Multiple band structures of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Cs</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>131</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Sihotra, S.; Palit, R.; Naik, Z.; Singh, K. P.; Joshi, P. K.; Deo, A. Y.; Goswamy, J.; Malik, Sushma; Mehta, D.; Praharaj, C. R.; Jain, H. C.; Singh, Nirmal

doi:10.1103/physrevc.78.034313

Cited by 34 publications

(27 citation statements)

References 47 publications

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“…A number of three-QP bands have been observed in odd-mass iodine and cesium nuclei in this mass region [6,8,11,12,[31][32][33][34][35][36]. The band heads lie between 2.0-and 3.0-MeV excitation, with spins at ∼ 21/2.…”

Section: Three-quasiparticle Band Dmentioning

confidence: 93%

High-spin states in127I

et al. 2012

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In-beam γ spectroscopy of the stable nucleus 127 I has been studied experimentally using the 124 Sn( 7 Li, 4nγ ) 127 I reaction at a beam energy of 32 MeV. The high-spin level scheme of 127 I is extended significantly. Negative-parity levels built on the 11/2 − , πh 11/2 particle state are observed up to (35/2 − ) and described as a decoupled band, extending our knowledge of decoupled structures to the most neutron-rich stable iodine isotope. Two I = 2 yrast positive-parity sequences are proposed to be associated with the πg 7/2 configuration due to observations of several strong interband transitions, and two weakly populated I = 2 positive-parity bands are newly identified and interpreted as arising mainly from the πd 5/2 configuration. Three-quasiparticle configurations are assigned to the I π = 15/2 + and 23/2 + states according to the existing knowledge in neighboring nuclei; irregular noncollective and regular collective excitations built on these two (15/2 + and 23/2 + ) states are observed to coexist at similar energies. The observed three-quasiparticle band structures are further interpreted with the aid of configuration-constrained potential energy surface calculations.

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Section: Three-quasiparticle Band Dmentioning

confidence: 93%

High-spin states in127I

et al. 2012

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“…As the νh 11/2 and νd 5/2 orbitals with (Δl=3) being near the Fermi surface, octupole collectivity have been observed in the 55 Cs isotopes, viz., 122,131 Cs [6,7] and 141,143 Cs [32], and also in the neighboring 54 Xe [33,34,35] and 56 Ba [36,37] isotopes, where the πh 11/2 and νd 5/2 orbitals play an important role. The signature for such effects are interleaved positive and negative-parity bands connected by enhanced E1 transitions.…”

Section: Octupole Collectivity In 99 Pdmentioning

confidence: 99%

“…As the neutron h 11/2 and d 5/2 orbitals with Δl=3, Δ j = 1, and Δπ = −1, are near the Fermi surface, octupole collectivity will be enhanced in this region. It is worth mentioning that octupole collectivity has been observed in the Z = 55 region [6,7,8], where single quasiproton h 11/2 , g 7/2 , and d 5/2 bands have been observed at low excitation energy. The present work reports in-beam γ-ray spectroscopic measurements to study level structures in 98 Rh, 99 Rh and 99 Pd nuclides.…”

Section: Introductionmentioning

confidence: 99%

Nuclear structure studies close to N = Z = 50

Kumar¹,

Sihotra²,

Naik³

et al. 2014

AIP Conference Proceedings

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Abstract. The level structures in 98,99 Rh, and 99 Pd nuclei have been investigated through in beam γ-ray spectroscopic techniques following the 75 As( 28 Si, xpyn) fusion-evaporation reaction at E lab =120 MeV. These investigations were carried out using Indian-National-Gamma-Array (INGA) consisting of Compton-suppressed clover detectors at the Inter-University Accelerator Centre, New Delhi. The level structures observed in 99 Pd, and 98,99 Rh have been established up to ∼11 MeV, 10 MeV and 16 MeV excitation energy and spin∼ 23h, 23h, and 28h respectively. In the doubly-odd 98 Rh nucleus, new band structures and isomeric states have been identified at lower spins and new states below the previously identified 2 + ground state (T 1/2 = 8.5 m) are identified. In the present work 99 Rh structure have been observed similar to 101 Rh which is based on p 1/2 and g 9/2 orbitals. Various positive and negative parity states in these nuclei are observed to be energetically more favored with respect to the neighboring ones, and are likely to be the maximally aligned states obtained by angular momentum coupling of the valence particles (holes). The level structures observed in 99 Pd have been interpreted in the framework of a microscopic theory based on the deformed Hartree-Fock (HF) and angular momentum projection techniques. Band structures at low excitation energy are based on the low-Ω νg 7/2 and νd 5/2 orbitals, have been observed in 99 Pd. Band structure at higher spins are reproduced with the ν(g 7/2 ) 2 ⊗ ν(g 9/2 ) −1 ⊗ ν(h 11/2 ) 2 ⊗ π(g 9/2 ) 6 configurations. Observation of new E1 transitions linking the opposite parity νh 11/2 and νd 5/2 bands provide fingerprints of possible octupole correlations in 99 Pd.The extracted values of the B(E1)/B(E2) ratios for the lower levels in the νh 11/2 band are ∼ 10 −7 [fm] −2 .

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“…9 + corresponding to the 4612 keV level has been determined. From this plot, the mixing ratio is found to be δ = −66 (3) • for 1222 keV transition.…”

mentioning

confidence: 95%

“…Mainly, heavy-ion induced fusionreactions have been used to populate the high spins states of nuclei. The capability of the INGA, consisting of the Compton suppressed clover HPGe detectors, to measure the angular distribution, correlation and polarization of the gamma-rays plays a crucial role in the development of the level scheme of nuclei [2,3,4]. The higher photopeak efficiency of the array makes it possible to measure the lifetime of the weakly populated excited states using Doppler Shift Attenuation method (DSAM) [5] in the range of ∼ 10 f sec to ∼ 1 psec.…”

mentioning

confidence: 99%