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

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