Zeptosecond contact times for element Z=120 synthesis

被引：32

作者：

Albers, H. M. ^{[1
]}

Khuyagbaatar, J. ^{[1
,2
]}

Hinde, D. J. ^{[3
]}

Carter, I. P. ^{[3
]}

Cook, K. J. ^{[3
,8
]}

Dasgupta, M. ^{[3
]}

Duellmann, Ch E. ^{[1
,2
,4
]}

Eberhardt, K. ^{[2
,4
]}

Jeung, D. Y. ^{[3
]}

Kalkal, S. ^{[3
,9
]}

Kindler, B. ^{[1
]}

Lobanov, N. R. ^{[3
]}

Lommel, B. ^{[1
]}

Mokry, C. ^{[2
,4
]}

Prasad, E. ^{[3
,10
]}

Rafferty, D. C. ^{[3
]}

Runke, J. ^{[1
]}

Sekizawa, K. ^{[5
,6
]}

Sengupta, C. ^{[3
]}

Simenel, C. ^{[3
,7
]}

Simpson, E. C. ^{[3
]}

Smith, J. F. ^{[3
,11
]}

Thoerle-Pospiech, P. ^{[2
,4
]}

Trautmann, N. ^{[4
]}

Vo-Phuoc, K. ^{[3
]}

Walshe, J. ^{[3
]}

Williams, E. ^{[3
]}

Yakushev, A. ^{[1
]}

机构：

[1] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany

[2] Helmholtz Inst Mainz, D-55099 Mainz, Germany

[3] Australian Natl Univ, Res Sch Phys, Dept Nucl Phys, Canberra, ACT 2601, Australia

[4] Johannes Gutenberg Univ Mainz, D-55099 Mainz, Germany

[5] Niigata Univ, Ctr Transdisciplinary Res, Inst Res Promot, Niigata 9502181, Japan

[6] Univ Tsukuba, Ctr Computat Sci, Div Nucl Phys, Tsukuba, Ibaraki 3058577, Japan

[7] Australian Natl Univ, Res Sch Phys, Dept Theoret Phys, Canberra, ACT 2601, Australia

[8] Michigan State Univ, Facil Rare Isotope Beams, E Lansing, MI 48824 USA

[9] Thapar Univ, Sch Phys & Mat Sci, Patiala 147004, Punjab, India

[10] Cent Univ Kerala, Sch Math & Phys Sci, Dept Phys, Kasaragod 671314, India

[11] Univ Surrey, Adv Technol Inst, Guildford GU2 7XH, Surrey, England

来源：

PHYSICS LETTERS B | 2020年 / 808卷

基金：

澳大利亚研究理事会;

关键词：

Superheavy-element formation; Z=120; Quasifission; QUASI-FISSION; FUSION-FISSION; ACTINIDE TARGETS; HEAVY; NUCLEI; MASSES; DEPENDENCE;

D O I：

10.1016/j.physletb.2020.135626

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The synthesis of new superheavy elements beyond oganesson (Z=118) requires fusion reactions with projectile nuclei with proton numbers larger than that of Ca-48 (Z=20), which has been successfully employed for the synthesis of elements with Z=112-118. In such reactions, fusion is drastically hindered by fast non-equilibrated dynamical processes. Attempts to produce nuclei with Z=120 using the Ni-64+U-238, Fe-58+Pu-244, Cr-54+Cm-248, and Ti-50+Cf-249 reactions have been made, which all result in larger Coulomb forces than for Ca-48-induced reactions, but no discovery has been confirmed to date. In this work, mass and angle distributions of fission fragments from these reactions have been measured with large angular coverage to aid in selection of the most promising projectile-target combination that would favorfusion. The results yield information on reaction contact times, with the longest exhibited by Ti-50+Cf-249. (C) 2020 The Authors. Published by Elsevier B.V.

引用

页数：6

共 69 条

[1] Shell structure of superheavy nuclei in self-consistent mean-field models [J].

Bender, M ;

Rutz, K ;

Reinhard, PG ;

Maruhn, JA ;

Greiner, W .

PHYSICAL REVIEW C, 1999, 60 (03) :20

[2] DYNAMICS OF THE FUSION PROCESS [J].

BOCK, R ;

CHU, YT ;

DAKOWSKI, M ;

GOBBI, A ;

GROSSE, E ;

OLMI, A ;

SANN, H ;

SCHWALM, D ;

LYNEN, U ;

MULLER, W ;

BJORNHOLM, S ;

ESBENSEN, H ;

WOLFLI, W ;

MORENZONI, E .

NUCLEAR PHYSICS A, 1982, 388 (02) :334-380

[3]

Cwiok S, 1996, NUCL PHYS A, V611, P211, DOI 10.1016/S0375-9474(96)00337-5

[4] Mapping quasifission characteristics and timescales in heavy element formation reactions [J].

du Rietz, R. ;

Williams, E. ;

Hinde, D. J. ;

Dasgupta, M. ;

Evers, M. ;

Lin, C. J. ;

Luong, D. H. ;

Simenel, C. ;

Wakhle, A. .

PHYSICAL REVIEW C, 2013, 88 (05)

[5] Predominant Time Scales in Fission Processes in Reactions of S, Ti and Ni with W: Zeptosecond versus Attosecond [J].

du Rietz, R. ;

Hinde, D. J. ;

Dasgupta, M. ;

Thomas, R. G. ;

Gasques, L. R. ;

Evers, M. ;

Lobanov, N. ;

Wakhle, A. .

PHYSICAL REVIEW LETTERS, 2011, 106 (05)

[6] Production and Decay of Element 114: High Cross Sections and the New Nucleus 277Hs [J].

Duellmann, Ch. E. ;

Schaedel, M. ;

Yakushev, A. ;

Tuerler, A. ;

Eberhardt, K. ;

Kratz, J. V. ;

Ackermann, D. ;

Andersson, L. -L. ;

Block, M. ;

Bruechle, W. ;

Dvorak, J. ;

Essel, H. G. ;

Ellison, P. A. ;

Even, J. ;

Gates, J. M. ;

Gorshkov, A. ;

Graeger, R. ;

Gregorich, K. E. ;

Hartmann, W. ;

Herzberg, R. -D. ;

Hessberger, F. P. ;

Hild, D. ;

Huebner, A. ;

Jaeger, E. ;

Khuyagbaatar, J. ;

Kindler, B. ;

Krier, J. ;

Kurz, N. ;

Lahiri, S. ;

Liebe, D. ;

Lommel, B. ;

Maiti, M. ;

Nitsche, H. ;

Omtvedt, J. P. ;

Parr, E. ;

Rudolph, D. ;

Runke, J. ;

Schausten, B. ;

Schimpf, E. ;

Semchenkov, A. ;

Steiner, J. ;

Thoerle-Pospiech, P. ;

Uusitalo, J. ;

Wegrzecki, M. ;

Wiehl, N. .

PHYSICAL REVIEW LETTERS, 2010, 104 (25)

[7] Indication for a volatile element 114 [J].

Eichler, R. ;

Aksenov, N. V. ;

Albin, Yu. V. ;

Belozerov, A. V. ;

Bozhikov, G. A. ;

Chepigin, V. I. ;

Dmitriev, S. N. ;

Dressler, R. ;

Gaeggeler, H. W. ;

Gorshkov, V. A. ;

Henderson, R. A. ;

Johnsen, A. M. ;

Kenneally, J. M. ;

Lebedev, V. Ya ;

Malyshev, O. N. ;

Moody, K. J. ;

Oganessian, Yu. Ts ;

Petrushkin, O. V. ;

Piguet, D. ;

Popeko, A. G. ;

Rasmussen, P. ;

Serov, A. ;

Shaughnessy, D. A. ;

Shishkin, S. V. ;

Shutov, A. V. ;

Stoyer, M. A. ;

Stoyer, N. J. ;

Svirikhin, A. I. ;

Tereshatov, E. E. ;

Vostokin, G. K. ;

Wegrzecki, M. ;

Wilk, P. A. ;

Wittwer, D. ;

Yeremin, A. V. .

RADIOCHIMICA ACTA, 2010, 98 (03) :133-139

[8] New Superheavy Element Isotopes: 242Pu(48Ca, 5n)285114 [J].

Ellison, P. A. ;

Gregorich, K. E. ;

Berryman, J. S. ;

Bleuel, D. L. ;

Clark, R. M. ;

Dragojevic, I. ;

Dvorak, J. ;

Fallon, P. ;

Fineman-Sotomayor, C. ;

Gates, J. M. ;

Gothe, O. R. ;

Lee, I. Y. ;

Loveland, W. D. ;

McLaughlin, J. P. ;

Paschalis, S. ;

Petri, M. ;

Qian, J. ;

Stavsetra, L. ;

Wiedeking, M. ;

Nitsche, H. .

PHYSICAL REVIEW LETTERS, 2010, 105 (18)

[9] First superheavy element experiments at the GSI recoil separator TASCA: The production and decay of element 114 in the 244Pu(48Ca,3-4n) reaction [J].

Gates, J. M. ;

Duellmann, Ch E. ;

Schaedel, M. ;

Yakushev, A. ;

Tuerler, A. ;

Eberhardt, K. ;

Kratz, J. V. ;

Ackermann, D. ;

Andersson, L. -L. ;

Block, M. ;

Bruechle, W. ;

Dvorak, J. ;

Essel, H. G. ;

Ellison, P. A. ;

Even, J. ;

Forsberg, U. ;

Gellanki, J. ;

Gorshkov, A. ;

Graeger, R. ;

Gregorich, K. E. ;

Hartmann, W. ;

Herzberg, R. -D. ;

Hessberger, F. P. ;

Hild, D. ;

Huebner, A. ;

Jaeger, E. ;

Khuyagbaatar, J. ;

Kindler, B. ;

Krier, J. ;

Kurz, N. ;

Lahiri, S. ;

Liebe, D. ;

Lommel, B. ;

Maiti, M. ;

Nitsche, H. ;

Omtvedt, J. P. ;

Parr, E. ;

Rudolph, D. ;

Runke, J. ;

Schaffner, H. ;

Schausten, B. ;

Schimpf, E. ;

Semchenkov, A. ;

Steiner, J. ;

Thoerle-Pospiech, P. ;

Uusitalo, J. ;

Wegrzecki, M. ;

Wiehl, N. .

PHYSICAL REVIEW C, 2011, 83 (05)

[10] A program for coupled-channel calculations with all order couplings for heavy-ion fusion reactions [J].

Hagino, K ;

Rowley, N ;

Kruppa, AT .

COMPUTER PHYSICS COMMUNICATIONS, 1999, 123 (1-3) :143-152

← 1 2 3 4 5 6 7 →