The deformation driving tendency of various single particle orbitals near the Fermi surface has been investigated with the lifetime measurements of high spin states in the non-yrast bands of ^(177)Re nucleus.For this ...The deformation driving tendency of various single particle orbitals near the Fermi surface has been investigated with the lifetime measurements of high spin states in the non-yrast bands of ^(177)Re nucleus.For this study,the ^(165)Ho(^(16)O,4n)^(177) Re reaction at a beam energy of 84 MeV was used.Lifetimes of four lowest levels in theπi13/2[660] 1/2^(+)band and four levels in the πd_(5/2)[402]5/2^(+)(α=-1/2) band were measured.The extracted transition quadrupole moments for the πi13/2intruder band showed a sharp increase with increasing level spin,indicating a significant shape transition in the nucleus.The average transitional quadrupole moment(Q_(t)),a measure of deformation,for the πi_(13/2) band was significantly larger(Q_(t)~8.7(6) eb) compared with the πd5/2(Q_(t)~6.3(5) eb) band.To interpret the observed shape changes in the two bands,the experimental transition probabilities for these bands were compared with the re sults obtained from Projected Shell Model(P SM) calculations.展开更多
The neutron deficient Xe nuclei with A≈120 are predicted to have strong octupole correlation at low spins.In the present study,an attempt was made to improve upon the level scheme and also to examine the signatures o...The neutron deficient Xe nuclei with A≈120 are predicted to have strong octupole correlation at low spins.In the present study,an attempt was made to improve upon the level scheme and also to examine the signatures of octupole correlation in^(118)xe via high spin γ-ray spectroscopy.High spin states in^(118)Xe have been populated via the^(93)Nb(^(28)Si,p2n)^(118)Xe fusion-evaporation reaction at a beam energy of 115 MeV provided by the 15 UD pelletron accelerator facility at IUAC,New Delhi.In the experiment,seven newγ-transitions have been found and placed appropriately in the level scheme.A theoretical study using the triaxial projected shell model(TPSM)approach suggests that the first bandcrossing is due to the alignment of two neutrons,and a parallel band tracking the yrast configuration is the γ-band built on the two-quasiparticle state.Enhanced E1 transition rates measured between opposite parity bands involving vh_(11/2)and vd_(5/2)orbitals having△j=△l=3 indicate the presence of octupole correlation in this nucleus.展开更多
基金Supported by the Science and Education Research Board (SERB) of the Department of Science and Technology, Government of India (CRG/2018/003-495)the financial assistance from the University Grants Commission (UGC), India+1 种基金the Science and Engineering Research Board (SERB), Department of Science and Technology (Govt. of India) for providing financial assistance under Project (CRG/2019/004960) to carry out a part of the present research workThe financial support provided by the Institute of Eminence (IoE), Delhi University under FRP Grant 2022-23。
文摘The deformation driving tendency of various single particle orbitals near the Fermi surface has been investigated with the lifetime measurements of high spin states in the non-yrast bands of ^(177)Re nucleus.For this study,the ^(165)Ho(^(16)O,4n)^(177) Re reaction at a beam energy of 84 MeV was used.Lifetimes of four lowest levels in theπi13/2[660] 1/2^(+)band and four levels in the πd_(5/2)[402]5/2^(+)(α=-1/2) band were measured.The extracted transition quadrupole moments for the πi13/2intruder band showed a sharp increase with increasing level spin,indicating a significant shape transition in the nucleus.The average transitional quadrupole moment(Q_(t)),a measure of deformation,for the πi_(13/2) band was significantly larger(Q_(t)~8.7(6) eb) compared with the πd5/2(Q_(t)~6.3(5) eb) band.To interpret the observed shape changes in the two bands,the experimental transition probabilities for these bands were compared with the re sults obtained from Projected Shell Model(P SM) calculations.
基金the contribution of the INGA collaboration,which is partially funded by the Department of Science and Technology(DST,GoIproject no.IR/S2/PF-03/2003-I)+4 种基金University Grants Commission(UGC)supported by IUAC,New Delhi(Grant No.IUAC/XIII/7/UFR-63302)financial support from the University Grants Commission(UGC),Indiathe Department of Science and Technology,Govt.of India for providing financial support under Project no.CRG/2019/004960 to carry out a part of the research workthe financial support received from SERB,INDIA under N-PDF scheme vide reference no.PDF/2022/001829
文摘The neutron deficient Xe nuclei with A≈120 are predicted to have strong octupole correlation at low spins.In the present study,an attempt was made to improve upon the level scheme and also to examine the signatures of octupole correlation in^(118)xe via high spin γ-ray spectroscopy.High spin states in^(118)Xe have been populated via the^(93)Nb(^(28)Si,p2n)^(118)Xe fusion-evaporation reaction at a beam energy of 115 MeV provided by the 15 UD pelletron accelerator facility at IUAC,New Delhi.In the experiment,seven newγ-transitions have been found and placed appropriately in the level scheme.A theoretical study using the triaxial projected shell model(TPSM)approach suggests that the first bandcrossing is due to the alignment of two neutrons,and a parallel band tracking the yrast configuration is the γ-band built on the two-quasiparticle state.Enhanced E1 transition rates measured between opposite parity bands involving vh_(11/2)and vd_(5/2)orbitals having△j=△l=3 indicate the presence of octupole correlation in this nucleus.
