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Cosmogenic radionuclide production in NaI(Tl) crystals | | J. Amaré
; S. Cebrián
; C. Cuesta
; E. García
; C. Ginestra
; M. Martínez
; M.A. Oliván
; Y. Ortigoza
; A. Ortiz de Solórzano
; C. Pobes
; J. Puimedón
; M.L. Sarsa
; J.A. Villar
; P. Villar
; | | Date: |
1 Nov 2014 | | Abstract: | The production of long-lived radioactive isotopes in materials due to the
exposure to cosmic rays on Earth surface can be an hazard for experiments
demanding ultra-low background conditions, typically performed deep
underground. Production rates of cosmogenic isotopes in all the materials
present in the experimental set-up, as well as the corresponding cosmic rays
exposure history, must be both well known in order to assess the relevance of
this effect in the achievable sensitivity of a given experiment. Although
NaI(Tl) scintillators are being used in experiments aiming at the direct
detection of dark matter since the first nineties of the last century, very few
data about cosmogenic isotopes production rates have been published up to date.
In this work we present data from two 12.5 kg NaI(Tl) detectors, developed in
the frame of the ANAIS project, which were installed inside a convenient
shielding at the Canfranc Underground Laboratory just after finishing surface
exposure to cosmic rays. The very fast start of data taking allowed to identify
and quantify isotopes with half-lives of the order of tens of days. Initial
activities underground have been measured and then production rates at sea
level have been estimated following the history of detectors; values of about a
few tens of nuclei per kg and day for Te isotopes and 22Na and of a few
hundreds for I isotopes have been found. These are the first direct estimates
of production rates of cosmogenic nuclides in NaI crystals. A comparison of the
so deduced rates with calculations using typical cosmic neutron flux at sea
level and a carefully selected description of excitation functions will be also
presented. | | Source: | arXiv, 1411.0106 | | Services: | Forum | Review | PDF | Favorites | |
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