共查询到20条相似文献,搜索用时 31 毫秒
1.
H. Iwasaki T. Motobayashi H. Akiyoshi Y. Ando N. Fukuda H. Fujiwara Zs. Fülöp K. I. Hahn Y. Higurashi M. Hirai I. Hisanaga N. Iwasa T. Kijima A. Mengoni T. Minemura T. Nakamura M. Notani S. Ozawa H. Sagawa H. Sakurai S. Shimoura S. Takeuchi T. Teranishi Y. Yanagisawa M. Ishihara 《The European Physical Journal A - Hadrons and Nuclei》2002,13(1-2):55-58
Experimental studies on in-beam γ-ray spectroscopy using a 12Be radioactive beam are presented. Inelastic scattering of the neutron-rich 12Be nucleus on 208Pb, 12C, and (CH2)n targets has been studied by measuring de-excitation γ-rays in coincidence with scattered particles. The level schemes and
transition probabilities are determined for low-lying excited states in 12Be. The present paper presents a brief review of the spectroscopic results, which may be associated with the N = 8 shell quenching near the drip line.
Received: 1 May 2001 / Accepted: 4 December 2001 相似文献
2.
B. Fornal R. Broda W. Królas T. Pawłat J. Wrzesiński P.J. Daly P. Bhattacharyya Z.W. Grabowski C.T. Zhang D. Bazzacco S. Lunardi C. Rossi Alvarez G. de Angelis D.R. Napoli 《The European Physical Journal A - Hadrons and Nuclei》1998,1(4):355-357
Prompt and delayed γ-rays in nuclei of the 208Pb region produced in 450 MeV 76Ge +208Pb collisions have been studied at GASP. Yrast states above the α-decaying isomer in 211Po have been located including a 0.25 μs 31/2− isomer at 2135 keV and a 2 μs isomer at 4874 keV.
Received: 22 September 1997 相似文献
3.
M. Rejmund K.H. Maier R. Broda B. Fornal M. Lach J. Wrzesiński J. Blomqvist A. Gadea J. Gerl M. Górska H. Grawe M. Kaspar H. Schaffner C. Schlegel R. Schubart H.J. Wollersheim 《The European Physical Journal A - Hadrons and Nuclei》1998,1(3):261-266
High spin states in nuclei around 208Pb were populated in deep inelastic collisions of 76Ge, 136Xe, and 208Pb projectiles with 208Pb targets at beam energies about 12% above the Coulomb barrier. New states in 209Pb were found by measuring γ-γ-coincidences. They are interpreted as the yrast states that originate from the coupling of
one neutron to the lowest excitations of the 208Pb core. The results are discussed in the frame of the shell model.
Received: 22 November 1997 相似文献
4.
R. Krücken S.J. Asztalos R.M. Clark M.A. Deleplanque R.M. Diamond P. Fallon I.Y. Lee A.O. Macchiavelli G.J. Schmid F.S. Stephens K. Vetter Jing-Ye Zhang 《The European Physical Journal A - Hadrons and Nuclei》2001,10(2):151-155
High-spin states in 112Pd were studied using prompt γ-ray spectroscopy with Gammasphere following heavy-ion-induced fission in the reaction 18O + 208Pb at 91 MeV. A new 8+ level at 2638 keV was discovered with transitions connecting it to the yrast band and the quasi-gamma band. The three, now
established, closely spaced 8+ states indicate a mixing between the ground-state band, s-band, and quasi-gamma band. Several high-spin structures with likely negative parity have been extended to higher spin and
it is proposed that they are based on the νh
11/2(g
7/2
d
5/2) and νh
11/2(s
1/2
d
3/2) configurations.
Received: 28 November 2000 / Accepted: 8 February 2001 相似文献
5.
S.W. Ødegård B. Herskind T. Døssing G.B. Hagemann D.R. Jensen G. Sletten J.N. Wilson S. Leoni P.O. Tjøm P. Bednarczyk D. Curien 《The European Physical Journal A - Hadrons and Nuclei》2002,14(3):309-316
High-spin properties of the triaxial strongly deformed potential well in 163Lu at excitation energies above resolvable bands have been investigated. Gated E
γ-E
γ spectra display clear ridges with moments of inertia corresponding to those observed for the discrete strongly deformed bands.
A fluctuation analysis of the ridges yields a number of two-step paths of ≈ 40 and ≈ 20, when gating on triaxial strongly
or normally deformed bands, respectively. These results show that a potential well at large deformation coexists with the
normally deformed well, and indicate a mixing between states in the two wells at higher excitation energy.
Received: 4 January 2002 / Accepted: 6 May 2002 相似文献
6.
M. Rejmund K. H. Maier R. Broda B. Fornal M. Lach J. Wrzesiński J. Blomqvist A. Gadea J. Gerl M. Górska H. Grawe M. Kaspar H. Schaffner Ch. Schlegel R. Schubart H. J. Wollersheim 《The European Physical Journal A - Hadrons and Nuclei》2000,8(2):161-164
High-spin states in 202Pb and 203Pb have been investigated by in-beam γ-ray spectroscopy following the reaction 198Pt(9Be,xn). A search for magnetic rotational bands in these isotopes confirmed one of the two bands previously assigned to 202Pb and revealed a new band in this isotope. No evidence for magnetic rotation has been found in 203Pb.
Received: 24 July 2000 / Accepted: 28 September 2000 相似文献
7.
M. Lach P. Bednarczyk A. Bracco J. Grębosz M. Kadłuczka N. Kintz A. Maj J.C. Merdinger W. Męczyński J.L. Pedroza N. Schulz M.B. Smith K.M. Spohr J. Styczeń J.P. Vivien M. Ziębliński 《The European Physical Journal A - Hadrons and Nuclei》2001,12(4):381-382
High-spin states of the 44Ca nucleus populated in the 68 MeV 18O + 30Si reaction have been studied in a γ-γ-recoil coincidence experiment. The level scheme of 44Ca has been extended up to 12.2 MeV. In particular, the negative-parity band has been identified with the highest I = 13- level at 10.6 MeV. This state is interpreted as the band-terminating state for the ( d
3/2
-1
f
7/2
5) configuration.
Received: 7 November 2001 / Accepted: 3 December 2001 相似文献
8.
C. Andreoiu D. Rudolph I. Ragnarsson C. Fahlander R.A.E. Austin M.P. Carpenter R.M. Clark J. Ekman R.V.F. Janssens T.L. Khoo F.G. Kondev T. Lauritsen T. Rodinger D.G. Sarantites D. Seweryniak T. Steinhardt C.E. Svensson O. Thelen J.C. Waddington 《The European Physical Journal A - Hadrons and Nuclei》2002,14(3):317-348
High-spin states in 59Cu were populated using the fusion-evaporation reaction 28Si + 40Ca at a beam energy of 122 MeV. The Gammasphere Ge-detector array in conjunction with the 4π charged-particle detector array
Microball allowed for the detection of γ-rays in coincidence with evaporated light particles. The resulting extensive high-spin
decay scheme of 59Cu is presented, which comprises more than 320 γ-ray transitions connecting about 150 excited states. Their spins and parities
have been assigned via directional correlations of γ-rays emitted from oriented states. Average quadrupole moments of rotational
bands have been determined from the analysis of residual Doppler shifts. Shell model calculations in the fp shell are invoked to study some of the low-spin states, while the experimental characteristics of the rotational bands are
analyzed in the configuration-dependent cranked Nilsson-Strutinsky (CNS) approach.
Received: 15 February 2002 / Accepted: 23 April 2002 相似文献
9.
D. Hojman M.A. Cardona D.R. Napoli S.M. Lenzi C.A. Ur G. Lo Bianco C.M. Petrache M. Axiotis D. Bazzacco J. Davidson M. Davidson M. De Poli G. de Angelis E. Farnea T. Kroell S. Lunardi N. Marginean T. Martınez R. Menegazzo B. Quintana C. Rossi Alvarez 《The European Physical Journal A - Hadrons and Nuclei》2001,10(3):245-248
High-spin states in 178Ir were investigated by means of in-beam γ-ray spectroscopy techniques using the multidetector array GASP. Excited states
of 178Ir were populated through the 159Tb(24Mg, 5n) fusion-evaporation reaction at E(24
Mg) = 131-141 MeV. Several rotational bands were observed. Among them, the πi
13/2⊗νi
13/2 structure has been identified up to spin 36 ?. This band exhibits an anomalous signature splitting and a signature inversion
around spin 25 ?.
Received: 13 December 2000 / Accepted: 11 April 2001 相似文献
10.
M. Weiszflog G. de Angelis A. Axelsson D. Bazzacco F. Becker M. De Poli J. Eberth C. Fahlander A. Gadea S. Lunardi D.R. Napoli J. Nyberg C. Rossi Alvarez B. Rubio D. Rudolph S. Skoda H.G. Thomas R. Wyss 《The European Physical Journal A - Hadrons and Nuclei》2001,11(1):25-38
High-spin states in the nuclei 63Ga and 65Ga were studied following the reaction 32S + 40Ca at a reaction energy of 125 MeV and using the GASP γ-ray spectrometer in combination with the ISIS charged-particle detector
system. In addition to low-lying negative-parity states with single-particle character, rotational-like cascades built on
the 9/2+ and 19/2- states have been observed in both nuclei. Sidebands with negative parity in 63Ga and positive parity in 65Ga could be established. The experimental results are compared with Total Routhian Surface calculations which describe the
nuclei as moderately deformed (β2≈ 0.25) and γ soft at low rotational frequencies. The highest experimentally observed positive-parity state in 65Ga (41/2+) is in good agreement with the calculated crossing of the collective band with a non-collective one terminating at this spin.
Received: 20 December 2000 / Accepted: 2 May 2001 相似文献
11.
Ts. Venkova M. -G. Porquet A. Astier I. Deloncle P. Petkov A. Prévost F. Azaiez A. Bogachev A. Buta D. Curien O. Dorvaux G. Duchêne J. Durell B. J. P. Gall M. Houry F. Khalfallah R. Lucas M. Meyer I. Piqueras N. Redon A. Roach M. Rousseau O. Stézowski Ch. Theisen 《The European Physical Journal A - Hadrons and Nuclei》2005,26(3):315-319
High-spin states of the N = 87 nuclei, 147Nd and 145Ce, have been populated in the 12C + 238U and 18O + 208Pb fusion-fission reactions at 90 MeV and 85 MeV bombarding energy, respectively. The emitted γ-radiation was detected using
the Euroball III and IV arrays. High-spin states of the 147Nd isotope have been identified for the first time. The high-spin yrast and near-to-yrast structures of the 145Ce nucleus have been considerably extended. The newly observed structures, discussed by analogy with the neighbouring isotones,
show the coupling of an h9/2 neutron to the quadrupole and octupole excitations of the core. 相似文献
12.
H. Röpke J. Brenneisen M. Lickert 《The European Physical Journal A - Hadrons and Nuclei》2002,14(2):159-167
Eight high-spin states in 36Ar below 10MeV excitation energy, among them a prospective J
π = 8- state at 9408keV and the J? 8 levels of the recently discovered superdeformed rotational band, have been observed by n-γ coincidence measurements with
the 33S(α, nγ) reaction at E
α = 14.4 and 13.4MeV. High-spin assignments of, respectively, J
π = 6+ and 5- were obtained for the E
p = 1209 and 1462keV (E
x = 9682 and 9927keV) resonances of the 35Cl (p,γ) reaction by a measurement of γ-ray angular distributions. The spectrum of the high-spin and of the E
x? 7.4MeV levels is decomposed according to the underlying shell model configurations with n = 0, 1, 2, 4 particles excited from the N = 2 into the N = 3 major shell. The role of four-particle excitations, all connected with large prolate distortions, is elucidated for the
entire A = 36-40 mass region.
Received: 21 December 2001 / Accepted: 25 March 2002 相似文献
13.
T. Shizuma K. Furuno K. Hata H. Ishiyama T. Jumatsu M. Kato T. Komatsubara K. Matsuura Y. Sasaki K. Uchiyama T. Hayakawa 《The European Physical Journal A - Hadrons and Nuclei》1998,1(3):245-246
High-spin states in 183Os have been studied by means of in-beam γ-ray spectroscopy. Two isomers with I
π= ((43/2)−) and (43/2)+ have been identified at excitation energies of E
x
= 5.068 and 5.168 MeV. The half-lives are determined as T
1/2= 27 ± 3 and 24 ± 2 ns.
Received: 22 December 1997 相似文献
14.
R.M. Lieder T. Rzaca-Urban H. Brands W. Gast H.M. Jäger L. Mihailescu Z. Marcinkowska W. Urban T. Morek Ch. Droste P. Szymański S. Chmel D. Bazzacco G. Falconi R. Menegazzo S. Lunardi C. Rossi Alvarez G. de Angelis E. Farnea A. Gadea D.R. Napoli Z. Podolyak Ts. Venkova R. Wyss 《The European Physical Journal A - Hadrons and Nuclei》2002,13(3):297-305
High-spin states in 142Gd have been populated by means of the 99Ru(48Ti, 2p3n) reaction at 240 MeV and investigated with the γ-spectrometer EUROBALL III and the charged-particle detector array
ISIS. The features of four dipole bands have been determined and compared with tilted-axis cranking model calculations indicating
that they are magnetic rotational bands. A transition from regular to irregular bands has been found approaching N = 82 demonstrating that this is a general phenomenon in nuclei near a double-shell closure.
Received: 9 December 2001 / Accepted: 9 January 2002 相似文献
15.
A.N. Wilson C.W. Beausang N. Amzal D.E. Appelbe S. Asztalos P.A. Butler R.M. Clark P. Fallon A.O. Macchiavelli 《The European Physical Journal A - Hadrons and Nuclei》2000,9(2):183-189
High-spin states in neutron-rich nuclei, populated following deep-inelastic multi-nucleon transfer, have been studied using
the GAMMASPHERE array at the LBNL, USA. A 64Ni beam at an energy ∼ 15% above the Coulomb barrier was incident upon a thick 208Pb target, leading to the population of more than 130 different nuclei. The strongest channels correspond to nuclei close
to the projectile and target, although transfer of up to 50 nucleons has been observed. New high-spin states in neutron-rich
60,62Fe and 68,70,72Zn nuclei have been observed. Some limitations of this method of high-spin spectroscopy are discussed, including the apparent
difficulty of populating odd-odd and odd-even isotopes via this type of reaction. The data have been searched for superdeformed
(SD) states in the A = 190-200 region, but no evidence for their presence has been found.
Received: 14 April 2000 / Accepted: 12 September 2000 相似文献
16.
An effective residual interaction between particles and holes for shell model calculations around 208Pb, derived from the interaction between free nucleons, is compared with the measured properties of proton-hole neutron states
in 208Tl and the interaction between proton holes is adjusted to newly measured level energies in 206Hg. These interaction elements are particularly relevant for neutron-rich nuclei. The adjustment of two mixing elements reproduces
the known γ-decay data in 208Tl.
Received: 2 April 2002 / Accepted: 2 May 2002 相似文献
17.
C.-B. Moon T. Komatsubara T. Shizuma Y. Sasaki H. Ishiyama T. Jumatsu K. Furuno 《The European Physical Journal A - Hadrons and Nuclei》1999,5(1):13-16
High-spin states in 117I have been studied via the 103Rh(18O, 4n) reaction at a beam energy of 85 MeV. Many deformed rotational bands built on the proton h11/2, g7/2, and g9/2 orbitals have been identified. Among them, an unfavoured rotational band and a quasi-gamma band based on the h11/2 state have been newly observed. Moreover, positive-parity states above Iπ= 35/2+ reported in the previous work have been rearranged. Several energetically favoured states have been assigned to noncollective
oblate states based on various quasiparticle configurations with β2≈ 0.18–0.19 and γ= 60°.
Received: 1 March 1999 相似文献
18.
D. Bucurescu Gh. Căta-Danil I. Căta-Danil M. Ivaşcu N. Mărginean C. Rusu L. Stroe C.A. Ur A. Gizon J. Gizon B. Nyakó J. Timár L. Zolnai A.J. Boston D.T. Joss E.S. Paul A.T. Semple C.M. Parry 《The European Physical Journal A - Hadrons and Nuclei》2001,10(3):255-258
High-spin states in the 96Tc nucleus have been studied with the reactions 82Se(19F,5nγ) at 68 MeV and Zn(36S,αpxn) at 130 MeV. Two γ-ray cascades (irregular bandlike structures) have been observed up to an excitation energy of about 10
MeV and spin 21-22?.
Received: 19 January 2001 / Accepted: 30 March 2001 相似文献
19.
H. Tiesler H. Klein A. Fitzler I. Wiedenhöver P. von Brentano 《The European Physical Journal A - Hadrons and Nuclei》2000,9(2):157-160
High-spin states in 143Pm have been investigated via the 128Te(19F,4nγ)143Pm reaction using techniques of in-beam γ-spectroscopy. γ-ray singles, γ-γ coincidences, γ-ray anisotropies and DCO ratios
have been measured. Based on these measurements, the level scheme of 143Pm has been extended up to an excitation energy of 10535.4 keV, including 48 new γ-rays deexciting 28 new levels. The yrast
levels in 143Pm can be understood qualitatively in the framework of a weak-coupling model.
Received: 10 July 2000 / Accepted: 12 October 2000 相似文献
20.
T. Bäck B. Cederwall R. Wyss A. Johnson J. Cederkäll M. Devlin J. Elson D.R. LaFosse F. Lerma D.G. Sarantites R.M. Clark P. Fallon I.Y. Lee A.O. Macchiavelli R.W. Macleod 《The European Physical Journal A - Hadrons and Nuclei》1999,6(4):391-397
High-spin states in 88Mo were studied using the Gammasphere germanium detector array in conjunction with the Microball CsI(Tl) charged-particle
detector system. Three γ-ray cascades with dynamic moments of inertia showing similar characteristics to superdeformed rotational
bands observed in the neighbouring A= 80 region have been identified and assigned to the nucleus 88Mo. The quadrupole moment of the strongest band, deduced by the Residual Doppler Shift Method, corresponds to a quadrupole
deformation of β2≈ 0.6. This confirms the superdeformed nature of this band. The experimental data are interpreted in the framework of total
routhian surface calculations. All three bands are assigned to two-quasi-particle proton configurations at superdeformed shape.
Received: 20 May 1999 / Revised version: 25 August 1999 相似文献