共查询到20条相似文献,搜索用时 15 毫秒
1.
D. Vermeulen H. -G. Clerc W. Lang K. -H. Schmidt G. Münzenberg 《Zeitschrift für Physik A Hadrons and Nuclei》1980,294(2):149-151
The new isotope212Th has been found to decay withE α = (7.802 ±0.010) MeV andt 1/2 =(30 ?10 +20 ms. The decay energies of the previously observed isotopes213Th and214Th could be confirmed. The measured half-lives are in agreement with calculated values. 相似文献
2.
R. J. Gehrke R. C. Greenwood J. D. Baker D. H. Meikrantz 《Zeitschrift für Physik A Hadrons and Nuclei》1982,306(4):363-365
A previously unreported nuclide,168Dy, has been identified and found to have a half-life of 8.5+-0.5 min. The activity was produced in the spontaneous fission of252Cf and transported via a He jet system to a rapid radiochemical separative facility where the Dy fraction was removed from the mixed fission products. The assignment of this activity to168Dy decay was based on the presence of five γ rays in the chemically separated Dy fraction which were associated with the decay of an 8.5-min activity and on the observation of the grow-in and subsequent decay of the daughter, 2.98-min168Ho, with approximately an 8-min half-life. The γ-ray emission probabilities have been determined. 相似文献
3.
The heaviest isotope of praseodymium,154Pr, has been identified for the first time by γ-ray measurements of mass-separated activities obtained from a He-jet type on-line isotope separator for fission products of235U. The Nd-K X-rays and 10 γ-rays have been assigned to be generated by the β-decay of154Pr. The half-life has been determined to be 2.3(1) s, which is not far from the theoretical predictions of 1.5 s and 4.0 s. 相似文献
4.
J. Guo Z. Gan H. Liu W. Yang L. Shi W. Mu T. Guo K. Fang S. Shen S. Yuan X. Zhang Z. Qin R. Ma J. Zhong S. Wang D. Kong J. Qiao 《Zeitschrift für Physik A Hadrons and Nuclei》1974,355(2):111-112
The new transuranium neutron-deficient isotope 235Am was produced by bombarding of 238Pu with 35-MeV protons beam via the (p,4n) reaction. The reaction products were transported by a helium-jet system. A rapid radiochemical method was employed for separating the americium isotopes from the complex products. From the observed Kx-rays of Np, γ-ray of 235Pu and x-γ coincidence measurements, the new neutron-deficient isotope 235Am with a half-life 15±5min was definitely identified for the first time. 相似文献
5.
J. Guo Z. Gan H. Liu W. Yang L. Shi W. Mu T. Guo K. Fang S. Shen S. Yuan X. Zhang Z. Qin R. Ma J. Zhong S. Wang D. Kong J. Qiao 《Zeitschrift für Physik A Hadrons and Nuclei》1996,356(1):111-112
The level scheme of theN=82 nucleus145Eu has been extended toI=(55/2) andE x =11.2 MeV in an experiment with the Tessa Compton-suppressed Ge detector array using the127I(22Ne,4n) reaction. Most of the complicated and irregular level scheme of145Eu can be interpreted as proton multi-quasiparticle states in comparison to the 64 146 Gd82 core nucleus but also excitations across the neutronN=82 core have been observed. 相似文献
6.
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
7.
A. N. Andreyev D. D. Bogdanov V. I. Chepigin A. P. Kabachenko O. N. Malyshev R. N. Sagajdak G. M. Ter-Akopian A. V. Yeremin 《Zeitschrift für Physik A Hadrons and Nuclei》1992,343(1):123-124
The new neutron-deficient isotope218U was produced in the bombardment of197Au target with27Al ions and identified using the- correlation method. The -decay energy and the half-life of218U were determined to be 8625±25 keV and 1.5
–0.7
+7.3
ms, respectively. Evaporation residues recoiling from the target were separated in-flight from the projectiles and from the products of other nuclear reactions by the electrostatic separator VASSILISSA [1]. 相似文献
8.
O. N. Malyshev A. V. Belozerov M. L. Chelnokov V. I. Chepigin V. A. Gorshkov A. P. Kabachenko A. G. Popeko J. Rohach R. N. Sagaidak A. V. Yeremin S. I. Mulgin S. V. Zhdanov 《The European Physical Journal A - Hadrons and Nuclei》2000,8(3):295-297
The new neutron deficient isotope 217U was produced in the bombardment of the 182W target with 40Ar ions and identified using a recoil-- correlation method. The -decay energy and the half-life of 217U were determined to be 8005 ± 20 keV and 15.6 +21.3
-5.7 ms, respectively.
Received: 18 May 2000 / Accepted: 21 June 2000 相似文献
9.
10.
A. N. Andreyev D. D. Bogdanov V. I. Chepigin A. P. Kabachenko O. N. Malyshev R. N. Sagaidak G. M. Ter-Akopian M. Veselsky A. V. Yeremin 《Zeitschrift für Physik A Hadrons and Nuclei》1993,345(2):247-248
In continuation of our experimental program on investigation of evaporation residues (ER's) in the region close to N=126 [1, 2], the new neutron-deficient isotope219U has been produced in the irradiations of an197Au target with a beam of27A1 ions. The identification of219U was made establishing genetic position and time correlations between the implanted ER's with their subsequentα-decays. Theα-decay energy and half-life were measured to be (9680±40) keV and (42 ?13 +34 )μs, respectively. To separate the evaporation residues in-flight the kinematic separator VASSILISSA [3] was used. 相似文献
11.
T. Sekine A. Osa M. Koizumi S. Ichikawa M. Asai H. Yamamoto K. Kawade 《Zeitschrift für Physik A Hadrons and Nuclei》1994,349(2):143-146
A new isotope,127Pr, has been identified and its decay has been studied using on-line isotope separation of94Mo (36Ar,p2n) reaction products. The half-life of the isotope was determined to be 7.7(6) s, and a /X-ray spectrum has been obtained. A partial level scheme is proposed for127Ce on the basis of-singles,-gated and-coincidence data.The authors would like to thank the TIARA cyclotron crew for their cooperation in generating an intense36Ar beam as well as in operating the cyclotron. This work was partly supported by the JAERI-University Collaborative Research Project. 相似文献
12.
K. Rykaczewski R. Kirchner W. Kurcewicz D. Schardt N. Kaffrell P. Peuser E. Runte W. -D. Schmidt-Ott P. Tidemand-Petersson K. -L. Gippert 《Zeitschrift für Physik A Hadrons and Nuclei》1983,309(3):273-274
The new neutron-rich isotope183Lu was produced in multinucleon transfer reactions by irradiatingnatW/Ta targets with 11.7 MeV/u136Xe ions, and identified by mass separation and decay spectroscopy. The measured half-life of183Lu is 58±4 s. The properties of the excited states of183Hf are discussed. 相似文献
13.
Z.G. Gan Z. Qin H.M. Fan X.G. Lei Y.B. Xu J.J. He H.Y. Liu X.L. Wu J.S. Guo X.H. Zhou S.G. Yuan G.M. Jin 《The European Physical Journal A - Hadrons and Nuclei》2001,10(1):21-25
An isotope of the element 105 with mass number 259 has been produced via the reaction 241Am(22Ne, 4n)259Db at E
lab = 118 MeV. The reaction products were transported and collected using the helium-jet technique and the rotating wheel apparatus.
The α-decays of the products and their daughter nuclides were detected by a set of Si(Au) detectors arranged ingeniously.
The Z and A of the nuclide have been unambiguously identified by the genetic relationship between the new activity and the known nuclide
255Lr established by α-recoiled milking measurement. The new nuclide 259Db has a half-life of 0.51±0.16 s and decays by alpha-particle emission of E
α = 9.47 MeV. Furthermore, the nuclide 258Db and its daughter 254Lr have also been clearly observed using the same projectile-target combination. Their half-lives and α-particle energies
determined in this work are in agreement with previous known data, thus also proving the reliability of our assignment of
259Db.
Received: 7 December 2000 / Accepted: 6 February 2001 相似文献
14.
M. Asai K. Tsukada S. Ichikawa M. Sakama H. Haba Y. Nagame I. Nishinaka K. Akiyama A. Toyoshima T. Kaneko Y. Oura Y. Kojima M. Shibata 《The European Physical Journal A - Hadrons and Nuclei》2003,16(1):17-19
A new neutron-deficient berkelium isotope 241Bk produced in the 239Pu(6Li, 4n) reaction has been identified using a gas-jet coupled on-line isotope separator. Cm K and L X-rays associated with the EC decay of 241Bk were observed in the mass-241 fraction, and three γ transitions were attributed to the EC decay of 241Bk through X-γ coincidences. The half-life of 241Bk was determined to be 4.6±0.4 min which is 1/2-1/4 of that of theoretical predictions. The half-life value and the observed
γ transitions can be consistently explained as a consequence of the allowed EC transition of π7/2+[633] → ν7/2+[624].
Received: 14 October 2002 / Accepted: 6 November 2002 / Published online: 17 January 2003
RID="a"
ID="a"e-mail: asai@tandem.tokai.jaeri.go.jp
Communicated by J. ?yst? 相似文献
15.
J. Äystö D.M. Moltz M.D. Cable R.D. Von Dincklage R.F. Parry J.M. Wouters Joseph Cerny 《Physics letters. [Part B]》1979,82(1):43-46
Observation of beta-delayed protons from the decay of the mass separated Tz=?2 nuclide establishes the mass excess of the lowest T=2 (0+) state in 24Al (5903±9 KeV). An excellent fit to the quadratic form of the isobaric multiplet mass equation is obtained. 相似文献
16.
F. Meissner W. -D. Schmidt-Ott V. Freystein T. Hild E. Runte H. Salewski R. Michaelsen 《Zeitschrift für Physik A Hadrons and Nuclei》1989,332(2):153-156
Theα- and β-decay of the new isotope167W were observed in the reaction of 191 MeV36Ar with136Ba using a helium-jet and a fast tape-transport system. The identification is based on coincidences with tantalum X-rays and excitation function measurements. The measured half-life is 19.9(5) s. A decay scheme comprising 12 levels was constructed from γγ-coincidences. The β-decay is discussed within experimental and calculated level systematics. Alpha-rays with energy 4.55(2) MeV were assigned to167W. 相似文献
17.
18.
19.
Bollinger RK White BD Neumeier JJ Sandim HR Suzuki Y dos Santos CA Avci R Migliori A Betts JB 《Physical review letters》2011,107(7):075503
Thermal-expansion measurements of the Group 5 elements V, Nb, and Ta reveal a structural distortion below 300 K. Data for single-crystalline Nb and Ta display anisotropic thermal expansion, martensitic in character, that is inconsistent with cubic crystal structures at low temperature. Published results on V show similar behavior. Interstitial impurities suppress the transition. 相似文献
20.
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