Electron screening in 7 Li (p,α)α and 6 Li (p,α)3 He for different environments

The electron screening in the 7 Li (p,α)α reaction has been studied at Ep=30 to 100 keV for different environments: Li 2 WO 4 insulator, Li metal, and PdLi alloys. For the insulator a screening potential energy of Ue=185±150 eV was observed, consistent with previous work and the atomic adiabatic limit. However, for the Li metal and the PdLi alloys we find large values of Ue=1280±60 and 3790±330 eV , respectively: the values can be explained by the plasma model of Debye applied to the quasi-free metallic electrons in these samples. Similar results have been found for the 6 Li (p,α)3 He reaction supporting the hypothesis of the isotopic independence of the electron screening effect. The data together with previous studies of d(d,p)t and 9 Be (p,α)6 Li in metals verify the Debye model scaling Ue∝Zt (charge number of target).

References(14)

Figures(0)

[1]

H.J. Assenbaum
,
K. Langanke
,
C. Rolfs

- Z.Phys.A 327 (1987) 461

[2]

Cauldrons in the Cosmos

C. Rolfs
,
W.S. Rodney

[3]

Enhanced electron screening in d (d, p)t for deuterated Ta*

et al.

- Eur.Phys.J.A 13 (2002) 3, 377-382
•
DOI:
- 10.1007/s10050-002-8766-5

[4]

F. Raiola

- Eur.Phys.J.A 19 (2004) 283

[5]

F. Raiola

- Eur.Phys.J.A 31 (2005) 1

[6]

U. Greife

- Z.Phys.A 351 (1995) 107

[7]

The Hall Effect in Metals and Alloys

C.M. Hurd

[8]

S. Engstler

- Z.Phys.A 342 (1992) 471

[9]

J. Kasagi

- J.Phys.Soc.Jap. 71 (2002) 2881

[9]

J. Kasagi

- J.Phys.Soc.Jap. 73 (2004) 608

[10]

Thesis, New University of Lisboa

J. Cruz

[11]

M. Lattuada

- Astron.J. 562 (2001) 1076

[12]

Validity test of the [trojan horse] method applied to the Li-6 (p, alpha) He-3 reaction

et al.

- Phys.Rev.C 67 (2003) 065803
•
DOI:
- 10.1103/PhysRevC.67.065803

[13]

D. Zahnow

- Z.Phys.A 359 (1997) 211