Shape coexistence in the near-spherical<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow /><mml:mn>142</mml:mn></mml:msup></mml:math>Sm nucleus

Rajbanshi, S.; Bisoi, Abhijt; Nag, Somnath; Saha, S.; Sethi, J.; Trivedi, T.; Bhattacharjee, T.; Bhattacharyya, S.; Chattopadhyay, S.; Gangopadhyay, G.; Mukherjee, G.; Palit, R.; Raut, R.; Sarkar, M. Saha; Singh, A. K.; Goswami, A.

doi:10.1103/physrevc.89.014315

Cited by 32 publications

(31 citation statements)

References 66 publications

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“…A crossover E2 transition of energy 481.0-keV which was tentatively placed between the 51/2 (−) and 47/2 (−) states in Ref. [12], has been confirmed as inexistent from the present investigation. The investigations have established the MR character of DB I, as indicated in Ref.…”

Section: Mr Bands Have Been Observed In Several Mass Regionssupporting

confidence: 77%

“…Systematic uncertainty from stopping powers, that is expected to be of ≈ 5% has not been included in the quoted uncertainties (Table I). The dipole band structure DB III, consisting of the dipole transitions of regular energy spacing, has close similarity to the observed MR bands in the neighbouring weakly deformed nuclei 139,141,142 Sm, 141,143 Eu, and 142 Gd [27,28,[32][33][34][35]. The magnitude of the B(M 1) transition strength at the 51/2 − level of DB III is about three times shorter than the B(M 1) value at the 45/2 − state of DB I which has been identified as MR band in 143 Sm [10,11].…”

Section: Mr Bands Have Been Observed In Several Mass Regionssupporting

confidence: 65%

“…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]. The current work re-investigates this third dipole band in the nucleus which has been generated from the extremely asymmetric shears structure on the "phase boundary" of the two phases representing the quasiparticle excitation and deformed core rotation.…”

Section: Mr Bands Have Been Observed In Several Mass Regionsmentioning

confidence: 99%

“…The cross-over transitions 542.0, 802.0, 965.0 and 977.0-keV, have been confirmed to be of E2 nature from the R DCO and ∆ measurements. The cascade DB III was observed to feed the previously reported band DB I principally through the 632.4, and 888.2-keV transitions and to the 51/2 − level of DB II through the 457.0-keV transition [10][11][12]. The M 1/E2 nature of these transitions, indicated by the respective R DCO and ∆ values, together with the existing spin-parity assignments of DB I, has facilitated the conclusion on spin-parities of the (feeding) states in DB III.…”

Section: Mr Bands Have Been Observed In Several Mass Regionsmentioning

confidence: 99%

“…The small values of B(M 1) at the band head and its slowly falling trend along the band, at variance with the established MR sequences in the same nucleus, along with small B(E2) values, indicative of weak deformation, may be perceived as an interplay of the shears mechanism and the collective rotation associated with the DB III sequence in 143 Sm. The Shears mechanism with the Principal Axis Cranking (SPAC) model [10,11,27,28,[32][33][34][35] has been identified as a powerful tool to explore the intrinsic character, quasiparticle configurations, and contribution of (deformed) core rotation in shears sequences. To achieve an quantitative measures of the core rotational contribution to the total angular momentum vector the SPAC model has been modified and the reduced energy of the state with reduced spin (Î = I/2j 1 ) has been expressed as [36],…”

Section: Mr Bands Have Been Observed In Several Mass Regionsmentioning

confidence: 99%

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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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Section: Mr Bands Have Been Observed In Several Mass Regionssupporting

confidence: 77%