Decay spectroscopy of two-quasiparticle K isomers in Cm246,248 via inelastic and transfer reactions

doi:10.1103/PhysRevC.100.034309

Title: Decay spectroscopy of two-quasiparticle $K$ isomers in ${}^{246, 248}{Cm}$ via inelastic and transfer reactions

Abstract

The decay of K isomers in Cm (Z = 96) isotopes has been investigated using inelastic and transfer reactions. The half-life of a previously identified 2-quasiparticle (qp) K^π = 8⁻ isomer in ²⁴⁶Cm has been measured. A new 2-qp isomer is observed in ²⁴⁸Cm, its half-life measured and its decay scheme established. The reduced K hindrances extracted for the decay transitions from the isomers in ^246,248Cm suggest K to be a robust quantum number and validate axial symmetry in these nuclei. The excitation energies of the 2-qp isomers in ²⁴⁶Cm (N = 150) and ²⁴⁸Cm (N = 152) confirm the persistence of a deformed subshell gap at N = 152 in the Z ≈ 100 region down to Z = 96 nuclei.

Authors:

^[1]; Tandel, S. K. ^[2]; Chowdhury, P. ^[3]; Khoo, T. L. ^[4];

^[4]; Carpenter, M. P. ^[4];

^[4]; Janssens, R. V. F. ^[5]; Kondev, F. G. ^[4]; Lauritsen, T. ^[4];

^[3];

^[4]; Seweryniak, D. ^[4]; Wang, X. ^[6];

^[7]

Univ. of Massachusetts, Lowell, MA (United States); Radiation Monitoring Devices, Inc., Watertown, MA (United States)
Univ. of Massachusetts, Lowell, MA (United States); UM-DAE Centre for Excellence in Basic Sciences, Mumbai (India)
Univ. of Massachusetts, Lowell, MA (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); California Polytechnic State Univ. (CalPoly), San Luis Obispo, CA (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Publication Date:: 2019-09-12

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of North Carolina, Chapel Hill, NC (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1570446

Alternate Identifier(s):: OSTI ID: 1659322; OSTI ID: 1659323

Grant/Contract Number:: AC02-06CH11357; FG02-97ER41041; FG02-97ER41033

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 100; Journal Issue: 3; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Collective levels; Electromagnetic transitions; Isomer decays; Lifetimes & widths; A ≥ 220

Citation Formats


                    Shirwadkar, U., Tandel, S. K., Chowdhury, P., Khoo, T. L., Ahmad, I., Carpenter, M. P., Greene, J. P., Janssens, R. V.  F., Kondev, F. G., Lauritsen, T., Lister, C. J., Peterson, D., Seweryniak, D., Wang, X., and Zhu, S. Decay spectroscopy of two-quasiparticle K isomers in Cm246,248 via inelastic and transfer reactions.  United States: N. p., 2019. 
        Web.  doi:10.1103/PhysRevC.100.034309.

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                    Shirwadkar, U., Tandel, S. K., Chowdhury, P., Khoo, T. L., Ahmad, I., Carpenter, M. P., Greene, J. P., Janssens, R. V.  F., Kondev, F. G., Lauritsen, T., Lister, C. J., Peterson, D., Seweryniak, D., Wang, X., & Zhu, S. Decay spectroscopy of two-quasiparticle K isomers in Cm246,248 via inelastic and transfer reactions.  United States.  doi:10.1103/PhysRevC.100.034309.

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                    Shirwadkar, U., Tandel, S. K., Chowdhury, P., Khoo, T. L., Ahmad, I., Carpenter, M. P., Greene, J. P., Janssens, R. V.  F., Kondev, F. G., Lauritsen, T., Lister, C. J., Peterson, D., Seweryniak, D., Wang, X., and Zhu, S. Thu .  
        "Decay spectroscopy of two-quasiparticle K isomers in Cm246,248 via inelastic and transfer reactions".  United States.  doi:10.1103/PhysRevC.100.034309.  https://www.osti.gov/servlets/purl/1570446.

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@article{osti_1570446,

  title        = {Decay spectroscopy of two-quasiparticle K isomers in Cm246,248 via inelastic and transfer reactions},

  author       = {Shirwadkar, U. and Tandel, S. K. and Chowdhury, P. and Khoo, T. L. and Ahmad, I. and Carpenter, M. P. and Greene, J. P. and Janssens, R. V.  F. and Kondev, F. G. and Lauritsen, T. and Lister, C. J. and Peterson, D. and Seweryniak, D. and Wang, X. and Zhu, S.},

  abstractNote = {The decay of K isomers in Cm (Z = 96) isotopes has been investigated using inelastic and transfer reactions. The half-life of a previously identified 2-quasiparticle (qp) Kπ = 8⁻ isomer in 246Cm has been measured. A new 2-qp isomer is observed in 248Cm, its half-life measured and its decay scheme established. The reduced K hindrances extracted for the decay transitions from the isomers in 246,248Cm suggest K to be a robust quantum number and validate axial symmetry in these nuclei. The excitation energies of the 2-qp isomers in 246Cm (N = 150) and 248Cm (N = 152) confirm the persistence of a deformed subshell gap at N = 152 in the Z ≈ 100 region down to Z = 96 nuclei.},

  doi          = {10.1103/PhysRevC.100.034309},

  journal      = {Physical Review C},

  number       = 3,

  volume       = 100,

  place        = {United States},

  year         = {2019},

  month        = {9}

}

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Title: Decay spectroscopy of two-quasiparticle K isomers in Cm 246 , 248 via inelastic and transfer reactions

Abstract

Citation Formats

Spectroscopy of Rf 257 journal, June 2009

Nuclear properties of 246Am and 247Am journal, July 1968

Energies of strongly deformed even nuclei in the range 228 ≦ A ≦ 254 journal, October 1964

Z dependence of the N = 152 deformed shell gap: In-beam γ-ray spectroscopy of neutron-rich Pu 245 , 246 journal, December 2007

Search for a 2-quasiparticle high- K isomer in Rf 256 journal, June 2011

Properties of the γ-vibrational state journal, March 1965

K π = 8 − isomers and K π = 2 − octupole vibrations in N = 150 shell-stabilized isotones journal, September 2008

High- K isomers in neutron-rich hafnium nuclei at and beyond the stability line journal, March 1999

Shell structure of the heaviest elements journal, June 1994

Octupole states in Cm 246 and Cm 248 populated by inelastic deuteron scattering journal, September 1975

Spectroscopy and single-particle structure of the odd- Z heavy elements 255Lr, 251Md and 247Es journal, November 2006

Single-particle energies, wave functions, quadrupole moments and g-factors in an axially deformed woods-saxon potential with applications to the two-centre-type nuclear problems journal, September 1987

Configurations and hindered decays of K isomers in deformed nuclei with A > 100 journal, May 2015

Population and decay of a K π = 8 − two-quasineutron isomer in Pu 244 journal, August 2016

High- K structure in Fm 250 and the deformed shell gaps at N = 152 and Z = 100 journal, August 2008

Decay studies of K isomers in 254No journal, December 2009

Yrast three-quasiparticle K isomers in neutron-rich 181 Hf journal, October 2001

Energy traps in atomic nuclei journal, May 1999

In-beam and decay spectroscopy of transfermium nuclei journal, October 2008

Improved Superconductivity Approximation for the Pairing Interaction in Nuclei journal, April 1964

Nuclear ground-state masses and deformations: FRDM(2012) journal, May 2016

Rotational bands in odd- A Cm and Cf isotopes: Exploring the highest neutron orbitals journal, October 2010

High-spin properties of octupole bands in 240 Pu and 248 Cm journal, March 1998

Two-quasineutron states in 98 248 Cf and 98 250 Cf and the neutron-neutron residual interactions journal, July 2008

High-K multi-quasiparticle states in 254No journal, June 2010

K-forbidden transitions from multi-quasiparticle states journal, September 1997

Cranked relativistic Hartree-Bogoliubov theory: Probing the gateway to superheavy nuclei journal, February 2003

ESCL8R and LEVIT8R: Software for interactive graphical analysis of HPGe coincidence data sets journal, July 1995

In-beam γ-ray study of the neutron-rich nuclei 240U, 246Pu, and 250Cm produced by the (18O, 16O) reaction journal, August 2007

Multi-quasiparticle states in Rf 256 journal, March 2009

New Physics Opportunities at Gammasphere journal, January 1996

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Systematics of absolute transition probabilities of K-Forbidden gamma-ray transitions journal, February 1968

The Ame2012 atomic mass evaluation journal, December 2012

The Ame2012 atomic mass evaluation journal, December 2012

Opening up the A≈180 K-isomer landscape: inelastic excitation of new multi-quasiparticle yrast traps journal, April 1998

K Isomers in No 254 : Probing Single-Particle Energies and Pairing Strengths in the Heaviest Nuclei journal, August 2006

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Review of metastable states in heavy nuclei journal, May 2016

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Title: Decay spectroscopy of two-quasiparticle $K$ isomers in ${}^{246, 248}{Cm}$ via inelastic and transfer reactions

Spectroscopy of ${}^{257}{Rf}$
journal, June 2009

Nuclear properties of 246Am and 247Am
journal, July 1968

Energies of strongly deformed even nuclei in the range 228 ≦ A ≦ 254
journal, October 1964

$Z$ dependence of the $N = 152$ deformed shell gap: In-beam γ-ray spectroscopy of neutron-rich ${}^{245, 246}{Pu}$
journal, December 2007

Search for a 2-quasiparticle high- $K$ isomer in ${}^{256}{Rf}$
journal, June 2011

Properties of the γ-vibrational state
journal, March 1965

$K^{π} = 8^{-}$ isomers and $K^{π} = 2^{-}$ octupole vibrations in $N = 150$ shell-stabilized isotones
journal, September 2008

High- $K$ isomers in neutron-rich hafnium nuclei at and beyond the stability line
journal, March 1999

Shell structure of the heaviest elements
journal, June 1994

Octupole states in ${}^{246}{Cm}$ and ${}^{248}{Cm}$ populated by inelastic deuteron scattering
journal, September 1975

Spectroscopy and single-particle structure of the odd- Z heavy elements 255Lr, 251Md and 247Es
journal, November 2006

Single-particle energies, wave functions, quadrupole moments and g-factors in an axially deformed woods-saxon potential with applications to the two-centre-type nuclear problems
journal, September 1987

Configurations and hindered decays of $K$ isomers in deformed nuclei with $A > 100$
journal, May 2015

Population and decay of a $K^{π} = 8^{-}$ two-quasineutron isomer in ${}^{244}{Pu}$
journal, August 2016

High- $K$ structure in ${}^{250}{Fm}$ and the deformed shell gaps at $N = 152$ and $Z = 100$
journal, August 2008

Decay studies of K isomers in 254No
journal, December 2009

Yrast three-quasiparticle K isomers in neutron-rich $^{181} Hf$
journal, October 2001

Energy traps in atomic nuclei
journal, May 1999

In-beam and decay spectroscopy of transfermium nuclei
journal, October 2008

Improved Superconductivity Approximation for the Pairing Interaction in Nuclei
journal, April 1964

Nuclear ground-state masses and deformations: FRDM(2012)
journal, May 2016

Rotational bands in odd- $A$ Cm and Cf isotopes: Exploring the highest neutron orbitals
journal, October 2010

High-spin properties of octupole bands in $^{240} Pu$ and $^{248} Cm$
journal, March 1998

Two-quasineutron states in $_{98}^{248} Cf$ and $_{98}^{250} Cf$ and the neutron-neutron residual interactions
journal, July 2008

High-K multi-quasiparticle states in 254No
journal, June 2010

K-forbidden transitions from multi-quasiparticle states
journal, September 1997

Cranked relativistic Hartree-Bogoliubov theory: Probing the gateway to superheavy nuclei
journal, February 2003

ESCL8R and LEVIT8R: Software for interactive graphical analysis of HPGe coincidence data sets
journal, July 1995

In-beam γ-ray study of the neutron-rich nuclei 240U, 246Pu, and 250Cm produced by the (18O, 16O) reaction
journal, August 2007

Multi-quasiparticle states in ${}^{256}{Rf}$
journal, March 2009

New Physics Opportunities at Gammasphere
journal, January 1996

Identification of a K isomer in 252No
journal, September 2007

Systematics of absolute transition probabilities of K-Forbidden gamma-ray transitions
journal, February 1968

The Ame2012 atomic mass evaluation
journal, December 2012

The Ame2012 atomic mass evaluation
journal, December 2012

Opening up the A≈180 K-isomer landscape: inelastic excitation of new multi-quasiparticle yrast traps
journal, April 1998

$K$ Isomers in ${}^{254}{No}$ : Probing Single-Particle Energies and Pairing Strengths in the Heaviest Nuclei
journal, August 2006

Problem of “deformed” superheavy nuclei
journal, February 2001

Review of metastable states in heavy nuclei
journal, May 2016

Nuclear isomers in superheavy elements as stepping stones towards the island of stability
journal, August 2006