Level structures of reactions and analysis of the bands in the IBF model

Barci, V.; Gizon, J.; Gizon, A.; Crawford, J. E.; Genevey, J.; PŁlochocki, A.; Cunningham, M.A.

doi:10.1016/0375-9474(82)90455-9

Cited by 30 publications

(13 citation statements)

References 14 publications

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“…4,196.0, 280.1 and 459.7 keV decay with (122_3)s while the other group with the 153.9, 239.6, 355.9 and 427.1 keV lines presents a (155_4)s half-life. It is known from in-beam experiments [1] that the 179.4 and 196.0 keV lines are associated with highspin band structures so the (122_+ 3)s half-life has been assigned to the 12~"Cs(9/2+) and the other one, (155 _+4)s, to the 121~Cs(3/2 +) decay. In addition to these rectilinear decay curves, many others are quite complex and reflect feedings from both lZ~Cs species.…”

Section: Resultsmentioning

confidence: 99%

“…The negative parity system, including the 7/2-, 9/2-, 21/2-and 13/2-states identified as the hll/2 yrast band from in-beam experiments [1], is well fed in the present decay. The E1 multipolarity of the strong 196.0 keV transition which deexcites this band is confirmed by conversion electron measurements.…”

Section: The 121xe Level Schemementioning

confidence: 96%

“…Indeed, with its (M1+2% E2) multipolarity, the number of 38.4 keV transitions reaches only 413_+50 while the 196 keV one is 1033_+ 100, in the relative gamma intensity scale used in Table 1. Taking into account the previous (5.5 _+ 0.5)ns value [1] and the present one (8 + 2) ns, a mean value of 6 ns has been reported in the level scheme for the 196 keV state. The E 1 transition is strongly hindered: 6.1 (7) x 10-6 w.u.…”

Section: The 121xe Level Schemementioning

confidence: 97%

“…A weak 55 keV transition has been observed between the 9/2-(at 234.4 keV) and the 7/2 + (at 179.4 keV). From 121Xe inbeam experiments [1] this 7/2 + state was considered as the basis of the g7/2 positive parity band previously identified in the heavier odd-A Xe. From the present work, there is no argument to assign a special role to this 7/2 + state and a positive parity band based upon the 5/2 + ground state can be retained for the levels at 179.4, 414.1 and 670.2 keV.…”

Section: The 121xe Level Schemementioning

confidence: 99%

“…In odd-A Xe nuclei, systematics of the negative-parity states obtained by inbeam experiments is understood as based on the coupling of an hip 2 quasi-neutron hole to the even-even cores [1][2][3]. These negative parity bands observed from 133x.r~ to l19y~ 541~t,79 54zx~65 are mainly governed by the position of the Fermi energy in the h~/z shell, going from the nearly empty shell (N=79-77) to approximately the middle of the shell (N = 67 -65).…”

Section: Introductionmentioning

confidence: 99%

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Non-yrast level structure of121Xe via beta decay of121m+g Cs

Genevey

Gizon

Marguier

et al. 1991

Z. Physik A - Hadrons and Nuclei

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The results of measurements of the gamma-ray and conversion-electron singles and coincidence spectra from the decay of the 122 s leJmCS and the 155 s 12~gCs to levels of ~2~Xe are reported. The M3 multipolarity of the 68.5 keV isomeric transition in 12~Cs has been deduced. Numerous low-lying levels below 1.6 MeV excitation energy are found. A negative-parity level at 355.9 keV is observed for the first time. The results supplement the low lying energy level systematics in odd-A xenons. A comparison is made with the N = 67 barium isotone.

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Section: Resultsmentioning

confidence: 99%

Section: The 121xe Level Schemementioning

confidence: 96%

Section: The 121xe Level Schemementioning

confidence: 97%

Section: The 121xe Level Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Non-yrast level structure of121Xe via beta decay of121m+g Cs

Genevey

Gizon

Marguier

et al. 1991

Z. Physik A - Hadrons and Nuclei

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Observation of high spin states in117Xe

Liu

Sun

Zhou

et al. 1995

Z. Physik A - Hadrons and Nuclei

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High spin states of ll7Xe have been investigated by means of in-beam ,/-ray spectroscopy using the reaction 92Mo(28Si, 2pn) at beam energies of 100 to 120 MeV. The previously known Vhll/2 bands are confirmed and the vgT/2 favored-signature band is extended up to 47/2 + , in which two band crossings are observed at ~co=0.33 and 0.44 MeV, respectively. Two new positive-parity bands have been established, one of which is most likely the vgT/2 unfavored-signature band. A new transition cascade with irregular level spacings is also observed.PACS numbers: 21.10. Re, 23.20.Lv, 27.60.+j The neutron-deficient transitional nuclei with A~120, which are moderately deformed and ,/-soft, are of considerable interest in recent theoretical and experimental studies. A rich variety of nuclear structure effects, such as well developed collective rotational bands, shape coexistence, oblate collective band [1], and phenomena of shaping driving and band terminations at high spin [2,3], have been shown in this region. In light odd-A Xe isotopes, apart from the negative-parity Vhll/2 orbit, the positiveparity orbits vgT/2, vds/2 and vd3/2 lying near the Fermi surface, and a series of positive-parity bands have been established in these nuclei up to ll9Xe [4,5]. In previous work [6], only one vg7/2 positive-parity band consisting of five transitions was observed in llTXe.In the present work, the high spin states of ll7Xe were populated via the 92Mo(28Si, 2pn) reaction at the HI-13MV tandem accelerator, Beijing, using a 2 mg/cm 2 92Mo target (isotopically enriched to 94.1%) with a lead backing of 6 mg/cm 2. Excitation functions were measured in the energy region of 100 to 120 MeV and an optimal energy of 115 MeV was chosen for obtaining the u coincidence data. Seven BGO Compton surpressed HPGe detectors and a 14-element BGO crystal ball serving as a multiplicity falter were used to detect the `/-rays. About 90 million `/-`/ coincidence events were recorded on tapes and sorted off line into a symmetric 4k times 4k matrix from which gated background subtracted spectra were obtained. Average directional correlation (DCO) ratios were extracted from a DCO matrix in which coincidences from the Ge detectors at 90 ~ and 82 ~ were sorted against the detectors at _+35 ~ and +140 ~ . The proposed partial level scheme of llTXe from this work is shown in Fig. 1. Rotational bands labeled 3, 5 and 6, seen in the previous works [6,7], have been confirmed and extended. Three new bands 1, 2 and 4 have been assigned to ll7Xe mainly based on the 117Cs decay study ofref. [8].Band 5 and 6 represent the favored-and unfavoredsignature member of the Vhll/2 band, respectively. Band 6 is established two levels higher and show a sharp gain in the alignment. This indicates that its backbend frequency is around 0.41 MeV, somewhat smaller than that of 0.44 MeV observed in band 5. Our TRS calculation gives a shape of~ 2 = 0.229, 3, = -18 ~ for the c~ = -1/2 branch and of~ 2 = 0.231, `/= -10 ~ for c~ = 1/2, which leads to a large signature "splitting energy ...

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High-spin bands in117,119I and118Xe

Kerek¹,

Lönnroth

Honkanen

et al. 1984

Z Physik A

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Excited states in 11vI, 118Xe and 119I were populated in the reactions l~ 160 and 1~176~2C. The groundstate band in ~SXe was observed to its (18 +) member and the 11/2 bands in 117I and 119I to their (35/2-) and (43/2-) members, respectively.The structure of the bands in the I isotopes is interpreted as a rch11/2 proton coupled to an even-even band structure in Xe, and the band crossings observed in 11SXe and 119I are interpreted in the Cranked Shell Model framework as AB, of vh~ 1/2.Recently there have been many attempts to reach very neutron-deficient nuclides in the tin region, i.e. nuclei with Z~50 and 100

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Level structures of reactions and analysis of the bands in the IBF model

Cited by 30 publications

References 14 publications

Non-yrast level structure of121Xe via beta decay of121m+g Cs

Non-yrast level structure of121Xe via beta decay of121m+g Cs

Observation of high spin states in117Xe

High-spin bands in117,119I and118Xe

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