P. G. Varmette

Mississippi State University

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J. H. Hamilton

Vanderbilt University

R. V. F. Janssens

University of North Carolina at Chapel Hill

M. P. Carpenter

Argonne National Laboratory

J. K. Hwang

Vanderbilt University

B. Herskind

Indian Institute of Technology BHU

J. Kormicki

Vanderbilt University

A. V. Daniel

Joint Institute for Nuclear Research

M. W. Drigert

Idaho National Laboratory

Yu. Ts. Oganessian

Joint Institute for Nuclear Research

B. R. S. Babu

University of Calicut

Cooperative Institutions

Argonne National Laboratory

Vanderbilt University

Lawrence Berkeley National Laboratory

Mississippi State University

Lawrence Livermore National Laboratory

Centre National de la Recherche Scientifique

Oak Ridge National Laboratory

Florida State University

Idaho National Laboratory

Institut National de Physique Nucléaire et de Physique des Particules

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Identification of 181Hg and shape coexistence in odd-A Hg isotopes

Physics Letters B (1997)

P. G. Varmette D.T. Shidot Wenchao Ma A. V. Ramayya R. V. F. Janssens

In-beam γ-ray transitions in 181Hg, the lightest odd-A Hg isotope known thus far, have been identified from fragment mass-γ and γ-γ coincidence measurements. Five prolate deformed rotational bands were placed in the level scheme. A decoupled band built on the strongly prolate deformed 12−[521] ground state was observed up to 292−. A 52−[512] configuration is suggested for a pair of strongly coupled bands displaying no signature splitting. The other two bands are also signature partner bands. They are populated with the largest intensity and exhibit splitting. They have been associated with the mixed neutron i132 orbitals and are proposed to decay to an i132 isomeric state associated with an oblate state.

Identification

10.1016/s0370-2693(97)01035-6

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Citations (17)

Characteristics of a segmented clover germanium detector in a fusion-evaporation reaction with low γ multiplicity

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2000)

S. Bouneau M. G. Porquet G. Sletten N. Hashimoto Tadashi Saitoh

Multiplicity (mathematics)

Semiconductor detector

10.1016/s0168-9002(99)01089-x

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Citations (11)

Rotational bands in101–103Nband98,100

Physical Review C (1998)

J. K. Hwang A. V. Ramayya J. Gilat J. H. Hamilton L.K. Peker

Several $\ensuremath{\gamma}$ transitions in ${}^{101--103}\mathrm{Nb},{ }^{98,100}\mathrm{Y},{ }^{146}\mathrm{La},$ and ${}^{149}\mathrm{Pr}$ are identified from spontaneous fission studies employing a ${}^{252}\mathrm{Cf}$ source and the Gammasphere detector array. In particular, the pairing-free bands in ${}^{100}\mathrm{Y}$ and ${}^{102}\mathrm{Nb}$ are extended, two rather highly deformed negative-parity bands feeding the 4.3-s $\ensuremath{\beta}$-decaying isomer of ${}^{102}\mathrm{Nb}$ are identified, and their possible bandhead configurations are discussed. In the case of ${}^{101,103}\mathrm{Nb},$ we have extended previously reported level schemes by over 20 transitions in each nuclide. For the fission partners ${}^{146}\mathrm{La}$ and ${}^{149}\mathrm{Pr}$ we have elucidated their previously unreported yrast level schemes.

Gammasphere

10.1103/physrevc.58.3252

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Citations (73)

Co-existing coupling schemes at high spin in 166Hf

The European Physical Journal A (2000)

David R. Jensen J. Domscheit G.B. Hagemann M. Bergström B. Herskind

Bar (unit)

Antiparticle

Lattice (music)

10.1007/s100530050022

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Citations (17)

Cold (neutronless)αternary fission of252Cf

Physical Review C (1998)

A. V. Ramayya J. H. Hamilton J. K. Hwang L.K. Peker J. Kormicki

The phenomenon of cold (neutronless) alpha ternary fission in spontaneous fission of ${}^{252}$Cf was experimentally observed by triple gamma coincidence technique with Gammasphere with 72 gamma-ray detectors. Correlated pairs of ${}_{36}$Kr-${}_{60}$Nd, ${}_{38}$Sr-${}_{58}$Ce, ${}_{40}$Zr-${}_{56}$Ba, ${}_{42}$Mo-${}_{54}$Xe, ${}_{44}$Ru-${}_{52}$Te, and ${}_{46}$Pd-${}_{50}$Sn were observed to be associated with $\ensuremath{\alpha}$ ternary fission of ${}^{252}$Cf. Yields of cold $\ensuremath{\alpha}$ ternary fission were extracted.

10.1103/physrevc.57.2370

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Citations (66)

Interplay between octupole and quasiparticle excitations in178Hgand180Hg

Physical Review C (2000)

F. G. Kondev R. V. F. Janssens M. P. Carpenter K. Abu Saleem I. Ahmad

Excited structures in the Z=80,178Hg(N=98), and 180Hg(N=100) isotopes have been investigated with the Gammasphere spectrometer in conjunction with the recoil-decay tagging technique. The present data extend the previously known ground-state bands to higher spin and excitation energy. Negative parity bands with a complex decay towards the low spin states arising from both the prolate-deformed and the nearly spherical coexisting minima have been observed for the first time in both nuclei. It is shown that these sequences have characteristics in common with negative-parity bands in the heavier even-even Hg isotopes as well as in the Os and Pt isotones. These structures are interpreted as being associated at low spin with an octupole vibration which is crossed at moderate frequency by a shape driving, two-quasiproton excitation.Received 27 April 2000DOI:https://doi.org/10.1103/PhysRevC.62.044305©2000 American Physical Society

10.1103/physrevc.62.044305

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Citations (37)

Rotational bands in ^101-103Nb and ^98,100Y

APS Division of Nuclear Physics Meeting Abstracts (1998)

J. K. Hwang A. V. Ramayya J. H. Hamilton L.K. Peker J. Kormicki

Source

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In-beam spectroscopy study of doubly-odd nucleus ^182Au

APS Division of Nuclear Physics Meeting Abstracts (1999)

J. P. Zhang W. C.R. B. Piercey J. A. Winger W. Liu

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Identification of new negative-parity levels in152,154Nd

Physical Review C (1998)

X. Q. Zhang J. H. Hamilton A. V. Ramayya L.K. Peker J. K. Hwang

From an experiment with Gammasphere and a 252Cf spontaneous fission source, a new negative-parity band in 154Nd and new negative-parity levels in 152Nd were identified and the yrast bands were extended to 18+ in 154Nd and 20+ in 152Nd in a triple gamma coincidence study. These new negative-parity bands are consistent with octupole vibrational mode. There is a constant difference as a function of spin between the J1 values for the negative-parity band in 152Nd and J1 for the similar negative-parity band in 154Nd, however, their J2 values are essentially identical. These bands indicate a new kind of identical band.Received 20 October 1997DOI:https://doi.org/10.1103/PhysRevC.57.2040©1998 American Physical Society

Parity (physics)

10.1103/physrevc.57.2040

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Citations (19)

First observation of excited structures in neutron-deficient 179Hg: evidence for multiple shape coexistence

Physics Letters B (2002)

F. G. Kondev M. P. Carpenter R. V. F. Janssens C. J. Lister K. Abu Saleem

Excited structures in the neutron-deficient nucleus 179Hg have been established for the first time using the Gammasphere spectrometer in conjunction with the fragment mass analyzer. Competing states originating from three different minima associated with nearly spherical, oblate, and prolate deformations were found. This result can be contrasted with the situation in heavier odd-mass Hg isotopes where only two minima (oblate and prolate) have been seen. The implications of these three shapes at low spin and excitation energy are discussed in the general context of shape coexistence in this mass region.

10.1016/s0370-2693(02)01221-2

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Citations (32)