High spin states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Sm</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>143</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Raut, R.; Ganguly, S.; Kshetri, R.; Banerjee, P.; Bhattacharya, S.; Dasmahapatra, B.; Mukherjee, A.; Mukherjee, G.; Sarkar, M. Saha; Goswami, A.; Gangopadhyay, G.; Mukhopadhyay, S.; Krishichayan,; Chakraborty, A.; Ghughre, S. S.; Bhattacharjee, T.; Basu, Swapan

doi:10.1103/physrevc.73.044305

Cited by 23 publications

(17 citation statements)

References 28 publications

(52 reference statements)

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“…1. In the previous study [13] the spin-parity assignments of the associated levels were tentative owing to the large uncertainities or impossibilities in the R DCO and polarization asymmetry measurements of the transitions, such as 126 keV, leading to the dipole band. In the current investigation, a 490.8 keV transition has been observed de-exciting the same 7517 keV level as the 126 keV transition.…”

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confidence: 98%

“…The present paper reports such a study in the 143 Sm (Z = 62, N = 81) nucleus. The nucleus was previously studied by Raut et al [13] using heavy-ion induced fusion-evaporation reaction and an array of six Compton suppressed Clover detectors as the detection system. A dipole band, with a band-head energy of ∼ 8.6 MeV and tentative spin-parity 43/2 − was reported therein.…”

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confidence: 99%

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Abrupt phase change of the core rotation in the 143 Sm nucleus

Rajbanshi,

Raut,

Pai

et al. 2017

Preprint

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Dipole sequences in the 143 Sm nucleus have been investigated via the 124 Sn ( 24 Mg, 5n) reaction at E lab = 107 MeV using the Indian National Gamma Array (INGA). The spin-parity of the associated levels have been firmly established from the spectroscopic measurement. Level lifetimes of several levels in the dipole bands have been measured using the Doppler Shift Attenuation Method. The decreasing trend of the measured B(M 1) and B(E2) transition strengths in one of the sequence (DB I) spells out its origin as Magnetic Rotation (MR). The trends of B(M1) and B(E2) in DB I are reproduced well in the theoretical calculations using the Shears mechanism with the Principal Axis Cranking (SPAC) model. However, the calculations fail to reproduce the sharp rise in the B(M 1)/B(E2) ratio at the highest spins in DB I and the same has been interpreted from the decreasing of the core rotation along the sequence. The experimental observations along with the the theoretical calculations for the second dipole band (DB II), indicate that the core rotation, rather than the shears mechanism, is being favored for angular momentum generation. This represents a unique observation of forking of the shears band DB I from an abrupt phase change of the core from spherical into the deformed one.

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confidence: 98%

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confidence: 99%

Abrupt phase change of the core rotation in the 143 Sm nucleus

Rajbanshi,

Raut,

Pai

et al. 2017

Preprint

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“…Thus, for this configuration the double shear structure can exist. We have calculated the band head energy for the above configuration using a particle hole calculation in the relativistic mean field approach [43] using the blocked BCS method. The calculated energy of the band head is found to be 6.8 MeV whereas the corresponding observed value is 7.4 MeV.…”

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Antimagnetic rotation and sudden change of electric quadrupole transition strength in 143 Eu

et al. 2015

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Lifetimes of the states in the quadrupole structure in 143 Eu have been measured using the Doppler shift attenuation method and the parity of the states in the sequence has been firmly identified from polarization measurements using the Indian National Gamma Array. The decreasing trends of the deduced quadrupole transition strength B(E2) with spin, along with increasing J (2) /B(E2) values before the band crossing, conclusively establish the origin of these states as arising from antimagnetic rotation. The abrupt increase in the B(E2) values after the band crossing in the quadrupole band, a novel feature observed in the present experiment, may possibly indicate the crossing of different shears configurations resulting in the re-opening of a shears structure. The results are reproduced well by numerical calculations within the framework of a semi-classical geometric model.

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“…In the light of the aforementioned prospects, the 143 Sm (Z = 62, N = 81) nucleus has been investigated in the present work. Recently, two dipole bands, DB I and DB II, have been reported in the level structure of the nucleus above an excitation energy of E x = 8614-keV [9][10][11]. Recent investigation reveals another dipole band almost degenerate in energy with the DB II without measurements of polarization and transition rates leading the interpretation only tentative [12].…”

Section: Mr Bands Have Been Observed In Several Mass Regionsmentioning

confidence: 99%

Extremely asymmetric shears band in Sm143

et al. 2018

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A dipole sequence has been observed and investigated in the 143 Sm nucleus populated through the heavy-ion induced fusion-evaporation reaction and studied using the Indian National Gamma Array (INGA) as the detection system. The sequence has been established as a Magnetic Rotation (MR) band primarily from lifetime measurements of the band members using the Doppler Shift Attenuation Method (DSAM). A configuration based on nine quasiparticles, with highly asymmetric angular momentum blades, has been assigned to the shears band in the light of the theoretical calculations within the framework of Shears mechanism with the Principal Axis Cranking (SPAC) model. This is hitherto the maximum number of quasiparticles along with the highest asymmetricity associated with a MR band. Further, as it has followed from the SPAC calculations, the contribution of the core rotation to the angular momentum of this shears band is substantial and greater than in any other similar sequence, at least in the neighbouring nuclei. This band can thus be perceived as a unique phenomenon of shears mechanism in operation at the limits of quasiparticle excitations, as manifested in MR band-like phenomena, evolving into collectivity.Recent experimental and theoretical studies on the weakly deformed nuclei, with a very few particles and holes outside the core, unambiguously establish [1-4] the "shears mechanism" as a general phenomenon of generating angular momentum in them. The shears mechanism in these nuclei, manifested in form of the magnetic rotational (MR) bands, has been observed in their level structures. These bands are characterized by strong intraband M1 transitions and weak/unobserved cross-over E2 transitions, the latter being commensurate with the small deformations of these nuclei. The band-head corresponds to the perpendicular alignment of the angular momentum vectors generated by the particle and the holes constituting the band configuration. The repulsive interaction between the particle and holes favours the perpendicular coupling, for minimum energy at the bandhead. Excited states with higher angular momenta along the MR band are generated by the gradual alignment of the angular momentum vectors that may eventually completely align to produce the maximum spin accompanied by the termination of the MR band [5].The mid-shell nuclei, on the other hand, have considerable number of valence nucleons outside the core that is consequently deformed owing to the polarizing effect of the former. The deformation breaks the rotational sym- * Electronic address: subhphy@gmail.com † Electronic address: h.pai@saha.ac.in metry and leads to the observation of the so-called rotational bands in the level structure of the corresponding nuclei. This may be perceived as a transition in the characteristic excitation pattern of the nuclei with increasing number of valence nucleons outside the core. The weakly deformed systems with a few valence particles exhibiting MR-bands, or similar single particle features, evolves into well deformed nuclei with in...

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High spin states inSm143

Cited by 23 publications

References 28 publications

Abrupt phase change of the core rotation in the 143 Sm nucleus

Abrupt phase change of the core rotation in the 143 Sm nucleus

Antimagnetic rotation and sudden change of electric quadrupole transition strength in 143 Eu

Extremely asymmetric shears band in Sm143

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