Dominance of direct reaction channels at deep sub-barrier energies for weakly bound nuclei on heavy targets: The case 8B + 208Pb

被引：31

作者：

Pakou, A. ^{[1
,2
]}

Acosta, L. ^{[3
]}

O'Malley, P. D. ^{[4
]}

Aguilar, S. ^{[5
]}

Aguilera, E. F. ^{[4
]}

Baines, M. ^{[4
]}

Bardayan, D. ^{[6
]}

Becchetti, F. D. ^{[6
]}

Boomershine, Ch ^{[4
]}

Brodeur, M. ^{[4
]}

Cappuzzello, F. ^{[7
,8
]}

Carmichael, S. ^{[4
]}

Caves, L. ^{[4
]}

Chavez, E. ^{[3
]}

Flores-Vazquez, C. ^{[3
]}

Gula, A. ^{[4
]}

Kolata, J. J. ^{[4
]}

Liu, B. ^{[4
]}

Marin-Lambarri, D. J. ^{[3
]}

Morales, F. F. ^{[3
]}

Rusek, K. ^{[9
]}

Sanchez-Benitez, A. M. ^{[10
]}

Sgouros, O. ^{[7
]}

Sharma, V. R. ^{[5
]}

Soukeras, V ^{[7
]}

Souliotis, G. ^{[11
,12
]}

机构：

[1] Univ Ioannina, Dept Phys, Ioannina 45110, Greece

[2] Univ Ioannina, HINP, Ioannina 45110, Greece

[3] Univ Nacl Autonoma Mexico, Inst Fis, Apartado 20-364, Mexico City 01000, DF, Mexico

[4] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

[5] Inst Nacl Invest Nucl, Dept Aceleradores, Apartado Postal 18-1027, Mexico City 11801, DF, Mexico

[6] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[7] Ist Nazl Fis Nucl, Lab Nazl Sud, Via S Sofia 62, I-95125 Catania, Italy

[8] Univ Catania, Dipartimento Fis & Astron, Via S Sofia 64, I-95125 Catania, Italy

[9] Univ Warsaw, Heavy Ion Lab, Ulica Pasteura 5a, PL-02093 Warsaw, Poland

[10] Univ Huelva, Ctr Estudios Avanzados Fis Matemat & Comp CEAFMC, Dept Integrated Sci, Huelva 21071, Spain

[11] Natl & Kapodistrian Univ Athens, Dept Chem, Athens 15771, Greece

[12] HINP, Athens 15771, Greece

来源：

PHYSICAL REVIEW C | 2020年 / 102卷 / 03期

基金：

美国国家科学基金会;

关键词：

SUB-BARRIER FUSION; BREAKUP; ENHANCEMENT; HALO;

D O I：

10.1103/PhysRevC.102.031601

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We report the first evidence of breakup dominance at deep sub-barrier energies for the proton halo nucleus B-8 on a heavy target. Angular distribution measurements of the B-8 breakup fragment, Be-7, on lead were performed at the TwinSol facility of the University of Notre Dame at a beam energy of 30 MeV, 58% of the Coulomb barrier and corresponding to a distance of closest approach of 20.5 fm. The Be-7 yield was observed in two double sided silicon strip detector telescopes symmetrical to the radioactive beam and normalized using the B-8 Rutherford scattering. The results are in excellent agreement with continuum discretized coupled channel calculations with a total breakup cross section (326 +/- 84) mb. This is found to exhaust all of the total reaction cross section for the system B-8 + (208)pb, possibly prohibiting a fusion enhancement. This finding is expected to give more insight to the puzzle of fusion suppression at deep sub-barrier energies with possible major consequences on nuclear astrophysics.

引用

页数：5

共 6 条

[1] Direct processes for the systems 7Be,8B +208Pb at Coulomb barrier energies
Mazzocco, M.
Keeley, N.
Boiano, A.
Boiano, C.
La Commara, M.
Lagni, A.
Manea, C.
Parascandolo, C.
Pierroutsakou, D.
Signorini, C.
Strano, E.
Torresi, D.
Yamaguchi, H.
Kahl, D.
Acosta, L.
Di Meo
Fernandez-Garcia, J. P.
Glodariu, T.
Grebosz, J.
Guglielmetti, A.
Hirayama, Y.
Imai, N.
Ishiyama, H.
Iwasa, N.
Jeong, S. C.
Jia, H. M.
Kim, Y. H.
Kimura, S.
Kubono, S.
La Rana, G.
Lin, C. J.
Lotti, P.
Marquinez-Duran, G.
Martel, I
Miyatake, H.
Mukai, M.
Nakao, T.
Nicoletto, M.
Pakou, A.
Rusek, K.
Sakaguchi, Y.
Sanchez-Benitez, A. M.
Sava, T.
Sgouros, O.
Soukeras, V
Soramel, F.
Stiliaris, E.
Stroe, L.
Teranishi, T.
Toniolo, N.
27TH INTERNATIONAL NUCLEAR PHYSICS CONFERENCE (INPC2019), 2020, 1643
[2] Reaction Dynamics for the Systems 7Be,8B + 208Pb at Coulomb Barrier Energies
Mazzocco, M.
Boiano, A.
Boiano, C.
La Commara, M.
Manea, C.
Parascandolo, C.
Pierroutsakou, D.
Signorini, C.
Strano, E.
Torresi, D.
Yamaguchi, H.
Kahl, D.
Acosta, L.
Di Meo, P.
Fernandez-Garcia, J. P.
Glodariu, T.
Grebosz, J.
Guglielmetti, A.
Imai, N.
Hirayama, Y.
Ishiyama, H.
Iwasa, N.
Jeong, S. C.
Jia, H. M.
Keeley, N.
Kim, Y. H.
Kimura, S.
Kubono, S.
Lay, J. A.
Lin, C. J.
Marquinez-Duran, G.
Martel, I.
Miyatake, H.
Mukai, M.
Nakao, T.
Nicoletto, M.
Pakou, A.
Rusek, K.
Sakaguchi, Y.
Sanchez-Benitez, A. M.
Sava, T.
Sgouros, O.
Soramel, F.
Soukeras, V.
Stiliaris, E.
Stroe, L.
Teranishi, T.
Toniolo, N.
Wakabayashi, Y.
Watanabe, Y. X.
XLI SYMPOSIUM ON NUCLEAR PHYSICS 2018 (COCOYOC2018), 2018, 1078
[3] Deep sub-barrier breakup dynamics in the 8B+208Pb reaction
Mukeru, B.
Ndala, L. V.
Lekala, M. L.
PRAMANA-JOURNAL OF PHYSICS, 2021, 95 (03):
[4] Effect on incomplete fusion of breakup fragments of the weakly bound projectile 8B in reactions with targets 27Al, 28Si, 208Pb and 209Bi
Camacho, A. Gomez
XLV SYMPOSIUM ON NUCLEAR PHYSICS 2024, 2024, 301
[5] 6Li breakup from 208Pb target at Coulomb barrier energies:: doorway to reaction mechanism induced by loosely bound/halo nuclei
Mazzocco, M
Scopel, P
Signorini, C
Fortunato, L
Soramel, F
Thompson, IJ
Vitturi, A
Barbui, M
Brondi, A
Cinausero, M
Fabris, D
Fioretto, E
La Rana, G
Lunardon, M
Moro, R
Ordine, A
Prete, GF
Rizzi, V
Stroe, L
Trotta, M
Vardaci, E
Viesti, G
NUCLEAR PHYSICS A, 2004, 746 : 497C - 500C
[6] Deep sub-barrier breakup dynamics in the 8B+208Pb\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^8{\mathrm{B}}+{}^{208}{\mathrm{Pb}}$$\end{document} reaction
B Mukeru
L V Ndala
M L Lekala
Pramana, 2021, 95 (3)

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