Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf252

doi:10.1103/PhysRevC.101.034610

This content will become publicly available on March 17, 2021

Title: Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of ${}^{252}{Cf}$

Abstract

We reinvestigated the neutron multiplicity yields of Ba-Mo, Ce-Zr, Te-Pd, and Nd-Sr from the spontaneous fission of ²⁵²Cf by (i) using both γ -γ -γ -γ and γ -γ -γ coincidence data, (ii) using up to date level scheme structures, and (iii) crosschecking analogous energy transitions in multiple isotopes, we have achieved higher precision than previous analyses. Particular attention was given to the Ba-Mo pairs where our results clearly confirm that the Ba-Mo yield data have a second hot fission mode where 8–10, and now 11 neutron evaporation channels are observed. These are the first observations of the 11 neutron channel. These 8–11 neutron channels are observed for the first time in the Ce-Zr pairs, but are not observed in other fission pairs. The measured intensities of the second mode in Ba-Mo and Ce-Zr pairs are ~1.5(4)% and ~1.0(3)%, respectively. These high neutron number evaporation modes can be an indication of hyperdeformation and/or octupole deformation in ^143-145Ba and in ^146,148Ce at scission to give rise to such high neutron multiplicities.

Authors:

^[1]; Thibeault, A. H. ^[1]; Richards, T. H. ^[2];

^[1];

^[1]; Ramayya, A. V. ^[1]; Luo, Y. X. ^[3]; Rasmussen, J. O. ^[4];

^[5]; Oganessian, Yu. Ts. ^[5]; Zhu, S. J. ^[6]

Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy
Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy; Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)
Tsinghua Univ., Beijing (China). Dept. of Physics

Publication Date:: 2020-03-17

Research Org.:: Vanderbilt Univ., Nashville, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

OSTI Identifier:: 1605559

Alternate Identifier(s):: OSTI ID: 1605316

Grant/Contract Number:: [FG05-88ER40407; AC03-76SF00098]

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: [ Journal Volume: 101; 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; 252-Cf; fission; yields matrix; extra hot fission mode; octupole; hyperderformation

Citation Formats


                    Musangu, B. M., Thibeault, A. H., Richards, T. H., Wang, E. H., Hamilton, J. H., Zachary, C. J., Eldridge, J. M., Ramayya, A. V., Luo, Y. X., Rasmussen, J. O., Ter-Akopian, G. M., Oganessian, Yu. Ts., and Zhu, S. J. Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf252.  United States: N. p., 2020. 
        Web.  doi:10.1103/PhysRevC.101.034610.

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                    Musangu, B. M., Thibeault, A. H., Richards, T. H., Wang, E. H., Hamilton, J. H., Zachary, C. J., Eldridge, J. M., Ramayya, A. V., Luo, Y. X., Rasmussen, J. O., Ter-Akopian, G. M., Oganessian, Yu. Ts., & Zhu, S. J. Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf252.  United States.  doi:10.1103/PhysRevC.101.034610.

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                    Musangu, B. M., Thibeault, A. H., Richards, T. H., Wang, E. H., Hamilton, J. H., Zachary, C. J., Eldridge, J. M., Ramayya, A. V., Luo, Y. X., Rasmussen, J. O., Ter-Akopian, G. M., Oganessian, Yu. Ts., and Zhu, S. J. Tue .  
        "Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf252".  United States.  doi:10.1103/PhysRevC.101.034610.

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@article{osti_1605559,

  title        = {Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf252},

  author       = {Musangu, B. M. and Thibeault, A. H. and Richards, T. H. and Wang, E. H. and Hamilton, J. H. and Zachary, C. J. and Eldridge, J. M. and Ramayya, A. V. and Luo, Y. X. and Rasmussen, J. O. and Ter-Akopian, G. M. and Oganessian, Yu. Ts. and Zhu, S. J.},

  abstractNote = {We reinvestigated the neutron multiplicity yields of Ba-Mo, Ce-Zr, Te-Pd, and Nd-Sr from the spontaneous fission of 252Cf by (i) using both γ -γ -γ -γ and γ -γ -γ coincidence data, (ii) using up to date level scheme structures, and (iii) crosschecking analogous energy transitions in multiple isotopes, we have achieved higher precision than previous analyses. Particular attention was given to the Ba-Mo pairs where our results clearly confirm that the Ba-Mo yield data have a second hot fission mode where 8–10, and now 11 neutron evaporation channels are observed. These are the first observations of the 11 neutron channel. These 8–11 neutron channels are observed for the first time in the Ce-Zr pairs, but are not observed in other fission pairs. The measured intensities of the second mode in Ba-Mo and Ce-Zr pairs are ~1.5(4)% and ~1.0(3)%, respectively. These high neutron number evaporation modes can be an indication of hyperdeformation and/or octupole deformation in 143-145Ba and in 146,148Ce at scission to give rise to such high neutron multiplicities.},

  doi          = {10.1103/PhysRevC.101.034610},

  journal      = {Physical Review C},

  number       = [3],

  volume       = [101],

  place        = {United States},

  year         = {2020},

  month        = {3}

}

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Title: Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf 252

Abstract

Citation Formats

Yields of correlated fragment pairs in spontaneous fission of 252 Cf journal, March 1997

New Spontaneous Fission Mode for 252 Cf : Indication of Hyperdeformed 1 4 4 , 1 4 5 , 1 4 6 Ba at Scission journal, July 1996

Neutron Multiplicities and Yields of Correlated Zr-Ce and Mo-Ba Fragment Paris in Spontaneous Fission of Cf 252 journal, September 1994

Manifestation of clustering in the 252Cf(sf) and 249Cf(nth,f) reactions journal, October 1997

Cluster Aspects of 252 Cf Spontaneous Fission journal, December 1998

Nuclear scission journal, December 1990

Study of the Mo-Ba partition in 252Cf spontaneous fission journal, February 2000

New determination of the Ba-Mo yield matrix for 252 Cf journal, August 2000

Resolution of complex γ spectra from triple-coincidence data: Ba–Mo split in 252Cf spontaneous fission journal, March 2002

New results for the intensity of bimodal fission in barium channels of the spontaneous fission of Cf 252 journal, July 2006

Unexpected 5 / 2 − spin of the ground state in 147 Ba: No octupole deformation in ground states of odd- A Ba isotopes journal, March 2013

Near-yrast structure of N = 93 neutron-rich lanthanide nuclei journal, February 2010

One- and two-phonon γ -vibrational bands in neutron-rich Mo 107 journal, September 2017

Near-yrast structure of the Mo 109 nucleus journal, March 2006

Band structure of 149 Ce journal, July 2012

Mapping neutron levels in the A ~ 100 region: The ν 3 / 2 + [411] band in Zr 103 journal, June 2009

Near-yrast, medium-spin structure of the Mo 107 nucleus journal, August 2005

Identification of band structures and proposed one- and two-phonon γ-vibrational bands in Mo 105 journal, November 2006

New insights into the nuclear structure in neutron-rich 112,114,115,116,117,118Pd journal, December 2013

Nuclear structure and β -decay schemes for Te nuclides beyond N = 82 journal, April 2017

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

New insights from studies of spontaneous fission with large detector arrays journal, January 1995

Identification of new transitions and mass assignments of levels in Pr 143 – 153 journal, September 2015

Nuclear-charge distribution and delayed-neutron yields for thermal-neutron-induced fission of 235U, 233U, and 239Pu and for spontaneous fission of 252Cf journal, May 1988

New isomeric states in 152,154,156Nd produced by spontaneous fission of 252Cf journal, April 1998

The 11 / 2 − [ 505 ] neutron extruder orbital in Sm 159 journal, September 2009

Two-quasiparticle isomers and bands of Nd 154 , 156 and Sm 156 , 158 , 160 journal, August 2009

Search for octupole correlations in neutron-rich Ce 148 nucleus journal, May 2006

Octupole correlations in neutron-rich 1 4 3 , 1 4 5 Ba and a type of superdeformed band in 145 Ba journal, October 1999

Direct Evidence of Octupole Deformation in Neutron-Rich Ba 144 journal, March 2016

Title: Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of ${}^{252}{Cf}$

Yields of correlated fragment pairs in spontaneous fission of $^{252}$ Cf
journal, March 1997

New Spontaneous Fission Mode for $^{252} Cf$ : Indication of Hyperdeformed $^{144, 145, 146} Ba$ at Scission
journal, July 1996

Neutron Multiplicities and Yields of Correlated Zr-Ce and Mo-Ba Fragment Paris in Spontaneous Fission of ${}^{252}{Cf}$
journal, September 1994

Manifestation of clustering in the 252Cf(sf) and 249Cf(nth,f) reactions
journal, October 1997

Cluster Aspects of ²⁵² Cf Spontaneous Fission
journal, December 1998

Nuclear scission
journal, December 1990

Study of the Mo-Ba partition in 252Cf spontaneous fission
journal, February 2000

New determination of the Ba-Mo yield matrix for $^{252} Cf$
journal, August 2000

Resolution of complex γ spectra from triple-coincidence data: Ba–Mo split in 252Cf spontaneous fission
journal, March 2002

New results for the intensity of bimodal fission in barium channels of the spontaneous fission of ${}^{252}{Cf}$
journal, July 2006

Unexpected $5 / 2^{-}$ spin of the ground state in $^{147}$ Ba: No octupole deformation in ground states of odd- $A$ Ba isotopes
journal, March 2013

Near-yrast structure of $N = 93$ neutron-rich lanthanide nuclei
journal, February 2010

One- and two-phonon $γ$ -vibrational bands in neutron-rich ${}^{107}{Mo}$
journal, September 2017

Near-yrast structure of the ${}^{109}{Mo}$ nucleus
journal, March 2006

Band structure of $^{149}$ Ce
journal, July 2012

Mapping neutron levels in the $A ~ 100$ region: The $ν 3 / 2^{+}$ [411] band in ${}^{103}{Zr}$
journal, June 2009

Near-yrast, medium-spin structure of the ${}^{107}{Mo}$ nucleus
journal, August 2005

Identification of band structures and proposed one- and two-phonon γ-vibrational bands in ${}^{105}{Mo}$
journal, November 2006

New insights into the nuclear structure in neutron-rich 112,114,115,116,117,118Pd
journal, December 2013

Nuclear structure and $β$ -decay schemes for Te nuclides beyond $N = 82$
journal, April 2017

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

New insights from studies of spontaneous fission with large detector arrays
journal, January 1995

Identification of new transitions and mass assignments of levels in ${}^{143 - 153}\Pr$
journal, September 2015

Nuclear-charge distribution and delayed-neutron yields for thermal-neutron-induced fission of 235U, 233U, and 239Pu and for spontaneous fission of 252Cf
journal, May 1988

New isomeric states in 152,154,156Nd produced by spontaneous fission of 252Cf
journal, April 1998

The $11 / 2^{-} [505]$ neutron extruder orbital in ${}^{159}{Sm}$
journal, September 2009

Two-quasiparticle isomers and bands of ${}^{154, 156}{Nd}$ and ${}^{156, 158, 160}{Sm}$
journal, August 2009

Search for octupole correlations in neutron-rich ${}^{148}{Ce}$ nucleus
journal, May 2006

Octupole correlations in neutron-rich $^{143, 145} Ba$ and a type of superdeformed band in $^{145} Ba$
journal, October 1999

Direct Evidence of Octupole Deformation in Neutron-Rich ${}^{144}{Ba}$
journal, March 2016