. Sellin P. J. Woods T. Davinson N. J. Davis A. N. James K. Livingston R. D. Page A. C. Shotter 《Zeitschrift für Physik A Hadrons and Nuclei》1993,346(4):323-324
The first observation of the extremely neutrondeficient nucleus172Au is reported, produced using the fusion evaporation reaction70Ge+106Cd→176Hg* (Ex?64 MeV). Mass separated evaporation residues were implanted into a double-sided silicon strip detector, and the energy and time of subsequent decay events were recorded. The alpha decay of172Au was measured with an energy =6860±10 KeV, corresponding to =7020±10 Kev, and a half-life of 4±1 ms. No evidence was seen for a proton decay branch, implying a limit ofb p ≤ 2 %. 相似文献
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G. D. Alkhazov E. Ye. Berlovich K. A. Mezilev Yu. N. Novikov V. N. Pantelejev A. G. Poljakov K. Ya. Gromov V. G. Kalinnikov J. Kormicki A. Potempa E. Rurarz F. Tarkanyi 《Zeitschrift für Physik A Hadrons and Nuclei》1980,295(3):305-306
Lutetium and ytterbium isotopes with masses A=159,158 have been produced by proton induced spallation reaction, and investigated by on-line mass separation and subsequent decay spectroscopy. A new isotope159Lu (T1/2=12.3±1 s) has been identified, and newγ-ray data have been obtained for the decay of158Lu and159, 158Yb. 相似文献
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U. Bosch-Wocke W. -D. Schmidt-Ott F. Meissner H. Salewski R. Michaelsen 《Zeitschrift für Physik A Hadrons and Nuclei》1992,342(2):245-246
The probability for non-radiative (n.r.) excitations in muonic209Bi was determined from a (
–,)-measurement by comparing the intensities of muonic X-ray transitions in single and coincidence spectra. The values of Pn.r(3p1s)=(17.9±2.0)% and Pn.r.(3d1s)=(3.0±2.2)% were measured for the first time. The strength of the n.r. decay of the 2p-level was found to be (4.2±2.2)%. The n.r. transition probabilities of two subcomplexes of the (2p1s)-transition leading to different mean excitation energies are (3.2±1.8)% and (5.0±2.0)%, respectively.We are indebted to the following institutes or organizations for financial support: Bundesministerium ffir Forschung und Technologic der Bundesrepubfik Deutschland contract number 06 BN 271 (HP, PD, HH, FR, CR), Foundation for Fundamental Research on Matter (FOM) and the Netherlands Organization of the Advancement of Pure Research (NWO) (JK, CTAMdL, WL, AT) and the Schweizer Nationalfonds (LS). 相似文献
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S. Hofmann F.P. Heßberger D. Ackermann S. Antalic P. Cagarda S. Ćwiok B. Kindler J. Kojouharova B. Lommel R. Mann G. Münzenberg A.G. Popeko S. Saro H.J. Schött A.V. Yeremin 《The European Physical Journal A - Hadrons and Nuclei》2001,10(1):5-10
The even-even nucleus 270110 was synthesized using the reaction 64Ni + 207Pb. A total of eight α-decay chains was measured during an irradiation time of seven days. Decay data were obtained for the
ground-state and a high-spin K isomer. The new nuclei 266Hs and 262Sg were identified as daughter products after α-decay. Spontaneous fission of 262Sg terminates the decay chain. The measured data are in agreement with calculations using the macroscopic-microscopic model
and with self-consistent HFB calculations with Skyrme-Sly4 interaction.
Received: 27 November 2000 / Accepted: 16 January 2001 相似文献
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B. Béraud J. Tréherne A. Charvet R. Duffait J. Genevey A. Gizon J. Gizon M. Meyer 《Zeitschrift für Physik A Hadrons and Nuclei》1981,299(3):279-280
102In, [T1/2=(24±4)s], has been identified for the first time using an on-line mass isotopic separator operating on nuclear reactions induced by heavy ions. Gamma-rays observed both in102In→102Cd decay and in-beam measurements allow to build a partial level scheme for102Cd. Systematics of the two first excited states of even cadmium isotopes shows the special behaviour of the lightest one. 相似文献
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T. Shizuma M. Kidera E. Ideguchi A. Odahara H. Tomura S. Suematsu T. Kuroyanagi Y. Gono S. Mitarai J. Mukai T. Komatsubara K. Furuno K. Heiguchi 《Zeitschrift für Physik A Hadrons and Nuclei》1994,348(1):25-29
Theβ + decay of86Mo has been firstly investigated by means ofβγ spectroscopy. The86Mo nuclei were produced by fusion-evaporation reactions of54 Fe (35Cl, 1 p2n) and58Ni (32S,2p 2n) at beam energies of 103 and 120 MeV, respectively. Threeγ rays of 47.3, 49.8 and 187.0 keV were unambiguously identified to follow theβ + decay of86Mo by results ofXγ andβγ coincidence and cross-bombardment. A half life and a maximumβ +-ray energy of86Mo were determined to be 19.6±1.1 s and 3.9±0.4 MeV, respectively. A decay scheme of86Mo is proposed in this article. Furthermore, a decay of86Nb has been studied using the same combinations of projectiles and targets, and a newβ-decaying isomer86m Nb was observed with a half life of 56.3±8.3 s. 相似文献
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We discuss the possibility that the decay of the neutral B mesons via a non-spectator mechanism might have a significant branching fraction into states. The lightest such hybrid mesons would be recognizable as narroe state of mass 1.6 ± 0.4 decaying predominantly into hadrons containing strange quarks. 相似文献
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D. Frekers P. Puppe J.H. Thies P.P. Povinec F. Šimkovic J. Staniček I. Sýkora 《Nuclear Physics A》2011
Experimental results on the measurement of the double-electron capture (εε) decay process of 74Se are described. This decay is particularly interesting, because 74Se is almost degenerate to the second excited state at 1204 keV in the daughter nucleus 74Ge. Such a degeneracy favors a neutrinoless decay because of the large phase-space suppression for a decay with two neutrinos. Subsequent de-excitation would generate a 2γ-ray cascade of 608 and 596 keV, whose coincident detection provides a unique signature for this particular εε process. The 2γ-ray cascade has been searched for by a HPGe γ-ray detector in coincidence with a NaI detector using 3 kg of natural selenium. 相似文献
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Fu-Sheng Yu 《中国科学:物理学 力学 天文学(英文版)》2020,(2):27-28
Double-charm baryons,whose components are two heavy charm quarks and one light quark,are part of a large family of hadrons predicted by the quark model.Studies on them are helpful to understand the hadron structure and the nature of the strong interaction.After efforts expended over decades of searching,experimental measurements achieved a breakthrough with the first observation of the double-charm baryon of■^++cc(ccu)via■^++cc→Λ^+c K^-π^+π^+ by the LHCb collaboration in 2017[1].Since then,the LHCb collaboration has been leading the experimental studies for doubly charmed baryons[2-6]because they are produced in considerably large numbers in the Large Hadron Collider(LHC). 相似文献
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A new isotope, 90218Th128, has been found to decay with Eα = 9.67 ± 0.02 MeV and . The reduced α-particle width of 218Th is about 1.4 times the value expected from the general trend of the N = 128 isotones with Z = 84?89. 相似文献
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L.B. Auerbach N. Haik V.L. Highland W.K. McFarlane R.J. Macek J.C. Pratt J. Sarracino R.D. Werbeck 《Physics letters. [Part B]》1980,90(3):317-318
A new search with increased detection efficiency has been made for the decay of the neutral pion into four photons, an allowed decay which is expected to be rare. We have observed no events, placing an upper limit on the branching ratio of 4.4 × 10?6 at 90% confidence level. 相似文献
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D. Yu. Golubkov V. Yu. Egorychev Yu. M. Zaitsev 《Moscow University Physics Bulletin》2013,68(5):367-372
Studies of rare decays of charmed mesons are used to test the Standard Model and search for new physics. In the present paper we review the progress in the experimental methods of searching for the D 0→μ+μ? rare decay in recent studies of proton-nuclear and hadron-hadron interactions. 相似文献
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H. Penttilä J. Äystö K. Eskola Z. Janas P. P. Jauho A. Jokinen M. E. Leino J. M. Parmonen P. Taskinen 《Zeitschrift für Physik A Hadrons and Nuclei》1991,338(3):291-294
In this paper we wish to report the first direct observations of the beta decays of117Pd and of a new isotope119Pd. The measuredβ-half-life is 4.3±0.3 s for117Pd. For119Pd, the existence of two beta-decaying states with the same half-life but of opposite parity cannot be excluded. The measured half-life for119Pd is 0.92±0.13 s. The observed beta half-lifes are in good agreement with the QRPA predictions. The observed level structure of117Ag and119Ag are discussed in the frame of the level systematics of the known odd Ag isotopes closer to stability. 相似文献