Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114)

K. Banerjee; D. J. Hinde; M. Dasgupta; J. Sadhukhan; E. C. Simpson; D. Y. Jeung; C. Simenel; B. M.A. Swinton-Bland; E. Williams; L. T. Bezzina; I. P. Carter; K. J. Cook; H. M. Albers; Ch E. Düllmann; J. Khuyagbaatar; B. Kindler; B. Lommel; C. Mokry; E. Prasad; J. Runke; N. Schunck; C. Sengupta; J. F. Smith; P. Thörle-Pospiech; N. Trautmann; K. Vo-Phuoc; J. Walshe; A. Yakushev

doi:10.1016/j.physletb.2021.136601

Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114)

K. Banerjee^*, D. J. Hinde, M. Dasgupta, J. Sadhukhan, E. C. Simpson, D. Y. Jeung, C. Simenel, B. M.A. Swinton-Bland, E. Williams, L. T. Bezzina, I. P. Carter, K. J. Cook, H. M. Albers, Ch E. Düllmann, J. Khuyagbaatar, B. Kindler, B. Lommel, C. Mokry, E. Prasad, J. RunkeN. Schunck, C. Sengupta, J. F. Smith, P. Thörle-Pospiech, N. Trautmann, K. Vo-Phuoc, J. Walshe, A. Yakushev

^*Corresponding author for this work

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Abstract

Measurements of mass and angular distributions have been made for fission-like outcomes in reactions forming isotopes of flerovium (Z=114), using ⁴⁸Ca, ⁵⁰Ti, and ⁵⁴Cr projectiles. The dominant fast quasifission process, which masks the presence of fusion-fission, has minimum yield at the most backward angles, where the sensitivity to fusion-fission is thus highest. In fitting the backward angle mass spectra, only weak evidence for a component of super-asymmetric fission was found, but a near-symmetric fission component was consistently required for the ⁴⁸Ca + ²⁴⁴Pu reaction, giving upper limit to the fusion probabilities P_CN of ∼10⁻², ∼5 times lower than previous results. P_CN for the ⁵⁰Ti reaction was lower than ⁴⁸Ca, whilst no evidence of fusion-fission was found for the ⁵⁴Cr reaction.

Original language	English
Article number	136601
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	820
DOIs	https://doi.org/10.1016/j.physletb.2021.136601
Publication status	Published - 10 Sept 2021

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Banerjee, K., Hinde, D. J., Dasgupta, M., Sadhukhan, J., Simpson, E. C., Jeung, D. Y., Simenel, C., Swinton-Bland, B. M. A., Williams, E., Bezzina, L. T., Carter, I. P., Cook, K. J., Albers, H. M., Düllmann, C. E., Khuyagbaatar, J., Kindler, B., Lommel, B., Mokry, C., Prasad, E., ... Yakushev, A. (2021). Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114). Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 820, Article 136601. https://doi.org/10.1016/j.physletb.2021.136601

@article{cb1191731cf14c37b47ad6e61e7cc4c5,

title = "Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114)",

abstract = "Measurements of mass and angular distributions have been made for fission-like outcomes in reactions forming isotopes of flerovium (Z=114), using 48Ca, 50Ti, and 54Cr projectiles. The dominant fast quasifission process, which masks the presence of fusion-fission, has minimum yield at the most backward angles, where the sensitivity to fusion-fission is thus highest. In fitting the backward angle mass spectra, only weak evidence for a component of super-asymmetric fission was found, but a near-symmetric fission component was consistently required for the 48Ca + 244Pu reaction, giving upper limit to the fusion probabilities PCN of ∼10−2, ∼5 times lower than previous results. PCN for the 50Ti reaction was lower than 48Ca, whilst no evidence of fusion-fission was found for the 54Cr reaction.",

keywords = "Microscopic model calculations, Nuclear fission dynamics, Superheavy element",

author = "K. Banerjee and Hinde, {D. J.} and M. Dasgupta and J. Sadhukhan and Simpson, {E. C.} and Jeung, {D. Y.} and C. Simenel and Swinton-Bland, {B. M.A.} and E. Williams and Bezzina, {L. T.} and Carter, {I. P.} and Cook, {K. J.} and Albers, {H. M.} and D{\"u}llmann, {Ch E.} and J. Khuyagbaatar and B. Kindler and B. Lommel and C. Mokry and E. Prasad and J. Runke and N. Schunck and C. Sengupta and Smith, {J. F.} and P. Th{\"o}rle-Pospiech and N. Trautmann and K. Vo-Phuoc and J. Walshe and A. Yakushev",

note = "Publisher Copyright: {\textcopyright} 2021 The Authors",

year = "2021",

month = sep,

day = "10",

doi = "10.1016/j.physletb.2021.136601",

language = "English",

volume = "820",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

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Banerjee, K, Hinde, DJ , Dasgupta, M, Sadhukhan, J, Simpson, EC, Jeung, DY, Simenel, C, Swinton-Bland, BMA, Williams, E, Bezzina, LT, Carter, IP, Cook, KJ, Albers, HM, Düllmann, CE, Khuyagbaatar, J, Kindler, B, Lommel, B, Mokry, C, Prasad, E, Runke, J, Schunck, N, Sengupta, C, Smith, JF, Thörle-Pospiech, P, Trautmann, N, Vo-Phuoc, K, Walshe, J & Yakushev, A 2021, 'Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114)', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 820, 136601. https://doi.org/10.1016/j.physletb.2021.136601

TY - JOUR

T1 - Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114)

AU - Banerjee, K.

AU - Hinde, D. J.

AU - Dasgupta, M.

AU - Sadhukhan, J.

AU - Simpson, E. C.

AU - Jeung, D. Y.

AU - Simenel, C.

AU - Swinton-Bland, B. M.A.

AU - Williams, E.

AU - Bezzina, L. T.

AU - Carter, I. P.

AU - Cook, K. J.

AU - Albers, H. M.

AU - Düllmann, Ch E.

AU - Khuyagbaatar, J.

AU - Kindler, B.

AU - Lommel, B.

AU - Mokry, C.

AU - Prasad, E.

AU - Runke, J.

AU - Schunck, N.

AU - Sengupta, C.

AU - Smith, J. F.

AU - Thörle-Pospiech, P.

AU - Trautmann, N.

AU - Vo-Phuoc, K.

AU - Walshe, J.

AU - Yakushev, A.

PY - 2021/9/10

Y1 - 2021/9/10

N2 - Measurements of mass and angular distributions have been made for fission-like outcomes in reactions forming isotopes of flerovium (Z=114), using 48Ca, 50Ti, and 54Cr projectiles. The dominant fast quasifission process, which masks the presence of fusion-fission, has minimum yield at the most backward angles, where the sensitivity to fusion-fission is thus highest. In fitting the backward angle mass spectra, only weak evidence for a component of super-asymmetric fission was found, but a near-symmetric fission component was consistently required for the 48Ca + 244Pu reaction, giving upper limit to the fusion probabilities PCN of ∼10−2, ∼5 times lower than previous results. PCN for the 50Ti reaction was lower than 48Ca, whilst no evidence of fusion-fission was found for the 54Cr reaction.

AB - Measurements of mass and angular distributions have been made for fission-like outcomes in reactions forming isotopes of flerovium (Z=114), using 48Ca, 50Ti, and 54Cr projectiles. The dominant fast quasifission process, which masks the presence of fusion-fission, has minimum yield at the most backward angles, where the sensitivity to fusion-fission is thus highest. In fitting the backward angle mass spectra, only weak evidence for a component of super-asymmetric fission was found, but a near-symmetric fission component was consistently required for the 48Ca + 244Pu reaction, giving upper limit to the fusion probabilities PCN of ∼10−2, ∼5 times lower than previous results. PCN for the 50Ti reaction was lower than 48Ca, whilst no evidence of fusion-fission was found for the 54Cr reaction.

KW - Microscopic model calculations

KW - Nuclear fission dynamics

KW - Superheavy element

UR - http://www.scopus.com/inward/record.url?scp=85113965438&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2021.136601

DO - 10.1016/j.physletb.2021.136601

M3 - Article

SN - 0370-2693

VL - 820

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 136601

ER -

Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114)

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